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Compression test


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Cold is a good idea.....negates  most other potential issues. Book (you can get ball park numbers, but only as good as the gauge) wants cold to tell you where you want to be, but hot is fine for a comparison if you are looking for a specific, not just wear and tear.

I like cold, because if your valve clearances are too tight and you have starting issues, will show more then. 

If you don't know, high mileage motors often get the exhaust valve clearances tighten and any shit in the valve seats makes them difficult to start as the exhaust valves don't seal. Once they get warm, problem goes away and runs fine.

Edited by Mark/Foggy
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