M30 oilpump reproduction interest?

[BMW3.0CSi]

Hi all,

Not 100% sure if this question has been asked here in the past but I could not find it via the search function.

I’m rebuilding my engine and sourced some used M30 oil pumps in the past. They are actually not good enough to use because they have significant wear on the part of the pump that goes into the pan. See pictures.

One of the solutions is to weld the wear and then milling it back ‘to spec’. What would you guys do with this or any advice?

The company that rebuilds my engine also offered me to reproduce them, but that cost of course some development costs. Would there be any interest here, or maybe on the e24/28 forums for new pumps that some of you might be aware of? By BMW they are NLA.

Thx!

 

[BMW3.0CSi]

So actually no interest? Bit surprised actually, also based on what is for sale on the eBay’s of this world at the moment.
While I can image the respons based on the fact that this is not a regular maintenance part, unless you are rebuilding your engine.
I know that the rotor housing part is remade, but the other half not.

 

[eriknetherlands]

You might want to reach out to some engine builders and/or restorers to check what they do if the encounter the problem+ how they possibly solve it.

Sfdon?
Scuderia Cologne?
RS garage?

Just trying to help you out, anyone doing e9 repro parts is a friend!

 

[ElGrecko]

There are a number of ways to fix that without having to weld it back up. Welding it up and then facing it off is very viable, folks do this with heads all the time. Making a new one is likely going to be more expensive than repairing it. From the pics it looks like this was die cast and was very inexpensive to originally make. Die casting a replacement part isn't viable since the quantity is so small and die casting houses want to make a few thousand parts in a run, as well as tooling being expensive.

Depending on what is on the other side and how it mounts on the engine you could just face it off and be good to go. Another option is to waterjet out a thin plate of hardened steel, face off the body to account for the thickness of the plate and sandwich it into the assembly. That way you get a hardened wear surface and you take up the clearance that is causing low oil pressure now. If you cast a new part you're going to have to do a lot more machining (specfically the fittings on the other side of the housing) , above the cost of the casting to finish the part, so it's likely a lot less expensive to just make a plate like I described. PM me if you're interested in doing something like that. I have full CAD and manufacturing capability to get this made. Waterjetting out a piece to sandwich in there is pretty inexpensive, you could probably make a half a dozen of them for the minimum charge on a waterjet table.