⬇️Things used in this video: 1. Compression Tester: amzn.to/2z13CaC 2. Ratchet and socket set: amzn.to/2inoxOY 3. Mechanic’s Tool Set: amzn.to/2Bzmccg 4. Disposable Gloves: amzn.to/2zSRuxO 5. Common Sense 6. Full HD Camera: amzn.to/2AvoEk7 7. My computer for editing / uploading: amzn.to/2i2sKYz 8. Video editing software: amzn.to/2jv5Fhf 9. Thumbnail software: amzn.to/2k7tz6C 🛠Check out my Garage to see what I use every day and highly recommend: www.amazon.com/shop/scottykilmer 👉Follow me on Instagram for the latest news, funnies, and exclusive info / pics: goo.gl/ohy2cA
You seriously make learning fun Scotty. The first video I watched of yours was "Replacing A Clutch" and I couldn't stop laughing. I have never seen somebody with so much enthusiasm while working as hard as you do. I am leaving for the U.S. Navy this September 11'th for the (AM) Aviation Mechanic program and want to thank you for the knowledge and mechanical comprehension you have given me for the past few years and that every time an F-18 takes off, it has a piece of you with it. -Tim
Sir...thank you. Because of you I’ve learned a lot on my own. Keeps doing what you’re doing there’s a lot of people w/o dads out there or no one to teach em.
you can disconnect the ignition system and remove the fuel pump fuse if you want to be really safety conscious. more than 15 percent diff is bad. No, you don't have to open throttle, just take readings in the same manner for all cylinders. Wet test is done to see if piston rings are worn, pressure goes up on wet testing if they are
@petisze as long as you do the same each time, you can leave the throttle open or closed to get accurate readings. Cranking that short time will not kill coils,only if you did it for many minutes on end. Scotty
Since they spark plugs are all removed, any fuel will just be pushed out the empty holes. If you're worried about safety, doing the test in an enclosed area (unlike my test which was done outside), you can remove the fuel pump fuse. Scotty Kilmer
this made my day. i was gonna do this to my car and decided to watch this first and i have the same exact car he does in this video :O!!! 1990 toyota celica :P
Thank you for your patriotic service in the military , as well as being good at whats best on youtube. You are truely a righteous soul! Much love and health and prosperity Uncle kilmer . Cant wait for your next show.
As I said, the actual pressure readings vary widely with gauges, so you measure the difference in pressure, and if one cylinder is more than 15 percent different than the others, that cylinder is worn inside. the actual pressure inside any engine varies widely, depending upon the outside temperature, the barometric pressure that day, the humidity, and the condition of the engine. And new engines have higher pressures that older worn engines. Scotty Kilmer
Hi Scotty, thanks for all your great videos they will help extend the life of my aging car. However, this method blew two of my ignition coils. There was a loud bang when cranking, I think a spark must have arced between the two coils and I had to replace them. I can see your car here doesn't have individual coils so is a little different but people should know it's really important to disconnect these. All the best.
generally, digital read out gauges do not last long and have many problmes, I've tried out various ones and always went back to mechanical whenever possible
Thank you Scotty for the super quick response. And I did a dried and wet compression test it was good,and I pulled the coils with the spark plugs on and I cranked the engine and I see spark on the spark plug. Car smells like is running rich on fuel and spark plugs look wet. Thinking on checking the camshaft. No more ideas . Thank you for your help
you can if you want, but if the ignition system is disabled it can't start, and any gas put into the cylinders would just blow out the exhaust as engine is cranked.
@scottykilmer That sucks buddy,I had a compression test done at a local shop and,from what they said, it was the valves. I had the head machined and valves re-seated only to put it back together and have the run exactly the same. I should have just done the rings but now I will have to get another set of bolts and another head gasket. Thanks for replying back to me. Scott
they are worn, but not totally if it runs good enough. I've seen them run years that way.If you like my car help, be sure to watch my live car talk show every saturday morning at 10 AM CST on google events. Just go to my scotty kilmer channel on youtube saturday morning at 10, and click on the google plus icon on the top right corner. That takes you to the event where you can ask me questions Live. You do have to be a member of google plus, but that's free
As long as you do it with the throttle closed, or the throttle opened, the readings will be accurate when comparing the cylinders to each other. You can do it with a closed or open throttle, as long as you check them all the same way. Scotty Kilmer
@fullvibe87 Diesel engines are Cows to do compression tests on. You need special tools, and have to remove each glow plug to check the pressure. That can be a royal pain. Scotty
Intereting. Thanks. I've also noticed that it sometimes takes cranking the car several times to get the top PSI. Otherrwise I can get large differences between cylinders. Not sure if its my tool or not but it seems to peak sooner with the throttle open.
