Thomas,
On my 70B, I had a similiar reading as yours . So, I change the main
bearings while the engine was out for a transmission swap. The oil pressure
the past three years since the change, has been 55lbs at start up and 45lbs
when hot at idle.
Jim
70B
69C
>From: "Thomas J Pokrefke" <pokrefke1@comcast.net>
>Reply-To: "Thomas J Pokrefke" <pokrefke1@comcast.net>
>To: <mgs@autox.team.net>
>Subject: RE: Oil Pressure Question
>Date: Sun, 28 Mar 2004 10:05:14 -0600
>
>Did a little more testing. At cold startup, the oil pressure was 55lbs @
>idle.
>
>When temp guage was 1/2 way between "C" and "N", the pressure was 40 @
>idle.
>
>When temp guage was at "N", the pressure was 35 @ idle.
>
>After a quick spirited drive, the pressure was 13 @ idle.
>
>Would this fit the bill for a relief valve that has failed?
>
>Thomas Pokrefke
>1970MGB
>pokrefke1@comcast.net
>http://www.pokrefke.com
>
>
>
>-----Original Message-----
>
>
>
>After warmed up (measurements taken after a 15 mile high speed tollway
>trip), my MGB shows about 10psi for each 1,000 prm while driving. This
>holds true for idling as well: i show about 10psi for an 950rpm idle.
>
>Does this seem low? The oil is 20W-50. The main and rod bearing were
>replaced about 10,000 miles ago, I don't suspect these to be the problem.
>Does this sound like a potential problem with the oil pump or maybe a stuck
>pressure release valve???
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