Date: Sat, 4 Apr 1998 03:20:26 EST
Reply-To: SyncroHead <SyncroHead@AOL.COM>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: SyncroHead <SyncroHead@AOL.COM>
Subject: Re: Vanagon 2.1 Oil Pressure
Content-type: text/plain; charset=US-ASCII
In a message dated 98-04-03 23:44:15 EST, KENWILFY@AOL.COM writes:
> I don't have the Bentley so could somebody help me out. What does the
manual
> give as oil pressure range for a 2.1l motor? Give me RPMs and temperature
> please. Thanks
The operation of the Dynamic Oil Pressure System is described in Bentley
section 90.
The operation of the oil pressure switches is described in Bentley section 17.
I use the term "described" here pretty loosely here, because they do a very
poor job.
The dynamic oil pressure monitoring system gets inputs from two pressure
switches. One switch is closed with no oil pressure and opens when oil
pressure rises to about 0.3 bar, called the .3 bar switch. The .3 bar switch
is located between the left (driver's side) two cylinders.
The other switch is open with no oil pressure and closes when oil pressure
rises to about 0.9 bar, thus called the .9 bar switch. The .9 bar switch is
located below the water pump & crank pulley, near the oil pump.
The monitoring system seems to only "look at" the .3 bar switch below 2000 RPM
and ignore the .9 bar switch. Above 2000 RPM the active switch is the .9 bar
switch while the .3 bar switch is ignored. Below I've described a properly
operating monitoring system. Note that I say "monitoring system" because some
of the conditions describe an abnormally low oil pressure condition.
A. Ignition ON, engine NOT running -- or -- engine running at LESS than
2000RPM
.9 bar switch is ignored
1. Low oil pressure exists (below .3 bar), keeping .3 bar switch closed
Oil light: Flashes
Buzzer: Silent
2. Normal oil pressure exists (above .3 bar), opening .3 bar switch
Oil light: Off
Buzzer: Silent
B. Engine running at MORE than 2000RPM
.3 bar switch is ignored
1. Low oil pressure exists (below .9 bar), keeping .9 bar switch open
Oil light: Flashes
Buzzer: Sounds
2. Normal oil pressure exists (above .9 bar), closing .9 bar switch
Oil light: Off
Buzzer: Silent
There does not appear to be a condition in a normally operating monitoring
system when the light should be on steady.
I hope this helps.
Jim Davis
87 GL Syncro
88 GL Wolfsburg