GregH Posted December 3, 2006 Share Posted December 3, 2006 I've got an '02 7.3 that came in knocking, puffing out the intake, and misfiring. Foound a #5 exhaust rocker arm support fractured, and the intake rocker had a crack in it. Counted the knocks while idling (320 per minute at 650 rpm idle) and decided to pull the rocker arms off #5. Counted knocks again, and found a quieter knock at 650 rpm. Pulled the motor, found imprints of the valves on top of the #5 piston, broken #3 cooling jet, and the head of the inboard #5 rod cap bolt was snapped off. This short block was replaced here (by a very talented tech) 2 years/80,000 miles ago. Vehicle has 144,000 miles now. Any idea what would cause this? A programmer is installed in the truck, but it's a pretty mild one. Vehicle is a work truck, and it shows. No excessive weight to carry or pull, but I had to chisel through 3 inches of red clay mud to find the chassis... I'll upload some pictures... Quote Link to comment Share on other sites More sharing options...
GregH Posted December 3, 2006 Author Share Posted December 3, 2006 Here are some pictures: Quote Link to comment Share on other sites More sharing options...
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