Cooling System - Fan Installation On Water Pump Flange

Classification:
EM96-008

Reference:
NTB96-100

Date:
October 23, 1996

FAN INSTALLATION TO WATER PUMP FLANGE

APPLIED VEHICLE:
All with water pump mounted fan

SERVICE INFORMATION

The fan mounting flange of the water pump may become loose on the shaft if the fan, fan coupling, or fan pulley (water pump pulley) are not properly installed during a repair. The incident may be exhibited as a screeching noise from the engine when starting cold. When removing or installing the fan, fan coupling or fan pulley, always perform the procedure listed below.

SERVICE PROCEDURE

1. Turn the ignition switch to off.

2. Loosen the alternator then remove the drive belt. Do not leave the drive belt in place and release the drive belt tension by removing the fan pulley. (Releasing the drive belt tension by removing, the fan pulley may complicate component re-installation).

3. Remove the fan, fan coupling, fan pulley and any other components required for the service you are performing.

Figure 1:

4. Inspect the fan coupling for wobbling (Figure 1), oil leakage or bent/broken bimetal before assembly.

5. Carefully Install the fan, fan coupling and fan pulley. Torque the M6 x 0.8 nuts and screws securing the fan to the fan coupling and the fan coupling to the water pump flange to 4.3-7.2 ft. lb. Install the drive belt only after the fan and fan coupling to water pump flange bolts/nuts have been properly torqued.

NOTE:
Proper alignment of these components is essential. Improper alignment will cause them to wobble and may eventually cause the fan to separate from the water pump causing extensive damage.

Figure 2:

6. After assembly, verify the fan does not exhibit any wobble or flapping while the engine is running. If any wobble or flapping is observed, it must be corrected before the vehicle is released to the customer.

CAUTION:
When the engine is running, keep hands, clothing and jewelry away from moving parts such as drive belts and fan.