I think the oil pressure valves can mess up in different ways.
The one that came installed on my SIV (1725 engine)was an early style and it
stuck. I cleaned it and it stuck again.
That valve and also the base plate was changed for a later steel style valve
which worked fine for a while.
Now apparently it also sticks. Sometimes my oil pressure gauge sticks at
some reading or another, other times it goes to zero but it comes unstuck.
It is a NOS steel valve, "best" one offered for Alpines.
I guess it needs inspection for a burr.
Allan
http://home.netcom.com/~aballard/
-----Original Message-----
From: alpines-bounces@autox.team.net [mailto:alpines-bounces@autox.team.net]
On Behalf Of jarrid_gross@earthlink.net
Sent: Monday, February 02, 2009 1:06 PM
To: Jan Eyerman; alpines@autox.team.net
Subject: Re: [Alpines] Oil pressure regulator valve
>Someone please correct my faulty memory, but I seem to remember a cause
>of low oil pressure after an engine rebuild was the failure to replace
>the samshaft bearings.
>
>Jan Eyerman
Oh it can be much more than that.
Any of the white metal bearings will reduce oil pressure if the clearances
are not to spec.
Additionally, there is an internal oiling pipe that pees oil on the cam
chain rubbing block that often is mis-assembled or downright missing that
can cause low oil pressure.
More often than not, its the bearing clearances, NOT the pump thats at
fault.
A messed up pressure relief valve will typically not develop sufficient oil
pressure at any RPM (since its dumping all the time), whereas bad clearances
or very worn pump will yield low oil pressure at low RPMs and will generate
the required 40 to 50 at some higher RPM.
When this happens, the oil pressure relief is NOT the main culprit.
Jarrid Gross
Alpines@autox.team.net
http://autox.team.net/mailman/listinfo/alpines
http://www.team.net/archive
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