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Triumph TR6 'J' Type Overdrive |
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Page Contents
CR/CF 1973 to 1976 Rear Casing & Operating Piston
Dashpot, Relief Valve, Pump & Sunwheel
Uni-Directional Clutch, Brake Ring & Members
©Rimmer Bros Ltd - Registered in England No. 2155394. VAT No. GB 352 8473 40.
'J' Type Overdrive
Main Casing & Solenoid
Rear Casing & Operating Piston
Sump Cover & Filters
Dashpot, Relief Valve, Pump & Sunwheel
Uni-Directional Clutch, Brake Ring & Members
Annulus & Rear Flange
Overdrive Overhaul Kits
Consumables
The 'J' Type overdrive made by Laycock was fitted from 1973 model year on as an option and was originally operable in 3rd and 4th gears only. It provides a 25% reduction to the engine speed for a given road speed when engaged.
1. 
Overdrive Unit ('J' type, new) - (1) - 313242
Commission no. CR1 to CR6701, CF1 to CF35000. Serial no. 25/115838.
Overdrive Unit ('J' type) - (1) - 313242R
Reconditioned exchange. Commission no. CR1 to CR6701, CF1 to CF35000. Serial no. 25/115838.
Overdrive Unit ('J' type, new) - (1) - RKC1971
From commission no. CF35001. Serial no. 25/115876.
Overdrive Unit ('J' type) - (1) - RKC1971R
Reconditioned exchange. From commission no. CF35001. Serial no. 25/115876.
NOTE: Ensure gearbox is clean internally before fitting overdrive - avoiding cross-contamination from dirty oil.
2. Gasket (adaptor to gearbox) - (1) - 132465
3. Adaptor (gearbox to overdrive) - (1) - 312305
4. Gasket (adaptor to overdrive) - (1) - 159369
5. Screw (plain, adaptor to gearbox) - (6) - HU858
6. Washer (locking) - (6) - WL208
7. Nut (overdrive to adaptor) - (8) - NKC69
8. Washer (locking) - (8) - NKC70
9. Stud (overdrive to chassis mounting) - (2) - 160219
10. Washer (locking) - (2) - WL209
11. Nut - (2) - HN2009
12. Mainshaft (from gearbox - (1) - TKC832
13. Cam (pump driving) - (1) - 159505
14. Key (woodruff, cam driving) - (1) - KW316
15. Circlip (cam retaining) - (1) - 137308
16. Spring Clip (around mainshaft) - (1) - 159503
17. Angle Drive - (1) - 120694
18. Washer (sealing) - (1) - 500463
19. Speedometer Cable (63") - (1) - GSD109
RH steering.
Speedometer Cable (69") - (1) - GSD169
LH steering.
The 69" long speedometer cable is the one preferred for RH steering cars as it allows that little extra length when routing. Remember all cables must be securely clipped to prevent chaffing or snagging.
20. Main Casing Assembly (service kit) - (1) - NKC18
21. Stud (front, 1 1/4" long) - (6) - NKC56
Commission no. CR1 to CR6701, CF1 to CF35000. Serial no. 25/115838.
Stud (front, 1 3/8" long) - (6) - RTC553
From commission no. CF35001. Serial no. 25/115876.
22. Stud (front, 1" long) - (2) - NKC57
Commission no. CR1 to CR6701, CF1 to cf35000. Serial no. 25/115838.
Stud (1" long) - (2) - 37H1897
From commission no CF35001. Serial no. 25/115876.
23. Stud (rear, 2 3/4" long) - (4) - NKC58
24. Stud (rear, 3 1/8" long) - (2) - NKC59
25. Nameplate (blue) - (1) - NKC74
26. Screw (drive, securing nameplate) - (2) - NKC98
27. Solenoid and Valve Assembly - (1) - NKC41
28. Washer (copper ) - (1) - NKC108
Washer (dowty) - (1) - NKC108X
Alternative.
