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Diesel like clatter in a V-6

Discussion in 'Early CJ5 and CJ6 Tech' started by wrenchbender1, Jun 25, 2007.

  1. Jun 25, 2007
    wrenchbender1

    wrenchbender1 New Member

    Joined:
    Apr 23, 2007
    Messages:
    20
    Hi all. My motor had a clatter that has me stumped. It seems to be coming from the front of the motor. At first I thought that it was excessive vertical play in the distributor shaft so I installed another washer in between the distributor gear and the housing. This had no effect so I pulled off the valve covers thinking that maybe one of the rocker arms had worn out. No luck. I have a video of the engine running at the link below. Have any thoughts?

    http://s53.photobucket.com/albums/g48/wrenchbender1/Jeep/?action=view&current=DSCF0002.flv
     
  2. Jun 25, 2007
    Posimoto

    Posimoto Hopeless JEEP Addict

    Minden, Nevada
    Joined:
    Aug 7, 2003
    Messages:
    4,487
    Check the bolt that holds the engine damper on the end of the crank. Or a really bad timing chain?
     
  3. Jun 25, 2007
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
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    10,704
    I'm gonna guess the timing chain is slapping the cover.
     
  4. Jun 25, 2007
    lamar

    lamar Member

    greenville sc
    Joined:
    Jan 25, 2004
    Messages:
    327
    mine makes the same noise till it warms up real good say after 30 min. of driving.
     
  5. Jun 25, 2007
    wrenchbender1

    wrenchbender1 New Member

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    Apr 23, 2007
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    I was thinking timing chain too. But the jeep supposedly only has 34000 miles on it. The compression test I did after buying it would seem to back this up (All cylinders in the 160's).
     
  6. Jun 25, 2007
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
    Joined:
    Jul 30, 2003
    Messages:
    8,169
    the rubber tensioners the chain rides on could be worn down to metal
     
  7. Jun 25, 2007
    lamar

    lamar Member

    greenville sc
    Joined:
    Jan 25, 2004
    Messages:
    327
    by the way my noise goes away it gets to around 1000 to 1300 rpms.
     
  8. Jun 26, 2007
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
    Messages:
    1,026
    If the timing is wayyyyy off it can make it sound like a bucket of bolts. Check it with your timing light.

    Timing chain - just check it out. You can take the distributer cap off then rotate the motor by hand (crank pulley nut) to see the relationship. I've heard you can feel the chain through the hole if you take off the fuel pump.
     
  9. Jun 26, 2007
    wrenchbender1

    wrenchbender1 New Member

    Joined:
    Apr 23, 2007
    Messages:
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    Timings fine. I set it and the dwell when I put the distributor back in. I'll have to check the chain.
     
  10. Jun 26, 2007
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
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    6,722
    Last time I had a "diesel" engine noise it turned out to be a rod bearing :(.

    The good news was I put 30-40 K on the engine before it died for other reasons.

    H.
     
  11. Jun 26, 2007
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
    Joined:
    May 18, 2006
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    2,622
    Had this problem with mine and it turned out to be the advance weights in the distributor. The bushings were worn so oblong that the weights were able to fly up at the ends and contact the inside of the cap. Metal weight on plastic cap made diesel chatter. Would go away with a little RPM. I had to actually pull the weights out before I found the problem.
     
  12. Jun 26, 2007
    wrenchbender1

    wrenchbender1 New Member

    Joined:
    Apr 23, 2007
    Messages:
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    Hmmm. I'll have to try that. The weights on mine do have a bit of slop to them.
     

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