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

No products were found matching your selection, but we still might be able to help! Give us a call on 01986 894798 or email spares@draganfly.co.uk