[Vwdiesel] Re-ringing a Rabbit --Oil pressure test bad

[mikitka]

This is exactly my problem with oil pressure.  I get great pressure on start
up 70 psi using 15w-40 shell, once warmed up I get 8psi at idle and 20psi at
55mph in 5th gear. This reading from the oil filter housing port. The head
shows zero pressure after warm up. This is after a complete rebuild, new
everything except the head. It still has the original valve seals which had
40k on them, I'm a dumb A@@ for not changing them out. The machine shop
decked the head to make it flat due to it being out by .004  They looked
over the rest and said it looked good and it vacuum tested great so the
valves were sealing. I should have just had them do a complete head work and
been done with it but I wasn't thinking. The engine has new pistons, rings,
bearings and oil pump. So the low oil pressure is a mystery and the engine
has 3300 miles on it now running with low oil pressure. I installed the head
and followed the Bentley to the letter. Gasket is installed correctly,
torque bolts to specs everything. Could it be possible that the cam saddles
are worn excessively? Just a thought.
Don't mean to make this sound bad but it is good to see someone else out
there with the same problem. Maybe, finally this low oil pressure issue can
be solved.
I have light smoke blue in color out the exhaust, but only after the engine
is warmed up, at least it seems that way for the most part, don't notice it
much on initial cold start up and run till warm. I do get black smoke under
heavy acceleration, even thought this is an ECO diesel. I wonder if my cat
is shot now?
Nick




-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of Bart Wineland
Sent: Monday, October 18, 2004 10:01 PM
To: vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] Re-ringing a Rabbit --Oil pressure test bad

I need to clean the engine off again to see where the oil is leaking from. 
When I could see the oil bubbling around the exhaust flange donut while it 
is running my first thought was it was from oil getting by the rings into 
the exhaust and thought that may explain the heavy white/gray smoke and low 
oil pressure also. But that oil could have come from when I had the valve 
cover off?? Wouldn't blow by cause a loss in low oil pressure?  It does 
tango alright. From a high of 70 psi with a cold engine (about 40 degrees 
outside) to under 10 psi after it warms up for 12 minutes. I did use old 
cut off head bolts with slots filed in them (per archives) to keep the head 
gasket aligned. It is a hydraulic head with the extra oil port so the 
gasket can't go on upside down. Torqued it according to Bentley in sequence 
I think 30# first pass, 40# second, then with just a breaker bar for the 
final pass, although Bentley calls for an additional 1/2 rev. on each bolt 
I could not get that. Maybe 1/4 rev. I was sure the headbolts were going to 
twist off. I forgot to mention that the oil pump was replaced last fall 
before all this started also, so it only has 9 or 10k miles on it and oil 
pressure was not a problem before I pulled the engine and fixed everything 
:)   Pressure at the pump sensor? You mean the sensor at the filter?
"Don't you give up."  You guys make that pretty hard.

Thanks,
Bart


At 08:21 PM 10/18/2004 -0400, you wrote:
>It would seem to me that oil pressure, oil leaks and blowby are three
>completely unrelated items.  Does your oil pressure tango?  How low does 
>it go?
>(warmed up and idling?  Did you use cut off bolts to keep the head gasket 
>in place?
>  How 'bout pressure at the pump sensor?  Don't you give up.
>Andrew
>P.S.  I once had an engine Sieze approx. six months after complete rebuild.
>Started it up backed out the driveway, first gear, went to shift into
second,
>stalled.  That's wierd she never stalls!  Click, click went the 
>started.  0 to
>very bad day in 1 second.  Aparently a little piece of aluminum (not a
diesel
>VW) from the align bore had finally made it to the crank bearing.  (Why
>didn't the pressure washer blow it out of the gallery?) Pinch.  I bet if I 
>had been
>under load I might/might not have felt a hiccup before it clearanced
itself.
>Buffed the aluminum off the crank.  It didn't even leave a mark.
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