29. 'O' Ring - (2) - NKC107
30. Wire (solenoid earthing) - (1) - NKC67
The overdrive solenoid earthing wire NKC67 is an often ignored but very important part of the overdrive operating electrical system. Without it the solenoid will not work. Good electrical contact and continuity must be maintained through this somewhat insignificant wire or an inoperative J type overdrive will be encountered.
31. Rear Casing (annulus housing) - (1) - NKC38
Commission no. CR1 to CR6701, CF1 to CF35000. Serial no. 25/115838.
Rear Casing (annulus housing) - (1) - RTC1951
From commission no CF35001. Serial no. 25/115876.
32. Nut (rear casing to main) - (6) - NKC90
33. Washer (locking) - (4) - NKC88
34. Washer (plain) - (2) - NKC89
35. Pinion & Gear Assembly (speedo drive) - (1) - NKC48
36. Speedometer Drive Housing Assembly - (1) - NKC42
37. 'O' Ring - (1) - NKC106
38. Oil Seal - (1) - NKC105A
39. Retainer Assembly - (1) - NKC43
40. Screw (attaching retainer) - (1) - NKC80
41. Washer (locking) - (1) - NKC70
42. Operating Piston - (2) - NKC21
43. 'O' Ring - (2) - NKC99A
44. Plug (lubrication) - (1) - NKC93
45. Spring - (1) - NKC94
46. Ball - (1) - NKC95
47. Cover (sump) - (1) - NKC54
48. Magnet Set - (2) - 37H1943
49. Gasket (sump) - (1) - NKC76
50. Screw (plain, sump cover to casing) - (6) - NKC64
51. Washer (locking) - (6) - NKC110
52. Plug (filter retaining) - (1) - NKC24
53. Washer - (1) - NKC11
54. Filter (suction) - (1) - NKC53
55. Filter (pressure) - (1) - NKC23
56. Plug - (1) - NKC97
57. Washer (sealing plug) - (1) - NKC96
58. Dashpot Plug Kit - (1) - NKC13
59. 'O' Ring - (1) - NKC91
60. Dashpot Piston Assembly - (1) - NKC15
61. Relief Valve Assembly - (1) - NKC36
62. Spring (relief valve) - (1) - NKC104
63. Dashpot Sleeve - (1) - NKC14
64. 'O' Ring - (1) - NKC92
65. Body (relief valve) - (1) - NKC30
66. 'O' Ring (large) - (1) - NKC92
67. 'O' Ring (small) - (1) - NKC102A
68. Non-Return Valve Kit - (1) - NKC29A
69. Pump Plug - (1) - NKC26A
70. 'O' Ring - (1) - NKC101A
71. Pump Body - (1) - NKC25
72. 'O' Ring - (1) - NKC100
73. Pump Plunger Assembly - (1) - NKC28
74. Sunwheel - (1) - NKC55
75. PLanet Gear & Carrier Assembly - (1) - NKC22
76. Bearing and Spindle Kit - (1) - 37H1949
77. Clutch Assembly (uni-directional) - (1) - NKC17
78. Inner Member (uni-directional clutch) - (1) - NKC16
79. Cage (roller retaining) - (1) - 518110
80. Spring (cage locating) - (1) - 513208
81. Roller Set - (1) - 506063A
82. Oil Thrower - (1) - NKC20
83. Circlip - (1) - NKC77A
84. Thrust Washer - (1) - NKC79
85. Brake Ring - (1) - NKC10
86. Gasket (brake ring to housing) - (1) - NKC86
87. Gasket (annulus housing) - (1) - NKC87
88. Bridge Piece - (2) - 500587
89. Nut (self-locking) - (4) - 520977
90. Clutch Assembly (sliding member) - (1) - NKC40
Clutch Assembly (sliding member) - (1) - NKC40R
Reconditioned exchange.
