I just changed the oil filter to a 4 dollar one and the same thing.......
Sent from my iPad
On May 22, 2011, at 12:29 PM, John Harper <ah at jharper.demon.co.uk> wrote:
>
> 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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