[Healeys] Bn2 excessive oil pressure

Per Schoerner healeyguy at bredband.net
Sun May 22 15:30:22 MDT 2011


Hi
I suggest you check that hole in the sump gasket that John Harper 
suggests. This is the escape route for the excess oil. If that hole is 
not open no oil will pass by no matter what the pressure is.
So, drop the pan and check the gasket.

Per

John Harper skrev 2011-05-22 19:29:
> 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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