Oil pump

Asked by Mar 05, 2019 at 08:16 AM about the 2010 Toyota Corolla

Question type: Maintenance & Repair

I have overhauled my car's engine. New bearings, rings, water pump, oil pump, full gasket set. After starting the car, I checked the oil pressure with a oil pressure gauge. The oil pressure was 60PSI. When revving the car slowly. the oil pressure dropped to 0 PSI. I then fitted a second new oil pump but it still does the same. What can be wrong?

6 Answers


Could be possible that the oil is not returning to the pan quick enough. If the pump is pushing too much oil to the top of the engine, the sump may be running dry which will drop the pressure to 0. Does the oil pressure return if you stop the engine for a minute and restart?

1 people found this helpful.

Maybe the bearings have too much clearance? If you did not machine the crank you may need to tear the engine down and do it over.


A 3rd possibility = Defective oil pressure regulator.

Gary your answer was the best. Yes after switching off the engine for a minute, the pressure is back. What could probably the problem be?


The oil returns to the pan through journals from the head to the block. I hate to say it but it may be that the head gasket was improperly installed, blocking the returns. I am not familiar with your engine but you can probably pull the valve cover and check for blocked oil return passages.

1 people found this helpful.
Best Answer Mark helpful

Thanks Gary. I will definitely check that.

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