Jump to content


Oil pressure gone up

  • Please log in to reply
3 replies to this topic

#1 monty

  • TR Register Members
  • 1,229 posts
  • Location:Gloucestershire
  • Cars Owned::1966 TR4A, 1963 TR4 & Audi TT @ present. In the past modified & tuned Mini, MG Midget, Mini 1275 GT, Cortina 1600E, Golf GTI X 2, MGB GT, Mini - Cooper, Porsche 911 X 3, Golf R32, MGC GT, Abarth Fiat 500 & various 4 X 4 work vehicles.

Posted 11 June 2018 - 06:38 PM

Hi All,
Just had an oil change (Millers 20/50 Classic) & the oil pressure appears to have risen by around 5psi throughout the range. Not a huge increase I agree but when cold the pressure is up to about 90psi until things warm up & it comes down to around 75 when it used to be 70 @ about 3000 rpm. After several miles the tick over pressure is around 20 to 25 when it used to be 15 to 20 (as I said overall a 5psi increase). Question is should I adjust or leave well alone? Just a little concerned to see it so high @ start & possibly pushing out more oil from the rear oil seal than before!
  • 0

#2 TR 2100

TR 2100
  • TR Register Members
  • 3,976 posts
  • Location:Overseas
  • Cars Owned::Currently 2x 1962 TR4s

Posted 11 June 2018 - 06:59 PM

I have much the same problem.  I choose to take it easy until

the oil gets a bit warm.  A bit frustrating, but I don't want to

mess about with the relief valve adjustment.



  • 0

#3 ChrisR-4A



  • TR Register Members
  • 862 posts
  • Location:Rochford Essex
  • Cars Owned::TR4A, Audi A3
    In the past, Alvis TD21, Jaguar MK2 3.4 Jaguar MK7 Turner 1200 Sports

Posted 11 June 2018 - 07:46 PM

The pressure you see on the gauge is that being fed to the main bearings, thicker oil cannot get through the bearings as quickly hence the pressure builds up, however the amount of oil exiting the bearings and generally sloshing around will be little different to what it was before and should not affect the rear oil seal. The quantity of oil exiting via the rear oil seal is usually determined by crankcase back pressure caused by piston blow by and poor crankcase ventilation, it is not affected by engine oil pressure.
  • 0

#4 Rem18

  • Registered User
  • 620 posts

Posted 12 June 2018 - 07:43 AM

Chris is right.

I wouldnt worry, I just changed back to Castrol classic on my 5 this time and saw the oil at like 90 when I started her. Took her out for a thrash (after she had warmed) beating some life out of the oil and now pressure is not so high anymore. hahahah

  • 0

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users