2006 CM870 high EGTs

[JBaird]

The dyno results show the engine to be solid. It was over fueling and only produced 28.1 pounds of boost. They were convinced the lack of boost contributed to the over fueling and high EGTs. They pulled the actuator off the the turbo disassembled and added approximately 4mm of shims between the housing and spring to tighten the spring up. It took 3 tries of adding and removed shims, but got the engine to produce 38 lbs of boost on a hard pull. The truck woke up and on anything over a 30% load the EGTs fell on average over 250 degrees. It seems like a cheesy repair, but the truck runs good.