Technical Service Bulletin Noise From Front Wheel Seal

Subject: Noise From Front Wheel Seal  Models: 911 Carrera/911 Turbo 1988

Bulletin Number: 89 – 04

From production date October 1988, a modified front wheel radial sealing ring is installed. The Part Number remains unchanged.

When repairing cars with squeaking or whistling noise  from the front wheel seals (prior to the above production date) install new type seals which can be identified by a molded rubber dot next to the lettering (arrows in figure).

The space between the sealing lips of the sealing ring should be filled with wheel bearing grease prior to installation. Seals without the marking (rubber dot) may be used up on 924, 944 and 928 Series cars.

wheel seal noise

Important Notice: Technical Bulletins are intended for use by professional technicians, not a “Do-it-yourselfer.” They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Special tools may be required to perform certain operations identified in these bulletins. Use of tools and procedures other than those recommended in these bulletins may be detrimental to the safe operation of your vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your Porsche Dealer for information on whether your vehicle may benefit from the information. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify correct part numbers.

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