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Timing chain query

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by RickC, Mar 3, 2019.

  1. RickC

    RickC Senior Member

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    Hi all,

    I have a 2006 C200k estate.

    Can anyone advise me whether my engine has a duplex timing chain and if so are these more durable than the much maligned single item?

    Thanks
     
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  2. LostKiwi

    LostKiwi Senior Member

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    M271 with simplex chain.
     
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  3. Wighty

    Wighty Senior Member

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    Yep , single chain same as me buddy :D . What mileage has the car got now ?
     
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  4. OP
    RickC

    RickC Senior Member

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    Its on 87k mate
     
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  5. Wighty

    Wighty Senior Member

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    There are a lot of horror stories on forums about the M271 chain , obviously not all have problems .
    But those that do start around 80k , the lucky owners hear some extra noise from the chain for a few seconds on cold start as a warning before the chain jumps on the worn sprockets .
    It can cost just over £1000 to have a new chain and sprockets fitted .
     
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  6. OP
    RickC

    RickC Senior Member

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    Thanks. Is there a tensioner upgrade or similar?
     
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  7. Wighty

    Wighty Senior Member

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    I can't answer about upgrades , I think the replacement sprockets are made of stronger steel ?
    Plenty of stuff all over the tinternet/forums if you search M271 chain problems .
    There is a company called www.m271 that sells all the kits/parts
     
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  8. LostKiwi

    LostKiwi Senior Member

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    As Wighty says the sprockets are the issue. Some seem to have as much resistance to wear as brie. The teeth wear down and the chain then skips a tooth or three or more. Usually they do this at start up ( no oil pressure on the tensioner, most resistance to turning).
    A rattling noise on first start of the day is an early warning.

    I did see a thread on another site about a tensioner produced by another company that has caused non return valve in the tensioner to hold oil pressure but not sure how much if any help that would be.
     
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  9. OP
    RickC

    RickC Senior Member

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  10. Ken_R

    Ken_R Senior Member

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    As in cheese!
     
  11. OP
    RickC

    RickC Senior Member

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    I know. I added a smiley icon but for some reason it didn’t happen.

    Very good-made me laugh
     
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  12. rifiki

    rifiki Senior Member

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    M272 have same problem, how many actually fail? Nobody knows and on a forum you usually only head bad news.
     
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  13. OP
    RickC

    RickC Senior Member

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    Thats true, thanks. Guess I will just listen carefully in the mornings...
     
  14. Blobcat

    Blobcat Moderator

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    No, M272 have duplex chain. M272 suffers (or at least the early ones) from balance shaft sprocket wear - also made from cheese. Plenty of detail on here and there's lots of websites where you can check your engine number to see if it's affected.
     
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  15. Wighty

    Wighty Senior Member

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    It also depends on how long you intend to keep the car and what it's worth to you . I recently took the top cover of my engine off to check the chain and sprockets (70k) and all looked good .
    I'll keep changing the oil every 5k as protection , but I'm probably only looking at keeping it for another 1-2 years ?
    The cost of doing/paying £1000+ for chain and sprockets on my car is probably near 25% of the cars value .
    I will keep weighing this up though the longer I keep the car , sometimes it's easier to stick with a reliable well serviced older car where all its faults are known already .
     
  16. John Laidlaw

    John Laidlaw Senior Member

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    Between that and the fact you service yours every second week :rolleyes:
     
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  17. OP
    RickC

    RickC Senior Member

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    Totally agree with that. My last car was a £50k + Discovery and I had 11 warranty claims in the first 12 months. What is the point? And it is very satisfying, finding something older that you love and looking after it...
     
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  18. mattkh

    mattkh Senior Member

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    Surely, this means that the tensioner should be the first one to be invetigated/changed rather than the chain.
     
  19. Oldspanners

    Oldspanners Senior Member

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    If you have just bought this car apart from checking the timing chain and sprockets, I would check that the gearbox has had a complete oil and filter change (assuming it's an automatic every 40K miles) at least once and if one hasn't been done recently another is due and prudent.
     
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  20. Oldspanners

    Oldspanners Senior Member

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    It isn't the tensioner that's the problem it's the worn sprockets and chain that put the tensioner at the limit of its travel.
     
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