Mercury Outboard V6 Overheating pt2: clogs? impeller? poppet valve?
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- Опубликовано: 29 сен 2024
- Part 2 of the overheating issues I have been having with the V6. Slightly regretting the V6 after only having it for 1 year. Can I get the temp down to operable level? What other issues will follow. My heart is genuinely towards L6's..... Will this be the V that proves me correct?!?!?! Watch to find out..... I am still wondering in the back of my head how long this will last. Compression is 110psi on all cylinders which does not give me a lot of "room" to play around with. As always, Thank you for watching and your support. I am just sharing my experiences as I progress through the many Mercury Outboard stages! Son
Thermostats used:
amzn.to/3OFvrxE
impeller used:
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Might not have been the impeller. Could also have been your gasket stack. If you had one wrong paper gasket or put one upside down or bottom gasket on top or vice versa, it can cause the exact problems you were having. Literally went through the exact problem you were have last month when I figured it out.
I'll keep that in mind my friend. Thank you. Son
I bet the bad thermostats overworked the impeller, causing it to fail. Then, after replacing the thermostats. The water circulates with left restruction..
one note for the plastic bin water tank method - use 3 bins stacked one inside another and the rims together will be rigid enough to prevent the sides from buckling outward.
Did you check/change your poppet valve?
I love my L6 .....tearing it apart to refresh the rings and other parts ....has been sitting for awhile....so far so good .....
I have a '95 200 hp offshore, it looks identical to yours. I had the very same issue you did, my telltail even turned to straight steam. The engine was very hot. I didn't even check the t-stats as I changed them two years ago. Instead, I pulled the lower unit first, checked the impeller and it was in nearly the same condition as yours. Found no other issues with it. I put everything back together (without changing the impeller as it was changed two years ago, too) and now it runs with no issues. My outboard had not been run in two years before this incident. I wonder if letting it sit for a long period of time somehow impedes the flow from the pump to the block, but I hardly know what it could be.
The impeller should be changed at least once every 2 years due to its crummy design. I was dumbfounded when I replaced a new impeller and everything worked fine. Son
The impeller blades will take a "set" just sitting and can cause low water pressure.
Why are you doing split screen
Rounding off the 1/2sae trim anode with a 13mm then smashing on a 12 mm is comical.
Fake it till you make it lol.
How do u change the poppet valve?
Should be 2 or 3 bolts you remove below the internal harness. It should pop right off.
Ot a Mercury 150 over heating,put neq thermostat and poppet valve with new head gaskets and water pump. ,,,Need help on rhis ,,,1994 champion Bass boat in
Waterflow issue. Easy. Son
Did you back flush from the thermostats when you had the lower unit off?
Negative.
I am from Argentina. I don't know if your problem was solved. I give you my idea. Many people change the impeller rotor but do not change the gasket that is under the pre-chamber. Not under the plate where the rotor rotates, I say the one under the plastic casing that is under the plate. Look for the exploded view in the workshop manual. There are times when the pump loses pressure there. I don't know if it is correct my translation and if my concepts are understood.
Congratulations for you channel.👍
very good explanation!
Poor water pressure will not be able to counter act the spring of the poppet valve.
Removing the spring is a good test.
Cutting a couple of turns of the spring will cure the problem until the right water pressure is restored.
Ok man I'll be watching I got my notifications and bell on with the (( 🔔))
Thank you so much for your videos, they've been very useful. I could use your help with something. I have a 1986 75hp 4 cylinder that is overheating but I can't locate a thermostat on the motor, nor in the schematics. Someone in a forum said that the 4cylinders don't have a thermostat?! Do you know if that's true? Thanks
No thermostats. Blockage somewhere. Need to reverse vacuum the whole jacket. Son
Follow up. Thanks to water in gear case. Pretty sure dog clutch is rusted in place. Tear down time. Love the follower cam design!!
good video, when you put the impeller cover on which way do you turn the drive shaft, clock or counter clock to seat the impeller? thanks in advance. Saw the fire video, hope you and your family are doing well.
Clockwise my friend. Thank you. Son
I’m running into same problem with my 150 merc it overheated on me so I checked the thermostat and they were original so I replaced them haven’t tried to run it yet but now I’m nervous. Previous owner said he put new impeller in
I wouldn't trust that. Knowing that you have a new impeller vs guessing is good thing. Piece of mind is priceless. Son
The first impeller was cocket sideways a little.
