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Re: dissappointing compression test

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12-11-2012 10:32:27

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old said: (quoted from post at 13:05:41 12/11/12) E-Bay and compression gauge why not buy local as in from an auto parts store?? Shoot some will rent you one and the real cost is you buy it and then you bring it back and get your $$ back.
That said it could be as simple as sticking rings or carbon build up. I would put say a 1/4 cup of ATF in each cylinder and let it sit a day then run it and after getting it warm do another compression check and I will almost bet them numbers come up a good bit
After seeing all the posts on here about soaking in ATF that was my thought it's been soaking for 3 days now. I don't need to use it for a while so I'm gonna go out and add some more ( when it warms up a little it was 24 degrees this morning ). When I go to start it up should I leave the plugs out and turn it over to blow ATF out or just start it and let it smoke.
This post was edited by carlntexas at 10:39:26 12/11/12.

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12-11-2012 11:07:29

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 Re: dissappointing compression test in reply to carlntexas, 12-11-2012 10:32:27  
You will need to pull the plugs out and spin it over to clear out any excess ATF left in the cylinders if you have any that is. Some of the ATF will fall down threw the rings and then into the oil pan which will not hurt any thing since ATF is a simple oil that is very high detergent and that detergent is why it works well for many things and has even been proven to work better then things like PB blaster and Kroil

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12-11-2012 11:04:39

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 Re: dissappointing compression test in reply to carlntexas, 12-11-2012 10:32:27  
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The purpose of doing a "wet" test after you get a low "dry" result is to identify the source of compression leakage. The reason you add the oil is it acts as a sealant around the rings. If the compression improves significantly after you add the oil - 40 PSI or more- it indicates the rings are leaking. If it only comes up a few PSI as is your case it indicates the rings are sealing fine and the major leakage is somewhere else. I think you are wasting your time with the ATF.


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12-11-2012 12:47:25

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 Re: dissappointing compression test in reply to TheOldHokie, 12-11-2012 11:04:39  
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12-11-2012 11:11:12

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 Re: dissappointing compression test in reply to TheOldHokie, 12-11-2012 11:04:39  
ATF will in fact help if it is a valve problem due to the fact valves stick and get carbon build up and ATF will remove some if not all the carbon if that is the problem.

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