@331lilcoupe It varies widely, which is why they tell you to compare the pressures on the gauge, not depend on the actual reading. Plus the pressure gauges are not all that accurate in terms of actual pressure. Scotty
What I usually do, is remove the fuse for the fuel injectors before i do it, so that way i don't have a bunch of unburnt fuel running through my engine
Check to make sure your fuel injectors are firing, many times the crankshaft position sensor goes bad and you lose fuel injection pulse. NO pulse, no fuel gets sprayed into the engine. Just for kicks, spray some starting fluid in the air filter hole to see if it starts. If it does, you know you've lost fuel to the engine then for sure. Scotty Kilmer
@sicktj No, the gauges are very inaccurate as to actual pressure, depends too much on the temp outside, the baro pressure, the engine temp, etc. It's the difference that really means something. Scotty
@21mejia25 you can do it any way you want. As long as you do it the same for all cylinders. it's the difference between readings that counts mainly, not the actual readings, as those gauges aren't all that accurate to begin with when it comes to actual pressure
@DaBossk Well, they are all close, which is good. But 115 isn't very much pressure, though in an older engine if it runs OK, it will last a while that way. Scotty
It sure is a good way of checking rings. You can also use a leak down pressure tester to do this, which I will make a video of sometime in the future. Scotty Kilmer
They do, but it's built into the distributor, so you'd have to replace the distributor to replace the sensor. That's what determines injector firing on that engine set up. And put a noid light on the injectors to see if they are firing (the light will flash if they are.) "Scotty Kilmer
Hi Scotty, if my engine is not starting, should still do a compression test before diagnosing fuel or ignition? You mentioned a compression test should be done on a warm engine. Thanks!
You can if you want, that's merely a safety issue of tiny amounts of fuel coming out the spark plug holes IF you are working inside a closed building. I work outside in the open air, so it doesn't matter there. Scotty Kilmer
@imautuber444 THERE are MANY ways to do a compression test, and as long as you are consistent and do them all the same, throttle open or closed, it does not matter how you do it, as it's the difference in cylinder pressure that counts in this test. BUT, yes, if you want the actual highest readings, you would do all that. Plus you would do a cylinder leak down tests with a different gauge, but that's a bit too complex for the average guy which is what this video is for. Scotty
Scotty, my son's '91 Toyota Tercel has only 170K Kms (105K miles) on it. It's in great shape and very clean overall, but I did a compression test when we noticed it was losing power on hills. Three cylinders show 150 psi but one shows only 90.The plug on that cylinder is fouled with oil. Is this the end for this car? Everything else works great.
@dragata1 I'm a small engine technician. 234psi for a 12hp briggs is great!! I always get readings of around 100-150psi and i have the same tester as scotty has in this video.
Scotty you the best , you provide clear easy to follow info and even better you truly cheered me up with your presentation , specially your trunk appearance lmao, god bless
@Infinitrium If you're careful, you can take it out of a warm engine. Just don't overtighten stuff and put some anti sieze lube on the plugs before putting em back in. Scotty
Hi Scotty, I googled "compression check engine youtube" and you were on the top of the list. I took my car in today to a shop (first time there referred by AutoZone) and was told on my 96 Geo Metro, Numbers are as follows: 120, 110, 100, 110. Supposed to e more than 125? I earn very little income. What is the worst thing that will happen if I do not correct this?
Linda J just keep driving it, and add oil as it burns out. rebuilding that engine is more than the car is worth. They can still run a long time if you keep oil in them
Scotty Kilmer Thanks Scotty! I have subscribed to your page! I like your vids and we all appreciate your mechanical expertise for free. Again, thank you!
@TRcustomengineering the briggs engine block had cracks everywhere and the gaskets i couldnt find so i bought JB weld and used it as a sealer and gaskets its working GREAT
Hey I just noticed in this video that he was using the harbor freight compression tester. Im commenting to tell everyone on here never to buy that tester, I recently rebuilt my ATC and after the rebuild I tested it with the harbor freight tester said it only had 120 psi.
