[W126 Coupe] Can someone help me with a vin number

[airedale at sbcglobal.net]

.. My pristine '91 560SEC snapped a camshaft for the second time in less than a month.

That must have been the situation. The car is back and running wonderful again. He said the rear cam tower was .004 out of alignment and the leading machine shop here in Kansas City did the work in making it right. The cam was replaced under warranty and I paid a total of $500. for a new head gasket and valve. One valve was bent this time. The rest went toward labor.
  ----- Original Message ----- 
  From: Matt Petersen 
  To: 'Mercedes Coupes Mailing Lists' 
  Sent: Saturday, November 19, 2005 12:32 PM
  Subject: RE: [W126 Coupe] Can someone help me with a vin number


  A common issue in OHC motor's with a warped head after overheating is alignment of the cam bearing holes in the towers.

  Checking of the bearing surfaces on the cam and in towers should highlight unusual wear if this is the cause.

  Matt.



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  From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of airedale at sbcglobal.net
  Sent: Sunday, 20 November 2005 7:30 a.m.
  To: Mercedes Coupes Mailing Lists
  Subject: Re: [W126 Coupe] Can someone help me with a vin number


  They did replace the oil tube, on both sides, at the last cam change. When I suggest the lubrication issue they mentioned that the oil tubes were actually fed through this tower. Now that I look at your picture that does not seem correct, the tube system feeds them as well as the cam lobes. Thanks for your thoughts and picture.
  John
    ----- Original Message ----- 
    From: Chet Hwilka 
    To: Mercedes Coupes Mailing Lists 
    Sent: Saturday, November 19, 2005 7:44 AM
    Subject: RE: [W126 Coupe] Can someone help me with a vin number


    .. My pristine '91 560SEC snapped a camshaft for the second time in less than a month.

     

    I don't recall anyone else on this list having a snapped camshaft before and for you to have 2 would suggest to me that it's not defective cams.   When the first cam was removed was there any signs of excessive wear or heat on the bearing surfaces?   Maybe the last cam tower isn't getting enough oil, causing the cam to heat up in that bearing, expand, seize up and snap.

     

    Did your mechanic replace the oil tube?  The plastic connectors can become brittle and break, not allowing oil to get to the cam surfaces.

     

    Chet

     

     

     

     



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