Main Shaft Assembly for Single-Range: Inspection

Disassembled parts should be washed clean first with cleaning solvent and then inspected carefully.

1. Bearing

   Replace the bearings in the following cases.

   • When the bearing balls, outer races and inner races are broken or rusty.
   • When the bearing is worn.
   • When the bearings fail to turn smoothly or emit noise in rotation after gear oil lubrication.
   • When bearing has other defects.
2. Bushing (each gear)

   Replace the bushing in following cases.

   • When the sliding surface is damaged or abnormally worn.
   • When the inner wall is abnormally worn.
3. Gear

   Replace gears in the following cases.

   • Replace gear with new part if its tooth surfaces are broken, damaged or excessively worn.
   • Correct or replace if the cone that contacts the baulk ring is rough or damaged.
   • Repair or replace if the inner surface or end face is damaged.
4. Baulk ring

   Replace the baulk rings in the following cases.

   • When the inner surface and end face are damaged.
   • When the ring inner surface is abnormally or partially worn down.
   • When the contact surface of synchronizer ring insert is cracked or abnormally worn.
   • If the gap between the end faces of the ring and the gear splined part is excessively small, check the clearance (A) while pressing the ring against the cone.

   Clearance (A): 

   0.5 mm (0.020 in) or more 

   Fig 1: Clearance Between End Faces Of Ring And Gear Splined

   Courtesy of SUBARU OF AMERICA, INC.
5. Shifting insert key

   Replace the insert key if deformed, excessively worn or defective in any way.

6. Oil seal

   Replace the oil seal if the lip is deformed, hardened, worn or defective in any way.

7. O-ring

   Replace the O-ring if the sealing face is deformed, hardened, damaged, worn or defective in any way.

8. Gearshift mechanism

   Repair or replace the gearshift mechanism if excessively worn, bent or defective in any way.