B & M Group 1938-62 Plunger & Rigid
The design of this gearbox goes back to the early 1930’s although applications have only been researched back to 1938. For earlier models refer to the maker’s parts books, see here. The list below covers 3 variations of what is essentially the same gearbox although the short lived 1946-48 B group variant has quite a few different parts from the other two. All parts are listed but are not necessarily available, click on a part number for current availability.
Key |
Description |
M 1938-48 |
B 1946-48 |
M/B 1949-62 |
Gearbox, various conditions | 65-3000 | 66-3001 | ||
1 |
Sprocket retaining nut | 24-4226 | 29-3835 | 24-4226 |
2 |
Sprocket retaining nut lockwasher | 24-4263 | 29-3836 | 24-4263 |
3 |
Sprocket, 19T | 65-3506 | ||
3 |
Sprocket, 18T | 24-4280 | 65-3370 | |
Sprocket 24-4280 does not have oil groove & should be used with 24-4065 sealed bearing | ||||
3 |
Sprocket, 15T B32 | 65-3398 | ||
4 |
Shell | 66-3028 | 65-3394U | 66-3140 |
5 |
Inspection plate oil baffle | 24-4288 | 24-4288 | |
6 |
Inspection cover gasket | 15-4110 (2) | 15-4110 | 15-4110 (2) |
7 |
Inspection cover plate screw, hex head | 27-4258 (4) | 27-4258 (4) | 27-4258 (4) |
8 |
Inspection cover plate | 66-3070 | 66-3070 | 66-3070 |
9 |
Sprocket oil seal | 24-4232 | 65-3372 | 65-3508 |
10 |
Mainshaft bearing oil retaining washer | 24-4225 | 29-3858 | 65-3509 |
11 |
Mainshaft bearing, clutch end | 24-4065 | 29-3857 | 24-4065 |
12 |
Layshaft bush packing washer | 66-3086 | ||
13 |
Gear control shaft bush, clutch end | 66-3084 | 65-3336 | 66-3084 |
14 |
Gear selector fork | 66-3248 | 65-3292 | 66-3290 |
15 |
Gear control shaft peg | 66-325 (2) | 66-3258 (2) | 66-3291 |
16 |
Gear selector fork | 66-3248 | 65-3292 | 66-3290 |
17 |
Gear control shaft | 66-3083 | 65-3156 | 66-3083 |
18 |
Gear control shaft bush, inner | 24-4245 | 24-4245 | |
19 |
Gear control shaft bush packing washer (as required) | 29-8740 | 66-3087 | |
20 |
Gear control index plunger sleeve | 15-4223 | 15-4223 | 15-4223 |
21 |
Plunger spring | 15-4225 | 15-4225 | 15-4225 |
22 |
Gear control plunger | 15-4224 | 15-4224 | 15-4224 |
23 |
Operating shaft nut | EB171 | EB171 | 2-440 |
24 |
Operating shaft washer | 15-39 | 15-39 | 15-39 |
25 |
Gear change operating shaft bush, inner | 15-4226 | 15-4226 | 15-4226 |
26 |
Gear change shaft | 15-4229 | 15-4229 | 15-4229 |
27 |
Nut | EA80 (2) | EA80 (2) | 2-49 (2) |
28 |
Shake proof washer | 36-382 (2) | 24-8784 | 36-382 (2) |
29 |
Gear change operating plate and pawl arm stop | 15-4228 | 15-4228 | 15-4228 |
30 |
Operating plate and pawl arm stop screw | M208 (2) | M208 (2) | 2-2211 (2) |
31 |
