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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Compression Low on 1 Cylinder

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Oliver880

01-11-2004 11:59:16




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I have an 880 gas and checked the compression recently. All cylinders showed 155-165 except one which showed 125. I checked it a number of times and it seemed to get better with each re-test finally getting 150psi. Does this indicate a sticky or carboned up valve? I even put oil in the cylinder but it didn't seem to change much. After letting it run and re-checking it starts out at 125-130 again, then it increases about 5 psi at a time each test to about 150. I also noticed when the tester is in that cylinder the starter cranks over slower than when in the other cyliders. Any ideas?

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J. Schwiebert

01-11-2004 16:22:58




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 Re: Compression Low on 1 Cylinder in reply to Oliver880, 01-11-2004 11:59:16  
Have you though of doing a cylinder leak down test or using a vacuum gauge to check for other little things like weak valve springs, etc/



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oliver880

01-12-2004 13:27:44




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 Re: Re: Compression Low on 1 Cylinder in reply to J. Schwiebert, 01-11-2004 16:22:58  
How is a leak down test performed and where would the vacuum guage go? As you can see I'm not a full fledged mechanic but I like to learn and tinker!



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J. Schwiebert

01-12-2004 16:07:43




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 Re: Re: Re: Compression Low on 1 Cylinder in reply to oliver880, 01-12-2004 13:27:44  
Two different tests. The leakdown uses air pressure. The vacuum gauge is done with the engine idling. I was cleaning up and I had fogotten about this but several years ago I wrote an article for "Antique Power" on how to use the vacuum gauge. Send me a U S mail address or an e-mail address and I will make you a copy. It is not hard to do either test. On the leakdown test when I worked for the Perfect Circle engine department we had instructions for that (with a car engine-same procedure) It is probably also still in print.

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RAB

01-11-2004 13:07:00




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 Re: Compression Low on 1 Cylinder in reply to Oliver880, 01-11-2004 11:59:16  
Presumably valve clearances are correct?
Are plugs in other cylinders?
Regards, RAB



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oliver880

01-12-2004 13:22:33




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 Re: Re: Compression Low on 1 Cylinder in reply to RAB, 01-11-2004 13:07:00  
I had all of the plugs out while doing the test and the throttle wide open. I haven't check the clearances yet but I adjusted them just this past spring.



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