Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

really high oil pressure, need help

Discussion in 'The Garage' started by milspecjimmy, Feb 23, 2003.

  1. milspecjimmy

    milspecjimmy 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    901
    Likes Received:
    0
    Location:
    raymond, maine
    i just put a salvage yard motor from a 1987 G20 van in my jimmy. it at some point had been rebuilt. it is completely installed, and runs very well. the only problem is that the oil pressure gauge(factory) shows 60 lbs of oil pressure at idle, and goes off the scale when you rev it at all. I figured that since the motor had sat around the salvage yard for a while it may have had a stuck pressure relief valve in the oil pump, so i bought a new melling pump and installed it today. No change in pressure readings. could it be the gauge? i used the sending unit from the motor that was originaly in the jimmy. HELP
     
  2. Z3PR

    Z3PR Banned

    Joined:
    Mar 30, 2002
    Posts:
    19,217
    Likes Received:
    0
    Location:
    Everywhere
    Try a machanical gauge. I really never trusted the electrical gauges. You may wanta flush the oiling system.
     
  3. milspecjimmy

    milspecjimmy 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    901
    Likes Received:
    0
    Location:
    raymond, maine
    i did flush the oil system. i put 3 cups of keroseen in the oil, and ran it for 15~20 min at idle, and noticed no change in the pressure. then i changed teh pump and oil/oil filter
     
  4. TX Mudder

    TX Mudder 1/2 ton status

    Joined:
    Jul 10, 2000
    Posts:
    2,514
    Likes Received:
    0
    Location:
    Houston
    Sounds like a restriction somewhere...not good.
    I'm not sure what to do about it though.
    Did you pull any main or rod bearing caps to check for wear?
    -- Mike
     
  5. TX Mudder

    TX Mudder 1/2 ton status

    Joined:
    Jul 10, 2000
    Posts:
    2,514
    Likes Received:
    0
    Location:
    Houston
    Sounds like a restriction somewhere...not good.
    I'm not sure what to do about it though.
    Did you pull any main or rod bearing caps to check for wear?
    -- Mike
     
  6. milspecjimmy

    milspecjimmy 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    901
    Likes Received:
    0
    Location:
    raymond, maine
    the sick thing is that i just sold my mechanical gauge to REDFROG /forums/images/graemlins/rolleyes.gif
     
  7. TX Mudder

    TX Mudder 1/2 ton status

    Joined:
    Jul 10, 2000
    Posts:
    2,514
    Likes Received:
    0
    Location:
    Houston
    I'm pretty sure I have an extra stock mechanical oil pressure gauge in my garage.
    You have to buy the universal mech gauge hose kit at Autozone or whatever you have around you to connect it since I don't have a spare hard line (plus how would one ship that sort of thing?)
    -- Mike
     
  8. wayne

    wayne 3/4 ton status

    Joined:
    Feb 1, 2001
    Posts:
    6,178
    Likes Received:
    0
    Location:
    Carlisle, Pa
    Did your origional Jimmy engine have an oil cooler and now you don't? I had the exact same problem on my engine after just removing the factory oil cooler. I had 45 pounds at idle and pegged the guage when I hit the gas. Drove it like that with no problems untill I parked it a couple months later.
     
  9. Stickseler

    Stickseler 3/4 ton status

    Joined:
    Mar 23, 2001
    Posts:
    6,503
    Likes Received:
    0
    Location:
    Northern Virginia
    Mine has stayed peged while I drive since I got the new motor, It Idles at 30. Not that that helps you any /forums/images/graemlins/confused.gif
     
  10. milspecjimmy

    milspecjimmy 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    901
    Likes Received:
    0
    Location:
    raymond, maine
    i am thinking the oil pressure switch, or the gauge is screwed up. i am going to put a hand held gauge on it monday and see what is says.
     

Share This Page