>
> <<<<Driving around town on the back roads, the pressure stays around 25 to
> 35. It seems that if I take it out on the highway, I lose a lot more
> oil.>>>>>
I wrote to the group awhile back stating that what seemed like overnight my
oil pressure was lower than it used to be. I normally start the cold engine
(early '74 MGB) with about 75lbs. max pressure. After about a minute it
kicks down to about 60lbs. As the engine is warmed completely (mostly
steady freeway driving) the pressure levels out to around 55lbs.; 50lbs. at
the very lowest (usually in 90-100 degree F heat). Well, last month I
noticed that when the engine was fully warmed and driven about 10 minutes
on the freeway, the pressure was dropping to about 45lbs.
I serviced the B last month. I replaced the oil and put on a new Unipart
spin-on filter and hand tightened it as usual. Well, my pressure is back up
to where it always has been. The culprit was a Fram oil filter which was
obviously not working properly. (I had changed the oil only after I noticed
the drop in pressure, but this didn't change a thing). So, upon changing
the oil again and installing a 'real' filter, I've got the oil pressure
back up.
Try this on your MGA and see if it helps any. Also, replace your oil
pressure relief valve with a new one and see if this doesn't help your
pressure problems as well.
Good luck,
Craig Wiper
craigw@sonic.net
http://www.sonic.net/~craigw
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