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Triumph TR6 Gearbox - Internal |
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Page Contents
Uprated Laygears Non-Overdrive Gearbox Gearboxes fitted with 'A' type overdrive Gearboxes fitted with 'J' type overdrive
©Rimmer Bros Ltd - Registered in England No. 2155394. VAT No. GB 352 8473 40.
Constant Pinion & Main Shafts
Mainshaft Gears
Countershaft Gears
Reverse Gear
Gearbox Overhaul Kits
Close Ratio Gear Set
Consumables
Gearbox numbers prefixed 'CC' are later than 'CD' prefixed numbers. CF gearbox numbers have no relation to similar commission numbers. Individual gears may have been changed. 'CD' was the original prefix for TR6 PI model gearboxes.
1. 
Circlip (retaining) - (ar) - 58956
2. Washer - (1) - 60078
3. Bearing (constant pinion shaft) - (1) - 58391
4. Circlip (locating) - (1) - 58955
5. Oil Thrower - (1) - 60658
6. Gear Set (constant mesh) - (1) - 148949
To gearbox no. CD20281.
The gear set 148949 contains three matched items, a constant pinion shaft, constant gear and shell bearing, 145008. It should be used as a complete set to service gearboxes up to gearbox no. CD20281 and runs with mainshafts 208051 and 208052.
7. Constant Pinion - (1) - 216044
Gearbox no. CD20282 to CD21768.
Constant Pinion Shaft - (1) - 216871
From gearbox no. CD21769.
Constant Pinion Shaft - (1) - 219126
Later fitted alternative to 216871.
Care must be taken to ensure the angular cut of the teeth match between the constant gear and constant pinion shaft, by holding them together prior to installation in the gearbox. This angle is called the 'helix'.
8. Bearing (mainshaft spigot) - (1) - 145008
To gearbox no. CD20281.
9. Sleeve (spigot bearing) - (1) - 145008X
This is a precision ground steel sleeve which should be pressed into the constant pinion gear to enable the proper fitment of bearing 145008 and therefore allowing imperial nosed mainshafts to be compatible with the later metric bore constant pinion gear (part no. 219126).
10. Bearing (mainshaft spigot) - (1) - 158368
From gearbox no. CD20282.
Use with mainshafts 216393, 216866, TK824, UKC1933, TKC832.
11. Mainshaft (non-overdrive) - (1) - 208051
To gearbox no. CD20281.
Mainshaft (non-overdrive) - (1) - 216393
Gearbox no. CD20282 to CD21768.
Mainshaft (non-overdrive) - (1) - 216866
Gearbox no. CD21769 to commission no. CR5000/CF12500.
Mainshaft (non-overdrive) - (1) - TKC824
From commission no. CR5001/CF12501.
12. Mainshaft (overdrive 'A' type) - (1) - 208052
To gearbox no. CD20281.
Mainshaft (overdrive 'A' type) - (1) - UKC1933
From gearbox no. CD20282.
13. Mainshaft (overdrive 'J' type) - (1) - TKC832
From commission no. CR1/CF1.
14. Bearing (mainshaft centre) - (1) - 58391
15. Circlip (locating) - (1) - 58955
16. Washer (plain, bearing support) - (1) - 59443
17. Circlip (bearing retaining)* - (1) - 58956
18. Washer (plain, bearing supporting)* - (1) - 58949
19. Bearing (mainshaft rear)* - (1) - SP75G
* Fitted to non-overdrive gearboxes only.
20. Flange (mainshaft, square) - (1) - 58948
Non-overdrive 'A' type to gearbox no. CD15651.
21. Flange (mainshaft, round) - (1) - 518109
Non-overdrive & 'A' type from gearbox no. CD15652.
Flanges 58948 and 518109 are interchangeable.
Flange (mainshaft, round) - (1) - 160292
'J' type.
22. Washer - (1) - WP24
23. Nut (slotted) - (1) - 57868
Alternative.
24. Nut (nyloc) - (1) - 157642
Alternative.
25. Split Pin - (1) - PC12
Use with slotted nut.
26. Synchro Cup (3/4 synchro hub) - (2) - 113431
Early TR boxes used rings made of Iron Bronze a sintered metal containing copper and iron predominately. This provided synchronising (of sorts) and long life. The brass compounds used these days offer more synchronising though no where near that of modern gearboxes. In reality the actual ring size and friction area are inadequate. The working life of the ring is indicated externally by the gap between the dog teeth on the ring and the gear, from the 0.045 (new) down to 0.025 (worn) range. It is not unknown for less than scrupulous rebuilders to skim off the back face to give the appearance of a new ring. The problem here is that this ignores the relationship between the areas shown, A and B, to give the internals of the box their correct clearance.
