Question for the mechanics amongst you.

Discussion in 'Tech/Mech General' started by lorger, Aug 3, 2014.

  1. lorger

    lorger Funster

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    Just drove from Harwich home to Dumfries today after our holiday in Scandinavia, a couple of times when I pressed the accelerater the revs shot up to 3000 for a split second then back down. It was similar in effect to clutch slipping but I hadn't changed gear for over 20 mins so it wasn't that. I have a fiat ducato on a 2010 plate 2.3d apart from this I have coverd just over 2000 miles with no issues, it will be due a service soon so will ask my mechanic guy when I take it just looking for a heads up.

    Gerry
     
  2. jonandshell

    jonandshell Funster

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    Slipping clutch caused by wear or contamination, or your clutch cable is too tight.
     
  3. Wildbill

    Wildbill Funster

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    Gerry oil leek on to clutch possible cases worn clutch but with out driving it I would not know
    you bet me to it john
     
  4. RS_rob

    RS_rob Funster

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    DMF Duel Mass Flywheel slipping
    they dont like High Gears & Low revs, change down on hills.
     
  5. olley

    olley Funster

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    DMF's don't slip, clutch plates do, either that or you had wheel spin, I would say the clutch is much more likely.

    Ian
     
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  6. RS_rob

    RS_rob Funster

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    the springs wear on a dmf & cause clutch slip
     
  7. DP_JAY

    DP_JAY Funster Life Member

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    Sounds like the DMF failing, had that on my car & replaced it with a solid flywheel.
     
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  8. timdownieuk

    timdownieuk Funster

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    If the engine revs really did rise (and not just an instrument anomaly), it's got to be clutch slip. It may or may not be related to DMF issues but ultimately, any disparity between road speed and engine revs must involve the clutch.

    Get it seen too before you find yourself stranded. You've had a warning. Don't ignore it.

    Tim
     
  9. lorger

    lorger Funster

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    Thanks for the replys it certainly sounded like clutch slip to me but didn't think it would happen when I hadn't changed gear for more than 20 minutes. Will get it checked out.
     
  10. pappajohn

    pappajohn Funster Life Member

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    If a clutch slips under sudden load it will continue to slip until... A) the load is removed
    B) the road speed closely matches the engine speed.

    The engine speed will not momentarily rise then drop in a second or so.

    Dont know how old the van is (yes i do, i just reread the post) but i suspect new enough for the tachometer to be ECU controlled so i suspect an electronic glitch.
     
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  11. RS_rob

    RS_rob Funster

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    DMF's are :

    Sugar
    Hotel
    India
    Tango
     
  12. timdownieuk

    timdownieuk Funster

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    Well the important question is was it just a tacho needle movement that you noticed or could you actually hear the engine revs rise? If the latter, it's got to be the clutch (or, in very slippery conditions, wheel spin)
     
  13. pappajohn

    pappajohn Funster Life Member

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    Just twice in 2000 miles....i think not.
     
  14. RS_rob

    RS_rob Funster

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    If the springs on the DMF wear & they do because it is a crap design you will hear a rise in engine speed & notice the Tacho rise in speed however your actual speed will stay the same or reduce due to the clutch slip.

    Best replaced with a standard flywheel & clutch or adjust your driving style.
     
  15. lorger

    lorger Funster

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    The motorhome after our recent trip has now done 24k and never had a problem with it, when you take off from a standstill and go up through the gears there's no issue. It has only happened when I have been sitting about 60mph and pressed accelerator to overtake, the revs shoot up on the rev counter and you hear the engine race for no more than a second then its back to normal. Even on very steep hills it pulls away no problem and reversing up hills isn't an issue.
     
  16. RS_rob

    RS_rob Funster

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    Defo DMF pulling all that weight around all day long...............................................
     
  17. RS_rob

    RS_rob Funster

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  18. timdownieuk

    timdownieuk Funster

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    Well I don't know enough about DMFs to say whether it's a factor or not but revs rising without road speed rising is either wheelspin or clutch slip. There are no other options.
     
  19. JJ

    JJ Funster

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    Sell it and get a new one...

    You know you want to.


    JJ :cool:
     
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  20. RS_rob

    RS_rob Funster

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    No............................. just put a standard flywheel & clutch in it when you can..................... maybee 2 years time just drive it carefully
     
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