Quote:
Originally Posted by dieselbenz1
I have never heard of a cam breaking on these engines?
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I'm still not sure what caused the camshaft to break. I rolled in a new timing chain several months ago. I had driven it for about 5000 miles since that time without incident making several long interstate trips. I had the cruise set on 75 mph about an hour from home when I felt a small thump and the speed fell as if you turned off the key. Luckily I was near an exit and found a wide place to get over. I found a crack in the cam cover so I knew it was bad. Towed home and found the cam gear broken into small pieces and the cam shaft broken just behind the gear location. No damage to the block or crankshaft thankfully. The timing chain is still good also. I'm now waiting on the machine shop to finish with the head. I can only see one valve bent and only have a mark on that piston (number 3). I have another vehicle to drive so I can take my time with this. What I'm most worried about is getting the proper alignment of the cam, crank, and IP when going back together. Buying lots of tools! This is my first time this deep inside a Mercedes diesel. I've printed bunches of instruction from the 126 online service manual.