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Thermostat bypass pipe e270 CDI and c270 CDI

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Sponcom, Jan 4, 2013.

  1. Sponcom

    Sponcom Senior Member

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    Your Mercedes:
    C class/2002/270CDI
    Can anyone tell me the reason an E270 CDI thermostat does not have a bypass pipe but a C270 CDI does?

    Many thanks

    Paul
     
  2. mersum1es

    mersum1es Senior Member

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    Your Mercedes:
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    Last edited: Jan 5, 2013
  3. rpe2

    rpe2 Senior Member

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    Your Mercedes:
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    A change in engine design.

    The earlier 611/2/3 engines have one, the later (electronic turbo/ egr) 646/7/8 engines do not.

    Hence the need to order the correct stat.
     
  4. mersum1es

    mersum1es Senior Member

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    Your Mercedes:
    W212/-09/350CDI, W219/-07/320CDI, EX:W220/-01/320CDI, EX:W211/-04/320CDI, EX:W210/-01/270CDI
    Thanks, didn't know that W211 engines,and only W211, were all OM647s...(though OP didn't said which model E, W210 has OM612).
     
    Last edited: Jan 5, 2013
  5. OP
    Sponcom

    Sponcom Senior Member

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    Your Mercedes:
    C class/2002/270CDI
    Thanks for the replies.

    I asked the question as a replacement bottom end from an E class 270 CDI was fitted to a C class 270 CDI 2002 (612 engine). However during assembly it was realised that the E class bottom end had no channel for the bypass pipe. The engine was fitted with the appropriate thermostat with no bypass and appears to run fine.

    I was just curious if there was a particular reason for the water channel fed by the bypass pipe.

    Thanks
     

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