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Home › Nissan-Datsun › 2004 › Sentra SE-R › Repair and Diagnosis › External Pages › Different car › Section 1867 (Manual Transmission) › Transmission Assembly › Disassembly and Assembly › Disassembly › Gear Components

Gear Components

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove rear extension (or OD gear case) and transmission case. Refer to "CASE COMPONENTS ".
  2. Remove shift forks and fork rods. Refer to "SHIFT CONTROL COMPONENTS ".
  3. Before disassembling, measure the end play for each position. If the end play is outside the standards, disassemble and inspect.
    • Main drive gear

      End play: 0 - 0.10 mm (0 - 0.004 in) 

      Fig 1: Measuring Main Drive Gear End Play
      G04203504Courtesy of NISSAN MOTOR CO., U.S.A.
    • Mainshaft (Rear side)

      End play: 0 - 0.10 mm (0 - 0.004 in) 

      Fig 2: Measuring Mainshaft (Rear Side) End Play
      G04203505Courtesy of NISSAN MOTOR CO., U.S.A.
    • Counter gear

    End play: 0 - 0.10 mm (0 - 0.004 in) 

    Fig 3: Measuring Counter Gear End Play
    G04203506Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Remove reverse idler gear according to the following.
    1. Remove reverse idler shaft assembly from adapter plate.
    2. Remove reverse idler thrust washer, reverse idler gear and reverse idler needle bearing from reverse idler shaft.
    Fig 4: Removing Reverse Idler Gear
    G04203507Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Remove reverse main gear and reverse synchronizer hub assembly according to the following.
    1. Remove snap ring from mainshaft using suitable tool.
      Fig 5: Removing Snap Ring From Mainshaft Using Tool
      G04203508Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Remove reverse main gear and reverse synchronizer hub assembly using suitable tool.
    3. Remove reverse main needle bearing from mainshaft.
    Fig 6: Removing Reverse Main Gear And Reverse Synchronizer Hub Assembly Using Tool
    G04203509Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Remove reverse coupling sleeve according to the following.
    1. Remove snap ring from reverse synchronizer hub.
    2. Remove spread springs and shifting inserts from reverse synchronizer hub.
    3. Remove reverse coupling sleeve from reverse synchronizer hub.
    Fig 7: Removing Snap Ring From Reverse Synchronizer Hub
    G04203510Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Remove reverse counter gear according to the following.
    1. Remove snap ring from counter gear using suitable tool.
      Fig 8: Removing Snap Ring From Counter Gear Using Tool
      G04203511Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Remove reverse counter gear using suitable tool.
  8. Remove counter rear bearing spacer from counter gear.
    Fig 9: Removing Counter Rear Bearing Spacer From Counter Gear
    G04203512Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Remove bearing retainer bolts, and then remove bearing retainer.
    Fig 10: Removing Bearing Retainer Bolts
    G04203513Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Remove main drive gear assembly, mainshaft assembly and counter gear assembly according to the following.
    1. Remove snap ring from mainshaft bearing using suitable tool.
      Fig 11: Removing Snap Ring From Mainshaft Bearing Using Tool
      G04203514Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Carefully tap mainshaft using suitable tool, and then remove main drive gear assembly, mainshaft assembly and counter gear assembly from adapter plate.
    3. Remove main pilot bearing, pilot bearing spacer from mainshaft.
    4. Remove 5th bulk ring from main drive gear.
    Fig 12: Removing Main Pilot Bearing From Mainshaft
    G04203515Courtesy of NISSAN MOTOR CO., U.S.A.
  11. Remove counter rear bearing from adapter plate.
    Fig 13: Removing Counter Rear Bearing From Adapter Plate
    G04203516Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Remove magnet from adapter plate.
    Fig 14: Removing Magnet From Adapter Plate
    G04203517Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Remove baffle plate bolt, and then remove baffle plate from adapter plate.
    Fig 15: Removing Baffle Plate Bolt
    G04203518Courtesy of NISSAN MOTOR CO., U.S.A.
  14. Remove breather from adapter plate.
    Fig 16: Removing Breather From Adapter Plate
    G04203519Courtesy of NISSAN MOTOR CO., U.S.A.
  15. Remove main drive gear bearing according to the following.
    1. Remove snap ring from main drive gear using suitable tool.
      Fig 17: Removing Snap Ring From Main Drive Gear Using Tool
      G04203520Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Press out main drive gear bearing using suitable tool.
    Fig 18: Pressing Out Main Drive Gear Bearing Using Tool
    G04203521Courtesy of NISSAN MOTOR CO., U.S.A.
  16. Before disassembling, measure the end play for mainshaft (Front side). If the end play is outside the standards, disassemble and inspect.

