help!! leakdown test question
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From: Atlantic city nj
help!! leakdown test question I was wondering if a leakdown test could be achieve by pulling out all my pushrods thus closing all the valves and eliminating the need to get piston to tdc? This just seems easier than doing each cylinder 1 by 1 and having to crank the motor given the lack of room. Seems like finding tdc is kind of an educated guess rather than an exact science with heads still on and motor in car.thanks
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Piston does not have to be exactly at TDC, just as long as both valves are closed. That is, on the compression ( not the beginning of this stroke) or power stroke (not the end of this stroke). After you have tested a cylinder turn the engine 90 degrees and test the next cylinder in the firing order. If your car is a manual ensure it is in gear to stop engine rotation and the park brake is on. I didn't and my car suddenly shot forward.
Last edited by nzgreenfox; Oct 4, 2014 at 06:30 AM.
Thread Starter
TECH Apprentice
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From: Atlantic city nj
What im trying to figure out is if i will get the same results on a leakdown test if I pull my pushrods out? The valves all will be guaranteed closed at that point instead of hoping that they are indeed closed.
FWIW that's how I do it. I think removing the pushrods/rockers is the only way to know 100%.
