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Thread: 54bhp cdi idle rough as nails in a tin box.

  1. #11
    Join Date
    Feb 2011
    Location
    Lewes
    Posts
    733
    Could be cam chain? Try lifting the cam chain off the sprocket - the slipper auto tensioner is known to break.

    John

  2. #12
    Join Date
    Apr 2009
    Location
    Ecosse
    Posts
    3,760
    Quote Originally Posted by Heinkeljb View Post
    Could be cam chain? Try lifting the cam chain off the sprocket - the slipper auto tensioner is known to break.

    John
    If the above is suspect - investigate ASAP. If the chain jumps the sprocket your motor is toast.

  3. #13
    Join Date
    Nov 2004
    Location
    North Weald, Essex
    Posts
    165
    Agreed cam chain sounds more plausible or maybe hydraulic cam follower. My car makes a rattle on first start up sometimes & I think it's a dodgy cam follower that takes a few seconds to pump up with oil. http://www.fq101.co.uk/how-to-guides...ne/412-tappets

  4. #14
    Join Date
    Mar 2010
    Location
    london
    Posts
    105
    Well thanks everyone for the input.After doing some research and speaking to some cdi owners in other forums, It turned out to be the rattly clutch system rivets broken, which I had been told by quite a few on other forums.

  5. #15
    Join Date
    Mar 2010
    Location
    london
    Posts
    105
    Quote Originally Posted by Mr T View Post
    I think this could be the straps on the clutch mechanism have failed. I had this happen many many years ago. I thought it was a big end bearing failure, as that's what it sounded like! The car ran & drove fine, it was only on tickover it made the noise, knock knock knock..... I drove it for a few days to work & back. Then one morning it wouldn't select a gear, just a thuding sound.
    On investigation the finger springs on the clutch cover had inverted because a couple of straps had snapped. New clutch sorted it out.
    Thank you. Spot on.

  6. #16
    Join Date
    Nov 2004
    Location
    North Weald, Essex
    Posts
    165
    Glad you got to the root of the cause. Some faults are a real pain to diagnose!

  7. #17
    Join Date
    Mar 2010
    Location
    london
    Posts
    105
    Quote Originally Posted by Mr T View Post
    Glad you got to the root of the cause. Some faults are a real pain to diagnose!
    Just orderd the new clutch kit. Hopefully it arrives by next week.

  8. #18
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,398
    My 450 Cdi having neary made it all the way to the moon in terms of total mileage developed a worrying metallic clunky rattling sound a months ago. So bad I did not dare even starting engine so has been riding my push bike to get around.
    Found the fault yesterday. The exhaust is the culprit. A baffle or pipe inside is loose causing a loud metallic rattle.
    Drives a Smart Cdi - 65 to 85 MPG

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