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Thread: ZF thumps

  1. 21st November 2007, 08:17 PM #1
    Charlie Guest

    ZF thumps

    The auto in my 300Tdi makes a slight 'thump' at about 42kph, very unlike the normal gear change. Happens hot, cold, up hill, down hill, hard acceleration, gentle acceleration, but not when the selector is in 3rd. Moving the lever from 3rd to 4th at speeds above 45kph results in an occasional thump. All other gear changes are fine. Oil is clear and smells sweet.

    Any suggestions what might be causing the thump?
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  2. 21st November 2007, 09:38 PM #2
    PhilipA
    PhilipA is offline Swaggie Subscriber
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    Torque converter lock up?
    Its at 85Kmh in a V8 , but I do not know about a 300Tdi.
    But its really the only thing that fits the bill.
    Regards Philip A
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  3. 21st November 2007, 09:39 PM #3
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    Vern
    Vern is offline OldBushie
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    Similar in a 300tdi, around 80-85k. No idea
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  4. 22nd November 2007, 08:43 AM #4
    Charlie Guest
    It feels a bit like torque converter lock up, but that still happens correctly at a bit under 80kph. More accelerator after the thump results in increased engine revs without much speed increase, typical of the torque converter not being locked.

    Its got me!
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  5. 22nd November 2007, 09:17 PM #5
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    sclarke
    sclarke is offline TopicToaster
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    Ahhhhhhhhhhhh
    The old Dreaded Thump in the Auto Trick....




















    Dunno... cant help you.... just trying to get my post count up... lol
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