Operating plate | 15-4231 | 15-4231 | 15-4231 |
32 |
Circlip | 15-4240 | 15-4240 | 15-4240 |
33 |
Gear change pawl main spring | 15-4139 | 15-4139 | 15-4139 |
34 |
Pawl pivot | 15-4138 (2) | 15-4138 (2) | 15-4138 (2) |
35 |
Pawl carrier arm, lower | 15-4249 | 15-4249 | 15-4249 |
36 |
Pawl carrier arm, upper | 15-4236 | 15-4236 | 15-4236 |
37 |
Gear change pawl secondary spring | 15-4161 | 15-4161 | 15-4161 |
38 |
Gear change pawl, lower | 15-4141 | 15-4141 | 15-4141 |
39 |
Pawl pivot nut | 15-4143 (2) | 15-4143 (2) | 15-4143 (2) |
40 |
Pawl pivot locknut | M263 (2) | M263 (2) | 2-395 (2) |
41 |
Gear change pawl, upper | 15-4142 | 15-4142 | 15-4142 |
42 |
Gear change control rod | 15-4255 | 15-4255 | 15-4253 |
43 |
Gear control rod adjusting yoke locknut | 24-563 | 24-563 | 24-563 |
44 |
Gear control rod adjusting yoke or clevis | 15-4254 | 15-4254 | 15-4254 |
45 |
Gear change ratchet lever | 15-4206 | 15-4206 | 15-4206 |
46 |
Split pin for gear control rod pivot pin | 35-705 (2) | 35-705 (2) | 35-705 (2) |
47 |
Gear control rod pivot pin | 15-4221 (2) | 15-4221 (2) | 15-4221 (2) |
48 |
Gear change ratchet lever sleeve bush | 15-4227 | 15-4227 | 15-4227 |
49 |
Gear control shaft spacing collar | 15-4233 | 15-4233 | |
50 |
Gear control quadrant arm | 15-4239 | 15-4239 | 15-4239 |
51 |
Gear control quadrant lockwasher | 15-4232 | 15-4232 | 15-4232 |
Key |
Description |
M 1938-48 |
B 1946-48 |
M/B 1949-62 |
52 |
Gear change quadrant operating lever nut | EB201 | EB106 | 2-1813 |
53 |
Gear lever pinch bolt | 15-5153 | 65-3361 | 65-3361 |
54 |
Gear lever pinch bolt washer | 15-5155 | K234A | 2-525 |
55 |
Outer cover fixings (65-3062 = 2 ¼, 65-3063 = 1 ¾, 65-3357 = 2 ½, 66-3065 = 1 ½, | 66-3065 (6) | 65-3357 (4) | 66-3065 (5) |
65-3062 (2) | 65-3063 | |||
21-2896 (4) | ||||
56 |
Gear lever | 65-3171 | 65-3380 | 65-3417 |
56 |
Gear lever, in reversed position, B32/34 1949-62 | 42-3017 | ||
57 |
Gear change rubber (not WM20) | 29-3250 | 29-3250 | 29-3250 |
58 |
Kickstart rubber | 65-3212 | 65-3397 | 65-3212 |
59 |
Filler plug wash | 65-3365 | 67-42 | |
60 |
Filler plug | 65-3364 | 65-3364 | |
61 |
Kickstart lever, fixed | 15-4179 | 65-3381 | 15-4179 |
61 |
Kickstart lever, folding | 42-3037 | ||
62 |
Nut for outer cover stud | 29-3242 (4) | ||
63 |
Case screw (65-3356 = 3/8 x 2 9/16, 65-3062 = 2 ¼) | 65-3356 | 65-3062 (4) | |
64 |
Cotter pin (2-2579A for worn holes) | 2-2579 | 2-2579 | 2-2579 |
65 |
Kickstart spring anchor pin nut | EB102 | K457 | 2-443 |
66 |
Outer gasket | 66-3068 | 65-3355 | 66-3131 |
67 |
Grease nipple | 28-2080 | ||
68 |
Outer cover | 66-3102 | 65-3346 | 66-3125 |
69 |
Kickstart spindle bush, outer | 24-4258 | 65-3359 | 24-4258 |
