Rebuilt 300D loosing oil pressure

[dlginla]

Update:
Called Nickson's about the Accessory Housing, they said the housing is good, relief pin and seat are good, but the oil gears look bad, so the housing and case are being sent back
and next week I will be able to inspect the gears and reorder new parts along with all new gaskets and put it back together. It is their belief that the gears and shaft are the problem.

I will keep you posted as the info come.

[c170b53]

Wonder what is "bad" about them? Hard to imagine the teeth would lose their hardened surfaces in a short run unless something went through the pump. Tom thought the oil pump plate had backed off; not far off the mark but If the gears have or have wobbled at all, likely the acc. case cavity is worn but for me it's a bit hard to understand how wear which normally takes time to occur would occur rapidly as in your case. Any metal in the screens?

[hilltop170]

Be sure to dimensionally inspect the case bearing journals where the oil pump gear shafts run. Mine were wobbled out to the point that bushings had to be machined and pressed into the case. The gears were bad also due to the loss of tolerances in the bearing journals. I'm not intimately familiar with the back side of the engine so what I have described might not be completely accurate but is what I understood from the engine builder.

[c170b53]

Its easy to see issues in the case, gears begin to get displaced from their normal rotation axis by oil pressure if the bores are worn and the gear teeth ends start digging into the cavity walls. I believe this occurs at the top of the cavity where the wear can be seen as a different shade and metal finish. Aryana have a look at yours and maybe if its not too much trouble could post a close-up pic for reference ? The wear doesn't affect the gears as the case metal is relatively soft. So if the gears are damaged, that's a different animal, again anything can happen and will but wear of this nature takes time.

[T. C. Downey]

Update:
but the oil gears look bad,

I find that difficult to believe.