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Old 06-10-2010, 12:54 PM
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Leak down test

When doing a leak down test on a car with and automatic tranny how do you keep the engine from turning when you pressurize a cylender? I put it in gear but it just keeps turning.
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Old 06-10-2010, 01:26 PM
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Quote:
Originally Posted by yeepman2
When doing a leak down test on a car with and automatic tranny how do you keep the engine from turning when you pressurize a cylender? I put it in gear but it just keeps turning.
On big ole V8's, I just bring it up to TDC- as precisely as possible- and that's it. Just keep hands and tools, lines, etc. the heck out of the way of fan blades or belts.

If it's a manual, you can also put it into high gear and lock down the parking brakes just because you can. I suppose you could bribe a helper to hold a flexplate tool on it, but really, you shouldn't need anything but carefully putting it on TDC.

Small engines are the ones that tend to spin over if you're not dead on TDC- but it can be done.
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