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Mitch//pa · 08-23-2015, 03:41 PM

when you put each cylinder on TDC and inject air you cannot let the piston move any as this will open a valve which is what happened in your case when air came out the carburetor.
i hold the crankshaft still at TDC using a wrench on the crank nut...

do a retest holding the crank still.
this wont cause oil burning but also remove the radiator cap when doing the leak down looking for air to come up..

08-23-2015, 03:41 PM	#3
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Questions for engine experts when you put each cylinder on TDC and inject air you cannot let the piston move any as this will open a valve which is what happened in your case when air came out the carburetor. i hold the crankshaft still at TDC using a wrench on the crank nut... do a retest holding the crank still. this wont cause oil burning but also remove the radiator cap when doing the leak down looking for air to come up..