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coop63

Leakdown test not useful. Engine keeps turning over. What to do?

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Attempted a leak down test, but every time i connected to the compressed air the piston would move and take me off TDC, this opens the exhaust valve and air flows out. Tried everything i could to keep the engine from turning to no avail. How do you get anything useful diagnostically when the piston won't stay at TDC?

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The engine has to be held at just past TDC, or the timing chain disconnected for the test.

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