Date: Tue, 10 Aug 2004 09:12:56 -0700
Reply-To: David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject: Re: 1.9 turbo diesel oil pressure
In-Reply-To: <002a01c47eba$c2210fe0$6401a8c0@ALAN7MVIPDUAX2>
Content-Type: text/plain; charset="iso-8859-1"
VWs specs are 0.3 BAR at idle and 1.8 BAR at 2000 RPM. This is the specs
for the dynamic oil pressure system that they have. 1 BAR = 14.5LBS which
makes it appear that you engine is at the limit.
I do have to question two things though. What filter are you using? I
would only use Bosch or Mann. Second I have never seen Diesel oil 20w50
weight. Make sure you use an engine oil that is API CH-4 or CI-4 rated -
this is usually 15W40 oil. To be really technical you need to run Synthetic
according to VW - I don't in mine, 15W40 API CH-4 is all I run. With our
running a CH-4 or CI-4 oil you are lacking the detergents necessary for the
Diesel soot and this is not good for the motor or turbo.
Replace the filter and oil and see if the problem persists.
David Marshall
Fast Forward Automotive Inc.
4356 Quesnel-Hixon Road
Quesnel BC Canada V2J 6Z3
http://www.fastforward.ca mailto:sales@fastforward.ca
Phone: (250) 992 7775 FAX: (250) 992 1160
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-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of Alan Pickersgill
Sent: August 10, 2004 2:17 AM
To: vanagon@GERRY.VANAGON.COM
Subject: 1.9 turbo diesel oil pressure
I'm having trouble with the oil pressure light and buzzer coming on.
I'm wondering if the collected wisdom of the list might know if this is
because of over-sensitive oil pressure senders?
Could it have anything to do with the type of oil filter being used? I
remember debates about oil filters and pressure on vanagon engines. Does the
wrong filter make pressure low or high?
Any guidance would be appreciated.
The background info -engine is a low mileage turbo diesel (140, 000 km) with
new 20W50 oil and filter and a brand new pump. Rod and main bearings have
been inspected by a couple of experienced mechanics. No apparent damage
despite 3 episodes of the light coming on.
Light and buzzer comes on only when engine is hot (normal operating
temperature) and after working fairly hard 3,500 -3,750RPM for five minutes
or more. Then comes on when the RPM drops - coasting to a stop at an
off-ramp. On another occasion came on when the rpm fell below 2,000 after
cruing at 3,500 or more. Then when RPM went back above 2,000 it went out.
I've installed a Hastings electronic oil pressure gauge and it agrees quite
closely with the mechanics gauge.
I get 29psi at 2,000 rpm and it goe up from there.
Below 2,000 rpm it falls quite low 5psi at 1,000 rpm and even lower at idle
800rpm.
Pressure at cold is 75psi or more.
I don't think this should make any difference but this engine is out of a 93
Jetta turbo diesel and is now in a 93 passat turbo diesel.
Alan
