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88 Cherokee Piston Slap? Nope, Cracked Flexplate

Discussion in 'Quitters' Club' started by Focker, May 30, 2017.

  1. May 31, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

    Tri-Cities WA
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    Great feedback guys, but it's not as simple as the AC bearing. :(

    I removed the pan and found this. Some type of gear pieces? The seller put a new distributor in...Maybe the old one broke off?
    [​IMG]

    I pulled off the belt, spun everything and it all sounded good. I put a wrench to the crank pulley, turned a few times and felt up in every cavity...Nothing obvious. I started the engine for about 3 seconds and the knock/clank/slap is still there.

    There's this...
     
  2. May 31, 2017
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Was the AC on when you took the video?

    Ignore this question.
     
  3. May 31, 2017
    termin8ed

    termin8ed I didn't do it Staff Member Sponsor

    Mason, MI
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    Id still pull the serpt belt and see if its still there if you havent allready
     
    ITLKSEZ likes this.
  4. May 31, 2017
    termin8ed

    termin8ed I didn't do it Staff Member Sponsor

    Mason, MI
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    From that 2nd video, does it click when you are moving the journal front to back (sideways) or up and down?
     
  5. May 31, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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    I took the belt off immediately after 47v6 posted about the AC.
    Just front to back (sideways).
     
  6. May 31, 2017
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
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    The amount of fore-aft thrust slop is pretty high? Are there thrust control main bearings on that crank? Is this an automatic?
     
  7. May 31, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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    I don't know?
    Yes.
     
  8. May 31, 2017
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
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    Damn, thought this would be simple. Drive it till it explodes. put a new junk engine in, repeat.
     
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  9. May 31, 2017
    termin8ed

    termin8ed I didn't do it Staff Member Sponsor

    Mason, MI
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    There are thrust bearings if i remember right, but dont think the side to side play would cause that much noise
     
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  10. May 31, 2017
    termin8ed

    termin8ed I didn't do it Staff Member Sponsor

    Mason, MI
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    Cracked flexplate will make that kind of rattle too. Can you tell if its comimg from top/bottom, front/back?
     
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  11. May 31, 2017
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    I've seen a torque converter break loose internally and make an intermittent racket. Still worked, but was noisy.

    Loose flex plate bolts will do it too.

    I'm really curious which direction it's coming from.
     
    Focker likes this.
  12. May 31, 2017
    tarry99

    tarry99 Member Sponsor

    Northern California
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    Belt..........try spraying some non-slip on it.............or smog pump if it has one.......
     
  13. Jun 1, 2017
    termin8ed

    termin8ed I didn't do it Staff Member Sponsor

    Mason, MI
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    Can you see the drive gear for the distributor? I would think with that much noise if that was it you would be having problems skipping teeth, jumping timing, not running...
    But worth a look i guess
     
  14. Jun 1, 2017
    73 cj5

    73 cj5 Not ready for the junkyard yet Sponsor

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    Wrist pin?
     
  15. Jun 1, 2017
    montanacj

    montanacj Sponsor Sponsor

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    Wow psyched for your purchase of the Fock Crawler, interested to see where this goes.
     
  16. Jun 1, 2017
    tarry99

    tarry99 Member Sponsor

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    Have you tried holding your hand on any part of that motor , valve cover , Ac , smog pump or block while running , when it makes that clicking sound.........just to see if you can feel it at the same time you hear it?
    A mechanics stethoscope or even a long handled screw driver with your ear planted at the handle end may help detect a metallic hitting issue.............

    From the looks of that broken distributor gear it begs the question what caused that failure? and what other collateral damage ensued .........not sure how or where that gear engages on the motor........but if it's on the camshaft you may be missing a tooth or portion or if that survived then perhaps the timing gears or if it's belt driven up front that may also have some skipping issues.........although at Idle it seems to run OK.
     
  17. Jun 1, 2017
    termin8ed

    termin8ed I didn't do it Staff Member Sponsor

    Mason, MI
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    Click.
    Save.
    :D
     
  18. Jun 1, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

    Tri-Cities WA
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    I agree...It's too inconsistent.
    I can't tell.
    Yes...It looks good.
    Maybe?
    I was under it and the oil pan resonated so much that I was unable to locate.
     
  19. Jun 1, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member Sponsor 2019 Sponsor

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    Just noticed this. o_O

    Timing chain.
     
  20. Jun 1, 2017
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
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    thats your timing chain? Well, fix it!
     

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