So I have seen two engines, one a '92 that didn't have a gasket between it and the timing case and a '93 that does.

I have the '93 and it looks like it's leaking a bit around there so I'm wondering if anyone knows if I need it and if anyone has a part number.

Or should I just make some out of 1/32" Rubber/fiber Felpro gasket sheet stock?

Thanks again.

 

I made one out of the rubberized fiber gasket. No problems for over 5,000 miles

 

I guess my inexperience with these engines doesn't help either. I didn't realize that I'm actually talking about the vacuum pump to case, so that has helped me find what I needed.

Thanks anyway.

 

Yes, you need a gasket.

 

Gasket, Accessory Drive Cover Cummins number 3919601
Cummins part numbers seem to change with price increases but that number should be a beginning point for a Cummins parts supplier.