70 |
Kickstart spring anchor pin | M588 | 24-4214 | 02-3718 |
71 |
Kickstart return spring (24-4300 = 1938-39) | 24-4300 | 65-3135 | 66-3058 |
66-3058 | ||||
72 |
Kickstart quadrant | 15-4121 | 65-3353 | 15-4121 |
73 |
Kickstart stop rubber wedge | 66-3259 | 29-3308 | 66-3259 |
74 |
Speedometer spindle bush, small | 65-3377 | 65-3377 | |
75 |
M21/33 | 65-3367 | 65-3367 | |
75 |
B32/4/M20 | 65-3402 | 65-3402 | |
76 |
Speedo driven gear bush | 65-3390 | 65-3396 | |
77 |
Speedo drive fibre washer | 65-3392 | 65-3392 | |
78 |
Speedo driven gear bush nut | 65-3391 | 65-3391 | |
79 |
Speedo driven gear bush cap nut | 65-3399 | ||
80 |
Speedo driven gear thrust washer | 65-3375 | ||
81 |
Layshaft bush, long kickstarter end | 24-4241 | 65-3116 | 66-3133 |
82 |
Layshaft | 24-4394 | 65-3386 | 66-3132 |
82 |
B32/4/M20 | 65-3401 | 65-3498 | |
83 |
Layshaft 1st gear bush | 66-3211 | 65-3479 | 66-3211 |
84 |
Layshaft 1st gear, 29T | 66-3209 | 65-3496 | 66-3209 |
85 |
Layshaft dog clutch | 24-4393 | 65-3131 | 24-4393 |
86 |
Layshaft 2nd gear, 25T | 66-3215 | 65-3494 | 66-3215 |
87 |
Layshaft 2nd gear bush | 66-3214 | 65-3478 | 66-3214 |
88 |
Layshaft 3rd/4th gear, 20/17T | 24-4221 | 65-3388 | 24-4221 |
89 |
Layshaft bush, short clutch end | 24-4223 | 65-3389 | 24-4223 |
90 |
Mainshaft packing washer, .005/.010 (as required) | 66-3071 or 66-3072 | 66-3071 | 66-3071 or 66-3072 |
91 |
Inner cover ball race oil flinger washer | 24-4235 | 24-4235 | |
92 |
Mainshaft 1st/2nd gear, 20/16T | 24-4231 | 24-4231 | |
92 |
Mainshaft 1st gear | 65-3475 | ||
93 |
Mainshaft 2nd gear | 65-3492 | ||
94 |
Mainshaft 3rd gear bush | 66-3214 | 65-3478 | 66-3214 |
95 |
Mainshaft 3rd gear, 25T | 66-3212 | 65-3494 | 66-3212 |
96 |
Mainshaft dog clutch | 24-4393 | 65-3131 | 24-4393 |
97 |
Mainshaft sleeve gear, 28T | 15-4165 | 65-3173 | 15-4165 |
98 |
Mainshaft sleeve gear bush | 66-3155 (2) | 65-3097 (2) | 66-3155 (2) |
99 |
Drain plug | 28-43 | 28-43 | 28-43 |
100 |
Outer cover stud, long | 29-3304 (2) | ||
101 |
Mainshaft bearing oil retaining washer | 24-4225 | 29-3858 | 24-4225 |
102 |
Mainshaft key for clutch | K139 | K139 | 2-433 |
103 |
Mainshaft | 15-4260U | 65-3382 | 15-4260U |
104 |
Gear control quadrant | 24-4247 | 65-3137 | 24-4247 |
105 |
Gear control quadrant plunger | 15-4035 | 15-4035 | 15-4035 |
106 |
Gear control quadrant bush | 24-4248 | 24-4248 | |
Key |
Description |
M 1938-48 |
B 1946-48 |
M/B 1949-62 |
107 |
Gear control quadrant plunger spring | 24-68 | 24-68 | 24-68 |
108 |
Gear control quadrant plunger cup | 24-4251 | 24-4251 | 24-4251 |
109 |
Inner gasket | 66-3069 | 65-3023 | 66-3069 |
110 |
Inner cover with bearing etc | 15-4211 | 65-3344 | 66-3128 |