Well done - you didn’t just give up I like what you said just start at the cheapest and work up 👍🔧
At the end of day you get them going I pay no attention It haters
Hey man good video ! I have one question this is my same motor change same part and not pee ! What do you think maybe thermostats need change?
It's gotta be one of the 3. I would test your t stats before throwing money 💰 at it. Son
Bad impeller ... weird. so bad material ?? I am baffled but I saw it with my own lying eyes.
Wild right???? What???
I have had a impeller to spin on the insert.
Thermostats only work during the fitst couple of minutes after starting the engine.
Once fully opened is when telltale starts peeing water steadily.
Poppet valve should start opening after 1500 rpm are being reached, but low water pressure (from partially clogged paths) may avoid Poppet valve to start opening at 1500 rpm but at much higher rpm.
Some people have cut a small part of the spring at the poppet valve because a good spring tension was too much force to be counter acted by the lower than expected water pressure from partially clogged water passages.
The next reason for overheating comes from a damaged electronic units by a bad sparkplug high voltage coil.
Replacing all 6 coils and both control units, in this case, should cure the overheating problems.
Do you need the gear shifter in neutral or forward when taking lower unit off?
Neutral.
Glad to see you got it fixed! Super annoying when you replace the part and check that off your list, just to find out its faulty - where do you have your temp gauge hooked up? is it from the port or starboard head, and how many wires? I am looking to add a temp gauge as well!
Port side. I'm not sure it really matters as long as the wire is long enough. Son
Impeller was OK but not OK....🤔
Yea, I replaced the impeller and all was good despite a new impeller. Son
Ok I have a 1974 150hp TOP. the block gets about 165f but buy the spark plugs it got to 190f. Its peeing good but the water it pees is pretty hot. Even steams a bit in 70° weather. And honestly it doesn't look like it has a thermostat. Any advice? Also, thanks for sharing your frustration.
Something is not working correctly within your cooling system.
@@MerCSonL6cooling system might be alright and engine getting too hot from an electronic fault causing an extra out of time spark at onenor several cylinders.
Love your videos man I m having trouble with my shifter after replacing water pump
What kind of trouble?
Master of the L6 speaks… 👂
The impeller that came out was cooked. When they bend it’s no good replacement was how they should be.
she's cooling now
Looks like a fix to me
Great video sir
Getting more into my 1970 800. Just pulled lower unit. Surprise. Oil seal failed. Seems to be locked in forward. Coming from Mercruiser stuff. I should be able rotate lower shift shaft to test forward/reverse? Everything seemed to work before pulling. Just confused.
Engine needs to be in neutral and so does the lower upon reinstall. You can manually shift the lower into lower. Son
@@MerCSonL6 I'm starting to get it now that I've read service manual. Plan is to "lock" the cam into neutral position before re-inserting prop shaft. Use 9mm socket wrench on shift shaft. Clamp the socket wrench into place against the forward stud.
@@MerCSonL6 breaking out the digital calipers and measuring depth of retaining ring before I pull things apart.
@@MerCSonL6 spring clutch is weird but I get it. Mercruiser, you use the prop to rotate the driveshaft splines into place. Outboard you have to pull plugs and rotate the flywheel by hand.
I had one same thing I must put cover on to tight and wore in the cup
Water pressure gauge would have shown you the problem from the get go. Temp gauges are not to be trusted they are not immersed in the cooling water.
This engine does not have a psi guage for whatever reason. I suppose I could retro fit one.
Easy job mate, T it in to your poppit line that runs off top of block. Done
@@xspower8899 awesome! Thank you my friend!
That won’t be true block pressure. That’s coming out of the thermostats and sent to the exhaust and tell tail. Found this out the hard way.
@@tylerclontz you should do your research before commenting rubbish
Do you know why my water come out to the exhaust port , and barely spit out water from the tailtell unless i run with a high rpm. ? Thanks
That's the relief valve for the exhaust. Son
Thanks Son ! I really appreciated, it’s call a poppet valve right ?
@@timlee9902 no the poppet valve doesn't let water in until it hits a certain psi. Then the t stats don't let water out until it hits around 140 degrees. If too much pressure builds up then the water shoots out of the relief valve. At least thats my understanding of it lol. Son
@@MerCSonL6 Thanks Son! so what part should i replace , do you think this part numer is correct one 803062T1?
@@timlee9902 are you looking for a poppet valve?
It worked out Nice!! No fun when u have a blockage and have to tear the powerhead in pieces..👍😎
Awesome video....Straight forward no b.s. , cool editing . 😎🚤
Thank you my friend. Son