L9 Connecting Rod Bearing Recommendation for Service/Aftermarket - QSOL Reference: TSB200154. Engines were initially produced with lead-free connecting rod bearings, Part Number 5283365 for upper bearing and Part Number 5283364 for lower bearing (kit Part Number 4309346). Starting March 2019, the plant used leaded connecting rod bearings, Part Number 3966244 for upper bearing and Part Number 3950661 for lower bearing (kit Part Number 5579381). The purpose of this TSB is to clarify the use of lead-free and leaded connecting rod bearings.
X15 CM2350 X116B Bracket Upfit for Repeated 12 Rib Accessory Drive Belt Malfunction on Paccar -
QSOL Reference: TSB200158. Long belt spans between the fan hub and the crankshaft are susceptible to excessive belt jump during start up and shut down.
B6.7 Cylinder Block Porosity - Lubricating Oil in Coolant or Coolant in Lubricating Oil - QSOL Reference: TSB200162. Cylinder block porosity location is internal to the cylinder block and cannot be seen from the outside.
This document contains generalized information to cover situations where gasoline or diesel exhaust fluid has been found in the diesel supply.