Inspection of the Belts
Detroit™ Gen 5 Heavy Duty engines utilize a specially designed belt material which is exclusive to the Original Equipment Manufacturer (OEM). Replacement with an aftermarket part may lead to shortened maintenance intervals and excessive noise. Consult with an authorized Detroit™ service outlet to obtain proper engine belts.
Belts will track slightly forward on the non-grooved pulleys when the engine is running. Once the engine is turned off, the belt will re-center itself. Do not use any type of cleaning solvent on the rubber parts of the tensioner or on belts. Detroit does not approve the use of belt dressing or other like products as this may result in premature belt wear. The belts should be replaced as recommended in the maintenance tables using the appropriate engine duty cycle, Preventive Maintenance Tables.
Inspect as follows:
- Check the maintenance records to be sure the belts are not overdue for a maintenance interval, Preventive Maintenance Tables. Have the belts replaced if necessary.
- Inspect the belt contact surfaces for chips, flaking, cracks, and discoloration using the guidelines listed below. If any damage is noted, have both belts replaced.
- 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.
