Tuesday, March 12, 2019

Engine - Drive Belt Noise Diagnosis

2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Hybrid Technical Service Bulletin # 10-002 Date: 100112



Engine - Drive Belt Noise Diagnosis



Classification: EM09-013



Reference: NTB10-002



Date: January 12, 2010



DRIVE BELT SYSTEM NOISE DIAGNOSIS



2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Hybrid Page 324



APPLIED VEHICLES All Nissan



IF YOU CONFIRM



There is noise coming from the drive belt(s), or drive belt pulley(s),



ACTION



Use the flow chart in this bulletin to help diagnose and identify the source / cause of the noise.



CLAIMS INFORMATION



Refer to the current Nissan Warranty Flat Rate Manual and use the indicated claims coding for any repairs performed.



2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Hybrid Page 325



DRIVE BELT / PULLEY NOISE DIAGNOSIS FLOW CHART



2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Hybrid Page 326



Auto tensioner Inspection (if equipped)



1. With the engine running at idle and the AC turned ON, observe the pulley angular (side to side) movement (see Example 1):



^ See above table for maximum movement specification.



^ Visual comparison of movement with a known good vehicle is recommended.



2. With the engine running at idle and the AC turned ON, observe the pulley axial/lateral (back and forth) movement (see Example 2):



^ Maximum movement specification is 1 mm.



2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Hybrid Page 327



^ Visual comparison of movement with a known good vehicle is recommended.



Idler Pulley / Manual Tensioner Inspection (if equipped)



No more than 1 mm of pulley rock should be visible.



Alternator One-way Clutch Pulley Inspection



CAUTION:



Be careful not to damage the rotor.



NOTE:



The following steps can be done while the alternator is installed on the vehicle if the drive belt is removed and the alternator electrical connectors are



disconnected.



1. Secure the rotor using a medium size screwdriver and a rolled shop towel.



2. Turn the pulley clockwise when viewed from the front.



^ Pulley should be locked.



^ If it rotates in both directions, replace the alternator.



3. Turn the pulley counterclockwise when viewed from the front.



^ Pulley should turn with some dragging



^ If it locks or has unusual resistance, replace the alternator.

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