Date: Wed, 14 Jan 2004 23:05:31 -0500
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: lets talk about oil pressure issues
In-Reply-To: <20040115025339.81116.qmail@web9402.mail.yahoo.com>
Content-type: text/plain; charset=us-ascii
You have a combination of a slightly worn engine and too low an oil
viscosity. Due to the oil to water heat exchanger and the design of the
engine, outside temperatures have little effect on oil temperature after
things warm up. This is where the advantages of synthetic oils shine.
The 2200 rpm is critical because that is where the Dynamic Oil Pressure
Warning Systems switches to check for adequate oil pressure at the high
pressure switch. This is the switch located on the back of the engine,
under the water pump. The correct switch is .9 bar (12.7 psi). Some
books list the switch as 1.8 bar, this is incorrect. The switch is
actually in the oil path after the pump but before the filter. If the
engine is healthy, the oil cool and the correct viscosity, it should
maintain ~10 psi/1,000rpm. If you are holding 6 psi/1,000, then things
are marginal and the light/buzzer will work as you describe. Here are
some things to check.
1) Make sure oil level is correct. DO NOT OVERFILL. The top mark on the
dip stick is MAX, not FULL. A slightly lower level will keep the oil
cooler at high engine speeds.
2) Make sure water is flowing through the oil cooler. I've seen the
hoses clog with crud.
3) Try a different viscosity/brand/type of oil. A 15w-40 is more
appropriate unless temps get well below 0. Synthetics have a very wide
operating range. I use the Mobil 1, 15W-50 all year and it has been
tested by me at -10 in Vermont. At 212K I still have 40-50 psi at
highway speeds.
Hope this helps,
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of brian M.
Sent: Wednesday, January 14, 2004 9:54 PM
To: vanagon@GERRY.VANAGON.COM
Subject: lets talk about oil pressure issues
Specifically on 90 Vanagons!
Im running 10w30- its in the 20s where I am at.
Once the van is good and warm I can be driving at 60mph, about 3000 rpm-
no problems.
BUT when coasting to a stop,the warning lite goes on at 2200 rpm.
It will go off if you blip the throttle above 2200 while in drive.
Or- if you coast all the way to a stop- the buzzer and lite stay on.
But if I put it into nuetral, blip the throttle over 22oorpm, and let
it idle down it wil stay off !!!
2200 rpm seems to be the magic number.
Whats up with this??
I never had the problem with 20w50-well only rarely.
So what do you think? Sending unit? Module? Bearings? Lobotomy?
Whats the general consensus?
Thanks in advance!!
Brian
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