Vibration Analysis Worksheet (03-00-91-001I)
Publication date: 2013-02-19Reference number: 03-00-91-001I
Supersedes refnos: 03-00-91-001, 03-00-91-001A, 03-00-91-001B, 03-00-91-001C, 03-00-91-001D, 03-00-91-001E, 03-00-91-001F, 03-00-91-001G, 03-00-91-001H
VIBRATION ANALYSIS WORKSHEET
TECHNICAL SERVICE BULLETIN
Reference Number(s): 03-00-91-001F, Date of Issue:
February 13, 2013
| AFFECTED MODEL(S): | 2014 and Prior GM Passenger Cars and Trucks |
| SUPERCEDES: | 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). |
SERVICE 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.
VIBRATION ANALYSIS WORKSHEET
| 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. 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:__________ 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:__________ |
|