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240sx Transmission – The Basics

December 10, 2009 by Aaron

Removal Procedure:

1. Remove shifter surround
2. Remove shifter
3. Undo driveshaft nuts (14mm ratchet ring spanner)
4. Disconnect electrical connections at gearbox
5. Remove clutch slave cylinder (14 mm)
6. Remove cat shield plate (10mm)
7. Undo exhaust center joint and remove gasket
8. Remove exhaust to gearbox support bracket
9. Remove driveshaft mounting bracket (17mm)
10. Undo bell housing bolts (14mm ratchet ring spanner)
11. Undo gearbox mounting (17mm)
12. Remove gearbox

Case Removal:

1.Drain Oil
2. Remove Release Bearing & Arm
3. Undo Bolts And Remove Plate In Bellhousing (Sealant)

4.Remove C clip from the Shaft and snap ring from Bearing In Bellhousing
5. Remove Top Cover & Spring From Casing
6. Knock Out Rollpins For Selector
7. Stand Bellhousing On Wood To Prevent Input Shaft Damage
8. Undo Main Gearbox Casing Bolts
9. Prise Rear Casing And Slide Back
10. Slip Out Selector From Top Cover Aperture
11. Remove Front Casing

Transmission Teardown:

1.Remove selector rod
2. Remove All Locking Springs And ball bearings from edge of main plate longest bolt at top)
3. Knock Out Top Roll Pin
4. Remove Top Rod
5. Knock Out Center Roll Pin
6. Withdraw Center Rod Through Two Selector Forks & Reverse Lock Rod Through Rear Selector Fork
7. Remove Center Selector Fork (Long End Of Tube Faces Center Plate)
8. Remove Top Selector Fork (Long End Of Tube Faces Center Plate)
9. Remove Bottom Rod ring clip
10. Knock Out Bottom Rear Roll Pin
11. Remove Bottom Rod
12. Remove Shaped Selector (Disengage Dowel Pin)
13. Remove Interlock Pin & Ball Bearings
14. Remove Rear Selector Fork & Bracket & Plunger Assembly
15. Remove Speedo Drive c clip, Then Speedo Drive & Locking Ball, Then 2nd c clip
16. Remove Next c clip, Then Bearing (NSK 6205 Japan), Then 4th c clip

17. Remove Left Handed Thread Nut (Not Mega Tight- Shims Can Move)

18. Remove Thrust Washer & Lock Pin

19. Remove Roller Bearing & Washer (Chamfer Towards Gear)

20. Undo Layshaft Nut

21. Remove Bearing (SNR 6204 France)

22. Remove 5th (Helical Gear – Shaft Inwards)

23. Remove Reverse Gear (Straight Gear – Shaft Outwards)

24. Remove Thrust Washer
25. Remove Mainshaft Cluster
26. Knock Shafts Part Way Through
27. Remove Layshaft Out Of Mesh
28. Remove Mainshaft
29. Mainshaft Centre Bearing – HR6306UR?
30. Layshaft Centre Bearing – HR6305UR?
31. Layshaft End Bearing – 22BCO6S5X Nachi Japan
32. Remove C clip & Idler Gear
33. Remove Center Plate (Torx 40 Screws)
34. Knock Out Mainshaft Center Bearing

Contents of rebuild kit:

Nissan part no. FS5W71C

Filed Under: 240sx Articles

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