this was great. thanks so much. Very much what we needed. if anyone is interested, I have typed up the steps here. Hopefully everything is right. Changing Impellor RUclips: ruclips.net/video/IX9A-_zNobQ/видео.html Tools: 16 mm crescent wrench and socket wrench 0.5 inch socket Flathead (small one) Oil collecting bucket and pump Petroleum oil grease SAE 80W - 90 gear oil (about 1.5 quarts) Impellor and gasket MerCruiser Water Pump Impeller Kit, Alpha 1 - GEN 2 - EMP Replaces- 18-3214, 47-43026Q06 1. Place boat in neutral. 2. With 16 mm wrenches, remove 3 of the bolts on the side of the prop. Leave one on. 3. Remove bolt in back with 0.5 inch socket 4. Remove pewter silver plate in the front with 0.5 inch socket 5. Remove bolt that was under pewter plate with 9/16 socket 6. Remove speedometer line 7. Remove bottom drain plug for transmission fluid (have bucket under to collect). Remove top plug. 8. Loosen last side bolt (but leave enough on to catch the prop) 9. Separate the lower prop from the top 10. Remove last bolt 11. Remove lower prop 12. Remove screws for impellor housing with 5/16 or 8mm socket (2:55) 13. Open up impellor housing and scrape off the gunk 14. Replace the silver plate and the lock (4:17) 15. Lightly lubricate fins of impellor with petroleum oil grease 16. Put the impellor on (lined up with lock) 17. Lightly lubricate top housing of impellor. Add new gasket 18. Rotate the shaft clockwise to help put upper housing down on impellor. 19. Bolt in the housing 20. Place the boat in full forward position 6:15 21. Replace the bottom prop housing. Line up the tube (have it on the bottom housing). Line up the silver L shaped rod with the notch it fits in (7:00). Turn it so that when you move the prop blades, the shaft turns. You can turn the prop blades whichever way you want to. 22. Replace 4 side bolts (16mm). Replace bolt under pewter plate (9/16). Replace pewter plate (0.5 inch). Replace rubber plug over this bolt. Replace back bolt (0.5 inch) 23. Replace speedometer line 24. Lower prop 9:31 25. Connect pump to bottom transmission oil screw. Add gear oil 26. Pump until oil starts leaking out of top vent. 27. Screw in top vent screw (smaller one). Remove oil pump and screw in bottom screw (larger) 28. Fill gear oil reservoir in engine compartment. You should be able to spin the prop while boat is off (no clicking, not much resistance). In forward, the prop should spin one direction and click the other direction. When boat is on in neutral the prop may slowly move, but not spin. In forward, spins clockwise, in reverse spins counterclockwise. Water should not shoot out middle of prop with bunny ears on.
Jonathan Boyle Thank you for the written step-by-step guide. I'm sure it will help someone with their impeller replacement. We get many boats that come in for the same thing, but I don't record a lot of them because the steps are pretty much the same. I do however want to upload videos on how to clean out the carburetors.. I'm sure someone can find use for a video like that. 😁👍
The impeller is one of 3 parts that gives the engine its life(4 if you count air). Theres fuel, spark, and there's water. You can't run a healthy engine (or at all) without even one of these. We replace these impellers when the boat has been sitting for a while without use. Mainly because the rubber tends to dry out with time, and when you want to start your engine, the rubber can potentially break apart and not only overheat your engine, but the pieces of rubber can flow up into the engine block and plug the water ports. We usually have them checked/ replaced at least once a year. Sometimes people start their engine without water and melt the impeller and housing cover. It takes less than 15 minutes to drop your lower unit, and put it back together again. Couldn't hurt to check how things are running down there.. even twice a year sounds better. Not only cuz of dry rot, but maybe a faulty impeller. Hope it helped!
That gear oil that was drained out early in the video was definitely a milky color...that's a sign of water getting into the gear oil which is not good. Could be a bad seal somewhere. Great video though, I just replaced the impeller on my Mercruiser 3.0 Alpha One Gen II engine and it should be good to go for the next several years. It's undoubtedly easier when you have a helper around when reinstalling the lower.
I was going to beat you up on your tools. But by the end of the video, I could say that you are one of the best as explaining a simple process. I almost want to send you a set of rachet wrenches.
Thank you for this great video!! You are the only one in the net completely showing how to fix the tube when replacing the drive! I once had to repeat the whole work (without someone helping me) because the tube slipped off without me noticing it. Perhaps just one small hint missing: I usually put in gear in forward position when taking off the drive, then it is way easier to align the drive when putting everything together again. In neutral position it is almost impossible (at least for me)
I just started working on my own boat opposed to paying someone to do it for me. Your video was extremely helpful and so easy to follow on changing my impeller. Thank you!!!!!
