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[Healeys] Bn2 excessive oil pressure

Subject: [Healeys] Bn2 excessive oil pressure
From: ah at jharper.demon.co.uk (John Harper)
Date: Sun, 22 May 2011 18:29:58 +0100
References: <236CD2DB-5DA5-4F79-A208-A604354A2BA6@yahoo.com> <727252398.614860.1306071541303.JavaMail.root@sz0054a.emeryville.ca.mail.comcast.net>
One rather obscure problem that can cause the bypass valve not to open 
is if a hole in the sump gasket is not cut or for some other reason 
blocked.

There is a service sheet on this somewhere but take it from me that some 
gaskets used on later 2.2 or 2.5 litre engines did not have this hole 
cut. All that should happen it that the small amount of oil that gets 
past and behind the valve is supposed to bleed away through this hole 
into the sump. If the back of the valve is blocked this forms a solid 
plug of oil behind the valve and stops it performing as it should.

Regards

>
>Regardless of the filter, the oil pressure relief valve should limit 
>the pressure to a maximum of (typically) 60-70psi.
>
>30psi @ 1,000rpm is great, but 90 @ 4,000 seems too high; the obvious 
>culprit would be the valve, but I can't explain how just changing the 
>oil and filter would instigate the problem (unless, maybe, you went 
>from 20W break-in oil to straight 60W). Definitely check the valve for 
>burrs, etc.; maybe try a different spring.
>
>Sounds like your rebuild was good--most issues are with too low 
>pressure--but too high puts undue stress on the cam/distributor gear 
>and seals.
>
>Bob
>
>--------------------------------
>Bob Spidell - San Jose, CA
>
>
>
>After the engine rebuilt I had normal oil pressure 20-30 at 1000 rpm and 40-50
>At 4000 rpm.
>Using the spin oil filter adapter from moss and the cheap fram spin on oil
>filter (moss # 235-880)
>After an oil and filter change this week I get 30 at 1000 rpm and 90 at 4000
>rpm and 100 at 5000 rpm. I changed the oil spin on filter to the K&N (moss #
>235-830).
>Any ideas,
>
>Jose
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-- 
John Harper

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