Is this oil pump usable?

[stownsen914]

I opened this Carrera oil pump and found what appears to be light scoring on the inside of the pump body. I can’t catch a finger nail on the surface, but I detect slight roughness when running my nail over it. The gear teeth show no noticeable damage. Is this acceptable wear?

[Flat6pac]

You’re going to build a whole motor around the questionable pump. Carrera has enough problems with rods 2 and 5 keeping oil on the journals
Send it out to Supertec to have clearance and tested. Might be worth sending
Bruce

[r lane]

It is probably good enough or you can buy a new one. I have seen pumps for sale that have been ''rebuilt''. What's to rebuild. There is nothing you can do to the housing. You can smooth out the scratches, but what does that do for its ability to generate more oil pressure. Put ARP bolts on the rods.

[stownsen914]

I saw one rebuilder mention DFL coating the inside of the pump. Is this a viable solution? (I would have a pro do this.)

[reclino]

Interesting topic. I just got my case split open and will be looking at my oil pump soon. The bearings and crank look almost perfect, it will be interesting to see how the inside of my pump looks.

[Mark Henry]

Originally Posted by stownsen914

I saw one rebuilder mention DFL coating the inside of the pump. Is this a viable solution? (I would have a pro do this.)

I do this but it won't fix substantial scratches, at most it adds about .0003" to the surface. Deep scratches are completely visible after DFL coating.
All pumps will have light scratches comparable to fine cylinder honing, but the easy quick check is to run your finger nail along this surface, if you catch your nail on the scratches it's NFG.
I do allow a couple deep scratches but only if it doesn't radiate the surface completely round.
The OP's pump I see scratching on the bearing/bushing, the pump is only turning at half the speed of the crank so there should be little wear. Main cause is poor maintenance, I can re-bush it's cheap and easy, but I'd rather start with a pump without this issue.
I say the pump in question is trash, but still do the fingernail test as pictures are deceiving.

The pump below has minor scratches, 2nd pic shows after DFL and you can no longer see the minor scratches, so this pump is acceptable.

[stownsen914]

Thanks Mark. I wasn't catching a nail on the scratching on the inside of the pump housing and I don't see or feel any deeper gouging, but the surface does have a light textured feel to it as I run my nail across.

[Mark Henry]

Like I said it's hard to tell in a pic.

[Luke M]

I sent my 3.2 oil pump out to Glenn Yee. I had another redone and ready to go pump in hand in 10 days. I went back and forth on this for a good week with my old pump. The motor was running and under 100000 miles when I got it. I'm rebuilding the current 3.2 to a 3.4. I didn't want any issues with the oil system and it's not like it's an easy fix later. CYA and get the pump checked out or replace it with a new one.