Old video but for those that don't know any better there is water in that oil which means a seal or seals are leaking. Pressure test and use soapy water in a spray bottle to find the leaks. Replace the leaking seals and pressure test again to make sure it is fixed. If you can put 10psi on the outdrive and it hold for 10-20 minutes without dropping your good to go.
Nice job, but your oil you changed had water in it. Plus and it maybe just a latitude thing, here on the east coast . You are working on a Stern drive not an Inboard.
Just an FYI this is not an inboard this is a sterndrive or inboard outboard. An inboard has a drive shaft that comes through the bottom of the hull going to a propeller that has a Rudder behind it. Other than that good video on how to do this.
Just saw this. Very nicely done and very complete. I especially liked the fact you used hand tools and didnt have power tool everything. The Sound and your narration was excellent.
It appears you had Merc's original gear lube and replaced it with the incorrect type? The gear lube should be bluish green like what came out of the vent at first, before you see it turn golden, like your new oil?
Thank you for this video, esta chingon, its the best I have seen, your photography is great. good explanation. this is what i am trying to do for 2 days, but when i try to connect the lower unit, the shaft won´t slide up. it hits metal. have my gear it forward. i notice you are moving the shift stick in the back, is that so it will slide up ??? because i know its suppose to be straight, it pulls to the right, what is the secret ? also, i saw a man say to his helper to move the propeller. confused Pete, thank you. Gracias tecnico. por favor dime como le hago.??? what city are you in.?? another question, water was not going up to the engine, i disconnected the hose in the thermostat, and no water. so I thought its the water pump. but also could be its clogged, how can I find out which. thank you
+elimonjal at the back of the trans, you have to hold the gear shaft aligned when you are sitting it in. It can also help to rotate the propeller while you're pushing the lower unit in place. The water pump is usually serviced once a year if used regularly.. if you don't use your boat often, the rubber trends to dry which gives you problems. It might be a stuck thermostat, but I wouldn't run the engine for long if water isn't passing by... keep in touch, I'll try help as best as I can.
When you tell the size of the Sockets it makes the job a lot easier so you don't have to keep running back yo the garage trying different sizes. Great video
Fantastic video. But aren’t our units required to use “High Performance” gear oil? And the manual says not to mix HighPerformance oil with “Premium”? 🇨🇦
Not a big deal as long as it has the appropriate GL5 rating, 80/90 is fine. Some have additives for marine but it's not required. I change mine annually.
Here are some tabs to help you navigate through the video. 0:00 Removing Lower Unit 2:55 Removing Impeller 4:17 Installing Impeller 6:13 Installing Lower Unit 9:30 Adding Oil 12:16 Tools / Recap
How you doing man I have a did pretty much everything what you said on the video and I left the throttle and gear but then when I put everything back together the throttle was loose and It wouldn't go nowhere
enrique madrigal do you mean you have throttle response, but your transmission won't engage into gear? If so, you may have not put the gear shaft in properly. Somewhere around 7:00 you'll notice I put my hand behind the transmission, that's to align the shaft before sitting the trans in place. Also check 9:20 for a closer view.
Where's the seal on top of the water pump housing? It's purpose is to deflect exhaust gasses without it the engine can overheat at idle plus the gear oil is milky
Excellent video! You guys do it right so even a layman can understand-thank you so much! I have one question if you don’t mind I just started up my 350 magnum Chevy with a Alpha one for the first time in 5 years, although it was stored inside and had been put to sleep with a proper winterization with oil and filter change and lower unit change and antifreeze by the mercury dealer, and I siphoned and replaced all the gas with fresh and new fuel filter before starting, and it fired right up and sounded great! I was concerned because I only noticed water coming out of the left exhaust port and its an eight cylinder and from watching your video it should have come out of both right and left exhaust ports if I understood you correctly, that only the 4 cylinders just have the one port water exit? I only ran it for a few minutes because I was suspicious of a possible impeller problem or water blockage in the system somewhere and was by myself so couldn’t monitor gauges and water output very long jumping back-and-forth in and out of the boat to see what I could notice do you think I need to run it longer and see if the right port kicked in or just pull lower unit and replace the impeller like you did to play it safe? Thanks for your help and this great video! Dave
Actually this is known as an inboard-outboard or I/O. As long as you can easily pull the boat out of the water, it’s easy as shown. Inboards, V- drive and direct drives Mercrusiers can have on-engine water pumps that are some of the most difficult to work on in the industry. This is because in their infinite wisdom they choose to locate the pump low or under the engine. Since impeller change should be an annual on big blocks and every two on small, I have retrofitted some to end crank pulley mount when the engine room is tight like in a Sea Ray. Save pain(me)and money for the owner.
