[Vwdiesel] RE: re riniging rabbit oil pressure bad

Tue Oct 19 10:53:13 EDT 2004

 Align hone must be done on the cam journals if the head is milled. If cam
journal on two different camshafts is the same size, it is the same size-
one fits where the other did.
Head warpage is just that, the whole head warps, including the cam journals.
Mill the cylinder side off, so it's flat, then the cam journals will usually
describe an arc instead of a straight bore. So then the cam caps are milled
so the hole is smaller, and the journals aligned by cutting a fresh bore.

For the cam bearing clearance to be so bad that it's using up all the oil
volume, it would rattle and clatter loudly, and if you missed the noise your
next clue would be the holes the cam leaves as it's pieces exit the valve
cover...
As long as you re-used the bearing caps on the original spots, and the cam
journals are measured to be the same size, you are fine in that regard.
-James

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
Behalf Of Bart Wineland
Sent: Tuesday, October 19, 2004 7:40 AM
To: greg rich; vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] RE: re riniging rabbit oil pressure bad

Oh no.  Replace camshaft? Yes I did, line bore? No I didn't.  The guy that
rebuilt it originally 25k miles ago broke away the cam slot where the lock
plate goes. I took the cam from my original low mileage 69k engine and
thought it fit just perfect and thought myself pretty handy. I did measure
the journals as careful as I could with mics. and they appeared identical
but sounds like it is not that simple? I re-used the bearing caps that were
in it. I think I am taking my lumps for being a bonehead.
thanks,

Bart

At 09:01 AM 10/19/2004 -0400, greg rich wrote:

>Did the intermediate shaft bearings get changed? -both?)
>my neighbour had a machine shop rebuild his 1.9 td and they didn't change
>them, exactly the same situation, lots of cold oil pressure, non when hot,
>he lost his turbo very soon afterwards...
>It took three times for them to figure it out (re and re engine). They
>would not admit to it being there mistake. They kept saying they installed
>a new oil pump, sure it was new but no markings on it (was it meant for a
>turbo diesel?) as they are larger pumps.
>
>I don't think your head can cause low oil pressure like that UNLESS you
>changed the camshaft and the bearings don't match-the cams are not
>interchangable without a line boring to match them.
>
>
>Most machine shops that are not familar with VW never know about those two
>bearings inside there.
>Check over your bills and see if they were done
>Greg
>
>
>Re-ringing a Rabbit --Oil pressure test bad
>
>>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.
>
>
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