View Single Post
Robbbyg Robbbyg is offline
Registered User
Robbbyg's Avatar
Join Date: Aug 2008
Posts: 1,138
Originally Posted by Ronnie's.930 View Post
Robby, the scavenge pump is mechanical, and it is driven off of the left camshaft via a small pin mounted through the tip of the pump's drive-gear axle. If the pin breaks, or gets severely worn, the pump will not work right or at all.

Like others have mentioned, you need to first test the scavenge pump's pumping capacity. If it is insufficient, you need to see if you have an air leak in the oil line leading from the turbo drip tank to the scavenge pump (an air leak allows the thing to suck air, and pump very little oil, and a tiny hole will not leak much oil even though it will allow enough air into the line to cause a problem when the car is running). If no leaks are found, you will need to remove and dismantle the scavenge pump and repair as needed).

If the flow test checks out OK, then exhaust gasses are getting past the turbo's axle seals and pumping air and oil out of the drip tank breather. This could have potentially been caused by damage to the turbine impeller and/or axle - by maybe a broken piece of air injector getting drawn into it (or hardened JB Weld).

Page 63 has an exploded-view drawing of the scavenge pump, and all of its parts and related hoses (the pump itself is item #31). See dude, I remembered you saying that you liked books with pics!!!!

Hi thanks,
Guess what when i reassembled the motor i realised i left off the charge line from the wastegate to the IC could this cause the oil symptom?

I also checked the Turbo and the impeller etc is all good, no play fore or aft
Last row 1977 3.0 930 260hp built, still reassembling
Row 1998 996 MK1 3.4 296hp new daily driver
Old 06-06-2014, 03:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #25 (permalink)