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Axle Noise Diagnosis

Part 6 - Service the Condition
From MasterTech October 1999
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Service the Condition

Once the axle inspection and analysis reveals a specific issue, you can make a specific adjustment or repair to reduce the sound level coming from the axle. Consult the appropriate service information source for details on the axle adjustment you need to perform. For example, if you find that you need to adjust pinion depth, see the adjustment details in the differential and driveline section of the service manual (Fig. 25).

Figure 25 Use the available service information sources to obtain the details on the service or adjustment procedure you need to perform.

Or, if your diagnosis leads to installing new differential side bearings, refer to the removal and installation section of the service information source. And don't forget to check for any technical service bulletins (Fig. 26) that may include late-breaking infor- mation and procedures.

Figure 26 Technical service bulletins provide service procedures and other information not published elsewhere. Always check for TSBs related to the vehicle and symptom you are working on.


Verify the Adjustment .............................

Verifying any adjustment you make to the axle involves a road test to determine if the objectionable sound still exists. Be sure to road test the vehicle in different drive modes through all speed ranges, just as you did originally. Listen carefully to decide whether the sound has decreased or been eliminated, or has not changed. If everything sounds good, return the vehicle to the customer. If the concern has not been rectified, seek assistance through the STAR Center or your zone tech advisor.

Axle diagnosis should be done in a systematic way in order to make a successful adjustment.

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Last Update: December 20, 1999