SPONSORED LINKS

1977 MGB Oil Pressure

Tiny
CANTJO
  • MEMBER
  • 1977 MG MGB
  • 4 CYL
  • 2WD
  • MANUAL
  • 55,348 MILES
My 77B has high oil pressure. High being about 60psi at 1000rpm and 85 to 90psi at 3000rpm. I have checked the screen in the sump an it was fine. I replaced the relief valve and spring. I tried an engine flush. The thing that really bothers me is when I take the oil filler cap off I do not get any blow by or see any oil flowing. The older cars that I have owned when you take off the oil filler cap oil will blow out it. I have started and ran it several times for 10 to 20 minutes and it has not blown up yet. Does anyone have any suggestions?
SPONSORED LINKS
Tuesday, June 2nd, 2009 AT 4:25 PM

5 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
According to the boys that built car
idle pressure 10-25 psi
Running 50-80 psi Did you replace relief valve spring? Was free length 3 in? Normal opening of relief is 70psi.
Have you checked with mechanical gague. Lucas the Prince of Darkness can't be relied on.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
-1
Wednesday, June 3rd, 2009 AT 3:01 PM
Tiny
CANTJO
  • MEMBER
  • 3 POSTS
Yes I replaced the spring and valve that I purchased from MOSS. I also checked with a mechanical unit also and no difference.
Was this
answer
helpful?
Yes
No
Wednesday, June 3rd, 2009 AT 3:45 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
If no rocker arm clatter I go with it was engine recently rebuilt. You have solid lifters and oil comes up into rocker shaft not alot of flying oil. What viscosity oil and filter needs relief spring.
Was this
answer
helpful?
Yes
No
Wednesday, June 3rd, 2009 AT 4:13 PM
Tiny
CANTJO
  • MEMBER
  • 3 POSTS
No it has not been rebuilt. The odometer only shows 55149 and I'm guessing that's correct. I have 20w50 in it and a Purlator L14670. It does have a little lifter noise until the oil warms a little but then it is quiet.
Was this
answer
helpful?
Yes
No
Wednesday, June 3rd, 2009 AT 9:14 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Pull the rocker cover and remove rocker assembly. Clean it out slug can build up inside. And give it a valve adjustment. Couldn't hurt
Also recomend a Robert Bentley service manual pretty sure MOSS has
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, June 4th, 2009 AT 1:43 PM

Please login or register to post a reply.

Related Oil High Pressure Content

Oil Pressure High
GUIDE
Oil Pressure High
High engine oil pressure can cause severe engine damage such as oil pump drive and oil filter failure. Once these conditions occur the engine will rapidly start to wear and...

Sponsored links