Passenger brake light not working.

[Will L.]

You said changed when the pulley stared knocking? So pulley went bad and that's when it beat up the mains?

I'm very interested in this, because of all the lower ends that came apart, wether crank or mains, I've almost always seen bad weight of the front of the shaft. Only exception was 1 engine that got new balancer and pulley at 150,000 mile interval then the mains cracked at just over 500,000. Must have been a sister motor, because we got a little chip out the drain hole just like you described. Only that truck continued to be drivin like it was stolen, made it about 10,000 more.

 

[M.Novak]

Yes, and NO. The pulley was making a lot of racket, mostly just on acceleration, idling, it wasn't too bad. Sounded like a rod knocking! All of the rubber cushion material between the two sections of the pulley was gone and the pulley was banging back and forth on the hub that fastens it to the balancer. The balancer rubber was cracked too, but it looked to be normal heat/age cracks. Replaced both as a pair. They were changed sometime in the distant past, before June 2008 and 381,922 miles when I started keeping really good records. The small piece of main web came out on April 17, 2011 at 449,205 miles. My 20 year old was driving it to college to be a diesel mechanic, when was the last time you told a 20 year old to take it easy on something and they actually did it? I'm guessing it got driven even harder so that it could get that upgraded overhaul and hotter injectors kids like him want until the end of March 2015 and with an additional 67,000 miles. He did get his training though, now he works as an apprentice diesel locomotive mechanic at the same place I do. It's kind of cool to help train your son in your craft! Hope this clears things up a little better for you. Mike

 

[M.Novak]

I need to update the mileage on that 6.5 with the broken crankshaft, it has a few more than previously stated. It has 516,381 miles, I don't know where I got the 336 from. Too many engine performance parameter numbers involved with performing my job at the RR I guess!