    End play: 0 - 0.10 mm (0 - 0.004 in) 

    Fig 19: Measuring End Play
    G04203522Courtesy of NISSAN MOTOR CO., U.S.A.
  17. Press out reverse main gear bushing, mainshaft bearing and 4th main gear using suitable tool.
  18. Remove 3rd-4th main spacer from mainshaft.
    Fig 20: Pressing Out Reverse Main Gear Bushing
    G04203523Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Remove 3rd main gear and 1st main gear according to the following.
    1. Press out 3rd main gear and 1st main gear using suitable tool.
      CAUTION: Be careful not to damage 1st outer bulk ring.
    2. Remove 1st needle bearing from mainshaft.
    Fig 21: Pressing Out 3rd Main Gear And 1st Main Gear Using Tool
    G04203524Courtesy of NISSAN MOTOR CO., U.S.A.
  20. Remove 1st-2nd synchronizer hub assembly and 2nd main gear according to the following.
    1. Press out 1st gear bushing, 1st-2nd synchronizer hub assembly and 2nd main gear using suitable tool.
      CAUTION: Be aware that when using the press, if mainshaft gear positioner catches on the V-block, etc., mainshaft could be damaged.
    2. Remove 2nd needle bearing from mainshaft.
  21. Remove 1st-2nd coupling sleeve according to the following.
    1. Remove spread springs and shifting inserts from 1st-2nd synchronizer hub.
    2. Remove 1st-2nd coupling sleeve from 1st-2nd synchronizer hub.
    Fig 22: Removing 1st-2nd Coupling Sleeve From 1st-2nd Synchronizer Hub
    G04203525Courtesy of NISSAN MOTOR CO., U.S.A.
  22. Remove 6th main gear and 5th-6th synchronizer hub assembly according to the following.
    1. Remove snap ring from mainshaft using suitable tool.
      Fig 23: Removing Snap Ring From Mainshaft Using Tool
      G04203526Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Press out 6th main gear and 5th-6th synchronizer hub assembly using suitable tool.
    3. Remove 6th needle bearing from mainshaft.
  23. Remove 5th-6th coupling sleeve according to the following.
    1. Remove spread springs and shifting inserts from 5th-6th synchronizer hub.
    2. Remove 5th-6th coupling sleeve from 5th-6th synchronizer hub.
    Fig 24: Pressing Out 6th Main Gear And 5th-6th Synchronizer Hub Assembly Using Tool
    G04203527Courtesy of NISSAN MOTOR CO., U.S.A.
  24. Remove 3rd counter gear, 3rd-4th synchronizer hub assembly, 4th counter gear according to the following.
    1. Press out 3rd counter gear, 3rd-4th synchronizer hub assembly, 4th counter gear, 4th needle bearing, 4th gear bushing, 4th counter gear thrust washer, and counter rear bearing inner race using suitable tool.
    2. Remove 3rd needle bearing from counter gear.
  25. Remove 3rd-4th coupling sleeve according to the following.
    1. Remove spread springs and shifting inserts from 3rd-4th synchronizer hub.
    2. Remove 3rd-4th coupling sleeve from 3rd-4th synchronizer hub.
    Fig 25: Removing 3rd Needle Bearing From Counter Gear
    G04203528Courtesy of NISSAN MOTOR CO., U.S.A.
  26. Press out 3rd gear bushing using suitable tool.
CAUTION: Do not use oil hole of 3rd gear bushing when press out.
Fig 26: Pressing Out 3rd Gear Bushing Using Suitable Tool
G04203529Courtesy of NISSAN MOTOR CO., U.S.A.
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