First off, 20 psi at 700 rpm idle is an acceptable oil pressure if it
jumps back up once the revs climb. Oddly behaving oil pressure can
be caused by a little piece of gunk caught in the pressure
bypass. That's the big screw with the locknut that protrudes from
the oil filter housing. Sounds like your piece of gunk got
dislodged, and the "problem" fixed itself.
- Tony Drews
At 11:09 AM 11/28/2008, DLylis@aol.com wrote:
>Well I hope I am not appearing to the list as the relative that just won't
>go home after Thanksgiving dinner, but I have another question.
>
>I left with a couple of friends this morning to go for a drive in our TRs.
>After about 20 -30 minutes we had to pull over (older crowd) and I noticed
>that my oil pressure dropped to 20 psi at 700 rpm idle. That
>seems odd as it
>is usually at 60 psi (newly rebuilt), but upon acceleration the
>needle jumped
>up into the normal zone of 70 - 80 psi at 2500 - 3000 rpm with no wavering;
>just steady as always. Throw in the clutch and back to idle and back to 20
>psi. That is a very wide swing.
>I left the group and went home to check this out. I opened the sending pipe
>at the bulkhead and put in an after market gauge and got the same result. I
>hooked up my electronic tach so I could get some readings for this post and
>at 600 -700/20 psi. 1000/45 psi. 2000 70 -80 psi. Hmmm. . . I
>shut off the
>car to scratch my head for a moment, and when I restarted it, 20 psi. I
>goosed the throttle and the needle jumped up as expected. Back to
>idle but this
>time 60 psi. I shut off the car, restarted, 60 psi at idle.
>Any ideas? There are no untoward noises and the car runs and idles very
>well.
>
>
>
>David Lylis
>69 TR6 CC26160L
>60 TR3A TS74461LO
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