Hello Friend! I have a problem with a motor like that in the boat, an alarm goes off when I turn it on and then the motor turns off, could you please help me by giving me a guide to what the problem may be. Thank you
This is a great video, we appreciate the education. we have a 98 Maxum 1900 sr2 thats been sitting for awhile, not sure if im going to need to replace the impeller. but this video will help. Thanks
All I can say, is I watch a lot of videos on a myriad of topics. this is one of the most informative easiest to follow videos I've watched yet. Yes I am going to subscribe and follow. literally one of the very first videos I've watched where I felt like I could do it when I was done watching. Thank you guys
Thank you for the wonderful video GT Performance. I recently got a used boat and tested it in water with no issues. However when I further examined the outdrive it appears the exhaust bellow is missing. But no water enters the boat. I noticed this when I put the trip WAY up. Would appreciate some feedback / input as to if I'm stupid taking the boat in the water without the exhaust bellow, or is it ok (assuming no water is enter the boat. Thanks in advance!
Personally, I feel the gasket surfaces were poorly prepared, and I don’t think cleaning them with metal objects that scratch the sealing surface is a good idea at all. Also no control on torques. Never use an impact driver for torquing up.
Wow! be careful about using this guys advice. One is to use dish soap instead of grease to lube the impeller. Most grease will attack the impeller material and some are even water resistant. The seal was left off of the drive shaft. It doesn't look like he replaced the lower gasket under the wear plate. This is a known problem area for high speed over heats. I would also recommend greasing the mounting surface to help prevent corrosion. It works better than paint if using the correct type of grease. The Mercury Extreme Grease I have found to be excellent for this and lubricating purposes.
The reason the gear oil is full of water is the black rubber "face seal" is missing from where the drive shaft enters the top of the pump housing. Why didn't you install one after reassembly? The face seal is there to prevent pump water from entering the upper unit where the shaft comes out.
Hey bro was wondering if you could help me identify a couple of plates that fell out of my lower end, I just uploaded a video if you could help me out I'd appreciate it thank you
Great video you make it look easy! Where did you get the pump to put the gear oil back in the tranny? I have everything to do the job. I have a 3.0 TKS Mercruiser and it running hot. I replaced the thermostat with a 160 degree but the engine gets hot about 180 degrees with the Mickey Mouse water supply ears on. Gould there be some blockage in the water supply to cool the engine or perhaps the impeller needs replacing? Any tips on diagnosis of the issue? I got a laser temp gun to see if maybe my temp gauge on the boat is off. I don’t want to damage the engine and my understanding is that there is a warning system if it does get too hot is that correct? Thanks for your help it seems like you really know what you’re doing I really liked your video
Great video man. Very detailed and good camera action to see every part of the removal and install. Question; is there a diference in install if it's a bigger engine? I have a Mercruiser 5.0
Compa buenas tardes yo tengo un volvo penta 270 pero cuando lo prendo no se mueve ni para adelante ni asea tras no sabes si sea el chicote de el aselerador u otra cosa
Your said it's been sitting for 8years that's almost a guarantee that the upper seal is going to leak and you should of put the top plug on and kept filling until fluid starts to enter bottle to purge air out of system
if u r going to do a video ,as u did then call it what it is not mercury thats a outbord, mercruiser is what u have and its a io not inbord , can u tell me whats io stand 4
A great video but pump the brakes. STOP! It is not necessarily true that you rotate the shaft clockwise. I know for a "FACT" that our Merc 3.0 Alpha One lower unit, Which looks exactly like this unit, rotates COUNTER clockwise!! If you install the impeller with the vanes of the impeller rotating in the wrong direction it will not pump and you will overheat the motor. The only way to truly know which way to install the impeller is to take a picture before you remove it or better yet, put the lower unit in gear when its off and put the shift lever in drive. As you rotate the prop as if the boat was moving forward, take notice which way the shaft rotates. This will ensure you have the vanes in the right direction when you install the cover. Trust me I have made this very mistake!!
At exactly 1 minute into the video you showed a close-up of the bolt closest to the stern. THANKS! That bolt would not budge and got stripped for me. I tried PB Blaster for a week - nothing worked. I thought about torching it, but the plastic piece behind it would melt causing yet another problem. By showing that bolt, I was 100% that there were no threads on the upper drive. The top 1/4 inch or so has no threads - yea! So, I cut the head of the bolt off with a rotozip and got the lower drive off. My only complaint is that you should coat EVERY Bolt that goes under water with Anti-Seize. Every boat shop should do this. If this had been done on my lower unit, I never would have had this problem.
😂😂 the engine stops and starts rotating counter-clockwise. J/k The lower unit has gears called "clutch dog" which is basically acts like a transmission. When it's in forward gear, it turns one way.. slide it into reverse, turns opposite.
Chaparral 246 oil showed 0 pressure but oil level was good Do you think it is just the sensor? Oil Pressure Sensor Sender Switch 3852215 for Volvo Penta 4.3 5.0 5.7 V6 V8 Thanks Jeff
I also have an external oil tank for the gears, it's leaking somewhere but don't see any oil leak on the floor, though when it's in the water i see oil rainbow slick. Any common place where to look? Thanks
Just bought a used boat with the lower unit removed. Seller had a new seal kit that he gave me. Out of precaution and hassle free use, should I replace the universal joints along with the impeller? Also, is there anything that makes sense to replace when you don’t know the service history of the drive unit like the main bearing on/in the transom plate.