27. Synchro Hub Assembly (3rd & 4th) - (1) - 509649
To gearbox no. CD19740.
Synchro Hub Assembly (3rd & 4th) - (1) - 153844
From gearbox no. CD19741.
28. Outer Sleeve (synchro hub) - (1) - 153844X
29. Ball - (3) - BLS108
30. Spring - (3) - 122075
To gearbox no. CD19740.
Spring - (3) - 153318
From gearbox no. CD19741.
31. Shim (spring tension adjusting) - (ar) - 37948
32. Circlip (retaining third gear) - (1) - 55707
33. Washer (retaining) - (1) - 156136
Alternative.
Washer (retaining) - (1) - 157054
Alternative.
34. Bush (third gear, brass) - (1) - 129940
To commission no. CR1/CF1.
Bush (third gear, steel) - (1) - 153238
From commission no. CR1/CF1.
Bush 153238 may be considered uprated and can be used to replace 129940.
35. Gear (third) - (1) - 105630
To gearbox no. CD20281.
Gear (third) - (1) - 152772
From gearbox no. CD20282.
36. Bush (second gear, brass) - (1) - 129939
To commission no. CR5000/CF12500.
Bush (second gear, steel) - (1) - UKC956
From commission no. CR5001/CF12501.
Bush, part no. UKC956, may only be fitted with 2nd gear TKC454 and the appropriate thrust washers (UKC956 to UKC961).
37. Bush (second gear, 2-piece steel, uprated) - (1) - 129939X
To commission no. CR5000/CF12500.
The brass second gear bush used to 1973 often breaks where its flange joins the cylindrical body. This breakage leads to excessive end float in the second and third gears, which in turn causes severe and rapid mechanical failure. A two piece steel bush and thrust washer is offered as an uprated replacement for the one piece brass item. The two piece steel bush set can not be used to replace the steel top hat shaped bush of the post 1973 gearboxes.
38. Gear (second) - (1) - 105629
To gearbox no. CD20281.
Gear (second) - (1) - 152771
Gearbox no. CD20282 to CD21768.
Gear (second) - (1) - 216802
From gearbox no. CD21769 to commission nu. CR5000/CF12500.
Gear (second) - (1) - TKC454
From commission no. CR5001/CF12501.
39. Gear Kit (second, uprated) - (1) - 152771X
40. Washer (spacer 0.118, silver)* - (ar) - 129941
Washer (spacer 0.121, green)* - (ar) - 129942
Washer (spacer 0.124, blue)* - (ar) - 129943
Washer (spacer 0.127, orange)* - (ar) - 129944
Washer (spacer 0.131, uncoloured)* - (ar) - 155951
Washer (spacer 0.132, yellow)* - (ar) - 134670
* To commission no. CR5000/CF12500.
Washer (spacer 0.197/0.199)** - (ar) - UKC958
Washer (spacer 0.200/0.202)** - (ar) - UKC959
Washer (spacer 0.203/0.205)** - (ar) - UKC960
Washer (spacer 0.206/0.208)** - (ar) - UKC961
** From commission no. CR5001/CF12501.
41. Synchro Cup (1/2 synchro hub) - (2) - 113431
42. Synchro Hub Assembly (1st & 2nd) - (1) - 515650
To gearbox no. CD19740.
Synchro Hub Assembly (1st & 2nd) - (1) - 153843
From gearbox no. CD19741.
43. Gear (1st & 2nd synchro hub) - (1) - 152773
44. Ball - (3) - BLS108
45. Spring - (3) - 122075
To gearbox no. CD19740.
Spring - (3) - 153318
From gearbox no. CD19741.
46. Shim (spring tension adjusting) - (ar) - 37948
47. Washer (spacer 0.118, silver) - (ar) - 129941
Washer (spacer 0.121, green) - (ar) - 129942
Washer (spacer 0.124, blue) - (ar) - 129943
Washer (spacer 0.127, orange) - (ar) - 129944
Washer (spacer 0.131, uncoloured) - (ar) - 155951
Washer (spacer 0.132, yellow) - (ar) - 134670
48. Bush (first gear, brass) - (1) - 129940
To commission no. CR1/CF1.
Bush (first gear, steel) - (1) - 153238
From commission no. CR1/CF1.
Bush 153238 may be considered uprated and can be used to replace 129940.
