The Mobil One should not limit the oil pressure unless it is a low viscosity
such a 0W-20, if you are running a 5 or 10W-30 I would look elsewhere for
the problem. If your readings are accurate I would suspect the oil pump. The
pump has a pressure relief valve, basically a spring loaded blow off valve,
that will limit the oil pressure and worn pump gears or housing will prevent
the pump from producing it's intended output. If the spring has brokenthe
relief valve will open before it is intended to and keep the pressure low.
My car has a Melling high volume pump that will put out about 65 psi
pressure hot or cold. I had this same pump in my engine before I rebuilt it,
and even with a worn engine the oil pressure was 65 psi above about 1500
rpm. I have to suspect the oil pump in your engine has seen better days.
Happy Motoring!
Doug Leithauser
Got Jesus?...Don't leave Earth without Him!
> Date: Sun, 14 Aug 2005 15:48:24 CDT
> From: "Randal J. Zimmermann" <zimme008@umn.edu>
> Subject: Oil Pressure
>
> I'm trying to get my Tiger on the road before summer's end after a
> lengthly
> restoration. I recently started the rebuilt 260 and while it ran somewhat
> well, I didn't want to keep it running because I was only getting about 15
> lbs pressure to show on the oil gauge.
>
> I've checked the gauge lines to be sure the connections are tight and I've
> inspected the engine for possible oil leaks but all seem to be tight.
> I've
> checked and rechecked to be sure the distributor cam is engaged with the
> oil pump and all seems to be as it should. I expect that if the oil pump
> wasn't working I wouldn't see any pressure at all. I've put in Mobil One
> but I doubt that would effect the pressure.
>
> Any suggestions as to other sources of the problem? Am I being too
> paranoid? Thanks.
>
> Randy Z.
> St. Paul, MN
>
> ------------------------------
>
> Date: Sun, 14 Aug 2005 20:17:39 -0300
> From: Dave Munroe <dave@munroe.ca>
> Subject: RE: Oil Pressure
>
> Oops! Sorry, I didn't edit my last reply:
> Here it is again.
>
> Hi Randy;
>
> I'm interested in the answers you get as my oil pressure doesn't seem to
> be up to reasonable pressure after my rebuild either, but its not as bad
> as yours. I get about 50 psi on start-up, and then when the motor gets
> up to operating pressure it drops to about 35 psi at cruising (3500 rpm)
> speed. I'm using 10W30 GTX.
>
> Dave
> 289 Bored and stroked to 331 cu.in.
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