Date: Wed, 11 Aug 2004 23:15:43 -0400
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: 1.9 turbo diesel oil pressure
In-Reply-To: <002a01c47eba$c2210fe0$6401a8c0@ALAN7MVIPDUAX2>
Content-type: text/plain; charset=us-ascii
Something is wrong for the oil pressure to fall below 20 psi on these
engines. Get an infrared temp gauge and see how hot the oil is getting.
Aim the gauge at the oil filter or oil pan. Maybe you are not getting
good water flow through the oil cooler. Another possibility is the head
is damaged where the cam shaft sits in it. There are no bearings here.
If the timing belt was ever over tightened, the head will be damaged. I
have seen the belts made so tight that the cam shaft snapped. Since the
pan has been removed to check the bearings, I'll assume the oil inlet
screen is clear. Many of these engines have piston squirters. Maybe one
is missing. The oil pump could also be defective.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Alan Pickersgill
Sent: Tuesday, August 10, 2004 5:17 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
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