Would a 12a oil pump work in a 13B Turbo? No, I do not plan on useing one, but my old 13B had a 12a oil pump in it.

 

It might fit, but I wouldn't personally suggest it. The oil demands on a NA 12A and a turbo 13B are a bit different. Mazdatrix has a different oil pump listed for the NA 13B vs the turbo 13B, and I would assume the turbo pump is flowing more. A 12A pump will probably be enough to run the engine, but you could have trouble down the road with insufficient oil volume/pressure.

-=Russ=-

 

I think the T-II pump is a little beefier, as well.

 

No it won't work! The mount from 1986 and up 13b's are different. The 1985 and down motors 12a/13b have the same bolt pattern and can be interchanged but the the desired pumps for the earlier motors are the ones from the 84-85 gslse which are 17.5mm thick.

 

So, it wont fit? Or, it is not recomended.

Then, what kind of Engine did I get from Atkins? The guy that dissasembled it for me said he had trouble getting oil pressure when the rebulid was complete. He looked at the pump and found out it was a 12A. Replaced it with a 13b pump and the pressure was fine.

 

I think that answers your question, or at least makes it a mute point. The 12A pump doesnt pump enough, so you wouldnt want to use it, especially in a turbo engine.

 

Ok, here is the scimmy. The 100 mile breakin on a engine I got had a classic bearring failure, so I was told by the company that bulit it. Not trusting them, I sent it elsewhere to be rebuilt. That, is when the pump was found. I am trying to figure out if that could be why I had bearring failure.

 

What year is your 13b? It it is 86 and up there is now way in hell a 12a pump will bolt up to the front iron the bolt pattern is totally different. The only way that there was a 12a pump on that front iron is if it were a 85 and earlier motor. I think there is a difference between the S4 and S5 n/a and turbo oil pumps. Being that the turbo oil pumps are larger but the bolt pattern remains the same and you can use the turbo oil pumps on n/a motors.

 

ok, I will get the oil pump back, take a pic, post it, and we can figure out what it is, if anything different. Well, the fact that pressure was not buliding up w/the original pump stands, and when another pump was put on, the pressure built fine. So, regardless of what kind of oil pump it was, the first was faulty. Could this case rear bearring failure?

 

Yes, a faulty oil pump can cause bearing failure due to lack of lubication.