Some 2009-2013 Mazda6 vehicles may exhibit an unusual humming noise from the front wheel bearings. This may be caused by muddy water entering the wheel bearing(s), causing the bearing(s) to rust. A new bearing seal design has been improved to eliminate this concern.

1. Verify the concern.

2. Raise the vehicle on a lift.

3. Turn the front wheels by hand to identify the side(s) with the issue.

4, Perform a wheel bearing excessive play inspection according to the MS3 online instructions or workshop manual section 03-11.

5. Replace the affected wheel bearing(s) per MS3 online or workshop manual section 03-11.

6. Be sure to replace the retaining clip, dust cover and locknut with new components during the wheel bearing replacement.

Part number                   Item

GS3L-33-047A………….Wheel bearing (2.5L)

GS4H-33-047A………….Wheel bearing (3.7L)

GE4T-33-048……………Retaining clip (2.5L)

D651-33-042A…………..Locknut (2.5L)

GS4H-33-048……………Retaining clip (3.7L)

GAM6-33-042…………...Locknut (3.7L)

GS3L-33-271…………….Left dust cover (2.5/3.7L)

GS3L-33-261…………….Right dust cover (2.5/3.7L)

Be sure to replace the retaining clip (A), dust cover (B), locknut (C) and wheel bearing (D).

Be sure to replace the retaining clip (A), dust cover (B), locknut (C) and wheel bearing (D).

 

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