@Artyfil Sure, just make sure there isn't a big difference in them, and that they all aren't REALLY low pressure of an engine that's just plain worn out. Scotty
I have a Honda Civic Hybrid that has 2 spark plugs per cylinder. How do you suggest I do a compression test? do I pull the plug wire from the other spark plug for the cylinder I'm testing so the testing cylinder doesn't fire? or just let it run?
Hi Scotty, nice Video!!, how can I check the compression on a diesel engine?? same procedure but removing the inyectors instead? or can I do it on the pre-heating plugs? and what would be a reasonable difference between cylinders. Thank you!!
so I did my own compression test, but made the mistake of leaving the other 3 spark plugs in and letting the car start. I was clueless, as it was the 1st time I did it. I got about 117-120 in all 4 cylinders doing this. car is a 04 camry with 180k miles. Should I retest the proper way and let it crank a few times?
Hi Scoot, I just purchased a a 1988 mr2 supercharged jdm used engine ,# 1 #2 cylinder read 90 psi dry ,wet 120psi and #3 #4 cylinder read 20psi dry and wet tested. what should I do next because I can't return it is no warranty.thanks
If you have a cylinder with really low pressure compared to the others, you would have to tear the engine apart and see what was broken inside, like bad valves or worn piston rings. Scotty Kilmer
I did the compression test on a cold engine. Then found out the engine should have been running. Wow! My 3.0 mercrusier had 60,30,30,30. I know I did the test wrong with the engine not being warm but I cant start it just yet. Hope I don't have problems on my hands.
As I've already said, it doesn't matter if you have the throttle open or closed, as long as you do all the tests either open or closed. What you care about is the difference in pressure in the cylinders as I show in the video, NOT the actual pressure reading itself, which is not all that accurate. scotty kilmer
![How To Perform a Compression Test - [EASY]](http://i.ytimg.com/vi/3VmmL0YAO14/mqdefault.jpg)
⬇️Things used in this video:
1. Compression Tester: amzn.to/2z13CaC
2. Ratchet and socket set: amzn.to/2inoxOY
3. Mechanic’s Tool Set: amzn.to/2Bzmccg
4. Disposable Gloves: amzn.to/2zSRuxO
5. Common Sense
6. Full HD Camera: amzn.to/2AvoEk7
7. My computer for editing / uploading: amzn.to/2i2sKYz
8. Video editing software: amzn.to/2jv5Fhf
9. Thumbnail software: amzn.to/2k7tz6C
🛠Check out my Garage to see what I use every day and highly recommend:
www.amazon.com/shop/scottykilmer
👉Follow me on Instagram for the latest news, funnies, and exclusive info / pics:
goo.gl/ohy2cA
What could be causing my car to smoke when it’s cold started?
@@MB-nl3ss water and condensation on exhaust it’s normal for cars to do that on cold start
You seriously make learning fun Scotty. The first video I watched of yours was "Replacing A Clutch" and I couldn't stop laughing. I have never seen somebody with so much enthusiasm while working as hard as you do. I am leaving for the U.S. Navy this September 11'th for the (AM) Aviation Mechanic program and want to thank you for the knowledge and mechanical comprehension you have given me for the past few years and that every time an F-18 takes off, it has a piece of you with it. -Tim
Sir...thank you. Because of you I’ve learned a lot on my own. Keeps doing what you’re doing there’s a lot of people w/o dads out there or no one to teach em.
you can disconnect the ignition system and remove the fuel pump fuse if you want to be really safety conscious. more than 15 percent diff is bad. No, you don't have to open throttle, just take readings in the same manner for all cylinders. Wet test is done to see if piston rings are worn, pressure goes up on wet testing if they are
How do I warm up my engine, if it doesn't start?
Torch it!
Break fluid in the intake if it starts change your fuel injectors 😷
Then do the air compressor method.
U need a new engine happened with me
You give it a blanket and hot chocolate
@petisze as long as you do the same each time, you can leave the throttle open or closed to get accurate readings. Cranking that short time will not kill coils,only if you did it for many minutes on end. Scotty
Thanks that was the answer I was looking for.
Yes, warm it up first, then pull the plugs. Scotty Kilmer
Since they spark plugs are all removed, any fuel will just be pushed out the empty holes. If you're worried about safety, doing the test in an enclosed area (unlike my test which was done outside), you can remove the fuel pump fuse. Scotty Kilmer
Your the man Scotty, Thanks for the great videos!
this made my day. i was gonna do this to my car and decided to watch this first and i have the same exact car he does in this video :O!!! 1990 toyota celica :P
CONVENIENT
Thank you for your patriotic service in the military , as well as being good at whats best on youtube. You are truely a righteous soul! Much love and health and prosperity Uncle kilmer . Cant wait for your next show.
