RE: Oil Pumps

[Richard Hudson <richard.hudson@domain.elided>]

Hi Al

You are right about the "just one worrying thing" they just seem to
queue up and present themselves one at the time..

Your oil pressure sounds fine, I rebuilt my engine nearly 5,000 miles
ago. I made the mistake of refitting the Saab high pressure pump, based
on suggestion from a specialist. I was getting 80psi at cold regardless
of RPM and when hot I was pushing 50psi at idle and 65psi at anything
above 1000rpm.. I ran it like this for a couple of thousand miles before
it started to spring oil leaks... 

Tony Hart said that I was limiting the life of my chain tensioners and
crankshaft. So I put in the standard pump again. Now I get 45-50 psi
when cold at 750rpm and 55-60psi at anything about 1000rpm. When hot I
get 25psi at 750rpm and as soon as I let go of the brake pedal it moves
up to about 35-40psi, I get a peak oil pressure of about 45-50psi. at
anything above 3000rpm..

But as has been stated before high pressure is not necessarily good for
the engine, oil flow and regular changes are...

Do you know how old the oil pump is? When were the chains and tensioners
last changed?

Re having Holden Eaton stamped on the pump, I don't know. I think my
standard pump came in an AE box..

I am thinking about loosing the oil pressure gauge off the dashboard and
re-fitting the clock as I think it would be more useful also I would
probably spend less time looking at it and more time enjoying the ride..

Incidentally when I was gauge watching with my old knackered engine, I
noticed that when warm, if I coasted in drive and then pressed the
accelerator the oil pressure would dip by anything upto 10psi. I turned
out that three of the five main bearing caps were broken and the centre
main bearing was a shadow of it's former self.. Anybody else have
experience of this...

Regards

Richard Hudson
73 Auto White Stag

	-----Original Message-----
	From:	AlFos@domain.elided [SMTP:AlFos@domain.elided]
	Sent:	15 September 1998 23:26
	To:	stag@domain.elided
	Subject:	Oil Pumps

	Hi All, 

	Well I did some work on the oil system at the weekend.  The
original filter
	housing stayed after your advice but it, transfer housing and
pump all got new
	seals/O rings and hopefully I'll now drip less oil.

	One worrying thing though (isn't there always?).  HRS service
video tels me
	that my oil pump should have HOLDEN EATON stamped on the
pressure relief valve
	housing.  Mine does not and according to the vid this indicates
a Saab pump
	which may lead to too high oil pressure.  I have a pressure
guage fitted and
	on start up it reads alittle over 50 psi when driving and about
40psi at
	tickover.  When hot this changes to 50 driving and 15 tickover.


	Is this a problem?  Should I change the pump?  could it just be
a re
	conditioned pump?  Will the pressure relief valve operate anyway
so it doesn't
	matter?

	Advice gratefully recieved.

	Al