From: "Dana Morphew" <kadm@PUGETSOUND.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, June 18, 2001 7:56 PM
Subject: Re: Oil Level Again

> The Mann filter for the Wasserboxer equipped Vanagon has a bypass valve
> which lets the oil bypass the filter element at pressures above 1.5
> bar.  The Mann diesel filter doesn't let the oil bypass the filter until
> the oil pressure reaches 2.5 bar.  Critical?  I don't know.  A "bar" is
> between 14 and 15 lbs. of pressure.
>
> -Dana-
>
Dana,

Do you suppose that the 1.5 Bar rating indicates the pressure differential
between upstream and downstream of the element? Or is it a rating referring
to normal atmospheric pressure?

It seems that if it is the latter, it would be in bypass mode during most of
the duty cycle of the engine - and that would not seem to make sense.

My Van appears to be equipped with one of these valves integral to the
filter mounting stand - and it seems to be of the differential design.

Tom and Dana Cates
Asheville, NC
83 Air-Cooled Westfalia, 'Hammurabi'
Member: http://www.fullmoonbusclub.com/ "Home of the World Famous Breakfast
Burritos"
http://www.type2.com/rescue/
http://members.home.net/fullmooninjoon/index.htm