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Cam chain fault then major problem.

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by hotch743, Nov 1, 2012.

  1. hotch743

    hotch743 New Registration

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    Joined:
    Dec 26, 2011
    Location:
    north ferriby. east yorkshire. england.
    Your Mercedes:
    c class coupe 1.8 w203 03
    Hello all, first post and “OH” need advice. Bought a 03 C180 with 71.000 on the clock no initial bad sounds, faults,drives well and has the MERCEDES renowned badge on the bonnet, and got it for a good price, what more could you want.
    1000 miles later a misfire, checked it all found nothing, then wouldn’t start, towed it to a merc specialized garage. They checked it out and told me timing CHAIN stretched,” what”. Had them fit a new chain and tensioner as they said that not all cam chain faults cause damage to the cam timing.
    £500 later still wouldn’t start, chain had jumped 2 teeth on inlet cam and one tooth on exhaust cam.
    Took it stripped top end all inlet valves bent all exhaust need grinding in, replaced inlet valves and guides, inspected piston heads, no deformation. Rebuilt engine with the help of a cam timing jig tool.
    Started, ran perfectly 10 months 1200 miles then engine management light and a knocking tapping sound from back of engine. Took to a known mechanics who used an inspection camera and told me that No 4 piston was scrapping the bore, was caused by valve hitting crown.
    So engine needs to come out then rebore and oversize pistons, on a Merc, pardon.
    Any help and ideas? Anyone removed an engine? Where would you recommend for engine work.
    Sorry for first post, but it takes a bit of believing.
     
  2. ernieh

    ernieh Senior Member

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    Joined:
    Nov 20, 2006
    Location:
    Scotland, East
    Your Mercedes:
    205 / 67 / C220 d
    Unfortunately timing chain problems are common on your engine as it is only a single chain and is prone to stretching - most others are double.

    As regards the piston problem, it sounds like there was some damage that wasn't seen on inspection the first time. If you're lucky and the bore isn't damaged, you might get away with just one new piston, but have the con-rod checked as well because it might have taken a knock during the first episode.

    As regards engine removal, if you only replace one piston, it might be possible to remove the sump after dismantling the suspension and lifting the engine a bit. Hopefully someone will see this and advise more fully.

    Sorry to hear of your problem and hope you get it sorted OK.


    Ernie
     
  3. television

    television Always remembered RIP

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    Joined:
    Mar 14, 2005
    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    As ernieh and quite a few 271 engines doing this, the head will have to come off to see the extent of the damage :(:(
     
  4. Alex Crow

    Alex Crow Senior Member

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    Joined:
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    Location:
    Super Suffolk
    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    You cannot remove the piston without taking the head and sump completely off - this makes it an engine out job in the workshop.
    As above regarding doing the minimum though, if the bore will clean up just 1x new piston is going to be about £800 cheaper than a full rebore etc.
     

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