Date:         Tue, 1 Oct 2002 10:44:51 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Still doesn't add up,
              was:  Re: [Syncro] Oil pressure mystery, resolved???
Comments: To: Ben McCafferty <ben@KBMC.NET>
In-Reply-To:  <B9BF09DC.B5C5%ben@kbmc.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 10:14 AM 10/1/2002, Ben McCafferty wrote:
>OK, Bentley says the low pressure switch (between cyl 3 and 4) is .3 bar, or
>4.4 psi.  The high pressure switch (near the oil pump) is .9 bar, or 13.1
>psi.  This is all on page 17.7.  If that's true, my situation of 20 psi at
>2000 rpm still satisfies both pressure requirements, either just above or
>just below the magic 2000 rpm.

I believe there are some 1.8 bar switches out there, and my understanding
FWIW is that VW abandoned them because of too many "nuisance alarms" -- or
cynically translated out of marketspeak they decided that customer
complaints were more important than engine protection in the great scheme
of things.


>However, on page 17.9, in the test procedure for the oil pressure switch,
>the manual says "at 2000 rpm, pressure should be minimum 2.0 bar (29 psi)".

So it should, especially if the alarm is going to go off at 1.8... <g>


>So I still feel like I'm missing something.  If the requirement is 29psi,
>then my oil pressure switch should be setting off the light/buzzer a LOT
>earlier, because it doesn't do anything until 20 psi, and rarely at that.
>
>If the requirement is 4.4 or 13.1 psi, there's a ghost in the machine,
>because the engine never runs below 20 psi at 2000 rpm, and usually higher
>than that.

Your ghost will no doubt be screwed into a hole near the oil pump.  Try
replacing it.

david


--
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"