Disassembling M46

1. Mount transmission on fixture P/N 5130 on floor stand P/N 2520 or bench support P/N 5154.
2. Drain oil.





3. Remove gear shift assembly.





4. Remove transmission cover and gasket.
5. Remove selector plate and return spring. Lift off washers, spring and ball.





6. Disconnect overdrive from intermediate housing. If required, use puller P/N 2709.
7. Remove gear selector rod. Tap out both lock pins.





8. Remove intermediate housing. Remove gasket. Collect adjusting shims.





9. Remove clutch fork and clutch release bearing. Save spacer washer.
10. Remove clutch housing and gasket. Save adjusting shims. Tap pipe rearwards to loosen seal. Some pipes have a lock ring, remove it first.





11. Tap out lock pin (1).
12. Remove selector shaft (2).
13. Remove shift forks (3).
14. Remove selector shaft seal (4).

5177 Puller:

15. Remove outer races for countershaft bearings.

NOTE: Transmission with aluminum housing: Carefully tap shaft in both directions to enable puller P/N 5177 to grip races.





16. Remove main shaft bearings.
- Remove oil pump eccentric.
- Remove lock ring and ring for main shaft bearing.
- Place tool P/N 2985 between input shaft and front synchronizer.
- Use puller P/N 5058, two extensions 5148 and puller bolt P/N 5147 to pull off bearing.
- Remove bearing thrust washer but leave tool P/N 2985 in position.





Removing All Shafts
17. Remove input shaft and synchronizer ring. Pull out shaft. If bearing sits tight in housing, leave tool P/N 2985 in place and tap main shaft with a mallet.

NOTE: Make sure that front part of countershaft contacts bottom of housing.





18. Lift out main shaft. First turn transmission.
19. Lift out countershaft. Turn transmission back. Use a plastic mallet to tap out rear bearing race. Remove shaft.





20. Remove reverse gear wheel and shaft. Use a drift to push shaft rearwards.
21. Remove selector for reverse gear.





Disassembling Main Shaft

NOTE: Transmission equipped with damper:

22. Press off washer, remove springs and brake ring. Remove 1st gear with synchronizer ring. Remove lock ring for synchronizer hubs.

2853 Support:

23. Press off 1st-2nd synchronizer hub and 2nd gear wheel with synchronizer ring. Use support P/N 2853.





24. Press off 3rd-4th synchronizer hub and 3rd gear wheel. Use support P/N 2853.





25. Disassemble synchronizers.

5131 Puller:

26. Remove countershaft bearing. Use puller P/N 5131.





27. Remove input shaft bearing. Use support P/N 2853.
28. Clean and examine all parts. Wash all parts with solvent. Dry with compressed air. Examine all parts. Replace worn or damaged parts and all seals and gaskets.