Discovery II (LT) V8-4.6L (2003)
Compressor/Pump: All Technical Service Bulletins
Engine - Drive Belt Noise
No: 12/02/04/NAS
*FGN: LT303
Ref:
Issue: 2
Date: 21 December 2004*
Updated information is noted by asterisks.
Diagnostic Guide for Engine Drive Belt Noise
AFFECTED VEHICLE RANGE:
*Discovery Series II (LT)
3A771055 - 4A870624*
SITUATION:
NOISE FROM THE FRONT OF THE ENGINE
Pulley alignment and related issues can result in noises originating in the serpentine belt and accessory drive system.
RESOLUTION:
DETERMINE SOURCE OF NOISE FOR PROPER REPAIR
Upon customer complaint of engine belt or accessory drive noises, follow the diagnostic procedures in this bulletin to isolate the root cause and provide
the proper repair procedure.
PARTS INFORMATION:
Information Only
DDW WARRANTY CLAIMS:
Information Only
Normal warranty policy and procedures apply.
Material allowance is included in labor operation.
REPAIR PROCEDURE
DETERMINE SOURCE OF NOISE
WARNING:
When working with running engines in the vicinity of rotating pulleys and other moving parts, fingers, hair, jewelry, tools and loose clothing must be
kept clear of moving components.
NOTE:
The noise may be more likely to occur when the engine is cold (i.e. after the car has been left stationary overnight).
1.
Determine if the noise is generated by the drive belt system.
^
Start the engine and allow it to idle.
^
Stand at the front of the vehicle with the hood open and listen to the engine.
^
Identify that the noises originate from the drive-belt system.
^
Inspect the belt as it passes over the idler pulleys for front-to-back movement over the pulley (tracking), which may help to indicate a
misalignment problem.
^
Identify at which pulley the noise is generated, or which area of the drive belt system (top/bottom, left/right) the noise appears to come from.