Technical Service Bulletins
|Publication Date: May 31, 2006|
This article supersedes TSB 03-20-8 to update the Service Procedure and Parts Numbers.
Some F-150 vehicles built prior to 8/20/2003 (excluding F-150 Heritage), may exhibit a steering wheel shimmy / nibble at 60 MPH (100 Km/h) and greater speeds. The condition is felt in the steering wheel as a side-to-side, or rotational, oscillation. When measured (sensor on steering wheel) with an Electronic Vibration Analyzer (EVA), the measured frequency is between 12-16 Hz.
Follow the Service Procedure steps to correct the condition.
|NOTE:||BEFORE BEGINNING THIS PROCEDURE, ENSURE THAT THE TIRES DO NOT HAVE FLAT SPOTS. IT MAY BE NECESSARY TO DRIVE THE VEHICLE FOR UP TO 20 MILES (32 KM)TO ELIMINATE THIS CONDITION.|
- Proceed to Step 2 for 4X4 vehicles and directly to Step 3 for 4X2 vehicles.
NOTE: IF NOT DRIVEN TO REMOVE FLAT SPOTS, THE TIRE BALANCE AND ROAD FORCE MEASUREMENTS MAY BE INACCURATE. NOTE: IF THE VIBRATION GOES AWAY DURING THE 20 MILE (32 KM) DRIVE, THE CONCERN IS DUE TO TIRE FLAT SPOTTING WHICH IS A NORMAL TIRE CONDITION. NO FURTHER DIAGNOSIS OR REPAIRS SHOULD BE PERFORMED.
- Check the integrated wheel end (IWE) on 4X4 units. Raise the front of the vehicle (wheels off the ground), engine running, and vehicle in 2WD mode. The front half shafts should not turn when wheels are rotated by hand. If the IWE is functioning correctly proceed to Step 3. If not, refer to Workshop Manual (WSM), Section 308-07 to repair IWE first. Then proceed to Step 3.
- If road force measurement equipment (Hunter GSP9700/9712, or equivalent) is available, proceed to Step 4. If not, check wheel balance, and rebalance as required to achieve less than 0.35 oz. (10g) of imbalance. Refer to TSB 05-26-24 for tire / wheel run-out diagnostics. After optimizing tire / wheel run-out, test drive the vehicle. If the concern is corrected, return the vehicle to the customer. If not, proceed to Step 5.
NOTE: THE PROCEDURE IN THIS TSB IS FAR MORE EFFECTIVE WHEN USING ROAD FORCE MEASUREMENT EQUIPMENT. ONLY USE A STANDARD BALANCER AND MANUALLY CHECK RUN OUT WHEN ABSOLUTELY NECESSARY. THERE IS A WEBSITE AVAILABLE (WWW.GSP9700.COM) TO LOCATE THE NEAREST FACILITY THAT HAS THIS TYPE OF EQUIPMENT. NOTE: SUPPRESS ROUND OFF FUNCTION ON ROAD FORCE BALANCER TO ALLOW ACTUAL RESIDUALS TO BE DISPLAYED.
- Perform the road force measurement immediately after driving the vehicle. Remove the wheel cover and wheel assembly. Measure the road force variation of all four tires. Measure and mark the tire HIGH road force variation point (R1H) on all four tires prior to dismounting them from the road force measurement equipment. Balance as required to 0.35 oz. (10g) or less of imbalance (check both two-plane and static). If any wheel assembly measures more than the values listed in the chart below for R1H, refer to TSB 05-26-24 for tire / wheel run-out diagnostics. If a tire / wheel assembly can not be brought within the R1H values listed in the chart using TSB 05-26-24, replace the tire and re-check. If less than the values listed, test drive the vehicle. If the concern is corrected, return the vehicle to the customer. If not, proceed to Step 5.
Tire Type R1H P Metric Tires 25 lbs. LT Tires 35 lbs.
- Replace Steering Gear. Refer to the part application chart below.
NOTE: DO NOT REPLACE THE STEERING GEAR IF LATEST LEVEL IS ALREADY INSTALLED. THE LATEST LEVEL CAN BE IDENTIFIED BY A GREEN PAINT DOT ON THE BAR CODE LABEL LOCATED NEAR THE RIGHT SIDE BUSHING BRACKET, AND / OR BY THE FIRST 5 DIGITS OF THE SERIAL NUMBER ON THE BAR CODE LABEL. IF THE FIRST 5 DIGITS OF THE SERIAL NUMBER ARE GREATER THAN: 21003 ALL CREW CAB AND SUPER CAB EXCEPT 133″ WHEEL BASE, OR 21603 ALL REGULAR CAB AND SUPER CAB WITH 133″ WHEEL BASE, THE STEERING GEAR IS THE LATEST LEVEL.
|PART NUMBER||PART NAME|
|6L3Z-3504-AA||Steering Gear (Supercab and Supercrew 4X2)|
|6L3Z-3504-BA||Steering Gear (Supercab and Supercrew 4X4)|
|6L3Z-3504-CA||Steering Gear (Regular Cab 4X2)|
|6L3Z-3504-DA||Steering Gear (Regular Cab 4X4)|
OTHER APPLICABLE ARTICLES:
|BASIC PART NO.||CONDITION CODE|
NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by “do-it-yourselfers”. Do not assume that a condition described affects your car or truck. Contact a Ford, Lincoln, or Mercury dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article. The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supercede this information with updates. The most recent information is available through Ford Motor Company’s on-line technical resources.
Copyright © 2006 Ford Motor Company