My leak down tester only uses 100psi. It can rotate my MGB engine (haven't
used it on the Healey six), usually happens when the piston is not quite at
TDC. I use a wrench on the crankshaft nut to keep the crank from rotating.
In gear helps too - with the rear wheels on the ground and/or the parking
brake on.
Bob
Richard Ewald wrote:
> If you put 150 PSI into a cylinder you will wind up pushing the piston to
> bottom dead center. Pushing the piston to BTC will open one valve,
> depending on which way the engine rotates. ask me how I know this. An
> engine only runs about about 60 PSI at idle, and that is enough to push the
> piston down. even with a large leak in the cylinder there is an excellent
> change that your compressor can supply the air faster than the problem can
> leak it out. In this case the engine will still rotate.
> I am going to go with there is a problem with the valve train. Either a
> rocker is bound up, valves are mis adjusted, a valve is hung up in the head,
> or a pushrod is somehow stuck holding the valve open.
>
> Rick
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