49. Gear (first, 33 teeth, use with 128107) - (1) - 128100
To gearbox no. CD20281.
Gear (first, 33 teeth, use with 128107) - (1) - 152770
From gearbox no. CD20282 to commission no. CR5000/CF12500.
Gear (first, 32 teeth, use with UKC662) - (1) - 152803
From commission no. CR5001/CF12501.
50. Washer (between 1st gear and bearing) - (1) - 116496
51. Thrust Washer (countershaft, front) - (1) - 129955
52. Bearing (countershaft, open cage type) - (2) - 150339
53. Circlip (countershaft bearing retaining) - (2) - 147749
54. Spacer (supporting bearing) - (2) - 154396
Use with bearing 150339.
55. Bearing (countershaft, shell type) - (2) - 126862
Alternative.
The shell type countershaft bearing, part no. 126862, introduced on TR3Bs and TR4s was never actually fitted to production TR5s or TR6s. By this time the factory, to improve the durability of the countershaft bearings, had changed production gearboxes to use the open cage type bearing, this type being a more efficient high speed bearing arrangement. The earlier shell type bearings do however appear in the later gearboxes as they proved to be a good alternative to salvage countershaft gears with slightly pitted bearing surfaces. When fitting new countershafts and gears the open cage bearings should always be used. The 126862 shell type bearing is identifiable by an external solid steel shell or case. It is a press fit in the countershaft gear . The 150339 open cage bearing is loose fitted in the counter gear and is retained by a spacer and circlip on early installations. If the countershaft gear has a circlip groove, it must be fitted with a circlip to retain the bearing.
56. Constant Gear (countershaft) - (1) - see note below.
To gearbox no. CD20281.
This item should be fitted with its matched parts in kit number 148949 (see item 6).
Constant Gear (countershaft) - (1) - 142434
Gearbox no. CD20282 to CD21768.
Constant Gear (countershaft) - (1) - 159621
From gearbox no. CD21769.
57. Distance Piece - (1) - 59456
58. Gear (countershaft, third) - (1) - 140509
59. Gear (countershaft, second) - (1) - 140508
To gearbox no. CD30646.
Gear (countershaft, second) - (1) - 155047
From gearbox no. CD30647.
60. Laygear (1st & reverse) - (1) - 128107
With 16 tooth first gear - use with 128100 & 152770.
To commission no. CR5000/CF12500.
Laygear (1st & reverse) - (1) - UKC662
With 17 tooth first gear - use with 152803.
From commission no. CR5001/CF12501.
It is strongly recommended that UKC662 (with its matching 1st speed gear 152803) be used for all uprated/modified engine/competition boxes.
Most TR owners know that the Stag and Police spec saloon gearboxes were uprated by modifications to the weak zones of the laygear and shaft, and the replacement of the bimetal thrust washers with needle bearing thrusts. The rear end of the shaft and gearbox became 'metric', so this conversion would be quite difficult. These uprated laygears come complete with 3 bearings and fittings. The twin bearing fitted to the rear end, each have twice the load capacity of the original (150339). They fit the standard gearbox and layshaft, so no modifications are required. If your gearbox has suffered such a failure, you will appreciate this is a fit and forget solution.
Laygear Kit (uprated) - (1) - 128107UR
Includes bearings, circlips and thrust washers.
Laygear Kit (uprated) - (1) - UKC662UR
Includes bearings, circlips and thrust washers.
61. Thrust Washer (countershaft, rear) - (1) - 129956
62. Countershaft - (1) - 128105
63. Plate (locking countershaft and reverse) - (1) - 129938
Gear spindle.
64. Screw (countersunk, lock plate to gearbox casing) - (1) - 129954
65. Gear (reverse) - (1) - 128110
66. Bush (reverse gear) - (1) - 129862
67. Reverse Gear Spindle - (1) - 129937
68. Lever (reverse operating) - (1) - 129894
69. Pin (fulcrum, reverse operating lever) - (1) - 106448
70. Nut (nyloc) - (1) - GHF273
71. Washer (plain) - (1) - WP36
72. Gearbox Overhaul Kit - (1) - RR1386
The above kit contains the following parts :-
73. Gasket Set (gearbox) - (1) - 515121
74. Oil Seal (constant pinion) - (1) - 141756
75. Oil Seal (rear) - (1) - 146129
3. Bearing (constant pinion shaft) - (1) - 58391
8. Bearing (mainshaft spigot) - (1) - 145008
To gearbox no. CD20281.