Hey guys thanks for the video, never knew about all that. I am wondering if that impeller fits all models or is it unique to that certain model? I am trying to find out where to get the parts for mine. Thanks, I am new to boating aswell.
You are the man! Thank you so much great video i watched a couple others before attempting this yours was by far the best! Saved me a lot of $$$$$ and grief!!
I have a Mercrusier 3.0 liter inboard/outboard similar to the one in the video. I was pulling a tuber when the engine seemed to lose power. It seemed like there was a vibration as I slowly took the boat to shore. What could the problem be?
When I was replacing my impeller a little metal plate fell out with 5 holes in it. Any help to what it is and where it goes would be very helpful. Thanks in advance.
Agradecido del video instrucctivo mi querido Chamo! Mi viejo bote (1989) tiene ha estado parado desde finales del 2020 por la bendita pandemia. Despues de conseguir los engine plugs del 4.3 Mercruiser (no me acuerdo donde los puse) creo que voy a intentar cambiar el impeller siguiendo tu video. En ese verano Canadiense el bote se uso muy poco y no estoy seguro de que necesite meterme en esa aventura del cambio de impeller. Antes lo hacia un amigo mecanico, pero nos mudamos por lados solitarios donde solo hay monte y culebras como diriamos en Venezuela. Favor tu consejo al respecto. Gran abrazo.
Mi hermano gracias por este video esta BUENISIMO tengo una pregunta: mi bote liqueo el aceite por la parte de atras (en donde pusiste el ultimo tornillo) que crees que sea?? ojala y me pudieras contestar GRACIAS MIL
As a business, we only replace what the customer wants. We can only recommend or give them suggestions to replace certain parts.. We have had times where we go above and beyond, only to have non paying customers cuz that's not what they asked. 🤷🏻♂️ Doesn't take a good eye to notice there's water in the oil,.. we noticed too!
this was great. thanks so much. Very much what we needed. if anyone is interested, I have typed up the steps here. Hopefully everything is right.
Changing Impellor
RUclips: ruclips.net/video/IX9A-_zNobQ/видео.html
Tools:
16 mm crescent wrench and socket wrench
0.5 inch socket
Flathead (small one)
Oil collecting bucket and pump
Petroleum oil grease
SAE 80W - 90 gear oil (about 1.5 quarts)
Impellor and gasket MerCruiser Water Pump Impeller Kit, Alpha 1 - GEN 2 - EMP Replaces- 18-3214, 47-43026Q06
1. Place boat in neutral.
2. With 16 mm wrenches, remove 3 of the bolts on the side of the prop. Leave one on.
3. Remove bolt in back with 0.5 inch socket
4. Remove pewter silver plate in the front with 0.5 inch socket
5. Remove bolt that was under pewter plate with 9/16 socket
6. Remove speedometer line
7. Remove bottom drain plug for transmission fluid (have bucket under to collect). Remove top plug.
8. Loosen last side bolt (but leave enough on to catch the prop)
9. Separate the lower prop from the top
10. Remove last bolt
11. Remove lower prop
12. Remove screws for impellor housing with 5/16 or 8mm socket (2:55)
13. Open up impellor housing and scrape off the gunk
14. Replace the silver plate and the lock (4:17)
15. Lightly lubricate fins of impellor with petroleum oil grease
16. Put the impellor on (lined up with lock)
17. Lightly lubricate top housing of impellor. Add new gasket
18. Rotate the shaft clockwise to help put upper housing down on impellor.
19. Bolt in the housing
20. Place the boat in full forward position 6:15
21. Replace the bottom prop housing. Line up the tube (have it on the bottom housing). Line up the silver L shaped rod with the notch it fits in (7:00). Turn it so that when you move the prop blades, the shaft turns. You can turn the prop blades whichever way you want to.
22. Replace 4 side bolts (16mm). Replace bolt under pewter plate (9/16). Replace pewter plate (0.5 inch). Replace rubber plug over this bolt. Replace back bolt (0.5 inch)
23. Replace speedometer line
24. Lower prop 9:31
25. Connect pump to bottom transmission oil screw. Add gear oil
26. Pump until oil starts leaking out of top vent.
27. Screw in top vent screw (smaller one). Remove oil pump and screw in bottom screw (larger)
28. Fill gear oil reservoir in engine compartment.
You should be able to spin the prop while boat is off (no clicking, not much resistance). In forward, the prop should spin one direction and click the other direction. When boat is on in neutral the prop may slowly move, but not spin. In forward, spins clockwise, in reverse spins counterclockwise. Water should not shoot out middle of prop with bunny ears on.
