Bill:
THere is a phenomena that occurs in these engines, in which oil pressure
does drop somewhat over about 3000 RPM. I dont know why. Normal running hot
oil pressure is 40-45 psi. I will never assemble any engine without using
plastigauge on ALL rod and main bearings. New is not always correct.
Did you rebush your rocker arms and install a new rocker shaft? This is a
major cause of low oil pressure.
Good luck:
SKip...............At 10:56 PM 2/18/98 +0000, Bill and Heather Putnam wrote:
>> I doubt that it is the adaptor. I would check the seal between the pan and
>> the block, where the oil pickup routes the oil. Also where the pickup
>> attaches to the pan. If you get an airleak at these points, it is trouble.
>> Did you plastigauge the bearings when you installed the crank? Did you
>> check all the oil passages in the crank? What kind of oil pressure are you
>> getting?
>
>Skip,
>
>I will check the pan next if the filter doesn't do
>the trick. We did not plastigauge the bearings, but
>they were original Vandervell with a new Moss crank.
>
>The oil pressure is 65 psi cold on start up. Once
>the engine is warmed, it is 60 at 2600 rpm but then
>drops to about 38 at 4000 and goes up to about 42
>at 5200 or so. let the revs drop to 2600 and it goes
>right back up to 60. So I don't think it's the bearings
>or pump capacity-usually oil pressure goes up with revs.
>I'm thinking that the bypass valve may be acting for
>some reason, or there could be cavitation, but there
>is no foaming evident.
>
>I'll let you know if I find anything.
>
>Thanks,
>
>Bill
>
>
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