Drivetrain - Vibration
70/O2/96/US12/31/96
SUBJECT
PRIDE - Drivetrain Vibration
MODEL AFFECTED VEHICLES
Range Rover 4.0/4.6 LP up to VA346794
LH
LJ
LD
DETAIL
Refer to TIB 47/01/97/US, Driveline Vibration Diagnosis and Remedy, for vibration troubleshooting methodology to be used for Range Rover. An updated version of the TIB is to be issued which will include Range Rover.
A specific drivetrain vibration noticeable at 113-129 kph (7O-80 mph) has been identified on Range Rover. Investigation has determined that a specific dimension on some transmission brake drums may not be within specification and can result in imprecise location of the rear drive shaft with consequent drive shaft vibration. The procedure below has been developed to identify parts which may be out of specification and should be used on customer complaint of driveline vibration. The procedure is to be used in conjunction with the vibration diagnostic procedure described in TIB 47/01/97/US.
The diagnostic steps and repair procedures detailed on the following pages were developed as an element of the Land Rover Way OPERATION PRIDE. This TIB provides a library location for PRIDE information within the Land Rover North America technical literature system.
ACTION REQUIRED
Upon customer complaint for the symptoms outlined, perform the specified repairs.
PARTS INFORMATION
NTC9859 - Brake Drum
WARRANTY
Normal warranty procedures and policies apply.
COMP. CODE
SRO
70.45.89/27 - Time: 0.3 hr
Measure drum/flange run-out
70.45.17 - Time 0.65 hr.
Replace brake drum
PROCEDURE
Perform the diagnostic procedures and repairs outlined below for the repair of Drivetrain Vibration.
1. Drive the vehicle onto a ramp, release the park brake, and place the gear selector in neutral.
2. Using wheel free jacks under the front axle (lowest point of radius arm) and the rear axle (composite link mounts), lift the vehicle until all 4 wheels are free to rotate.
3. Measure the radial run-out of the rear driveshaft flange (transfer box end) as follows:
^ Ensure the flange surface is clean by removing any underseal deposits.
^ Secure a Dial Test Indicator (DTI) with a magnetic base to the chassis rails and position the measuring tip on the outer diameter of the driveshaft flange (figure 1 ).
^ Hold one rear wheel stationary and rotate the other wheel one complete rotation of the driveshaft. The DTI should indicate a run-out not exceeding 0.13 mm. (0.005 in.).
4. Measure radial run-out of transmission brake drum as follows:
^ Ensure the drum surface is clean by removing any underseal deposits.
^ Secure DTI to the chassis rails and position the measuring tip on the outer diameter the brake drum (figure 2).
^ Hold one rear wheel stationary and rotate the other wheel one complete rotation of the drum. The DTI should indicate a run-out not exceeding 0.15 mm. (0.006 in.).
5. If measurements from steps 3 or 4 exceed the given specification, loosen the driveshaft bolts and measure the relative movement between the driveshaft flange and the brake drum as follows.
^ Secure the DTI to the flat face of the drum (figure 3)
^ Position the measuring tip on the outer diameter of the driveshaft flange.
^ Move the driveshaft up/down and left/right relative to the drum while keeping the flange in contact with the drum.
^ Do not rock the flange. The DTI reading should not exceed 0.13 mm. (0.005 in.).
6. If the measurement in step 5 exceeds the given specification, the brake drum must be replaced (NTC9859). Repeat steps 3 through 5 when the new drum has been installed to validate that the problem has been resolved.
7. Remove the DTI.
8. Torque the driveshaft mounting bolts to 54 Nm. (40 lbf. ft.).
9. Lower the vehicle.
10. Road test the vehicle to validate that the customer complaint is resolved