Date: Thu, 21 Jul 2016 19:55:02 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: 1991 Carat - the drama continues
In-Reply-To: <CA+az7_77o9N7_2Jb-=gW0KKArcPpVAoo24qVaB1Ne51pX4A5YQ@mail.gmail.com>
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It would be very rare for an oil pressure switch to completely fail out of the box. I've seen them be way out of tolerance not yet one that didn’t work at all. It is possible that you really have a wiring issue and that moving stuff made the system work for now. This is usually the case when someone thinks they fixed an operating problem by replacing the temp 2 sensor. Simply wiping the contacts or moving the wires where crimped in those connector terminals did the fix.
The connector for the oil pressure switches on the left side of the engine tends to corrode and make a very high resistance connection causing false oil pressure alarms. A bad engine ground can also cause a back feed triggering the system to falsely alarm. Using a meter a real diagnoses could have been made without simply changing parts and seeing what happens. Who knows, maybe you have a switch that was operating at the high end and that engine has an oil pressure problem.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers
Sent: Thursday, July 21, 2016 9:38 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: 1991 Carat - the drama continues
No, what I'm saying is, a brand new switch failed right out of the box. I supplied the new switches - and a new thermostat - to the shop. They were quite old, having been gifted to me when a local VW shop closed. I was gifted many genuine VW parts. Though old, but still in the original boxes, I saw no reason not to use them. That one switch failed. New out of the box failures are not new to me. I once had a new piece of avionics navagational gear that cost $5000 fail on the first flight after installation only 10 minutes from the airport after departure. Frustrating to be sure. But an easy fix by exchanging for another new one. Took a little time to R&R the thing. But other than that, no problem. Same with tne switch.
John
On Jul 21, 2016 04:03, "Frank Condelli" <RAlanen@aol.com> wrote:
> Soooo, what you’re telling us here is that your shop rebuilt
> and installed an engine and did not install NEW $6.95 oil pressure
> switches and make sure the wiring to those two switches are in PERFECT condition.
> Better tell us the shop to avoid !
>
>
> > On Jul 21, 2016, at 12:00 AM, Automatic digest processor <
> LISTSERV@GERRY.VANAGON.COM> wrote:
> >
> > Finnaly got the new engine installed, tested and everything seemed
> > to run fine. Water was used for cooling while testing. Drained it
> > out today, dragged out my bong filling devise, and proceeded to fill
> > the system with
> > 50/50 mix of glycol and water. Once filled, I took it out on
> > Interstate
> 20
> > eat of birmingham for a test run. Couldn't have asked fo better
> > performance. As I rxited the highway at a cloverleave, my heart
> > sank! As the van slowed the oil light came on with the warning horn.
> > What tne
> heck!
> >
> > There was a big grassy area in the cloverleaf, and I coasted to stop
> > out
> in
> > it. I was puzzled. I waited a few minutes, then started again.
> > Goosed the throttle up a bit, and as the rpm dropped the oil light
> > came on again an the horn sounded. Little bells started ringing. I
> > thought, lets try this again, but take the rpm to 3000 rpm. I
> > started the engine, held at 3000, and the oil lighT DID NOT come
> > on.as I let off on the gas, and as the
> rpm
> > hit 2200, the alarm sounded and the light came on. Aha, I thought,
> > I've
> got
> > you now! Dynamic oil pressure fault. Started the engine, held it at
> > idle
> -
> > no light and alarm. Push the rpm to2000 and held, still no alarm an
> light.
> > Increased rpm to 2500, no alarm, no light. Let off on the gas and
> > whenn
> the
> > rpm dropped to 2200 the light came on and the ala3rm sounded.
> > Definitely that dynamic oil pressure system! Drove it back to the
> > shop at 2000 rpm
> and
> > under. No problem, no light, no alarm.
> >
> > Tomorrow it gets a new switch!
> >
> > Hopefully the vehicle will be ready then for the rest of it's
> > restoration
> >
> > John
>
> Cheers,
>
> Frank Condelli
> Almonte, Ontario, Canada
> '87 VW Westy, '00 Kawasaki 250 Sherpa, "98 Ducati 750 Monster & Lionel
> Trains (Collection for sale <http://frankcondelli.com/trainsal.htm>)
> Frank Condelli & Associates <http://www.frankcondelli.com/> -
> Vanagon/Vanagon Westfalia Service in the Ottawa Valley BusFusion
> <http://www.busfusion.com/> a VW Camper camping event, Almonte, ON,
> June 02 ~ 05, 2016
>
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