As I said, the actual pressure readings vary widely with gauges, so you measure the difference in pressure, and if one cylinder is more than 15 percent different than the others, that cylinder is worn inside. the actual pressure inside any engine varies widely, depending upon the outside temperature, the barometric pressure that day, the humidity, and the condition of the engine. And new engines have higher pressures that older worn engines. Scotty Kilmer
Hi Scotty, thanks for all your great videos they will help extend the life of my aging car. However, this method blew two of my ignition coils. There was a loud bang when cranking, I think a spark must have arced between the two coils and I had to replace them. I can see your car here doesn't have individual coils so is a little different but people should know it's really important to disconnect these.
All the best.
Just learned something new with my dad’s old tools! Thanks for sharing!
Thank you Scotty! For all these years of great learning.
generally, digital read out gauges do not last long and have many problmes, I've tried out various ones and always went back to mechanical whenever possible
Thank you Scotty for the super quick response. And I did a dried and wet compression test it was good,and I pulled the coils with the spark plugs on and I cranked the engine and I see spark on the spark plug. Car smells like is running rich on fuel and spark plugs look wet. Thinking on checking the camshaft. No more ideas . Thank you for your help
you can if you want, but if the ignition system is disabled it can't start, and any gas put into the cylinders would just blow out the exhaust as engine is cranked.
@scottykilmer That sucks buddy,I had a compression test done at a local shop and,from what they said, it was the valves. I had the head machined and valves re-seated only to put it back together and have the run exactly the same. I should have just done the rings but now I will have to get another set of bolts and another head gasket.
Thanks for replying back to me.
Scott
they are worn, but not totally if it runs good enough. I've seen them run years that way.If you like my car help, be sure to watch my live car talk show every saturday morning at 10 AM CST on google events. Just go to my scotty kilmer channel on youtube saturday morning at 10, and click on the google plus icon on the top right corner. That takes you to the event where you can ask me questions Live. You do have to be a member of google plus, but that's free
As long as you do it with the throttle closed, or the throttle opened, the readings will be accurate when comparing the cylinders to each other. You can do it with a closed or open throttle, as long as you check them all the same way. Scotty Kilmer
Hey Scotty would you have to reset your check engine light after one of these tests?
@rockpetrad could be valves are too tight, yes. But more often it's a problem like cracked head gasket or worn piston rings. Scotty
Yes, on vehicles that have single ignition coils. And if you have multiple coil on plugs, just unplug them all when doing the test. Scotty
@fullvibe87 Diesel engines are Cows to do compression tests on. You need special tools, and have to remove each glow plug to check the pressure. That can be a royal pain. Scotty
Just go to any auto parts stores, they all sell em. I got mine at harbor freight tools.
@DcPwnsify then you just take the readings cold, and if they are really low, engine is damaged inside.
I agree with you, streetfires, and it's usually easy enough to pull a connector off the coil to disable it.
Intereting. Thanks. I've also noticed that it sometimes takes cranking the car several times to get the top PSI. Otherrwise I can get large differences between cylinders. Not sure if its my tool or not but it seems to peak sooner with the throttle open.
if it will fit in the hole it will, try it and see. If it's just a push down tester, you push it down while another cranks the engine over
@331lilcoupe It varies widely, which is why they tell you to compare the pressures on the gauge, not depend on the actual reading. Plus the pressure gauges are not all that accurate in terms of actual pressure. Scotty
What I usually do, is remove the fuse for the fuel injectors before i do it, so that way i don't have a bunch of unburnt fuel running through my engine
Completely unnecessary
@@nordicpride9708 I always thought you had to disconnect the fuel system like that though. Can you explain?
Check to make sure your fuel injectors are firing, many times the crankshaft position sensor goes bad and you lose fuel injection pulse. NO pulse, no fuel gets sprayed into the engine. Just for kicks, spray some starting fluid in the air filter hole to see if it starts. If it does, you know you've lost fuel to the engine then for sure. Scotty Kilmer
Scotty nice 5th gen celica, i got one myself with the base 1.6L engine, great car especially now with gas prices up.
