Oil Pump questions

[Warthog]

Picked up a truck the first of this month. Towed it home because some engine parts where removed.

Installed an new turbo because the other one was toast.

Fired the old girl up and no oil pressure. Diagnosed it to no oil flow. Suspected the oil pump was bad. No knocks, noises, etc.

Removed the pan and found two pea sized chunks of metal. and little else. The pan was clean of debree.

One bolt from the scavenger tube was loose and the oil pump idler bearing seemed sloppy.

The questions are:

Can you bench test the pump? (read the manual. No info provided)

Found these posts:
http://www.steelsoldiers.com/deuce-modification-hot-rodding/18785-few-more-ldt-questions.html

http://www.steelsoldiers.com/deuce/32983-need-little-help.html

Does anyone have the part number for the idler bearing?

Any ideas?

Thanks,
Warthog

 

[KsM715]

Cant really help you with the ?'s but Id be wondering where those two little pieces of metal came from

 

[gimpyrobb]

Joe, I got an oil pump for ya if needed.

 

[mikew]

Joe,

From looking at the parts diagram for the oil pump, it's just a standard two stage gear pump (or maybe two pumps connected together).

Once again, from the diagram, there are two bolts on the rear of the pump that hold it all together.

I'd pull the pump apart and look for damage to the gear teeth or housing. Any big nicks, scores or broken chunks could keep the pump from being able to prime. Thus, no flow.

To test the pump, you just need to spin the input shaft. Being a gear pump, it's a constant volume pump. The thing is if it's damaged as mentioned above, you could spin it fast enough that with no output load it will prime but can't prime when installed.

So, check the lobes for damage!

Mike

 

[m16ty]

If you take the pump apart and there are no pieces missing I'd look further. You need to make sure where the parts in the pan came from before you attempt to start it again.

 

[Warthog]

A little more info.

When I picked up the truck the turbo was partially removed and the the air compressor was MIA.

Since there was no oil flow I could see the turbo and air pump cratering. I think the metal chunks came fro the air pump. I see no other visable damage in the lower end.

I took the oil pump apart and found no visable signs of damage. The brass bushings where worn and the input shaft has some play.

Before I started the engine I checked all the fluids. Oil level showed good, etc.

I didn't think about it at the time but when I drained the oil before removing the pan, I only drained about 2 gal. I am thinking the wrong dipstick has been installed and the engine was 3 gallons short of oil.

Also during my search I found the following manuals.

TM 9-2815-210-34-2-2
http://old.steelsoldiers.com/index.php?module=pagesetter&type=file&func=get&tid=1&fid=file&pid=33

Section 4-17 details the disassembly, inspection and testing of the oil pump

and the parts manual

TM 9-2815-210-34P
http://old.steelsoldiers.com/index.php?module=pagesetter&type=file&func=get&tid=1&fid=file&pid=34

 

[Brock Steel]

Something may have fallen in the return tube from the turbo. I would replace the pump with a new one just to be sure.

 

[m16ty]

Before I started the engine I checked all thuids. Oil level showed good, etc.

I didn't think about it at the time but when I drained the oil before removing the pan, I only drained about 2 gal. I am thinking the wrong dipstick has been installed and the engine was 3 gallons short of oil.



http://old.steelsoldiers.com/index.php?module=pagesetter&type=file&func=get&tid=1&fid=file&pid=34

Did you drain both sumps?

 

[Warthog]

Did you drain both sumps?

Yes. ~2 gallons total. It didn't process at the time that it should be 5+ gallons.

I will be measuring the dipstick against a know correct one tonight.