ISBe/ISB Series Engines – 008-002   Drive Belt, Cooling Fan

CAUTION  The belt tensioner is spring-loaded and must be pivoted away from the drive belt. Pivoting in the wrong direction can result in damage to the belt tensioner.

Pivot the tensioner to relieve tension in the belt, and remove the belt.

NOTE: The belt tensioner winds in the direction that the spring tang is bent over the tensioner body. To loosen the tension on the belt, rotate the tensioner to wind the spring tighter.

Inspect the drive belt for:

• Cracks
• Glazing
• Tears or cuts
• Hardening
• Excessive wear.

Inspect the idler pulleys for wear or cracks.

Plastic pulleys often have a build-up of road dirt and belt material that is not to be confused with wear.

The dirt can be removed with a suitable tool to check for wear.

Clean, check and reuse idlers with a build up of dirt, rather than replacing.

Replace the belt tensioner idler. Refer to Procedure 008-087.

Inspect the drive belt pulleys and idlers for cracks or broken grooves.

To replace the fan pulley, the alternator drive belt, the water pump tensioner. Refer to Procedure 008-039.

To replace the cooling fan belt tensioner. Refer to Procedure 008-087.

To replace the crankshaft pulley, contact an Authorized Cummins Repair Location.

CAUTION  The belt tensioner is spring-loaded and must be pivoted away from the drive belt. Pivoting in the wrong direction can result in damage to the belt tensioner.

Route the drive belt on the engine, except for the water pump pulley.

Pivot the tensioner and install the drive belt, slipping the belt over the water pump pulley last.

Release the tensioner to apply tension to the drive belt.

Check the alignment of the belt with the tensioner and the rest of the front end auxiliary drive.

Operate the engine and check for belt squeal. Excessive belt squeal indicates belt slippage.