N14 Base Engine Troubleshooting and Repair Manual – 008-036   Fan Hub, Belt Driven

NOTE: Do not discard the fan spacers. The spacers provide the thickness needed to install the fan in the correct position.

Remove the fan.

Turn the adjusting screw counterclockwise to release tension. Remove the adjusting screw, and remove the belts. Refer to Procedure 008-002.

NOTE: Optional two capscrew or four capscrew designs are available.

Remove the capscrews and the fan hub.

Remove the fan drive belts. Refer to Procedure 008-002.

Remove the fan drive belts. Refer to Procedure 008-002.

Inspect the fan hub for the following:

• Freedom of rotation
• Cracks
• Grease seal leakage.

Repair or replace the fan hub if the fan hub does not rotate freely or if there is evidence of cracks or grease seal leakage.

Measure the fan hub end clearance. The end clearance is dependent upon the fan hub style.

Replace the fan hub if the end clearance is not within specifications.

The end clearance on “Through-Bore” fan hubs (with bearing spacers) must be 0.08 mm to 0.40 mm [0.003-inch to 0.016-inch].

The end clearance on “Step-Bore” fan hubs (without bearing spacers) must be 0.08 mm to 0.25 mm [0.003-inch to 0.010-inch].

Install the new fan hub and the capscrews.

Use your fingers to tighten the capscrews.

Install the fan drive belts onto the fan hub and the accessory drive pulley. Do not tighten the belts.

Install the fan.

Adjust and tighten the fan drive belts. Refer to Procedure 008-002.

Tighten the mounting capscrews to the vehicle manufacturer’s specifications.