Vehicle Vibration At Speeds Between 77 - 87 Km/H (48 - 54 Mph) (00-T-57A)

GENERAL DIAGNOSTIC INFORMATION

Since the powertrain damper kit is designed to correct a very specific vibration, it is important that all other possible causes of vehicle vibration be eliminated before installing the kit. Since a road test is necessary, it is important that the following checks are performed.

• Check for debris build-up on the tires and/or wheels.
• Check tires for thread distortions, separation, bulges from impact, and abnormal or excessive wear.
• Check for missing or loose wheel weights.
• Check for bent and/or damaged wheels.
• Check for missing or loose wheel weights.
• Check for loose or missing wheel lug nuts.
• Check for proper tire bead seating on rim of wheel.
• Make sure the wheel and tire assemblies are within specification for radial and lateral runout.
• Make sure the wheel and tire assemblies are correctly balanced to the nearest 0.10 oz.
• Check front suspension components for excessive wear and/or damage (Refer to Fig 1 ):
  Fig 1: Front Suspension Component Inspection Points

  
  • Check if cradle is bent.
  • Check tension strut bushings for wear or damage.
  • Check lower control arms for worn ball studs, worn bushings, or bent arms.
  • Check steering gear for wear or damage.
  • Check inner and outer tie rod ends for wear or damage.
  • Check strut assemblies for wear, binding and to make sure they are not bent.
• Check rear suspension components for excessive wear and/or damage (Refer to Fig 2 ):
  Fig 2: Rear Suspension Component Inspection Points

  
  • Check if the cross support is bent.
  • Check trailing arms to see if the bushings are worn or if the arms are bent.
  • Check lateral links to see if the bushings are worn or if the arms are bent.
  • Check stabilizer bar on vehicle so equipped for worn or missing bushings, and to verify that the stabilizer bar is not bent.

After checking the above items, road test the vehicle on a smooth road surface while very gradually accelerating the vehicle from 77 - 87 km/h (48 - 54 mph). If the vehicle is equipped with cruise control, it is convenient to use it to accelerate the vehicle at 2 km/h (1 mph) increments.

A vibration may start between 77 - 87 km/h (48 - 54 mph). It may grow more pronounced as the vehicle maintains a steady speed within the 77 - 84 km/h (48 - 54 mph) speed range on a smooth surface. Any rough areas in the road such as expansion joints or any irregularities in the road surface will interrupt the vibration, causing a need to restart the road test.

Install the powertrain damper kit under these circumstances only:

• When all other possible causes for vehicle's vibration have been eliminated.
• When a continuous vibration occurs only between 77 - 87 km/h (48 - 54 mph) and the vibration is most pronounced in the vehicle floorboards and seat cushions.
  • Install P/N 21012637 if vehicle is equipped with automatic transaxle.
  • Install P/N 21012638 if vehicle is equipped with a manual transaxle.

The powertrain damper kit comes with the damper installed to the upper bracket. The powertrain damper kit has two steel washers and two rubber grommets attached to the damper's shaft. One M8 x 20 mm bolt, one M8 nut, and one M6 nut are included in each kit. Each kit contains a lower bracket. There are two lower bracket designs, one for automatic transaxles and one for manual transaxles.

Fig 3: Powertrain Damper Kit

The powertrain damper kit installs between the left midrail and the transaxle. Utilizing the forward battery fastener(s), the upper bracket attaches to the midrail, underneath the battery tray. The lower bracket (a modified transaxle strut bracket) attaches to the transaxle at the same location as the transaxle strut bracket. The damper itself attaches to the upper bracket with an M10 x 40 mm bolt and to lower bracket with steel washers and the rubber grommets held in place with an M6 nut. See Fig 3 .

BENCH ASSEMBLY OF DAMPER-TO-LOWER BRACKET

Fig 4: Assembly of Damper to Lower Bracket

1. Remove the first rubber grommet and the first steel washer from the damper shaft.
2. Install the damper shaft into the appropriate lower bracket; install the rubber grommet and then the steel washer onto the damper shaft.
3. Install the M6 nut to the damper shaft. To tighten the nut, hold the flats on the damper shaft with a 7 mm wrench. Tighten bolts to 10 N.m (89 in lb).
4. After damper is assembled, proceed to "Damper installation on Vehicle."

DAMPER INSTALLATION ON VEHICLE

Fig 5: Removing Air Induction System

1. Remove air induction system. See Fig 5 .
   Fig 6: Removing Battery

   
2. Remove Battery. See Fig 6 .
   1. Disconnect negative battery cable.
   2. Disconnect positive battery cable.
   3. Remove battery hold down bracket fasteners and remove bracket.
   4. Lift battery out of vehicle and place in a safe location.
      Fig 7: Removing Battery Tray

      
3. Remove battery tray.
   1. Remove battery attachment bolts. (One bolt is located in fender well area.)
   2. Remove PM attachment bolts and lay PCM aside.
   3. Unclip battery cables from battery tray.
   4. Remove battery tray from vehicle.
IMPORTANT: Do not make the slot any wider than the original width of the hole. Make sure to slot the hole outboard (toward the left front tire if the battery tray was mounted in the vehicle).
4. Modify battery tray front vertical bolt hole.
   1. Place battery tray in a vice.
   2. Use a rat-tail file to elongate the front vertical bolt hole. Create an oblong slot measures 18 mm (23/32 in.) at location (1) shown in Fig 8 . (This is approximately an 8 mm [5/16 in.] increase in the size of the existing bolt hole.)
      Fig 8: Creating New Slot

