Mechanics

OIL PRESSUR

1979 Porsche 924 • 4 cylinder 2WD Automatic • 100,000 miles

Oil presser goes to zero
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N7snu
August 5, 2011.



Oil pressure: Check the oil pressure with a mechanical gauge, if normal replace the oil pressure switch. If abnormal could mean oil pump and engine bearing.

Rasmataz
Aug 5, 2011.
It already has a mechanical Gauge. The oil pressure slowly gosa way after I drive for 10 or 15 minutes. If I turn off the engin then restart it the oil pressuer come gack.

Tiny
N7snu
Aug 5, 2011.
Could be the gauge itself, oil pump and engine bearings get it checked by a professional

Rasmataz
Aug 5, 2011.
I have disconnected the oil gage at the engine and there is nothing coming out. Changed the oil pump, filter and changed the oil. This started after I changed the head gasket and the old one may have been letting some--not much--coolant in to the oil.

Tiny
N7snu
Aug 5, 2011.
Check what drives the oil pump and also did you prime the oil pump

Rasmataz
Aug 5, 2011.
The oil pump is working fine. It is external on the front of the engine and driven by the crankshaft.

Tiny
N7snu
Aug 5, 2011.
The oil pressure goes to zero and oil pump is working fine something don't jive here-could be a clogged oil galleries.

What readings did you get when you hook-up the gauge while engine is running? No reading best check the oil pump again

Rasmataz
Aug 5, 2011.
It starts at 100 PSI and slowly fades to about 5 psi then go to zero.

Tiny
N7snu
Aug 5, 2011.
Is the engine knocking-100psi sounds too much of a pressure points to oil pump and engine bearings for low pressure-Get it checked by a professional-I don't think I can help you further

Rasmataz
Aug 5, 2011.