10. Bearing (mainshaft spigot) - (1) - 158368
From gearbox no. CD20282.
14. Bearing (mainshaft centre) - (1) - 58391
19. Bearing (mainshaft rear) - (1) - SP75G
26. Synchro Cup (3/4 synchro hub) - (2) - 113431
32. Circlip (retaining third gear) - (1) - 55707
41. Synchro Cup (1/2 synchro hub) - (2) - 113431
51. Thrust Washer (countershaft, front) - (1) - 129955
52. Bearing (countershaft, open cage type) - (2) - 150339
53. Circlip (countershaft bearing retaining) - (2) - 147749
61. Thrust Washer (countershaft, rear) - (1) - 129956
62. Countershaft - (1) - 128105
63. Plate (locking countershaft) - (1) - 129938
64. Screw (countersunk, lock plate to gearbox casing) - (1) - 129954
72. Gearbox Overhaul Kit - (1) - RR1387
Not illustrated.
The above kit contains the following parts :-
73. Gasket Set (gearbox) - (1) - 515121
Gasket (overdrive adaptor) - (1) - 502556
74. Oil Seal (constant pinion) - (1) - 141756
75. Oil Seal (rear) - (1) - 146129
3. Bearing (constant pinion shaft) - (1) - 58391
8. Bearing (mainshaft spigot) - (1) - 145008
To gearbox no. CD20281.
10. Bearing (mainshaft spigot) - (1) - 158368
From gearbox no. CD20282.
14. Bearing (mainshaft centre) - (1) - 58391
19. Bearing (mainshaft rear) - (1) - SP75G
26. Synchro Cup (3/4 synchro hub) - (2) - 113431
32. Circlip (retaining third gear) - (1) - 55707
41. Synchro Cup (1/2 synchro hub) - (2) - 113431
51. Thrust Washer (countershaft, front) - (1) - 129955
52. Bearing (countershaft, open cage type) - (2) - 150339
53. Circlip (countershaft bearing retaining) - (2) - 147749
61. Thrust Washer (countershaft, rear) - (1) - 129956
62. Countershaft - (1) - 128105
63. Plate (locking countershaft) - (1) - 129938
64. Screw (countersunk, lock plate to gearbox casing) - (1) - 129954
72. Gearbox Overhaul Kit - (1) - RR1388
Not illustrated.
The above kit contains the following parts :-
73. Gasket Set (gearbox) - (1) - 515121
Gasket (overdrive adaptor) - (1) - 159369
74. Oil Seal (constant pinion) - (1) - 141756
75. Oil Seal (rear) - (1) - NKC39A
3. Bearing (constant pinion shaft) - (1) - 58391
10. Bearing (mainshaft spigot) - (1) - 158368
14. Bearing (mainshaft centre) - (1) - 58391
19. Bearing (mainshaft rear) - (1) - SP75G
26. Synchro Cup (3/4 synchro hub) - (2) - 113431
32. Circlip (retaining third gear) - (1) - 55707
41. Synchro Cup (1/2 synchro hub) - (2) - 113431
51. Thrust Washer (countershaft, front) - (1) - 129955
52. Bearing (countershaft, open cage type) - (2) - 150339
53. Circlip (countershaft bearing retaining) - (2) - 147749
61. Thrust Washer (countershaft, rear) - (1) - 129956
62. Countershaft - (1) - 128105
63. Plate (locking countershaft) - (1) - 129938
64. Screw (countersunk, lock plate to gearbox casing) - (1) - 129954
Suitable for all Triumph gearboxes with needle roller constant pinion bearings, including 2000 but not Stag or Sprint. The gear set uses a 1" x 23 spline input shaft to allow use of a wider range of clutches. It also includes 3rd and 4th gear pairs and an adaptor enabling fitment to the big nose or imperial spigoted mainshaft. Suits lower axle ratio e.g. 4.1:1
76. Close Ratio Gear Set - (1) - RR1512
77. Lithium Grease (400gm) - (ar) - GGL111
78. WD40 (400ml can) - (ar) - GAC111
79. Jointing Compound (80ml) - (ar) - GHF6093
80. Studloc (Loctite, 10ml) - (ar) - GAC100
81. Grease (copper, anti-seize, 85gm) - (ar) - RX1345
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The 'Triumph', 'Rover' and 'British Motor Heritage' Logos used herein are Registered Trade Marks of British Motor Heritage Ltd,
and are used with their Licence under the Special 'Heritage' approval Scheme.
All original part numbers & illustrations have been reproduced by kind permission of British Motor Heritage.