Jonathan Boyle Thank you for the written step-by-step guide. I'm sure it will help someone with their impeller replacement. We get many boats that come in for the same thing, but I don't record a lot of them because the steps are pretty much the same. I do however want to upload videos on how to clean out the carburetors.. I'm sure someone can find use for a video like that. 😁👍
Sorry for the stupid question, but why replace the impeller? Is this something you should do frequently. I’m new to boating
The impeller is one of 3 parts that gives the engine its life(4 if you count air). Theres fuel, spark, and there's water. You can't run a healthy engine (or at all) without even one of these.
We replace these impellers when the boat has been sitting for a while without use. Mainly because the rubber tends to dry out with time, and when you want to start your engine, the rubber can potentially break apart and not only overheat your engine, but the pieces of rubber can flow up into the engine block and plug the water ports. We usually have them checked/ replaced at least once a year. Sometimes people start their engine without water and melt the impeller and housing cover.
It takes less than 15 minutes to drop your lower unit, and put it back together again.
Couldn't hurt to check how things are running down there.. even twice a year sounds better. Not only cuz of dry rot, but maybe a faulty impeller.
Hope it helped!
GT's Performance I for one, would find a carb-cleaning video VERY helpful if you ever make one. 👍🏼🇨🇦
Great
That gear oil that was drained out early in the video was definitely a milky color...that's a sign of water getting into the gear oil which is not good. Could be a bad seal somewhere. Great video though, I just replaced the impeller on my Mercruiser 3.0 Alpha One Gen II engine and it should be good to go for the next several years. It's undoubtedly easier when you have a helper around when reinstalling the lower.
I was going to beat you up on your tools. But by the end of the video, I could say that you are one of the best as explaining a simple process. I almost want to send you a set of rachet wrenches.
Thank you for this great video!! You are the only one in the net completely showing how to fix the tube when replacing the drive! I once had to repeat the whole work (without someone helping me) because the tube slipped off without me noticing it.
Perhaps just one small hint missing: I usually put in gear in forward position when taking off the drive, then it is way easier to align the drive when putting everything together again. In neutral position it is almost impossible (at least for me)
Damn....you good! very thorough and fast...you have obviously completed a few rebuilds.
Thanks, easy to follow directions i will be doing mine now. from know on instead of paying a shop. Save me money in the future
Great video. Short, sweet, direct and accurate. Thank you
I just started working on my own boat opposed to paying someone to do it for me. Your video was extremely helpful and so easy to follow on changing my impeller. Thank you!!!!!
Old video but for those that don't know any better there is water in that oil which means a seal or seals are leaking. Pressure test and use soapy water in a spray bottle to find the leaks. Replace the leaking seals and pressure test again to make sure it is fixed. If you can put 10psi on the outdrive and it hold for 10-20 minutes without dropping your good to go.
Great video! I could sure use some of those gasket removal pliers too!
Great video, straight to the point . Thanks
thank you for sharing this very useful information
Nice job, but your oil you changed had water in it.
Plus and it maybe just a latitude thing, here on the east coast . You are working on a Stern drive not an Inboard.
Noticed the water also! New impeller isnthe least of his worries
Just an FYI this is not an inboard this is a sterndrive or inboard outboard. An inboard has a drive shaft that comes through the bottom of the hull going to a propeller that has a Rudder behind it. Other than that good video on how to do this.
Just saw this. Very nicely done and very complete. I especially liked the fact you used hand tools and didnt have power tool everything. The Sound and your narration was excellent.
This is one of the best instructional videos.....NO extra talking, and vlogging. Just information and a clear way to do it. Thank you!
except that he forgot an important seal.
It appears you had Merc's original gear lube and replaced it with the incorrect type? The gear lube should be bluish green like what came out of the vent at first, before you see it turn golden, like your new oil?
never mentioned about not putting it in forward first so the shifter would go in forward and reverse gears
Great How 2 Video, Thank You
That impeller was still good
Thank you for this video, esta chingon, its the best I have seen, your photography is great. good explanation. this is what i am trying to do for 2 days, but when i try to connect the lower unit, the shaft won´t slide up. it hits metal. have my gear it forward. i notice you are moving the shift stick in the back, is that so it will slide up ??? because i know its suppose to be straight, it pulls to the right, what is the secret ? also, i saw a man say to his helper to move the propeller. confused Pete, thank you. Gracias tecnico. por favor dime como le hago.??? what city are you in.?? another question, water was not going up to the engine, i disconnected the hose in the thermostat, and no water. so I thought its the water pump. but also could be its clogged, how can I find out which. thank you
+elimonjal at the back of the trans, you have to hold the gear shaft aligned when you are sitting it in. It can also help to rotate the propeller while you're pushing the lower unit in place. The water pump is usually serviced once a year if used regularly.. if you don't use your boat often, the rubber trends to dry which gives you problems. It might be a stuck thermostat, but I wouldn't run the engine for long if water isn't passing by... keep in touch, I'll try help as best as I can.
