bad oil pump pictures

[Fingers]

If it made pressure when you spun it with an impact, the gear was slipping on the pump shaft. It happens and is common. Cold, the gear didn't have enough grip on the shaft to work the cold oil.

If the pin was bent on the crank, you picked up a piece of whatever at some point. Again, and sadly, not uncommon. Once kicked loose, the gear will spin on the shaft fairly easy even though the nut seems tight.

I personally am torn if the drive gear should be keyed to the pump shaft or not. I know that the crank drive gears should be for a lot of reasons, but somehow feel there needs to be a safety limit in the pump drive line to deal with the odd piece of crap that might come up the pickup tube.

Losing oil pressure isn't good, but you will not trash an engine in the time it takes you to notice. If either of the crank gears slip, you risk carnage is how I am looking at it.

But, what do I know.....

 

[mainer]

If it made pressure when you spun it with an impact, the gear was slipping on the pump shaft. It happens and is common. Cold, the gear didn't have enough grip on the shaft to work the cold oil.

If the pin was bent on the crank, you picked up a piece of whatever at some point. Again, and sadly, not uncommon. Once kicked loose, the gear will spin on the shaft fairly easy even though the nut seems tight.

I personally am torn if the drive gear should be keyed to the pump shaft or not. I know that the crank drive gears should be for a lot of reasons, but somehow feel there needs to be a safety limit in the pump drive line to deal with the odd piece of crap that might come up the pickup tube.

Losing oil pressure isn't good, but you will not trash an engine in the time it takes you to notice. If either of the crank gears slip, you risk carnage is how I am looking at it.

But, what do I know.....

i too questioned weather the pump gear was slipping on the shaft when i first pulled the front cover and found the nut tight to my surprise (30k ago it was on by only a thread when i lost oil pressure)

so first thought was pump is bad, but i did a lot of diagnosing before pulling the engine with input from many on here.

after i spun the pump with a impact and got oil flow at the pressure relief valve hole and also up at the turbo feed i then assumed well it has to be the gear slipping on the shaft.

so i proceeded to seek some more input from ben, guy, henry, jordan etc and decided to drill a 1/8" hole in the shaft and put a roll pin in and notch the gear.

did that put it back together and no oil pressure, no oil flow, no oil doing anything at all,

pulled the motor at that point and you know the rest.