Bill/Ken/Jerry
Many thanks for all your responses on this topic.
I know the rocker arm wear was viewed as negligible at rebuild but the Cam
bearings were not changed even though the cam was - I don't know why. I
suspect a change of cam could introduce a wider tolerance and will discuss this
with the rebuilder.
On the subject of the filter, I have a spin-on filter on this car so should not
have the problem Bill described. However, one area I am considering is that I
changed the brand of filter I use. Prior to the rebuild, I used the Mann
(German origin) filters but changed to the Unipart Premium (GFE 22) filter as
sold by D Welch and SC Parts. Anyone have any views in these products?
I will be checking the oil pressure release valve and spring as although it was
not touched during the rebuild something may have affected its operation in
some way.
I realise I should have titled this email 'Lower oil pressure' as some have
wondered what the problem is in the first place with the figures I gave. I
suppose its a matter of expectation. I was expecting the oil pressure to at
least stay the same or have a marginal increase, rather than the reduction I
have now.
Hopefully will get to the bottom of this without resorting to another rebuild!!
Paul
INSPTWO@msn.com wrote:
Paul:
This may sound stupid, but it happens more than people want to admit. Check all
the rings, etc from your oil filter. A missing or wrongly placed item in that
#^&*filter holder has caused numerous folks to have their oil presssure drop.
Regards,
Bill
BJ7
----- Original Message -----
From: Paul Baker
Sent: Wednesday, December 08, 2004 1:04 AM
To: healeys@autox.team.net
Subject: Low oil pressure
After 3 years racing and 12,000 competitive miles (not all by me), I thought I
would treat my BJ8 to an engine rebuild. Prior to the rebuild, the engine used
a little oil and smoked a bit on overrun, but the oil pressure was 4 bar (60
psi) cold tickover and 2 bar (30 psi) when hot and on tickover. I have always
used Castrol RS 10-60 (fully synthetic). During the rebuild the main and big
end bearings were replaced although there was very little wear to the old set,
the piston rings were changed, the oil pump was replaced for a new D. Welch
h/c pump (due to excessive wear in the gears of the std BJ8 pump) and the cam,
valve springs, seals and bucket followers were replaced (valve guides were
fine). Overall the engine was in very good condition.
I have since run in the engine using Castrol No 2 running-in oil for the first
300 miles and replaced it with a 10-40 mineral oil for the next 500 or as many
miles as I can get on it before the next race season starts, when it will be
replaced with Castrol RS 10-60.
The problem is that the oil pressure since the rebuild and is now 3 bar (45
psi) on cold tick over and 1.8 bar (26 psi) when hot. I can't see that this is
going to improve greatly when I replace the 10-40 with the 10-60. My engine
rebuilder is somewhat baffled by this outcome. We plan to check the oil
pressure relief valve but this was not touched during the rebuild but what else
could be causing this problem?
As always, any suggestions greatly appreciated.
Paul
66 BJ8 works rep
67 BJ8
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