1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Amc 360 Loses Oil Pressure

Discussion in 'Intermediate CJ-5/6/7/8' started by jackdog, May 16, 2024.

  1. May 16, 2024
    jackdog

    jackdog Member

    Finger Lakes NY
    Joined:
    Jul 16, 2013
    Messages:
    529
    Been working on a 1980 something CJ7 that has a AMC 360 installed. After setting for a long time it will not build oil pressure. I have to pack the pump with Vaseline, pull the distributor and use a drill to spin the pump to prime it. Works fine until an extended period of not running. Any ideas?
     
    Ol Fogie likes this.
  2. May 16, 2024
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,535
    And the oil pump gears/housing appear okay ?
     
    jackdog likes this.
  3. May 16, 2024
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    9,953
    Is there a non-return check valve which is leaking down?
     
    jackdog likes this.
  4. May 16, 2024
    jackdog

    jackdog Member

    Finger Lakes NY
    Joined:
    Jul 16, 2013
    Messages:
    529
    New gears, housing looks ok.
     
  5. May 16, 2024
    jackdog

    jackdog Member

    Finger Lakes NY
    Joined:
    Jul 16, 2013
    Messages:
    529
    I was told by the owner he had a oil pump kit put in it, new gears, spring and check valve. Last time I had it in the garage I had the pump apart and the gears and housing looked good but I didn't check the spring and valve. Probably should have. I seem to remember there was two types of housings on the 304?
     
  6. May 16, 2024
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    1,255
    I would check the anti drainback valve as well as the bypass valve. I've seen the bypass valve stick in the bore. While this usually still allows the pump to pick up pressure, it can be low to non existent at idle.
     
    jackdog likes this.
  7. May 16, 2024
    Daryl

    Daryl Sponsor

    Bonney Lake, WA
    Joined:
    May 25, 2006
    Messages:
    2,891
    Not every oil filter works on an AMC motor. Try another brand or one that specifically states to be anti drainback.
     
    Joe Dokes, jackdog and Ol Fogie like this.
  8. May 16, 2024
    Keys5a

    Keys5a Sponsor

    Florida Keys
    Joined:
    Jan 23, 2014
    Messages:
    4,247
    X2. The incorrect filter can allow gravity to drain the pump and pickup.
    -Donny
     
  9. May 17, 2024
    Ol Fogie

    Ol Fogie 74 cj5 304, 1943 mb

    Southern...
    Joined:
    Nov 24, 2019
    Messages:
    1,872
    Could someone supply the brand and number that has this anti drain back valve filter for the 304.
     
    jackdog likes this.
  10. May 17, 2024
    45es

    45es Active Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Naches, WA
    Joined:
    Mar 31, 2007
    Messages:
    1,120
    WIX 51258, FRAM PH25, BOSCH 3423, FRAM HP5
     
    dsrt4, Daryl, jackdog and 1 other person like this.
  11. May 19, 2024
    dsrt4

    dsrt4 Member

    Joined:
    Oct 30, 2009
    Messages:
    583
    Yep. Grab the wix. 51258
     
    Ol Fogie and jackdog like this.
New Posts