A/C Idler Pulley Bearing - Squeal/Whine Noise

Classification:
EM97-002A

Reference:
NTB98-009A

Date:
May 1, 2001

1996-2000 PATHFINDER; A/C IDLER PULLEY BEARING NOISE

This amended version of NTB98-009 contains updated Applied Vehicle, Service Information, Parts Information and Claims Information sections. Please discard all previous copies of NTB98-009.

APPLIED VEHICLE:
1996-2000 Pathfinder (R50)

SERVICE INFORMATION

If the A/C idler pulley bearing in an Applied Vehicle has a squeal or whine noise at idle, there is a new idler pulley assembly and idler pulley bracket set available to address this incident.

Use the Service Procedure below to diagnose and repair this incident, if it should occur.

SERVICE PROCEDURE

Diagnosis & Replacement

1. To isolate the noise source use a stethoscope (or similar tool) and listen to the A/C idler pulley bearing.

2. If the bearing is noisy, replace the idler pulley assembly and idler bracket with the appropriate parts from the Parts Information section of this bulletin as follows:





A. Loosen the A/C idler pulley assembly nut (see Figure 1).

B. To release the tension on the belt, loosen (counter clockwise) the pulley adjusting bolt (see Figure 1).

C. Remove the pulley assembly nut. Remove the pulley assembly.

D. Remove the idler pulley bracket. On 2000 models also remove the tube clip.

E. Install the new idler pulley bracket (and tube clip on 2000 models). See the Parts Information section of this bulletin.

NOTE:
The idler pulley bracket and idler pulley in this bulletin must be replaced as a set.

F. Install the new idler pulley assembly. See the Parts Information section of this bulletin. Use the following Inspection & Adjustment procedure to adjust the belt, then torque the pulley assembly nut to 22.4-28.9 ft-lb (30.4-39.2 N.m).

Inspection & Adjustment

1. Inspect the belt for cracks fraying, wear or oil adhesion. If necessary, replace with a new belt.

2. With the engine cold, push on the belt midway between the pulleys to check the drive belt deflection (belt tension).





3. Adjust the belt if the deflection exceed the limits from the table shown.





PARTS INFORMATION

CLAIMS INFORMATION





Submit a Primary Failed Part (PP) line using the claims coding as shown.