‘Clunk’ sound when taking up drive

Discussion in 'Mech Tech' started by Zoedanbus, Oct 14, 2019.

  1. Hi there, had this for quite a few years and thought I’d see if anyone had any thoughts.

    When I take up drive and release the clutch we get a ‘clunk’ sound. This only seems to happen when changing from reverse to first gear (and vice-versa) and then starting to drive as the clutch is released.

    Hope that makes sense. It’s a single ‘clunk’ sound each time. Clutch or release bearing? Or something more sinister in the gear box?

    It’s a clean single sound that’s is metallic in nature.

    Cheers again
  2. How quick do you release your pedal when in 1st ? if the pedal is not adjusted correctly could well be the problem .
  3. Sounds like worn mountings somewhere.
    Put it in gear and try rocking it to see where the noise is coming from.
    Zoedanbus and Mark Darby like this.
  4. Ah, careful release like during normal driving and when setting off. Nothing aggressive.

    Ah, the mounts is a good point, it does have that heavy sound like a large bit of metal hitting something. Will check these out too. Great! Thank you.
  5. Might it be the slack getting taken up in the Ring and Pinion, or the Diff? Tho' the mount is most plausible.
    Zoedanbus likes this.
  6. Check your CV Joints and your wheel bolts
    paul2590, nicktuft, Zoedanbus and 2 others like this.
  7. ^this
  8. Don't CV joints tend to click, make a higher pitched sound? Not saying it isn't the CV, just wondering.
  9. Yeah I think they’re solid, but will check on all this when I have a moment. Thanks all!
  10. It is quite a deep clunk
  11. Could be slack in the gearbox, check everything else first, of course. But if the output part of box is a bit worn, you might find the slack needs to be taken up when changing direction.
    Last edited: Oct 16, 2019
    Zoedanbus likes this.
  12. Worth also checking the mounts especially the rubber block under the pickle fork at the front of the gearbox
    nicktuft and Zoedanbus like this.
  13. Sorry I meant to check the CV Bolts. I have seen so many with missing or snapped bolts.

    To check mounting I would get a friend to bring the clutch to the bite with the brakes on and see if the engine clunks on it's mounts.
  14. Or jack it up one side, put it in gear and try to turn the wheel that is in the air in either direction.
    If its CV joints you will see bits turn relative to each other that shouldnt.

    If its in the gearbox, the whole driveshaft attached to the wheel will turn and then stop.

    If its a front gearbox mounting you would expect to see missing bits and shiny metal at the front where it is hitting..

    The two prongs at the front mounting should be clamped by a metal block with two grooves in it for the prongs and two big bolts.

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