On the air cooled engines, the oil pressure switch is before the filter. You
will not fix the light with a filter. The proper filter for that engine does
not even have any valving in it. No anti drain back or bypass. The bypass
valve is in the adapter on the engine. 

Did you remove that big sump cover and check/clean the screen? Is the wire
to the switch good and in place? Ignition on, engine off, light should be
on. Start engine light goes off. If light turns on while engine is running
you either have low oil pressure, bad switch, disconnected/shorted wire. I
say disconnected as the lose connector end could be hitting the engine
causing the light to flicker. 

These engines are noted for oil pressure problems. The cases warp, the cam
tunnels get messed up, etc. Check the oil pressure with a mechanical gauge. 

 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Joseph Dor�
Sent: Sunday, September 27, 2009 1:35 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Oil Filter & Oil Pressure - 1982 A-C M/T Vanagon/Westfalia

Hello again.

As somewhat of a follow-up to my first post, I have discovered what
may be the cause of my oil pressure problem.

It seems the correct filter is a Mann 920/17.  I was given a Mann 719/5.

I don't know anything about oil pressure.  Would an incorrect filter
cause the warning lamp to illuminate? What, in the design of the
filter, causes a variance like that?

Thanks,
Joe