03-00-91-001F

File in Section:
Service Bulletin
00 - General Information
Bulletin No.:
03-00-91-001F
Date:
February, 2013
INFORMATION
Subject:
Vibration Analysis Worksheet
Models:
2014 and Prior GM Passenger Cars and Trucks
This bulletin is being revised to add models years and to change the location of the EVA
readings requested. Please discard Corporate Bulletin Number 03-00-91-001E
(Section 00 – General Information).
When diagnosing vibration concerns, use the following
worksheet in conjunction with the appropriate Vibration
Analysis-Road testing procedure in the Vibration
Correction sub-section in SI. FILL OUT ONLY THE
APPLICABLE PORTION OF THE WORKSHEET THAT
APPLIES TO THE VIBRATION / NOISE.
Refer to the appropriate section of SI for specifications
and repair procedures that are related to the vibration
concern.
GM 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. 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 GM dealer for information on whether your vehicle may benefit from the
information.
Copyright 2013 General Motors LLC. All Rights Reserved.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION
Page 2
February, 2013
Bulletin No.: 03-00-91-001F
Vibration Analysis Worksheet
To:
Dealer:
Fax Number:
VIN__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __
Procedure Performed By:
Date:
Model:
Year: Gear Ratio:
Odometer:
VIN __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __
TAC Case #, if applicable:
Conditions During Road Test Procedures
As condition occurs: Engine RPM_____________
Vehicle Speed__________________
Vibration/Noise detected during the following road test procedures:
Engine RPM_______________ Vehicle Speed_______________
Slow Acceleration Test: Yes__________ No__________
Neutral Coast-Down Test: Yes__________ No__________
Downshift Test: Yes__________ No__________
Neutral Run-Up Test: Yes__________ No__________
Brake Torque Test: Yes__________ No__________
Steering Input Test: Yes__________ No__________
Standing Start Acceleration (Launch Shudder) Test: Yes__________ No__________
Vibration/Noise Eliminated with TCC Commanded On: Yes__________ No__________
Vibration/Noise Eliminated with TCC Commanded Off: Yes__________ No__________
Vibration/Noise Duplicated on Hoist: Yes__________ No__________
When using the EVA, always take a snapshot. This will help determine which vibration shows up the most.
Important: Vibrate software can also be used to assist in vibration diagnosis. Refer to Vibrate Software Description and
Operation in SI.
EVA Readings
Refer to Electronic Vibration Analyzer (EVA) Description and Operation in SI for more detailed information.
Important: As a reminder, place the EVA sensor where the vibration is felt by the customer or on the test drive ie: if the vibration
complaint is from the seat then place the sensor on the seat track, if the vibration complaint is from the steering wheel then attach
the sensor to the steering column. Ensure the word “UP” on the sensor is physically facing up. The typical areas are the seat
track, the steering column or the instrument panel. Locating the EVA sensor on additional area (i.e. the right fender, left fender,
right quarter panel, left quarter panel, rear seat track, etc.) may also assist in determining the component causing the vibration/
noise. The key is to look for the same Hz reading with the greatest amplitude G readings.
Bulletin No.: 03-00-91-001F
February, 2013
Page 3
Vibration Analysis Worksheet
FILL OUT ONLY THE APPLICABLE PORTION OF THE WORKSHEET THAT APPLIES TO THE VIBRATION/NOISE:
Sensor at Steering Column:
1st Line MPH/KPH:__________ HZ:__________ Gs:__________
2nd Line MPH/KPH:__________ HZ:__________ Gs:__________
Sensor at Drivers Seat Rail:
1st Line MPH/KPH:__________ HZ:__________ Gs:__________
2nd Line MPH/KPH:__________ HZ:__________ Gs:__________
Sensor at Passenger Seat Rail:
1st Line MPH/KPH:__________ HZ:__________ Gs:__________
2nd Line MPH/KPH:__________ HZ:__________ Gs:__________
Driveshaft Runout:
Is runout within specification? Yes__________ No__________
Initial: Frt:__________ Center:__________ Rear:__________ Stub Shaft:__________
Current: Frt:__________ Center:__________ Rear:__________ Stub Shaft:__________
Pinion Flange Runout Reading:__________
Has a system balance been attempted: Yes__________ No__________ (If no, perform a System Balance)
Were the drums removed to system balance? Yes__________ No__________
Initial: HZ__________ Gs__________
Current: HZ__________ Gs__________
Hose clamps added: Yes__________ No__________
Prop shaft indexed? Yes__________ No__________
If a System Balance has been attempted but the vibration is still present or system balance was not able to be achieved, check
the ring gear backlash in eight different spots on the ring gear. Note that excessive ring gear runout may result in a first order tire
speed or first order prop shaft speed concern.
Backlash in eight equal spots on the ring gear (readings should not vary more than 0.002 in (0.050 mm)):
1__________ 2__________ 3__________ 4__________ 5__________ 6__________ 7__________ 8__________
Does the vehicle have any of the following components attached?
Pinion damper: Yes__________ No__________
Pinion flange damper: Yes__________ No__________
Exhaust damper: Yes__________ No__________
Initial: Front angle:__________ Center Angle:__________ Rear Angle:__________
Current: Front angle:__________ Center Angle:__________ Rear Angle:__________
Were shims added to the following?
Transmission/transfer case mount: Yes__________ No__________
Pinion nose (rear springs): Yes__________ No__________
Center Support Mount: Yes__________ No__________
Tire Size and Brand:_____________________________________
Record wheel balance information below if available record weight information prior to balance and after balance.
Wheel/Tire balance
Right rear: Inner Weight:__________ Outer Weight:__________
Left rear: Inner Weight:__________ Outer Weight:__________
Right front: Inner Weight:__________ Outer Weight:__________
Left front: Inner Weight:__________ Outer Weight:__________
Wheel/Tire Runouts on vehicle (max. 0.050 in (1.27 mm))
Refer to the latest version of Corporate Bulletin Number 00-03-10-006 for tire radial force variation information.
Right rear: Inner lateral:__________ Center radial:__________
Left rear: Inner lateral:__________ Center radial:__________
Right front: Inner lateral:__________ Center radial:__________
Left front: Inner lateral:__________ Center radial:__________
Page 4
February, 2013
Vibration Analysis Worksheet
Mounting surface runouts (max. 0.005 in (0.127 mm))
Flange, right rear:__________ Hub, right front:__________
Flange, left rear:__________ Hub, left front:__________
Wheel stud runouts (max. 0.008 in (0.203 mm))
Flange, right rear:__________ Hub, right front:__________
Flange, left rear:__________ Hub, left front:__________
Bulletin No.: 03-00-91-001F