First time I've had to look at the list in DAYS... Sorry to chime in so
late. Stan, the ball/spring arrangement in the OE filter mount is a relief
valve that allows oil to bypass the filter in the event of filter
restriction or VERY cold weather. This relief valve should be PLUGGED when
installing the sandwich adapter. The sandwich adapter has its own relief
valve, which has a tougher spring and therefore a higher relief pressure.
This is necessary because line resistance in the oil hoses and cooler(s) can
raise the pressure enough to cause the OE relief valve to open and oil to
bypass the cooler. We use a shallow 5/8" freeze plug, pressed directly into
the opening for the OE valve, from the bottom. We just tap it in with a
drift. This plug used to be part of the kit supplied by manufacturers of oil
cooler kits like RVEECO and Gandalf's Garage. It's available at any good
FLAPS.

Regards -

Coby Smolens
Valley Wagonworks
VW Bus and Vanagon Specialists
"Intimately acquainted with VW Vans since 1959"
1535 SF Drake Blvd, San Anselmo, CA 94960
415-457-5628

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM]On Behalf
Of Stan Wilder
Sent: Thursday, September 20, 2001 5:09 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Sandwich oil cooler adapter question

I just finally got around to installing the axillary oil cooler on my  83
Westfalia Air Cooled.
I installed the additional cooler by using an Empi sandwich type adapter
that goes between the oil filter and the original filter mount.
I've got a question:
I noticed that the sandwich adapter and the original oil filter mount
both have check valves in them. Does this dual check valve scenario
present any problems?.
Seems to me that they would hardly ever even get into sync except at high
pressure.

Stan Wilder
83 Air cooled Westfalia
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