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boosted79 boosted79 is offline
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Join Date: Jan 2015
Posts: 1,263
Got some quality time in the shop. I decided to use the KISS principle for the SC cam pump drive and close couple it like others have. But I wanted some pressure relief holes in the cam like the 930 cams have. I think the purpose of these is to prevent the build up of oil pressure in the cavity between the cam and the original air pump drive housing which may cause oil leakage thru the dynamic seal. It could also affect the seal in the scavenge pump so I decided to drill them. I made a drill guide out of a hunk of aluminum. It centers on a 1/8 drill bit that is a perfect fit into the center drilling of the cam. I periodically cleaned the swarf out of the holes with a wand on a can of brake kleen as I drilled. I had the exhaust valve cover off so I could see when the bit came thru and cleaned up any chips on the inside with a greasy q-tip.







After drilling the two 7/64 holes.


I made some spacers to center the socket heads on the pump drive pin.

Good to go.



Leask WUR and Pierburg. Next is rebuild of the fuel head.
Old 01-14-2017, 08:50 PM
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