Junk Man

I found my notes on where I went to a bearing/seal supplier with a kit for the vacuum pump. If yours is leaking between the vac pump & power steering pump, try these seals. (1 each - i think but don't have notes)

Large O-ring size 039
Small O-ring size 132
Seal 28 X 38 X 7

Seal should be double lipped. O-rings could be Viton which will stand up to oil &, diesel etc.

You'll also want a Cummins gasket between the block & vac pump. Perhaps your old one will work, perhaps you'll glue it with something. I bought a gasket but don't have the number.

Destructions are available online for changing the seals.

hamilton71801

I've put 3 seal kits in mine (double lipped) and it was still leaking. I discovered I had some deep scratches on the housing so I decided to use RTV on the last rebuild...problem solved.

rebal

Cummins seal kit #4089742 $8.57 (bought last week) other places I bought about 15 -64 bucks comes with double lip seal o rings and gasket and instructions too FWIW

GAmes

Are you talking about the mating surfaces where the large o-ring is installed?