Replacing the original 24mm oil pump with our larger 30mm high volume oil pump provides two main benefits:

1) It helps solve the notoriously-low oil pressure issue that is typical of the waterboxer engine design and the accompanying low oil pressure warning buzzer issue. If you've read our article on the subject—you know that our high-volume pump kit can help quiet that buzzer for good! We include this larger-volume oil pump on every rebuilt GoWesty engine.

2) It solves the common oil leak issue between the oil pump cover and oil pump. We achieve this by procuring the absolute best quality pump available, and then machining the pump housing to accept an O-ring. No more wish-I-could-get-this-silly-paper-gasket-to-stop-leaking gasket!

Features:
• 30mm high-volume pump with pre-checked pump gear & shaft*
• GoWesty O-ring modification**
• Custom-machined OEM pump cover—lower profile to clear coolant cross-pipe
• Bolts and sealing washers to replace the leak-prone stud/sealing nut combination

*We have found over the years (the hard way) that the press-fit between the driven pump gear and the shaft that drives it can vary to the point where the gear can literally spin on the shaft causing all sorts of hard to diagnose oil pressure issues, and even engine seizure. So, we developed a special tool to test each and every driven gear/shaft fit by applying a torque to the gear. We have flunked as many as 50% on some of the brands we have sold in the past because the gear press fit does not pass our test. This test adds very little to the price we charge for our pumps, but the value to you can be enormous. We are always striving to find the best pump on the market, and if we ever find one with gears that check out good 100% of the time: We can finally stop checking them! Yeah, GoWesty has your back.

**Between the pump body and cover we have added an O-ring to replace the gasket. We do not install additional O-rings between the pump body and engine block bore (the “triple o-ring” idea) because all they do is plumb the pressure side of the pump to the suction side and which actually reduces the pump efficiency.

Pro tip: On our rebuilds, we don’t use any of the gaskets that come in the box with the pump. Between the engine block and pump housing we use sealing compound.

Note: Installation instructions are not included. This kit is intended for professional installation only. Please refer to your Bentley Repair Manual for the proper procedure. Oil Pump Puller tool (VW201) required for removal and installation.