more on no oil pressure problem

Thanks for your help so far. I did pull the pan. The oil line to the pump looks very solid, nothing loose.

I checked to see if the gear on the pump turns when the engine is cranked, it does.

I pulled out the pressure relief valve and and it appears ok. It slides easily up and down in the shaft. There was no washer under the spring as shown in the parts book. It always held 20psi, hot or cold.

If the pressure relief value were the problem for no pressure, would that mean it was in the down position? With a flashlight, I could look up into this hole and it looks clean, even shiny in places.

There does not appear to be crud in the engine or crankcase, but I guess it could be inside from previous lack of maintainence.

I thought I had checked the gauge, but maybe did it wrong. I disconnected the line at the block, and then ran the engine. No oil came out so I assumed no oil pressure. Is that right, or is the gauge activated by air pressure?

How could the pump fail catastrophically and still turn that front gear? Seems like it should pump something if the innards are turning, even if it could not hold the proper pressure.

Sorry for all the questions, but I can't figure out what is wrong.

You can email me direct if you wish at
GWellman@centurytel.net

Gerald J.

I disconnected the line at the block and at the gauge and I can blow air through this line...not too fast however as the line is small.

I connected a rubber hose to the fitting on the block and I can blow air into the engine.

Looks to me like all this stuff is ok

Gerald J.

If the shear pin broke, would the outside big pump gear that you can see still turn when the motor turns over? I ask because this gear does turn when the motor does.

Could even be a broken shaft inside the pump.

Gerald J.