Routine Preventive Maintenance Table 7. 3. In the area where the belt contacts the pulleys there will be a polished shine on the pulley created by the belt contact. If misalignment is occurring, the belt may be riding off-centered on the pulley. In these scenarios, it may be necessary to take the vehicle to an authorized Detroit™ service outlet. Inspection of the Cooling System 64 All information subject to change without notice. Copyright © 2022 DETROIT DIESEL CORPORATION DDC-SVC-MAN-0217 Poly-V-Belt Inspection Concerns PILLING UNEVEN RIB WEAR MISALIGNMENT GRAVEL PENETRATION