Low oil pressure 200 20V
Michael at siliconoptix.com
Mon May 5 11:20:46 EDT 2003
When I had the 3B in my car rebuilt I had no oil pressure. In trying
to find the cause the pump, oil pan and oil filter were all removed
at least twice. We even tried packing the pump with gease in case
it was a priming issue. Nothing worked and I was ready to pull
the engine and send it back to the engine builder, turns out there
is a spring loaded check valve that holds oil in the head after shut off.
The valve is located behind the pressure transducers, so you can get
oil pressure in the bottom end with it stuck closed but no oil reaches
the head. Pulled the valve and it was gummed up, replaced it and oil
pressure is fine. It is possible this valve could stick partially open
limiting flow to the head/sensors, after a while, heat cycles, clean
oil and pressure from the pump it could start working normally, just a
From: Bernie Benz [mailto:b.benz at charter.net]
Sent: Monday, May 05, 2003 9:43 AM
To: SuffolkD at aol.com
Cc: 200q20V mailing list
Subject: Re: Low oil pressure 200 20V
There was no reason for nerviousness IMO, and your rebuilder did right by
you! A new, tight engine needs more oil cooling (more flow volume) for the
wear-in period than does an old dog. Any oil flowing thru the pump's
pressure relief valve due to excessive pressure is not available to the lube
system for oil cooling, filters not withstanding. Old dogs can at least
tollerate high viscosity oils, even if not needed for lube. As stated in
conclusion several days ago, "Low oil pressure is good, no oil pressure is
bad." Why apparently is the list hung up on an illigical desire for high
oil pressure? Nonsensical IMO.
> From: SuffolkD at aol.com
> I got 3 bar max when driving a rebuilt motor in an Avant with a Mann filter.
> I thought this was really low. 3 bar was above 3000 RPM. Start up was at or
> above 3 bar but when warm dial went to ~1bar at idle (800 rpm). Made me
> Changed the oil and (another Mann) filter at 1500 miles and used Dino 10/40W
> oil and bar is back to 5/4 Bar.
> I'll have to ask what oil he used in the rebuild and break-in period. I
> suspect it was very thin.
> -Scott in BOSTON
> In a message dated 5/3/03 9:50:23 PM Eastern Daylight Time,
> 200q20v-request at audifans.com writes:
>> My oil pressure gauge shows good oil pressure on start up, but then the oil
>> pressure declines while driving to work ~ 15 miles. The pressure settles
>> around 2 bar while driving and idle is around 1.8 bar. Am I loosing oil
>> pressure or is this sensor faulty?
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