Bearing wear is really a symptom of something else going on. I have seen low oil pressure due to bad rod bearings, cam shaft bearings disintegrating and the oil overheating. The most common cause of low oil pressure on the water boxer is the case being shot. Many rebuilders or local shops completely miss this. When the engine gets hot not only does the oil pressure go down due the lower viscosity but the case expands and the main bearing become loser causing oil pressure to be lost inside. When really bad you can feel them under load, sort of a low speed rumble or groan. On a tired engine an oversized pump may just add to the leaks and oil burning due to the increased volume. When the tolerances are not there you will more flow but not always more pressure. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Stuart MacMillan
Sent: Thursday, November 5, 2015 9:04 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Oil Pump Replacement.

Yes, the question is why do you want to replace it?  Trying to fix low oil pressure with a new or bigger pump won't solve the underlying problem for long--bearing wear.

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of SDF ( aka ;jim lahey' - Scott )
Sent: Thursday, November 05, 2015 5:28 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Oil Pump Replacement.

yes, on all three types of engines that come in vanagons.

I've never believed in replacing oil pumps myself much tho.

perhaps a larger/higher performance one once in a great while.

scott

On 11/5/2015 2:46 PM, Tyler Hardison wrote:
> Can the oil pump be replaced with the engine in place?
>
> --t
>