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Sump Removal Amc V8

Discussion in 'Intermediate CJ-5/6/7/8' started by IrishCJ6, Oct 19, 2019.

  1. Oct 19, 2019
    IrishCJ6

    IrishCJ6 Member

    Wicklow Ireland
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    Guys my sump got a good smack the last trip out, I've tried to get the dent out with a slide hammer but I've noted the oil pressure is fluctuating and dropping at rpm but when left to idle it returns to normal. I think the pickup has been damaged or partially blocked from the dent?

    How hard is it to remove the sump with the engine in place, any tricks of the trade etc
     
  2. Oct 20, 2019
    sterlclan

    sterlclan Member Sponsor

    exploring the...
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    Pull one side motor mount and lift a little to clear the block sides of the mount.
     
  3. Oct 21, 2019
    zila

    zila I throw poop

    Rock Springs,...
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    I cut a corner off my passenger side motor mount to get mine off. Didn't take much.
     
  4. Nov 2, 2019
    IrishCJ6

    IrishCJ6 Member

    Wicklow Ireland
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    Guys, I've still got problems, below is the full story. What do you think

    Guys, I need some advice, a couple if weekends ago I was out wheeling and hit a tree stump which put a sizable dent in the oil pan. I drained the oil and using a slide hammer and a welded nut I tried to remove most of the dent. I then filled up with my normal 20w50 and some stop smoke additive (burns a little oil) and I noticed that the oil pressure would be normal at idle but when you accelerated the pressure would drop off and when the gas pedal was released the oil pressure returned to normal. My thought was the dent had damaged the intake or the dent maybe was still blocking the pickup. I thus removed the oil pan, and saw no damage to the intake pipe work and the strainer looked perfect. So I repaired the dent and reinstalled the oil pan. I've still got the same issue. Can anybody shed any light on a possible cause for this. Was thinking a oil filter issue or oil pressure release valve.

    Note my oil pressure would normally be:

    60 PSI cold
    40 PSI hot normal running rpm
    20 psi idle
     
  5. Nov 2, 2019
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor 2019 Sponsor

    cordele, Ga.
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    When the pan was bent it also bent the pickup screen part up slightly. At idle the pump is not sucking as much oil so pressure is low. When revving the pump is pulling much more oil which is lowering the oil in the pan and causing a oil starvation. (that is my theory and explanation)
     
  6. Nov 2, 2019
    IrishCJ6

    IrishCJ6 Member

    Wicklow Ireland
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    Possibly but I believe the gap between the strainer and pan is around 5/16 or so, that would mean less than a quart of oil in the pan which I struggle to comprehend. May latest thought is possibly a cracked intake pipe after the hit and maybe its allowing air to be drawn in? I'm really stumped on this
     
  7. Nov 2, 2019
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor 2019 Sponsor

    cordele, Ga.
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    Ok so if the screen sump head is submerged completely under oil at idle due low oil usage then oil in pan is reduced at revs and lowered below the top of sump screen head, that could leave the pickup pipe to screen head connection exposed to air. Crack at pipe to head connection.
     
  8. Nov 2, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    I don't recall the details of this engine... but damaged gasket at pickup tube to block sucking air at higher rpm?
     
  9. Nov 2, 2019
    IrishCJ6

    IrishCJ6 Member

    Wicklow Ireland
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    I dont believe there is any gaskets on the intake, it's one piece and screws directly into the block
     
  10. Nov 2, 2019
    IrishCJ6

    IrishCJ6 Member

    Wicklow Ireland
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    Possibly but the strainer is say 5/8 or so thick. That would say less than 2 quarts in the pan at throttle, I still cant believe that there would be so little in the pan. I do feel it's likely to be air but I don't want to pull the oil pan again if it was something totally non related (ie oil pressure relief or faulty oil filter) that has just happened at the same time as this, unlikely but I'm really not wanting to drop the pan again
     
  11. Nov 2, 2019
    Buildflycrash

    Buildflycrash Member Sponsor

    Gulf Breeze FL...
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    I’ve gone to this thread 2x hoping to see video of you ripping a TREE STUMP from the ground with your v8 Jeep.
     
  12. Nov 2, 2019
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor 2019 Sponsor

    cordele, Ga.
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    I hear you not wanting to drop the pan. Sometimes 2 unrelated things at the same time makes troubleshooting very difficult. Good luck.
     
  13. Nov 2, 2019
    Oldriginal86

    Oldriginal86 Member

    Pasadena, Md.
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    I know you don’t want to hear it, but at this time it looks like dropping the pan is the only option. This will tell the tale and eliminate all the what if’s.
     
  14. Nov 2, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    Then maybe a crack at the threads?
     
  15. Nov 2, 2019
    nickmil

    nickmil In mothballs. Sponsor

    Happy Valley, OR
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    Cracks in the oil pickup.
     
  16. Nov 3, 2019
    IrishCJ6

    IrishCJ6 Member

    Wicklow Ireland
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    Thanks guys, looks like no choice but to drop the pan again. Any tips for removing the pickup and strainer pipe and resetting it to the correct orientation and height afterwards? I've also heard that the pump might be sucking the pan upwards to the strainer and that there should be a button or dimple at the base of the strainer to prevent this, has anyone seen this before as there was nothing on the base of my strainer and the new one listed from Rockauto doesn't show anything either? Suggestion is something between 5/16 and 3/8 of a spacer
     
  17. Nov 3, 2019
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor 2019 Sponsor

    cordele, Ga.
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    Research shows a spacer is needed between the pan and the bottom of the pickup screen if a stand-off is not provided with new pickup. Some guys have tack-weld a nut on pickup.
     
  18. Nov 3, 2019
    sterlclan

    sterlclan Member Sponsor

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    i tacked a nut to the edge of the pickup to prevent this. i would guess the pickup or the screen is cracked or some way leaking. i have a buddy that had one crack on his chevelle same symptoms as you his dropped enough to flicker the oil light under a load.the tube was cracked right at the pump.
     
    Walt Couch likes this.
  19. Nov 3, 2019
    IrishCJ6

    IrishCJ6 Member

    Wicklow Ireland
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    Went back to the garage this morning to experiment whether additional oil would make a difference (ie if it got above the crack point) however, when I went to start it this morning there was absolutely no oil pressure on initial start up, I shut it down and proceeded to drop the coil and crank over to get oil pressure, I did get normal oil pressure after cranking and then reconnected the coil and started it up. The interesting thing was the additional oil actually made the oil pressure worse?

    Why would the engine have no oil pressure after sitting overnight (had normal oil pressure yesterday)

    Why would adding additional oil make the oil pressure drop?

    I feel there is something else at play here?
     
  20. Nov 3, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    Oil frothing in the sump, when the oil is whipped by the crankshaft.
     

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