Date: Mon, 7 May 2007 22:39:24 -0400
Reply-To: Dennis <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis <d23haynes57@HOTMAIL.COM>
Subject: Re: oil pressure
In-Reply-To: <463F6758.2050509@phas.ubc.ca>
Content-Type: text/plain; charset="iso-8859-1"
Unless the relief spring and piston is extremely loaded with crud, it does
not fail. The 2,600 rpm vs. 2,000 rpm buzzer issue is strictly an
electrical issue with the dynamic oil pressure board and I have seen a
number that operate at that RPM. My guess is that there was a revision at
some point to quiet the noisy buzzers.
A healthy engine should be able to maintain ~ 10psi/1,000 rpm. If you
can’t hold .9 bar at 2,000 or 2,600 rpm, something is wrong. Since you are
having trouble once warm you have to consider viscosity, temperature, a
clogged inlet screen or excessive clearances somewhere. You need the test
the oil pressure with an oil pressure gauge. You need to check the relief
valve with a cold engine ant them map oil pressure a various oil
temperatures and engine speeds.
If the oil pup has a gasket between the pump body and cover, and that
gasket is not so thin as to rip by merely looking at it, you have the
wrong gasket there.
What level is the oil filled to? Any chance it is too high. At or above
the top mark on the dip stick is too much. Is water flowing through the
oil cooler? What is the coolant and oil temps. Without using an oil
pressure gauge and doing some real diagnostic testing, you only grasping
at straws and hoping for a miracle.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Thomas Pfrommer
Sent: Monday, May 07, 2007 1:52 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: oil pressure
David Kao wrote:
> --- Thomas Pfrommer <pfrommer@phas.ubc.ca> wrote:
>
>
>> Actually i do not get a blinking, meaning even with a hot engine and
>> idling now warning occurs. With a cold engine the same, and also when i
>> rev above 2600 rpms everything is fine. BUT when the engine is hot and
I
>> rev above 2600 at some point, not right away the buzzer+warning light
>> gets on. A small tip on the accelerator to bring the engine at about
>> 2800 stops the buzzer/warning light. Going then back to idle no
>> blinking occurs. I believe that there is certainly a low oil pressure
>> problem, as at 2600 or 2800 the pressure is not supposed to be around
>> 0.9bar but rather 2 to 3 bar. I am certainly above 0.3bar while idling.
>> The 0.9bar switch is new. What is strange is that the change from the
>> 0.3bar switch to the 0.9bar switch occurs at 2600rpm and not at 2000. I
>> tested it by disconnecting the cable to the 0.9bar switch.
>> Thanks
>> Thomas
>>
>
> Thomas:
>
> So it is unrelated to overheating. Have you checked your oil pressure
relieve valve?
> If the sping is stuck and compressed you will get constant low oil
pressure.
>
>
I changes the spring last week as I also thought this is the problem.
However I am not sure if it is stuck ... how can i tell? the piston came
out nicely when I changed it and I cleaned everything and put it back
together, with the groove being farther away from the spring .... I hope
that was the right direction ... the bentley for the 2.1l 87 does not
show which site of the piston faces upward, but for the air-cooled it is
shown nicely and i assumed it will be the same way. that means the
spring connects to the outer ring of the piston and it is hollow at the
spring site. The piston is flat facing the engine ... makes sens to me...
aaarrrgggghhhhhh I am running out of ideas what it could be WITHOUT
talking the monster out/apart again NNNOOOOOOO!!!
Thanks
Thomas
> Overheating and rod bearing clearance problem will cause blinking
warning light.
>
> David
>
>
>
>
>
>
__________________________________________________________________________
__________
> The fish are biting.
> Get more visitors on your site using Yahoo! Search Marketing.
> http://searchmarketing.yahoo.com/arp/sponsoredsearch_v2.php
>
