Fulltext TSBs

Technical Service Bulletins

TSB
04-25-7
  • VEHICLE/STEERING WHEEL VIBRATION AT 50 MPH (80 KM/H) OR HIGHER – STEERING WHEEL NIBBLE AT 65 MPH (105 KM/H) OR HIGHER
Publication Date: December 8, 2004

FORD:
2004-2005 F-150

ISSUE:

Some F-150 vehicles may exhibit a vehicle/steering wheel vibration (not nibble) at 50 MPH (80 km/h) or higher, or a steering wheel nibble (side-to-side or rotational oscillation) at 65 MPH (105 km/h) or higher.

ACTION:

Refer to the Diagnostic Overview (Figure 1). Based on the customer’s description of the concern, find the appropriate Operating Condition, Probable Cause and Repair Action.

NOTE:IT IS CRITICAL TO IDENTIFY SPECIFIC VEHICLE SPEEDS AND OPERATING CONDITIONS WHEN THE VIBRATION OR NIBBLE IS OCCURRING, TO PROPERLY DIAGNOSE AND REPAIR THE ISSUE. TIRE AND DRIVELINE VIBRATION CAN FEEL SIMILAR. USE OF AN ELECTRONIC VIBRATION ANALYZER (EVA) OR VETRONIX VIBRATION ANALYZER IS RECOMMENDED TO CORRECTLY IDENTIFY VIBRATION SOURCES (ORDERS) AND FREQUENCY (HZ).

NOTE:NIBBLE CANNOT BE ELIMINATED WITHOUT ADDRESSING PROPER TIRE AND WHEEL BALANCE.




Figure 1 – Article 04-25-7

SERVICE PROCEDURE

  1. Drive the vehicle at highway speeds for at least 20 miles to eliminate flat spotting. Install an EVA or Vetronix vibration analyzer and have an assistant monitor and record the reading near the end of the 20 mile drive and while at the peak of the vibration. Proceed to Step 2 for 4×4 vehicles and directly to Step 3 for 4×2 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 DRIVE, THE CONCERN IS DUE TO TIRE FLAT SPOTTING WHICH IS A NORMAL TIRE CONDITION. NO FURTHER DIAGNOSIS OR REPAIRS SHOULD BE PERFORMED.

  2. Check the Integrated Wheel End (IWE) on 4×4 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 Section 308-07 to repair IWE first. Then proceed to Step 3.
  3. If road force measurement equipment (Hunter GSP9700/9712, or equivalent) is available, proceed to Step 4. If not, balance the tires with a standard balancer and use a dial indicator to locate and mark the high point of each the tire’s centerline radial run out (to use in place of R1H in the following steps). After marking the tires, proceed to Step 7.

    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.

  4. 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 then proceed to Step 5. If less than the values listed, proceed to Step 6.

    Tire TypeR1H
    P Metric Tires25 lbs.
    LT Tires25 lbs.

  5. Using the road force measurement equipment, determine the low spot of the wheel run out. Match high point force variation on the tire with the low spot of wheel run out. If the wheel assembly is now acceptable, continue with rebalance. If not, replace the tire and re-check.

    NOTE:THE SPARE TIRE SHOULD NOT BE USED AS A REPLACEMENT TIRE.

  6. Install the lowest R1H level tires on the front of the vehicle.
  7. Position all tire/wheel assemblies on the hubs with the high R1H point, or high tire centerline radial run out point, at the 12:00 position (Figure 2).


    Figure 2 – Article 04-25-7

  8. Install the lug nuts and torque to 150 lb-ft (200 N-m).
  9. Using a flat feeler gauge, check the wheel hub-to-bore clearance to verify the largest gap is as close to the 6:00 position as possible (Figure 2). If the largest gap is not located near the 6:00 position remove the lug nuts and tire/wheel assembly, rotate the hub to a new position, and reinstall the tire wheel assembly again following steps 7 and 8. Check again for the optimum 6:00 gap location. Road test vehicle to verify vehicle is corrected. If not corrected, proceed to step 10.
  10. Perform the following based on remaining symptom:
    1. If vibration still exists at 50-65 MPH (9-11 Hz), condition may be due to vehicle sensitivity or road inputs. Obtain Frame Damper Kit and refer to the instruction sheet included in the kit for installation.

      NOTE:THE DAMPER KIT WILL NOT HELP A STEERING WHEEL NIBBLE CONDITION OR A DRIVELINE VIBRATION (25-45 HZ).

    2. If steering wheel nibble still exists at 65 MPH or higher (12-14 Hz), and the vehicle build date is prior to 8/20/2003, follow TSB 03-20-8 to determine if steering gear replacement is needed.

PART NUMBERPART NAME
4L3Z-5D008-AAFrame Damper Kit

OTHER APPLICABLE ARTICLES:

04-25-08,  03-20-08

WARRANTY STATUS:

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage

OPERATIONDESCRIPTIONTIME
042507ARoad Test 20 Miles With NVH Tool, Recorded Frequency (Two Man Allowance) If Concern Is Solved, Return Vehicle To Customer1.6 Hrs.
042507BRoad Test 20 Miles With NVH Tool, Recorded Frequency (Two Man Allowance), Inspect IWE, Balance 4 Tires, Measure Hubs, Re-Road Test2.8 Hrs.
042507CRoad Test 20 Miles With NVH Tool, Recorded Frequency (Two Man Allowance), Inspect IWE, Balance 4 Tires, Measure All Hubs, Re-Road Test, Install Damper3.4 Hrs.
042507DRoad Test 20 Miles With NVH Tool, Recorded Frequency ( Two Man Allowance), Inspect IWE, Balance 4 Tires, Re-Index 4 Tires, Measure All Hubs, Re-Road Test3.4 Hrs.
042507ERoad Test 20 Miles With NVH Tool, Recorded Frequency (Two Man Allowance), Inspect IWE, Balance 4 Tires, Re-Index 4 Tires, Measure All Hubs, Re-Road Test, Install Damper4.0 Hrs.
042507FRoad Test 20 Miles With NVH Tool, Recorded Frequency (Two Man Allowance), Inspect IWE, Balance Tires, Re-Index 4 Tires, Re-Balance 4 Tires, Replace 4 Tires, Balance 4 New Tires, Measure All Hubs, Re-Road Test4.3 Hrs.
042507GRoad Test 20 Miles With NVH Tool, Recorded Frequency (Two Man Allowance), Inspect IWE, Balance 4 Tires, Re-Index 4 Tires, Re-Balance 4 Tires, Replace 4 Tires, Balance 4 New Tires, Measure All Hubs, Re-Road Test, Install Damper4.6 Hrs.

DEALER CODING

BASIC PART NO.CONDITION CODE
TWC01 (Operation A, B, D, F, G) or 5005 (Operation C, E)42