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Re: Not Again!!!!! MGB disaster

Subject: Re: Not Again!!!!! MGB disaster
From: "Scott Gardner" <>
Date: Mon, 13 Oct 1997 01:10:31 +0000
> Scott, your oil pressure should be 70-75 lbs.  If you had a new pump and
> you are only getting 55 lbs pressure there is (was) a problem.  I would
> suspect the crank was bad and damaged the bearings or the  bearings were
> set too "loose".  I don't think that 55lbs works.
> My car has about 75 lbs at speed (any speed) and 55 lbs pressure at idle.
>  I have a stock oil pump and the standard relief spring.  12,000 miles on
> rebuild.  Castrol 20-50, and any kind of oil filter as long as it isn' t
> Fram.

        Thanks for the hard numbers.  I'm kind of leaning towards a bum 
relief valve spring as the cause of the low oil pressure.  The fact 
that my oil pressure was 55 psi everywhere from idle to 4200 rpm 
leads me to believe that the pump was doing its job, and that the 
relief valve was opening too soon, keeping pressure down at a 
constant 55 psi.
        Are there parts to the relief valve assembly that wouldn't have been 
included with the purchase of the new uprated spring?  The reason 
I'm wondering is that my old stock one seemed to be relieving at 55 
psi also.  Perhaps a related part is keeping the new uprated spring 
from working properly.  
        I'm going to ask him to take any machining work to a different shop 
this time, even if it costs me out-of-pocket.  The machine shop that 
did this work messed up on the crank once (too tight), and I'm afraid 
they may have overcompensated the second time.

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