      
5. Remove corner of battery tray.
   1. Refer to Fig 9 and mark location of pilot hole to be drilled.
      • Dimension (1) should be 30 mm (1 3/16 in.).
      • Dimension (2) should be 27 mm (1 1/16 in.).
        Fig 9: Removing Corner of Battery Tray

        
   2. Drill a 5 mm (3/16 in.) hole at marked location. See Fig 10 .
      Fig 10: Hole Location

      
      NOTE: It is essential to maintain a rounded corner in the cutout section of the battery tray. This rounded corner will help relieve stress at the corner and prevent the battery tray from cracking.
   3. Use a hacksaw to cut in from the bottom and the side of the battery tray to remove remainder of battery tray corner. See Fig 11 .
   Fig 11: Cutting a Round Corner

   
6. Remove transaxle strut. (Refer to "Transaxle Strut" in the Powertrain Mounts section of the 2000-2002 S-Series Chassis Service Manual.)
7. Remove the two transaxle strut bracket fasteners and remove the transaxle strut bracket.
   Fig 12: Automatic Transaxle

   
8. Install bench-assembled damper kit by securing it in place with the two transaxle strut bracket fasteners. Tighten bolts to 54 N.m (40 lb ft).
   Fig 13: Attaching Manual Transaxle Strut Bracket

   
9. Finger start forward vertical battery tray bolt through the damper kit's upper bracket. Tighten loosely to secure bracket location while making sure that the horizontal hole in the upper bracket aligns with its mating hole in the midrail.
   Fig 14: Damper Kit Upper Bracket

   
10. Raise vehicle on a hoist.
11. Remove left front wheel and tire assembly.
IMPORTANT: The hole created in the next two steps will be used to gain access to the inside of the frame rail for installation of the M8 x 20 mm bolt.
12. Refer to Fig 15 and locate the forward hole in frame rail that was used in first design vehicles to secure battery tray to the frame rail.
    Fig 15: Forward Hole in Frame

    
    Fig 16: Metric SAE Dimension Stepped Uni-bit

    
13. Using a metric SAE dimension stepped uni-bit, enlarge hole to 17 mm (11/16 in.). See Fig 16 .
    Fig 17: Installing M8 x 20 mm Bolt Using Extension

    
14. To install M8 x 20 mm bolt, use an extension and a 10 mm socket. Use a magnetic socket or secure the bolt in the socket with RTV. See Fig 17 .
    Fig 18: Installing Bolt

    
15. Slide bolt, socket and extension through 17 mm or 11/16 in. hole created in a previous step. Slide the bolt through the opposite hole in the inside of the midrail and through the hole in the damper kit's upper bracket. See Fig 14 .
16. Install M8 nut onto bolt and tighten. Tighten bolt to 30 N.m (22 ft lb).
17. Using 3M WINDO-WELD Primer (Black) (P/N 08643) or equivalent, prime edge of 17 mm, or 11/16 in. hole enlarged in outside of midrail. See Fig 19 .
    Fig 19: Using 3M Window Weld

    
18. Install Wheel and tire assembly. Tighten bolts to 40 N.m (103 ft lb).
19. Lower vehicle from hoist.
20. Install transaxle strut to the new modified transaxle strut bracket. Tighten bolts to 70 N.m (52 lb ft).
21. Install battery tray and loosely install all three battery tray bolts starting with horizontal bolt. See Fig 20 .
    Fig 20: Installing Battery Tray

    
22. Torque front vertical battery tray bolt. Tighten bolt to 20 N.m (15 ft lb).
23. Torque rear vertical battery tray bolt. Tighten bolt to 10 N.m (89 lb in).
24. Torque horizontal battery tray bolt. Tighten bolt to 10 N.m (89 in lb).
25. Position PCM to battery tray and install bolts. Tighten bolt to 6 N.m (53 in lb)
    IMPORTANT: The damper-to-upper bracket bolt is properly torqued.
26. Verify damper-to-upper bracket bolt is properly torqued. Tighten bolt to 70 N.m (52 lb ft).
27. Install transaxle strut-to-frame rail bolt. Tighten bolt to 70 N.m (52 lb ft).
28. Install battery.
    1. Make sure that the battery is in good physical condition (e.g., no cracks, or obvious damage).
    2. Make sure that battery terminals are clean.
    3. Make sure the battery cable ends are clean.
    4. Install battery carefully in the battery tray; make sure that the terminals do not short against any metal during the installation.
    5. Install battery hold down bracket. Tighten bolts to 9 N.m (80 in lbs).
    6. Connect positive battery cable. Tighten bolt to 17 N.m (13 lb ft).
IMPORTANT: It may be necessary to use a 2 mm thick shim between the forward mounting foot on air cleaner assembly and frame rail.
29. Install air induction system.
30. Road test vehicle to verify that vibration has been corrected.