Date: Thu, 17 May 2007 10:24:37 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: oil pressure -- next round
In-Reply-To: <464BE21A.9090200@phas.ubc.ca>
Content-Type: text/plain; format=flowed
What viscosity oil are you using? This may have been mentioned but remind
me.
I doubt you have a blockage. The lenght of hose going to the guage will not
efect the reading unless you are actually flowing oil. It may delay the
reading but the final pressure reading is good.
Scratches in the oil cover is common. Dirt. Was it a new pump and housing?
You can check the housing for wear with a striaght edge and feeler guages.
The Bentley has the specs.
12.5 psi is almost .9 bar. While not quite the pressure that should be there
you are clsoe to satifying the switch, (.9 Bar). If you can get maintain 2
bar, (28 psi) at 4,000 rpm, you should be safe to run. These pressures are
an indication of loose mains or out of round rods or a missing/bad cam
bearing shell. Also, how are the vlaves adjusted? If you set the lifters
with clearance, you will have some excess flow there. They should be tight,
( touching + 1-2 turns) so that all oil flowing through has to get forced
through the rockers.
Dennis
>From: Thomas Pfrommer <pfrommer@PHAS.UBC.CA>
>Reply-To: Thomas Pfrommer <pfrommer@PHAS.UBC.CA>
>To: vanagon@GERRY.VANAGON.COM
>Subject: oil pressure -- next round
>Date: Wed, 16 May 2007 22:03:22 -0700
>
>Hi again,
>OK I am in bad luck i guess .....
>after I measured the pressure (I posted the readings a few days ago) I
>realized its really oil pressure and not electronics or other stuff. OK
>got the muffler off, got the tin sheet off (I really hate this f!@#$%
>sheet), and the engine support bracket. Unfortunately, the water pipe
>did not allow to unscrew the upper nuts completely, so in the end I had
>to get the pulley off and then the water pipe.
>
>I did not make any mistakes with the gaskets. Everything as it is
>supposed to be. BUT I do see quite obvious new scratches in the cover.
>Together with the bit of oil that I saw at the pump after I ran the
>engine a bit, it looks like I have some backpressure and a blockage
>somewhere. Any other ideas? Hm in cold run I got 55psi at 1000rpm. Only
>when it warmed up, I had 12.5psi at 2000rpm (and 3 meters of tubing
>before the gauge, which will drop the pressure a bit, but not that much
>I guess). Also that was still beofer the fan of the radiator went on,
>but the engine was quite hot already.
>
>I have to admit I don't know what to do any more. I just don't want to
>open the beast again ..... I checked all oil gallys with an air pump and
>felt air coming equally out of every opening. I could not sense any
>obstacle sitting somewhere. Also the indication of the new scratches on
>the cover rather show some backpressure than too loose bearings or
>similar. I sanded the old cover flat before I put it on (now I have a
>new cover ready to be put on). Also the scratches show that all areas
>are equally scratched, so i did not flatten it at an angle.
>
>Hope someone can help me. Oh man, I hope i could drive around now, and
>now it seems that all effort wasn't worth it (besides the gain in
>knowledge about these engines ...)
>
>I need rum now
>Cheers
>Thomas
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