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Help diagnosing noise

Discussion in 'Early CJ5 and CJ6 Tech' started by aekdbbop, Nov 8, 2015.

  1. Nov 8, 2015
    aekdbbop

    aekdbbop Member

    TN
    Joined:
    Jul 31, 2014
    Messages:
    403
    The jeep- frankenjeep barn find with f134 t90/d18.

    The noise-
    -it's coming from around the engine.
    -only when accelerating
    -only when in gear
    -sounds like a chattering or rattle that is directly in time with the rpms of the engine

    I know the throw out bearing (and whole clutch I guess) needs replacing... I'm guessing this is related.

    Any ideas?
     
    aekdbbop, Nov 8, 2015
    #1
  2. Nov 8, 2015
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,381
    Most of that description rules out throwout bearing in particular. Does the engine run good? Good oil pressure? Something sound loose?
     
    Glenn, Nov 8, 2015
    #2
  3. Nov 8, 2015
    PeteL

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

    Hills of NH
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    Aug 3, 2003
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    Bad engine mount, and/or exhaust hitting something?
     
    PeteL, Nov 8, 2015
    #3
  4. Nov 8, 2015
    aekdbbop

    aekdbbop Member

    TN
    Joined:
    Jul 31, 2014
    Messages:
    403
    Engine runs good, good pressure..

    I know a mount needs replacing.. Didn't think of that..

    Would that be a difference if it was our was not in gear?
     
    aekdbbop, Nov 8, 2015
    #4
  5. Nov 11, 2015
    Splinter

    Splinter New Member

    Joined:
    Nov 10, 2015
    Messages:
    3
    When in gear is it at all rpm ranges? Have you checked the bellhousing bolts? Maybe something loose there causing clutch chatter? No load on the flywheel in neutral but chatters under load?
    Just throwing out a couple of ideas.

    Edit) Did it start as a squeak? U-joints?
     
    Last edited: Nov 11, 2015
    Splinter, Nov 11, 2015
    #5
  6. Nov 11, 2015
    scoutpilot

    scoutpilot Member

    Asheboro, NC
    Joined:
    Jun 7, 2014
    Messages:
    431
    Bad clutch, bad motor mount. Little to no torque on drivetrain while idling. Torque on drivetrain under load. Yeah, something might rattle.
     
    scoutpilot, Nov 11, 2015
    #6
  7. Nov 13, 2015
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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    Jan 11, 2015
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    1,301
    maybe intermediate shaft and needles in d18 if the jeep is moving with this noise. just a thought
     
    3b a runnin, Nov 13, 2015
    #7
  8. Nov 15, 2015
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
    Joined:
    Nov 27, 2006
    Messages:
    2,793
    Kinda a ringing noise? could be the fan blades ticking agains the shroud. Or something the fan belt is rubbing against.
     
    1960willyscj5, Nov 15, 2015
    #8
  9. Nov 15, 2015
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
    Joined:
    Nov 27, 2006
    Messages:
    2,793
    After re-reading the first post, I would say replacing the motormounts is a must. Your motor is shifting under load and allowing the fan to contact the shroud or some other close part.
     
    1960willyscj5, Nov 15, 2015
    #9
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