1. Welcome to Jeeps.net!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Jeep discussion topics
    • Communicate privately with other Jeep owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Grand Cherokee, 6 cyl, oil pump

Discussion in 'Cherokee' started by puppydrum, Feb 2, 2017.

  1. Feb 2, 2017 at 7:26 PM
    #1
    puppydrum

    puppydrum [OP] Member

    Joined:
    Feb 2, 2017
    Member:
    #908
    Messages:
    5
    Gender:
    Male
    The old oil pump kept oscillating between 40 psi and about 20 psi. Finally the other day my wife backed the car out of the garage and noticed that the gauge read 0. I replaced the oil pump and for the first 30 minutes or so the gauge stayed right on 50 psi. Then it began to oscillate between about 45 psi and 25 psi. I don't ever recall the gauge indicating these types of oscillations. Any thoughts?
     
  2. Feb 2, 2017 at 8:44 PM
    #2
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
    Oct 3, 2016
    Member:
    #317
    Messages:
    1,748
    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    It is normal for the oil pressure to fluctuate. The pump is driven off of the camshaft and therefore as rpms increase so should the oil pressure. At idle mine is very low, and when driving the pressure is higher especially when the engine is cold when the oil is thicker.
     
    chris4x4 likes this.
  3. Feb 4, 2017 at 5:26 AM
    #3
    puppydrum

    puppydrum [OP] Member

    Joined:
    Feb 2, 2017
    Member:
    #908
    Messages:
    5
    Gender:
    Male
    thanks for the information. just something I never noticed before.
     
To Top