3116 and 3126 Truck Engines Failures Piston Contact

Multiple cylinders displayed outlines of the piston crown and the piston crater on the valve heads. This intermittent contact indicated a valve to a piston contact. This contact can be seen in the following picture. Look at the valve stems for the following items.

  • Oil coking problem on sticky valves
  • Adhesive wear
  • Bent valve stem or stems
  • ECM for logged conditions over speed

Illustration 7 g01183476
Piston contacts on valves

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