The Ford Barn

50MercMetalHead · 07-25-2021, 05:46 PM

I’m rebuilding my 8CM after it started losing oil pressure. I found a considerable amount of sand in the engine, and I’m 99.9% sure the source of the pressure loss is the cam and rod bearings, cause they’re pretty bad. I’m unsure if this pump is still good to run though.

It was making about 5psi at slow idle, about 15-20 at fast idle, and I think I saw about 30-40 when I was driving the car in the shop, which got it up to like 1500-2000rpm if I had to guess (no tach). To me, if it had good bearings, I would expect to see normal pressures, but I don’t have a ton of experience with oil pumps so I want other opinions.

Shaft spins really nice, I see and feel no sand or grit anywhere. I’m not sure about the wear on the impellers, no gouges or chunks missing that I see, just wear. Here’s some pictures:

Hopefully I can get some input from you guys who have rebuilt a few of these things, would really appreciate it. Thanks in advance for any input.

07-25-2021, 05:46 PM	#1
50MercMetalHead Member Join Date: Jul 2021 Location: Minnesota Posts: 31	Would you run this oil pump? I’m rebuilding my 8CM after it started losing oil pressure. I found a considerable amount of sand in the engine, and I’m 99.9% sure the source of the pressure loss is the cam and rod bearings, cause they’re pretty bad. I’m unsure if this pump is still good to run though. It was making about 5psi at slow idle, about 15-20 at fast idle, and I think I saw about 30-40 when I was driving the car in the shop, which got it up to like 1500-2000rpm if I had to guess (no tach). To me, if it had good bearings, I would expect to see normal pressures, but I don’t have a ton of experience with oil pumps so I want other opinions. Shaft spins really nice, I see and feel no sand or grit anywhere. I’m not sure about the wear on the impellers, no gouges or chunks missing that I see, just wear. Here’s some pictures: Hopefully I can get some input from you guys who have rebuilt a few of these things, would really appreciate it. Thanks in advance for any input.