I've read that after you plug the vent screw, you should keep pumping until your reservoir is at the right level. That pushes all the air out
yea do that and you'll blow out your front seal on your outdrive. Just top it off with a quart of oil.
When you tell the size of the Sockets it makes the job a lot easier so you don't have to keep running back yo the garage trying different sizes. Great video
socket rack.
Very good video! Thanks
Fantastic video. But aren’t our units required to use “High Performance” gear oil? And the manual says not to mix HighPerformance oil with “Premium”? 🇨🇦
Not a big deal as long as it has the appropriate GL5 rating, 80/90 is fine. Some have additives for marine but it's not required. I change mine annually.
Quality video, thanks
Could not have been shown any better, THANK YOU !!
excellent video ,one question ,in neutral or in drive ,when you pull lower unit down. thanks .
I swear it looks like the lube oil drained from the lower unit is milky white, water leaking through seals?
Water for sure. I don't think he knows what his talking about!! How can he not mention that the outdrive oil is fucked
yeap seen that before on my outboard, to late to save new outboard was ordered
There was no seal on the top of impeller housing.. He didn't put one on it either so yeah going to be fill with water again.. What a waste..
Same as the flow vent when filling it.
Good eye
@@dragonz868 good observation...
Do you always lose gear oil when doing this or you just do both at the same time ?
Thanks for the video man. It covered everything I needed to know for my impeller change. Good job.
thank you, I'm glad it helped! any further assistance, just ask. 👍
How much is a job like that cost? My boat is a omc cobra 3.0 engine same I replaced the water pump and thermostat and it’s overheating
Nice video. I recommend showing the oil seal replacement between the upper and lower halves. DIY guys may miss it.
Yes, I almost missed that one. The rebuild kit came with that o-ring, so I knew it had to go somewhere.
Inboard? That’s a sterndrive. You could call it an onboard/outboard if you want, but an inboard is quite different.
@ yea,not an inboard.
An inboard, huh??
Nice just seeing people take the time to try and help another person out. Good job!
WWG1WGA the way OUR family does it!!!
Great video, informative without the BS!
Did you put in forward gear , neutral, or reverse before you pulled the lower unit off?
Wow. The guy at the shop made this sound like a much bigger job than it really is. Typical boat shop.
As a fellow RUclipsr, I want to congratulate you on an excellent video!!! Thanks for filming this and keeping it interesting. :)
Do you have to drain the gear lube out? I just changed it
Great video ,thanks
Here are some tabs to help you navigate through the video.
0:00 Removing Lower Unit
2:55 Removing Impeller
4:17 Installing Impeller
6:13 Installing Lower Unit
9:30 Adding Oil
12:16 Tools / Recap
How you doing man I have a did pretty much everything what you said on the video and I left the throttle and gear but then when I put everything back together the throttle was loose and It wouldn't go nowhere
enrique madrigal do you mean you have throttle response, but your transmission won't engage into gear? If so, you may have not put the gear shaft in properly. Somewhere around 7:00 you'll notice I put my hand behind the transmission, that's to align the shaft before sitting the trans in place. Also check 9:20 for a closer view.
Where's the seal on top of the water pump housing? It's purpose is to deflect exhaust gasses without it the engine can overheat at idle plus the gear oil is milky
Excellent video! You guys do it right so even a layman can understand-thank you so much! I have one question if you don’t mind I just started up my 350 magnum Chevy with a Alpha one for the first time in 5 years, although it was stored inside and had been put to sleep with a proper winterization with oil and filter change and lower unit change and antifreeze by the mercury dealer, and I siphoned and replaced all the gas with fresh and new fuel filter before starting, and it fired right up and sounded great! I was concerned because I only noticed water coming out of the left exhaust port and its an eight cylinder and from watching your video it should have come out of both right and left exhaust ports if I understood you correctly, that only the 4 cylinders just have the one port water exit? I only ran it for a few minutes because I was suspicious of a possible impeller problem or water blockage in the system somewhere and was by myself so couldn’t monitor gauges and water output very long jumping back-and-forth in and out of the boat to see what I could notice do you think I need to run it longer and see if the right port kicked in or just pull lower unit and replace the impeller like you did to play it safe? Thanks for your help and this great video!
