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in a leakdown you just pressurize each cylinder and measure how long it takes for each to lose pressure, i think. i have never personally done one. i dont think it requires turning the engine over.
a simple one in which you just look for the source of the leaks could be done by pressurizing each cyl and see if air escapes from the intanke or exhaust.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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