@sicktj No, the gauges are very inaccurate as to actual pressure, depends too much on the temp outside, the baro pressure, the engine temp, etc. It's the difference that really means something. Scotty
@21mejia25 you can do it any way you want. As long as you do it the same for all cylinders. it's the difference between readings that counts mainly, not the actual readings, as those gauges aren't all that accurate to begin with when it comes to actual pressure
Yes, those do work best and are safest, but you'll never get the adapter stuck IF you put a little engine oil on it first.
scotty hopefully before I die I get to meet you. you're so awesome!
this is my indoor voice, I'm half deaf from fighting machines 44 years.
very basic and step by step. Just right, thank you sir
@xswsxcde you can, but the valves are opening and closing and this short time period it won't hurt anything
@TutorialTelevision they may not start up, they may run poorly, they may backfire or burn lots of oil.
@DaBossk Well, they are all close, which is good. But 115 isn't very much pressure, though in an older engine if it runs OK, it will last a while that way. Scotty
@topgrain Yes, if you want to be ultra cautious, do this. Scotty
It sure is a good way of checking rings. You can also use a leak down pressure tester to do this, which I will make a video of sometime in the future. Scotty Kilmer
Can't do it on a "warm" engine, I'm working on it and have the carb off!
But it will be just fine cold.
They do, but it's built into the distributor, so you'd have to replace the distributor to replace the sensor. That's what determines injector firing on that engine set up. And put a noid light on the injectors to see if they are firing (the light will flash if they are.) "Scotty Kilmer
yes, an indirect way of using an oscilliscope and graphing the cranking voltage can be used, but it is not as accurate.
Hi Scotty, if my engine is not starting, should still do a compression test before diagnosing fuel or ignition? You mentioned a compression test should be done on a warm engine. Thanks!
Scotty, you are so kind to give you helpful advice to everyone. Your videos are nice and very clear thanks.
@13scott71 then the cylinder is leaking, losing pressure, normally bad comp rings. Scotty
You can if you want, that's merely a safety issue of tiny amounts of fuel coming out the spark plug holes IF you are working inside a closed building. I work outside in the open air, so it doesn't matter there. Scotty Kilmer
@imautuber444 THERE are MANY ways to do a compression test, and as long as you are consistent and do them all the same, throttle open or closed, it does not matter how you do it, as it's the difference in cylinder pressure that counts in this test. BUT, yes, if you want the actual highest readings, you would do all that. Plus you would do a cylinder leak down tests with a different gauge, but that's a bit too complex for the average guy which is what this video is for. Scotty
Scotty, my son's '91 Toyota Tercel has only 170K Kms (105K miles) on it. It's in great shape and very clean overall, but I did a compression test when we noticed it was losing power on hills. Three cylinders show 150 psi but one shows only 90.The plug on that cylinder is fouled with oil. Is this the end for this car? Everything else works great.
+Albert Head yes, those were weak engines, a big reason tercels are no longer made
I love this guy's videos. He is a really good teacher and also he makes me laugh. Love the tips and goes straight to the point. Thanks boss
@dragata1 I'm a small engine technician.
234psi for a 12hp briggs is great!!
I always get readings of around 100-150psi and i have the same tester as scotty has in this video.
Scotty you the best , you provide clear easy to follow info and even better you truly cheered me up with your presentation , specially your trunk appearance lmao, god bless
An Oldie but a Goodie. Thanks as always.
@Infinitrium If you're careful, you can take it out of a warm engine. Just don't overtighten stuff and put some anti sieze lube on the plugs before putting em back in. Scotty
crank it over by hand 2 times, then recheck the cam marks
Scotty, Thanks for the great videos. Your vids are to the point and without information we don't need. Thank ya for being so dependable.
@Andrexthepuppy It could, but normally that's worn piston rings inside the engine allowing pressure to build up inside the crankcase. Scotty Kilmer
Thanks so much, I now know how to check out things on my restore project. Your videos are a tremendous help!
Thanks a lot for your videos Scotty.
You are one of the best .
@scottyKilmer you are the best at explaining! God bless you
Hi Scotty, I noticed in this video you did not disable the the ignition system. Is that something that needs to be done?
no, if the other cylinders start up and run, you would get an even more accurate reading on the one you were doing
Mr. Kilmer! I love your videos! hahaa! I'm as hyped up as you are about cars! Thank you for all the knowledge.
Thanks Scotty, you just saved my day!
Hi Scotty, I googled "compression check engine youtube" and you were on the top of the list. I took my car in today to a shop (first time there referred by AutoZone) and was told on my 96 Geo Metro, Numbers are as follows: 120, 110, 100, 110. Supposed to e more than 125? I earn very little income. What is the worst thing that will happen if I do not correct this?
