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WERK I WERK I is offline
Forced Induction Junkie
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Join Date: Jan 2003
Location: Wisconsin
Posts: 3,291
Originally Posted by sundevil64 View Post

It's a mechanical pump. It's on a 78 930. I don't think I understand about unscrewing the drain plug, sorry. I've heard of a "coffee can" test that runs one hose from the catch can and one hose from the scavenge pump into a coffee can. Ideally, once the motor is running the level of oil in the can should remain the same. If it rises there is an issue on the scavenge pump side.

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Did the coffee can test work? This is the best place to start your diagnosis. You'll be able to see the rate of discharge coming out of the turbo, the rate of suction coming from the turbo sump pump. If the turbo sump can not draw enough vacuum, start from the fitting of the sump and work your way back to the pump checking for any pin holes in the lines which would cause a loss of suction.

BTW, I am assuming you have the ball-check valve in position at the oil pressure sender fitting atop the engine.
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 11-02-2011, 05:36 AM
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