How much pressure when doing leak-down test

I want to do a leak-down test on one of the cylinder that has a 30-psi. How much pressure should I pump in the cylinder.

Is this the metod

bring piston up to tdc on compression stroke and then compress the sick piston and then listen, if air comes out of crank case then the rings are shot, if air comes out of exhaust then the exhaust valve is shot, if air comes out of the intake then the intake valve is shot. I hope I can rent a compressor or can I use a propane tank as a pressure device.

you need to rent a compressor. charge to at least 80 PSI

Quote:

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Originally Posted by DennyW

You mean a propane tank that has been converted to an air tank ? Yes you can. :) Don't forget to block the crank so it doesn't want to turn.

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yeah, about the propane tank, only reason I said not to is because I figured he ment still charged with propane, using it's preassure.

Rolm......you can buy an air pig at Princess Auto pretty cheap. They are handy to have for other uses too.

Have you done a compression test?