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

Oil Pump Woes

Discussion in 'Early CJ5 and CJ6 Tech' started by Howard Eisenhauer, May 21, 2013.

Page 1 of 2
  1. May 21, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    I'm pulling my hair out here folks- I can't get the *&%!* oil pump to pump while cranking the engine over with the starter. I've tried priming by shooting pressurized oil into the sender port, I've dropped the pan & timing cover to make sure it's not coming out somewheres it's not supposed to (don't ask what the garage floor looks like right now- or my face), checked the bearing clearances- 1 1/2 -2 thou, I tried another known good pump and nothing is making sense to me. I wouldn't expect it to build up any vast amount of pressure but I'd at least expect it to come dribbling out the sender hole.

    Anyone got any ideas?

    H.
     
    Howard Eisenhauer, May 21, 2013
    #1
  2. May 21, 2013
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
    Messages:
    1,035
    Did you stuff it with vaseline?
     
    AKCJ, May 21, 2013
    #2
  3. May 21, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    No, it did have oil in them though, plus the priming was done after they were mounted.. I did bench test them too, they're both fairly tight so they should suck the oil up from the pickup.

    H.
     
    Howard Eisenhauer, May 21, 2013
    #3
  4. May 21, 2013
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,524
    Leak in the pick-up system somewhere, gasket, flange ??????
     
    jpflat2a, May 21, 2013
    #4
  5. May 21, 2013
    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:
    9,827
    Distributor shaft gear installed correctly, tight/pinned? Distributor seated?

    Is the drive gear stripped? Cam turning?
     
    Last edited: May 21, 2013
    PeteL, May 21, 2013
    #5
  6. May 21, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    Pickup is tight. Pump is tight to the block.

    F4, the pump drives the distributor. Everything is turning.
     
    Howard Eisenhauer, May 21, 2013
    #6
  7. May 21, 2013
    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:
    9,827
    "F4, the pump drives the distributor."

    Right. I used to know that...

    I'd try the vaseline.
     
    PeteL, May 21, 2013
    #7
  8. May 21, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    There s a joke in there somewhere, I'm sure Don will be along with it any moment... :rofl:
     
    Howard Eisenhauer, May 21, 2013
    #8
  9. May 21, 2013
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,524
    Would the engine being turned by the starter only be enough speed to do what you want it to do?
    What's the engine turn over speed by the starter, 300 rpm....maybe?
    Does an electric drill turning the oil pump give you the result you're looking for?
    From my F4 days, seems the drill really bogged down when the pump primed and started pumping.
     
    jpflat2a, May 21, 2013
    #9
  10. May 21, 2013
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
    Joined:
    Mar 29, 2007
    Messages:
    5,923
    jp if you tried that, you would be turning the engine. Howard do you suppose there might be a problem with the relief valve.
     
    Walt Couch, May 21, 2013
    #10
  11. May 21, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    Hadn't thought of that- I'll look into it although the loaner pump I had didn't seem to work either. I think I'll also slap a vacume on the block feed port to see if I can at least pull oil up from the pickup.
     
    Last edited: May 21, 2013
    Howard Eisenhauer, May 21, 2013
    #11
  12. May 21, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    No wheres near 300, maybe 120-180. Still I'd at least expect it to pump something into the main gallery & out the sender hole.

    H.
     
    Howard Eisenhauer, May 21, 2013
    #12
  13. May 21, 2013
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,378
    Did you soak the pump in oil?
     
    Glenn, May 21, 2013
    #13
  14. May 21, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    Filled it up yes, although a lot dribbled out when I installed it.
     
    Howard Eisenhauer, May 21, 2013
    #14
  15. May 21, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    I'd pack it with Vaseline. It won't run out (unless very hot ambient temp) a d creates a very good suction. If there is any air in the pump I've seen where it won't create enough of a vacuum to pull oil up through the pickup. Gravity can be hard to overcome with a fluid. I had a similar issue with a Buick engine a d an AMC. Vaseline fixed the problem. I would definitely follow the other suggestions to make sure you have a good seal at the pickup and at the pump to insure you are not sucking air.


    Sent from my iPhone
     
    nickmil, May 21, 2013
    #15
  16. May 22, 2013
    Stout

    Stout Member

    Quakertown, PA
    Joined:
    Nov 1, 2010
    Messages:
    958
    I just installed an NOS pump on my F head. I dipped it in oil, installed it, and cranked the engine over. It only cranked about maybe 20 times before oil began dribbling out of the sender hole. I did leave the spark plugs out so it would crank faster without compression.
     
    Stout, May 22, 2013
    #16
  17. May 22, 2013
    WorkInProgress

    WorkInProgress Member

    Kennewick, Wa
    Joined:
    Jul 15, 2012
    Messages:
    967
    Just throwing this out there since Im not sure, but would a bad gasket that seals the floating oil pickup to the block allow air in and not allow suction? My owners manual says having that gasket go out would severely affect oil pressure. And that gasket is cheap assurance since your supposed to clean the floating pickup yearly anyways (According to my Owners Manual) which would probably be too frequent on modern roads unless your offroad a lot.
     
    WorkInProgress, May 22, 2013
    #17
  18. May 22, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,124
    I checked the pickup tube, it's tightly bolted to the block, two machined surfaces. Even if i did forget the gasket i can't see it sucking so much air it wouldn't pick up the oil.

    H.
     
    Howard Eisenhauer, May 22, 2013
    #18
  19. May 22, 2013
    Stout

    Stout Member

    Quakertown, PA
    Joined:
    Nov 1, 2010
    Messages:
    958
    If you have an oil pressure gauge you could try starting the engine and then shut it down immediately if the pressure doesn't start to build. It's risky but if you have a reliable gauge, it can be done safely.
     
    Stout, May 22, 2013
    #19
  20. May 23, 2013
    jglad

    jglad Village Idiot

    Glenville, WV
    Joined:
    Oct 5, 2008
    Messages:
    123
    I had the same problem once and it turned out the pickup tube was clogged.
     
    jglad, May 23, 2013
    #20
Page 1 of 2
New Posts