Linda J just keep driving it, and add oil as it burns out. rebuilding that engine is more than the car is worth. They can still run a long time if you keep oil in them
Scotty Kilmer Thanks Scotty! I have subscribed to your page! I like your vids and we all appreciate your mechanical expertise for free. Again, thank you!
@BadAzzR3dn3k major, in most cases requiring rebuilding the engine or at least replacing the head gasket.
that stuff's B.S. If engine is worn, you have to rebuild it.
u have to remove power to the distributor and fuel pump too, plus press the gas pedal to the floor to open the throttle
If there is a stuck compression piston ring, will this change the compression reading on that cylinder?
@TRcustomengineering the briggs engine block had cracks everywhere and the gaskets i couldnt find so i bought JB weld and used it as a sealer and gaskets its working GREAT
Well, I used to do a segment called "Crank It Up" and was REALLY tempted to add some porn to the car repair advice. But I never did. Scotty Kilmer
Is it necessary to disconnect the fuel injection ... and also disconnect the primary side of the ignition ?
Thanks for your valuable information. I have a question how I can test cylinder pressure of diesel engine
Yea, they're really comfy. SAS gloves rule. Scotty Kilmer
Hey I just noticed in this video that he was using the harbor freight compression tester. Im commenting to tell everyone on here never to buy that tester, I recently rebuilt my ATC and after the rebuild I tested it with the harbor freight tester said it only had 120 psi.
Thank, you Scotty for your very clear video.
Should the fuel pump and ignition coils be disconnected first for safty? Maybe smart ECUs on some modern cars will do it electronically.
Oh okay, gotta warm up the engine a few times!!! Thank you! 👻🔥
also checked vacuum hoses. it misses also when choke is applied and driving it with choke until warm up.
@Artyfil Sure, just make sure there isn't a big difference in them, and that they all aren't REALLY low pressure of an engine that's just plain worn out. Scotty
@scotty it looks to be a push down tester. ok imma try it. thanks for replying and keep the vids coming.
I really like these old videos
I have a Honda Civic Hybrid that has 2 spark plugs per cylinder. How do you suggest I do a compression test? do I pull the plug wire from the other spark plug for the cylinder I'm testing so the testing cylinder doesn't fire? or just let it run?
Hi Scotty, nice Video!!, how can I check the compression on a diesel engine?? same procedure but removing the inyectors instead? or can I do it on the pre-heating plugs? and what would be a reasonable difference between cylinders. Thank you!!
I have that same gauge, there awesome.
Did you get it at harborfreight?
Do you do much with motorcycle engines or ATV's?
Thanks
sure, you remove the glow plugs and put a special compression adaptor in those holes to measure it
Scotty how many cranks for each asking as there the same amount correct ? Like 6 seconds a piece?
so I did my own compression test, but made the mistake of leaving the other 3 spark plugs in and letting the car start. I was clueless, as it was the 1st time I did it. I got about 117-120 in all 4 cylinders doing this. car is a 04 camry with 180k miles. Should I retest the proper way and let it crank a few times?
You want to hold throttle to the floor when cranking, right?
Hi Scoot, I just purchased a a 1988 mr2 supercharged jdm used engine ,# 1 #2 cylinder read 90 psi dry ,wet 120psi and #3 #4 cylinder read 20psi dry and wet tested. what should I do next because I can't return it is no warranty.thanks
If you have a cylinder with really low pressure compared to the others, you would have to tear the engine apart and see what was broken inside, like bad valves or worn piston rings. Scotty Kilmer
This test I can really use. Manay thanks.
you can do a compression test on any engine, hot or cold. do that first, cause if it's bad, no sense going any further
I did the compression test on a cold engine. Then found out the engine should have been running. Wow! My 3.0 mercrusier had 60,30,30,30. I know I did the test wrong with the engine not being warm but I cant start it just yet. Hope I don't have problems on my hands.
This engine has not been ran in 4 years.
How can I tell if I have a bad value? Any way to check for that? Or will this test tell if something is wrong?
As I've already said, it doesn't matter if you have the throttle open or closed, as long as you do all the tests either open or closed. What you care about is the difference in pressure in the cylinders as I show in the video, NOT the actual pressure reading itself, which is not all that accurate. scotty kilmer
@jarmchairpilot1 Yep, they only get tight by the valves or seats breaking down, with normal wear they get looser. Scotty