Inspection Of Hub Rotation Starting Torque And Wheel Bearing Looseness

Required Special Tools: 

• MB990998: Front hub remover and installer
• MB991000: Spacer
• MB990326: Preload socket
• MB990685: Torque wrench

1. Install the following special tools to the hub and tighten to the specified torque.
   • Front hub remover and installer (MB990998)
   • Spacer (MB991000)

     Tightening torque: 270 ± 27 N.m (199 ± 19 ft-lb) 

2. Fix the hub in a vice using a piece of wood or the like.
3. Rotate the hub to make the bearing well-greased.
   Fig 1: Identifying Special Tool (MB990998) And (MB991000)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. Use the following special tools to measure the hub rotation starting torque.
   • Preload socket (MB990326)
   • Torque wrench (MB990685)

     Limit: 1.4 N.m (12.4 in-lb) 

5. If the hub rotation starting torque at the specified tightening torque (270 ± 27 N.m [199 ± 19 ft-lb]) exceeds the limit, replace the hub. If there are rough or gritty feelings in rotation, replace the hub.
   Fig 2: Measuring Hub Rotation Starting Torque

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. Set a dial gauge, and move the hub in the axial direction to measure the looseness in the wheel bearing.

   Limit: 0.05 mm (0.002 inch) 

7. If the wheel bearing looseness at the specified tightening torque (270 ± 27 N.m [199 ± 19 ft-lb]) exceeds the limit, replace the hub.
   Fig 3: Measuring Looseness In Wheel Bearing

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.