91. Bearing Housing Assembly - (1) - NKC62
92. Bolt - (4) - NKC109
93. Bearing (clutch) - (1) - NKC63
94. Operating Spring - (4) - NKC12
95. Circlip (bearing) - (1) - NKC84
96. Circlip (clutch) - (1) - NKC85
97. Circlip (sun gear) - (1) - NKC83
98. Annulus Assembly - (1) - NKC9
99. Bearing (annulus head) - (1) - SP74G
100. Gear (speedometer drive) - (1) - NKC47
Commission no. CR1 to CR6701, CF1 to CF35000. Serial no. 25/115838.
Gear (speedometer drive) - (1) - AAU1096
From commission no. CF35001. Serial no. 25/115876.
101. Spacer (annulus shaft) - (1) - NKC78
102. Bearing (annulus tail) - (1) - 513897
103. Oil Seal (rear casing to flange) - (1) - NKC39A
104. Flange (mainshaft, round) - (1) - 160292
105. Washer - (1) - NKC82A
106. Nut (nyloc) - (1) - NKC81
Our overdrive overhaul kits contain the following selection of parts. Everything that you will want to service during any rebuild.
107. Overdrive Overhaul Kit - (1) - RR1519
The above kit contains the following parts :-
2. Gasket (adaptor to overdrive) - (1) - 159369
4. Gasket (adaptor to gearbox) - (1) - 132465
28. Washer (copper) - (1) - NKC108
29. 'O' Ring - (2) - NKC107
37. 'O' Ring - (1) - NKC106
38. Oil Seal - (1) - NKC105A
43. 'O' Ring - (2) - NKC99A
49. Gasket (sump) - (1) - NKC76
50. 'O' Ring - (1) - NKC91
61. Relief Valve - (1) - NKC36
64. 'O' Ring - (1) - NKC92
66. 'O' Ring (large) - (1) - NKC92
67. 'O' Ring (small) - (1) - NKC102A
70. 'O' Ring - (1) - NKC101A
72. 'O' Ring - (1) - NKC100
83. Circlip - (1) - NKC77A
86. Gasket (brake ring to housing) - (1) - NKC86
87. Gasket (annulus housing) - (1) - NKC87
93. Bearing (clutch) - (1) - NKC63
94. Operating Spring (set of 4) - (1) - NKC12
95. Circlip (bearing) - (1) - NKC84
96. Circlip (clutch) - (1) - NKC85
97. Circlip (sun gear)1 - (NKC83) -
99. Bearing (annulus head) - (1) - SP74G
102. Bearing (annulus tail) - (1) - 513897
103. Oil Seal (rear casing) - (1) - NKC39A
108. Overdrive Seal & Gasket Kit - (1) - RR1520
The above kit contains the following parts :-
2. Gasket (adaptor to gearbox) - (1) - 132465
4. Gasket (adaptor to overdrive) - (1) - 159369
28. Washer (copper) - (1) - NKC108
22. 'O' Ring - (2) - NKC107
37. 'O' Ring - (1) - NKC106
38. Oil Seal - (1) - NKC105
43. 'O' Ring - (2) - NKC99
49. Gasket (sump) - (1) - NKC76
59. 'O' Ring - (1) - NKC91
64. 'O' Ring - (1) - NKC92
66. 'O' Ring (large) - (1) - NKC92
67. 'O' Ring (small) - (1) - NKC102
70. 'O' Ring - (1) - NKC101
72. 'O' Ring - (1) - NKC100
86. Gasket (brake ring to housing) - (1) - NKC86
87. Gasket (annulus housing) - (1) - NKC87
103. Oil Seal (rear casing to flange) - (1) - NKC39A
109. WD40 (400ml can) - (ar) - GAC111
110. Jointing Compound (80ml) - (ar) - GHF6093
111. Studloc (Loctite, 10ml) - (ar) - GAC100
112. Hypoid 90 Gear Oil (0.5 litre) - (ar) - GGL190
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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.