Dave
Actually this is known as an inboard-outboard or I/O. As long as you can easily pull the boat out of the water, it’s easy as shown. Inboards, V- drive and direct drives Mercrusiers can have on-engine water pumps that are some of the most difficult to work on in the industry. This is because in their infinite wisdom they choose to locate the pump low or under the engine. Since impeller change should be an annual on big blocks and every two on small, I have retrofitted some to end crank pulley mount when the engine room is tight like in a Sea Ray. Save pain(me)and money for the owner.
that's what happens when you hire an engineer instead of a mechanic to design a boat
Hello Friend! I have a problem with a motor like that in the boat, an alarm goes off when I turn it on and then the motor turns off, could you please help me by giving me a guide to what the problem may be. Thank you
This is a great video, we appreciate the education. we have a 98 Maxum 1900 sr2 thats been sitting for awhile, not sure if im going to need to replace the impeller. but this video will help. Thanks
Great stuff
That was awesome thanks
All I can say, is I watch a lot of videos on a myriad of topics. this is one of the most informative easiest to follow videos I've watched yet. Yes I am going to subscribe and follow. literally one of the very first videos I've watched where I felt like I could do it when I was done watching. Thank you guys
I wished I’d saw your video 1st. Straight to the point. Great video for us diy’ers.
Thank you for the wonderful video GT Performance. I recently got a used boat and tested it in water with no issues. However when I further examined the outdrive it appears the exhaust bellow is missing. But no water enters the boat. I noticed this when I put the trip WAY up. Would appreciate some feedback / input as to if I'm stupid taking the boat in the water without the exhaust bellow, or is it ok (assuming no water is enter the boat. Thanks in advance!
Do you have to put forward gear before removing?
Muchas gracias, muy buen video 🤘👌
great video thanks, I wonder if the lube 80-90W is of the same blue quick silver that we normally know?
A good quality 80w-90 may not be exactly the same but will work just fine
Although I'm sure the video is great for changing an impeller on an OUTDRIVE, no one in this video is changing an impeller on an INBOARD!
Great video....nicely explained and demonstrated Thank you for sharing
Personally, I feel the gasket surfaces were poorly prepared, and I don’t think cleaning them with metal objects that scratch the sealing surface is a good idea at all. Also no control on torques. Never use an impact driver for torquing up.
Wow! be careful about using this guys advice. One is to use dish soap instead of grease to lube the impeller. Most grease will attack the impeller material and some are even water resistant. The seal was left off of the drive shaft. It doesn't look like he replaced the lower gasket under the wear plate. This is a known problem area for high speed over heats. I would also recommend greasing the mounting surface to help prevent corrosion. It works better than paint if using the correct type of grease. The Mercury Extreme Grease I have found to be excellent for this and lubricating purposes.
how often should the impeller be replaced sorry i know this an old video
I need some advice please so I need to talk to some that knows more about boat motors I am dealing with a mericruiser alpha 4.3 on an 2011 Tahoe Q5i
The reason the gear oil is full of water is the black rubber "face seal" is missing from where the drive shaft enters the top of the pump housing. Why didn't you install one after reassembly? The face seal is there to prevent pump water from entering the upper unit where the shaft comes out.
Hey, good job on the instruction bro. Thanks!!!!
Hey bro was wondering if you could help me identify a couple of plates that fell out of my lower end, I just uploaded a video if you could help me out I'd appreciate it thank you
I believe you're missing your shaft seal, and I'm guessing that's why you had so much water in your lube oil.
The grease is White Lithium. Water soluble so it washes out and doesn’t contaminate after it’s done it’s job lubricating the parts for installation.
Great video. I have seen some people say that the transmission should be in the forward position while putting it back together?
Great video you make it look easy! Where did you get the pump to put the gear oil back in the tranny? I have everything to do the job. I have a 3.0 TKS Mercruiser and it running hot. I replaced the thermostat with a 160 degree but the engine gets hot about 180 degrees with the Mickey Mouse water supply ears on. Gould there be some blockage in the water supply to cool the engine or perhaps the impeller needs replacing? Any tips on diagnosis of the issue? I got a laser temp gun to see if maybe my temp gauge on the boat is off. I don’t want to damage the engine and my understanding is that there is a warning system if it does get too hot is that correct? Thanks for your help it seems like you really know what you’re doing I really liked your video
Is it just me??...or was that gear oil a bit creamy looking coming out of that outdrive??
Great video man. Very detailed and good camera action to see every part of the removal and install. Question; is there a diference in install if it's a bigger engine? I have a Mercruiser 5.0
The tube should it be on the lower part or up inside when installing ?
I wasn’t sure, and you didn’t clarify ?
nice , thanks
Thanks my guy. Watched other videos and they either talk too much and bounce around or didn't go into detail.
Compa buenas tardes yo tengo un volvo penta 270 pero cuando lo prendo no se mueve ni para adelante ni asea tras no sabes si sea el chicote de el aselerador u otra cosa
Your said it's been sitting for 8years that's almost a guarantee that the upper seal is going to leak and you should of put the top plug on and kept filling until fluid starts to enter bottle to purge air out of system
Oh it’s a 1992 by the way Alpha one with a Chevy 350 Motor
if u r going to do a video ,as u did then call it what it is not mercury thats a outbord, mercruiser is what u have and its a io not inbord , can u tell me whats io stand 4
A great video but pump the brakes. STOP! It is not necessarily true that you rotate the shaft clockwise. I know for a "FACT" that our Merc 3.0 Alpha One lower unit, Which looks exactly like this unit, rotates COUNTER clockwise!! If you install the impeller with the vanes of the impeller rotating in the wrong direction it will not pump and you will overheat the motor. The only way to truly know which way to install the impeller is to take a picture before you remove it or better yet, put the lower unit in gear when its off and put the shift lever in drive. As you rotate the prop as if the boat was moving forward, take notice which way the shaft rotates. This will ensure you have the vanes in the right direction when you install the cover. Trust me I have made this very mistake!!
