leak down test

syty9933

New member
i already have low compression but im curious what a leak down test will show me before i start taking it apart. I was wondering two things. One is how do you adjust it to top dead center for the test, and two is do you need an air compressor?
 

ghettosled

SYTY SUPERSTORE
Re: leak down test

you will need a compressor that will pump up to 100psi. Probably something will a small tank.

pull all the plugs and turn each cylinder over as if you were setting the motor at TDC but for each cylinder (you can also use a pen light to visually see the position of the piston). The leakdown will tell you if the cylinder is leaking into the oil pan, exhaust, intake, cooling system etc. Then you will know if it is a headgasket, bad rings/broken piston, valve seal, etc.
 
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