[TR] OIl pressure

[Tony Drews]

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 at 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