At exactly 1 minute into the video you showed a close-up of the bolt closest to the stern. THANKS! That bolt would not budge and got stripped for me. I tried PB Blaster for a week - nothing worked. I thought about torching it, but the plastic piece behind it would melt causing yet another problem. By showing that bolt, I was 100% that there were no threads on the upper drive. The top 1/4 inch or so has no threads - yea! So, I cut the head of the bolt off with a rotozip and got the lower drive off. My only complaint is that you should coat EVERY Bolt that goes under water with Anti-Seize. Every boat shop should do this. If this had been done on my lower unit, I never would have had this problem.
the speedometer hose ! That is the part I couldn't understand. Thank you ! Good job !
Always rotate clockwise.... what happens when you put he boat in reverse? Great tutorial by the way. Thank you.
😂😂 the engine stops and starts rotating counter-clockwise. J/k
The lower unit has gears called "clutch dog" which is basically acts like a transmission. When it's in forward gear, it turns one way.. slide it into reverse, turns opposite.
Shit for brains
Chaparral 246 oil showed 0 pressure but oil level was good Do you think it is just the sensor? Oil Pressure Sensor Sender Switch 3852215 for Volvo Penta 4.3 5.0 5.7 V6 V8
Thanks Jeff
I also have an external oil tank for the gears, it's leaking somewhere but don't see any oil leak on the floor, though when it's in the water i see oil rainbow slick. Any common place where to look? Thanks
Good video. Very nice job of explaining how to change out the impeller and Gear Lube on a Mercruiser Inboard / Outboard. Nice job!
How would i know if the impeller needs replacing?
Just bought a used boat with the lower unit removed. Seller had a new seal kit that he gave me. Out of precaution and hassle free use, should I replace the universal joints along with the impeller? Also, is there anything that makes sense to replace when you don’t know the service history of the drive unit like the main bearing on/in the transom plate.
Inboard outboard, not inboard.
Are you supposed to put it in gear before removing out drive ....
I didn’t and now the prop spins in Neutral any clue on what I should do
Hey guys thanks for the video, never knew about all that. I am wondering if that impeller fits all models or is it unique to that certain model? I am trying to find out where to get the parts for mine. Thanks, I am new to boating aswell.
You are the man! Thank you so much great video i watched a couple others before attempting this yours was by far the best! Saved me a lot of $$$$$ and grief!!
I have a Mercrusier 3.0 liter inboard/outboard similar to the one in the video. I was pulling a tuber when the engine seemed to lose power. It seemed like there was a vibration as I slowly took the boat to shore. What could the problem be?
Absolutely great instructional video keep up the good work. 👍
When I was replacing my impeller a little metal plate fell out with 5 holes in it. Any help to what it is and where it goes would be very helpful. Thanks in advance.
Use a wire brush or light grit sand paper so your Mating surfaces are clean because if not your oil is going to look like his !!!! Milky 🥛
Agradecido del video instrucctivo mi querido Chamo! Mi viejo bote (1989) tiene ha estado parado desde finales del 2020 por la bendita pandemia. Despues de conseguir los engine plugs del 4.3 Mercruiser (no me acuerdo donde los puse) creo que voy a intentar cambiar el impeller siguiendo tu video.
En ese verano Canadiense el bote se uso muy poco y no estoy seguro de que necesite meterme en esa aventura del cambio de impeller.
Antes lo hacia un amigo mecanico, pero nos mudamos por lados solitarios donde solo hay monte y culebras como diriamos en Venezuela. Favor tu consejo al respecto. Gran abrazo.
Dont criticize this guy for his video, Make your own. The video wasminformative
Mi hermano gracias por este video esta BUENISIMO tengo una pregunta: mi bote liqueo el aceite por la parte de atras (en donde pusiste el ultimo tornillo) que crees que sea?? ojala y me pudieras contestar GRACIAS MIL
It's a lower unit not a transmission lol
Great Video Bro 👍🏼👏🏼👏🏼👏🏼👊🏼🇻🇪
So you should have replaced the seals in your prop hub. The oil you drained was like milk and there was also quite a bit of water too.
As a business, we only replace what the customer wants. We can only recommend or give them suggestions to replace certain parts..
We have had times where we go above and beyond, only to have non paying customers cuz that's not what they asked. 🤷🏻♂️
Doesn't take a good eye to notice there's water in the oil,.. we noticed too!