At 11:58 PM 01/08/99 EDT, you wrote:
>
>Well, the new TR had to let me know that it was alive and British. Perhaps
>someone will recognize these symptoms:
>
>Upon starting, oil pressure is about 70-80 lbs.
>
>Running about 15-20 mins drops to about 50.
>
>Running another 10 mins or more drops to 20!
>
>All figures are at about 3000 rpm. At idle, pressure is avg of 20-40 when
>warm. Temp usually maxes at about 1/2.
>
>Driving conditions: warm LA weather (about 85 deg).
Well...
My TR6 has been doing a similar thing. It seems to me that the problem is
related to engine/oil temperature. As the oil warms up, it thins out (And
of course, flows better!)
You could check the amount of wear in the upper rocker area. That area is
notorious for wearing out (And flowing more oil than it should).
When I added an external oil feed to the upper rocker shaft, my oil
pressure actually went DOWN, as so much oil was flowing into the upper
rocker area.
Probabaly your problem is a combination of a tired oil pump, and worn rockers.
A thicker oil may help a bit, but then, that's me being really optimistic!
Regards,
Frank de Kat
fdekat@sentex.net
Dundas, Ontario, Canada
http://www.sentex.net/~fdekat
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