111 |
Speedometer drive bush grub screw | 65-3400 | ||
112 |
Inner case screw (24-4214 = 9/16, 65-2157 = 1 1/8) | 24-4214 (2) | 24-4214 | 65-2157 (3) |
113 |
Dowel | 27-1589 (2) | 66-3074 (2) | |
114 |
Outer cover stud | 65-3073 | ||
115 |
Mainshaft bearing distance washer, kickstart end | 24-4237 | 24-4237 | |
116 |
Locking strip for 21-2888 bolts | 15-4246 | 15-4246 | 15-4246 |
117 |
Outer cover bolt, 3/4 | 21-2888 (2) | 21-2888 (2) | 21-2888 (2) |
118 |
Outer cover stud | 66-1910 | ||
119 |
Retaining washer | 24-4236 | 24-4236 | |
120 |
Mainshaft bearing, kickstart end | 24-4217 | 65-3116 | 24-4217 |
121 |
Bearing circlip, kickstart end | 67-3028 | ||
122 |
Kickstart ratchet | 66-3079 | 66-3079 | |
123 |
Kickstart ratchet pinion | 66-3080 | 65-3283 | 66-3080 |
124 |
Kickstart ratchet bush | 66-3081 | 29-3839 | 66-3081 |
125 |
Kickstart ratchet spring | 24-4256 | 29-3850 | 24-4256 |
126 |
Kickstart ratchet pinion sleeve nut | 24-4282 | 65-3139 | 24-4282 |
127 |
Kickstart ratchet lockwasher | 24-4278 | 65-3140 | 24-4278 |
128 |
Kickstart ratchet pinion locknut | 24-4255 | 24-4255 | |
129 |
Filler plug | M196 | ||
130 |
Filler plug washer | M196A | ||
132 |
Nut for outer cover stud | M263 | ||
134 |
Outer cover stud 1 3/32 Foot change only | 15-4208 | ||
135 |
Outer cover bolt | 15-4207 (2) | ||
136 |
Shake proof washer for 15-4207 bolts | 29-541 (2) | ||
137 |
Pin | 65-3169 | ||
138 |
Gear indicator plate | 15-4222 | ||
139 |
Gear change ratchet lever sleeve clip ring | 15-4219 | ||
The following parts are not illustrated on the drawing |
||||
Pawl carrier assembly, lower. Consists of 15-4249, 15-4138, 15-4142, |
15-4243 | 15-4243 | 15-4243 | |
15-4143, M263 |
||||
Pawl carrier assembly, upper. Consists of 15-4236, 15-4138, 15-4141, |
15-4242 | 15-4242 | 15-4242 | |
15-4143, M264 |
||||
Selector fork spindle core plug |
35-1079 | |||
Selector fork assembly |
66-3082 | 65-3155 | 66-3288 | |
Pawl carrier shim .024 |
15-4234 | 15-4233 or 15-4234 | ||
Pawl carrier shim .022 |
15-4235 | 15-4235 | ||
Spring washer for 15-4208 (Key 134) |
K197 | |||
Spring washer for 24-4214 (Key 71) |
29-541 | |||
Mainshaft sleeve gear thrust washer |
65-3098 | |||
Mainshaft sleeve gear thrust washer |
M144A | |||
Layshaft thrust washer |
65-3113 (2) | |||
Kickstart bush |
65-3116 | |||
Kickstart oil seal |
65-3354 | |||
Kickstart bush, inner |
65-3358 | |||
Kickstart stop plate |
65-3296 (2) | |||
Screw for speedometer spindle bush B31/3 |
65-3369 | |||
Screw for speedometer spindle bush B32/4 |
65-3400 | |||
Spring washer for speedometer spindle bush screw |
29-541 |
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