Jayden71 Posted June 27, 2009 Report Share Posted June 27, 2009 I have a problem that I have never before encountered on a Datsun. I am running straight 30W in my L16 that only has 3000 miles on rebuild. When I fire it up in the morning or whenever, I have good oil pressure at idle. I have let it idle for 30 minutes straight, plenty of time to get oil up to operating temp, 190 degrees, thermostat open. Oil pressure will stay the same. When I drive it oil pressure is again solid, 45 psi or so. When I come to a stop and idle, oil pressure is gone. If I shut it off for about 30 seconds and start it back up, oil pressure comes back even at idle, and it will stay there too, no jumpin around. If I don't shut it off and drive it, the oil light stays on and I have no pressure. There is no odd noise or vibration coming from the engine that would indicate a bad bearing of any kind. Seems like the oil pump is losing its prime. Can this happen? Also oil level is at full mark all the time. Engine does not use any oil. I just rebuilt the oil pump last weekend. Put a new regulator valve in and all. I don't always trust the oil light so I run a gauge as well and when the light comes on that gauge is at almost zero. Its wierd, it could be 90 degrees outside and I have drivin it for an hour, at idle no pressure. Shut it off for just a bit and then I have hot idle oil pressure. Quote Link to comment
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