I removed the shutoff valve from my 84 300TD and found there wasn't any metal disc between the valve and the IP body, just a single paper gasket. It's my understanding that there is supposed to be a metal ring with a gasket on each side.

Also, the retaining bracket is bent around the 4 bolt holes. I'm thinking a PO tightened it way too much to compensate for the missing ring.

Would a similar sized washer be sufficient here (I would have to file out a notch on the inside to match valve), or do I need to track down a replacement part?

I was able to find this part and installing it fixed a leak I had been chasing down.

In case someone stumbles on this thread in the future, the ring I describe above is supposed to be there and without it you will have leaks around the shutoff valve that might look like oil filter housing leaks (since the oil will run down the IP and get that area of the engine wet)

Where did you find the part?

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Sam

84 300SD 350K+ miles ( Blue Belle )

I found it at Abe's here in Seattle. He is often able to come up with parts that I can't find anywhere else. Often I buy new parts from him, but in this case he pulled it off an old injection pump he had sitting around.