Cylinders Low In PSI ? (HELP)

[xjdriver]

Re: Cylinders Low In PSI ? (HELP)

You could have been on tdc of the exhaust, intake, or compression stroke, you need to be on the compression stroke. You could rotate it over untill you feel a puff of air from the plug hole, then whatch the piston untill its at the top of the stroke. Youll have to do that for each cylinder. Just look up finding tdc on a chevy 350, im sure theres a more simplified way probly using a mark on the flywheel.

 

[BigDog98]

Re: Cylinders Low In PSI ? (HELP)

You could have been on tdc of the exhaust, intake, or compression stroke, you need to be on the compression stroke. You could rotate it over untill you feel a puff of air from the plug hole, then whatch the piston untill its at the top of the stroke. Youll have to do that for each cylinder. Just look up finding tdc on a chevy 350, im sure theres a more simplified way probly using a mark on the flywheel.

Yea that was my original plan. Thanks

 

[BigDog98]

Re: Cylinders Low In PSI ? (HELP)

Yea, from what you described, it is inconclusive . . . It does not sound like you used a leak test gauge, and you could be at TDC of the exhaust stroke rather than the compression stroke. The valves will be open on TDC of the exhaust stroke, whereas the valves will be closed at TDC of the compression stroke. So, you would hear hissing from the intake at TDC on the exhaust stroke.

If the valves were leaking it may be due to pitting of the valve seats or other issues, beyond a mere valve adjustment.



I would recommend doing a full leak test, with the proper gauge set, on all cylinders and see what it tells you.

Alright i guess i just have to redo it. I will try and get the right tester for it.