|
Here is the answer to the issue......
SI B36 01 13
Wheels and Tires February 2013
Technical Service
SUBJECT
Steering Wheel Vibration at Speeds of 42-55mph
MODEL
F30
SITUATION
The customer complains of vibration at speeds between 42-55 mph.
CAUSE
Wheel/tire combination
Drive flange/wheel bearing
Alloy wheel to wheel hub clearance out of tolerance
Tension strut hydro-mount leaking
CORRECTION
Before starting the procedure, the complete wheel/tire must be checked for correct tire pressure and damage.
The hydro-mount of the tension strut must be inspected for leaks.
The vehicle should be road-tested to verify the customer complaint and severity of the vibration.
Check the wheel centering of the light-alloy rim on the wheel hub. To do so, clean the contact surfaces of the wheel hubs and the light-alloy rims, and only slightly tighten the wheels.
Using a feeler gauge at the bottom position, determine the maximum play. Play of 0.1 mm is still within the permissible tolerance. Play of 0.15 mm or greater is outside the permissible tolerance.
Document the clearance check at each wheel.
If there are tolerance variations, the affected components (wheel bearing/drive flange) must be measured individually.
Nominal values for wheel bearing/drive flange: 72.47 mm-72.50 mm (caliper gauge measuring equipment)
If the tolerance is too great, the wheel bearing/drive flange must be replaced.
If the tolerance is too great and the wheel bearing/drive flange is within tolerance, the corresponding rim(s) must be replaced.
If all affected components are within specification, check the wheel balance.
Note: Warm the tires before balancing, and then test the wheels directly on the balancing machine.
Before any adjustments, document: tire pressures, total amount of weights on each wheel, and results of the road test.
Using the tire balancing machine, Hunter GSP 97 BMW:
Measure all complete wheels with regard to RFF (radial force fluctuation).
If necessary, match target values (mark the low point of the rim by measuring the rim without the tire).
Check the rim on the balancing machine; max. radial run-out. Refer to the notes in RA 3610715.
Align the match point of the tire with the low point of the rim and balance, including load force.
From the balance and load force screen, press the up/down arrow button once: K4 Show Runout and force matching/K4 Show details.
Target values:
Radial 1st Harmonic less than 17lbs
Radial T.I.R. less than 26lbs
If the target values cannot be achieved, submit a PuMA case with the subject “F30 Vibration Between 42-55 mph.”
Provide all the measured data:
Clearance check at each wheel
Tire size
Tire manufacturer
DOT
Rim styling
Rim manufacturer (on the back)
Max. radial run-out
Values of the road force Hunter measurement
If all affected components are within specification, continue.
After wheel balancing and installing the wheels with the lowest road force measurement to the front of the vehicle, perform a vehicle road test. Document the results of the road test.
If no vibration is found, the vehicle can be released.
For vehicles with the N20 engine without SA 2VL (Sport Steering) where all wheels are OK and the procedure does not improve the situation, submit a PuMA case with the subject “F30 Vibration Between 42-55 mph.”
WARRANTY INFORMATION
If performing the diagnostics outlined in this Service Information bulletin and/or the PuMA case recommendations results with eligible and covered work, claim this work with the applicable defect code(s) and labor operations listed in KSD2.
Wheel balancing as a stand-alone repair is covered under the New Vehicle/SAV Limited Warranty, up to the first 2,000 miles.
Wheel balancing that is a “consequential” repair procedure to perform a covered repair is covered.
Note: Please follow any TeileClearing (TC) or Diagcode (DC) requirements that may apply to this additional work.
[ Copyright © 2013 BMW of North America, LLC ]
|