2010 Cadillac CTS Sedan AWD V6-3.6L Technical Service Bulletin # 06-03-10-010A Date: 100609
Wheels - Changing Procedures/Precautions
INFORMATION
Bulletin No.: 06-03-10-010A
Date: June 09, 2010
Subject: Information on Proper Wheel Changing Procedures and Cautions
Models:
2011 and Prior GM Passenger Cars and Trucks
2010 and Prior HUMMER Models
2005-2009 Saab 9-7X
2005-2009 Saturn Vehicles
Attention:
Complete wheel changing instructions for each vehicle line can be found under Tire and Wheel Removal and Installation in Service Information
(SI). This bulletin is intended to quickly review and reinforce simple but vital procedures to reduce the possibility of achieving low torque during
wheel installation. Always refer to SI for wheel lug nut torque specifications and complete jacking instructions for safe wheel changing.
Supercede:
This bulletin is being revised to include the 2011 model year and update the available special tool list. Please discard Corporate Bulletin Number
06-03-10-010 (Section 03 - Suspension).
Frequency of Wheel Changes - Marketplace Driven
Just a few years ago, the increasing longevity of tires along with greater resistance to punctures had greatly reduced the number of times wheels
were removed to basically required tire rotation intervals. Today with the booming business in accessory wheels/special application tires (such as
winter tires), consumers are having tire/wheel assemblies removed - replaced - or installed more than ever. With this increased activity, it opens up
more of a chance for error on the part of the technician. This bulletin will review a few of the common concerns and mistakes to make yourself
aware of.
Proper Servicing Starts With the Right Tools
The following tools have been made available to assist in proper wheel and tire removal and installation.
- J 41013 Rotor Resurfacing Kit (or equivalent)
- J 42450-A Wheel Hub Resurfacing Kit (or equivalent)
Corroded Surfaces
One area of concern is corrosion on the mating surfaces of the wheel to the hub on the vehicle. Excessive corrosion, dirt, rust or debris built up on
these surfaces can mimic a properly tightened wheel in the service stall. Once the vehicle is driven, the debris may loosen, grind up or be washed
away from water splash. This action may result in clearance at the mating surface of the wheel and an under-torqued condition.
Caution
Before installing a wheel, remove any buildup on the wheel mounting surface and brake drum or brake disc mounting surface. Installing wheels
with poor metal-to-metal contact at the mounting surfaces can cause wheel nuts to loosen. This may cause a wheel to come off when the vehicle is
moving, possibly resulting in a loss of control or personal injury.
Whenever you remove the tire/wheel assemblies, you must inspect the mating surfaces. If corrosion is found, you should remove the debris with a
die grinder equipped with a fine sanding pad, wire brush or cleaning disc. Just remove enough material to assure a clean, smooth mating surface.
The J 41013 (or equivalent) can be used to clean the following surfaces:
- The hub mounting surface
- The brake rotor mounting surface
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- The wheel mounting surface
Use the J 42450-A (or equivalent) to clean around the base of the studs and the hub.
Lubricants, Grease and Fluids
Some customers may use penetrating oils, grease or other lubricants on wheel studs to aid in removal or installation. Always use a suitable
cleaner/solvent to remove these lubricants prior to installing the wheel and tire assemblies. Lubricants left on the wheel studs may cause improper
readings of wheel nut torque. Always install wheels to clean, dry wheel studs ONLY.
Notice
Lubricants left on the wheel studs or vertical mounting surfaces between the wheel and the rotor or drum may cause the wheel to work itself loose
after the vehicle is driven. Always install wheels to clean, dry wheel studs and surfaces ONLY.
Beginning with 2011 model year vehicles, put a light coating of grease, GM P/N 1051344 (in Canada, P/N 9930370), on the inner surface of the
wheel pilot hole to prevent wheel seizure to the axle or bearing hub.
Wheel Stud and Lug Nut Damage
Always inspect the wheel studs and lug nuts for signs of damage from crossthreading or abuse. You should never have to force wheel nuts down
the stud. Lug nuts that are damaged may not retain properly, yet give the impression of fully tightening. Always inspect and replace any component
suspected of damage.
Tip
Always start wheel nuts by hand! Be certain that all wheel nut threads have been engaged BEFORE tightening the nut.
Important
If the vehicle has directional tread tires, verify the directional arrow on the outboard side of the tire is pointing in the direction of forward
rotation.
Wheel Nut Tightening and Torque
Improper wheel nut tightening can lead to brake pulsation and rotor damage. In order to avoid additional brake repairs, evenly tighten the wheel
nuts to the proper torque specification as shown for each vehicle in SI. Always observe the proper wheel nut tightening sequence as shown below in
order to avoid trapping the wheel on the wheel stud threads or clamping the wheel slightly off center resulting in vibration.
The Most Important Service You Provide
While the above information is well known, and wheel removal so common, technicians run the risk of becoming complacent on this very
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important service operation. A simple distraction or time constraint that rushes the job may result in personal injury if the greatest of care is not
exercised. Make it a habit to double check your work and to always side with caution when installing wheels.
