Pre-Unit M Group
| M Group (not M22, 23, 24, 33). Cast iron up to 1950 and aluminium alloy from 1951. Up to 1949 (to 1957 for AA models) a liner was fitted as standard. Same head and cylinder used on M20 and M21.
For gaskets see here |
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Part No |
Description |
Per |
Models |
Years |
| Cylinder head – please enquire | ||||
| Cylinder – please enquire | ||||
PACK-INTER-002 |
Top end overhaul pack | A | All | All |
02-0049 |
Carburettor fixing nut | 2 | M | 1937-63 |
02-0443 |
Exhaust lifter lever nut | 1 | M | 1951-63 |
02-0861 |
Head bolt washer | 10 | M20/21 | 1949-63 |
02-1584 |
Exhaust lifter cable toggle screw | 1 | M | 1937-62 |
02-1588 |
Exhaust lifter cable toggle nut | 1 | M | 1937-62 |
15-0152 |
Cylinder base nut | 5 | M not M33 | 1937-62 |
15-1367 |
Carburettor stud | 2 | M | 1948-49 |
15-5155 |
Carburettor stud plain washer | 2 | M | 1940-63 |
15-5196 |
Carburettor fixing nut | 2 | M24 | 1938-39 |
24-5205 |
Carburettor stud | 2 | M | 1937-47 |
24-8328 |
Timing hole bolt | 1 | M20/21 | 1939-62 |
24-8784 |
Carburettor spring washer | 2 | M | 1937-39 |
29-0541 |
Exhaust lifter shake proof washer | 1 | M | 1940-63 |
35-1086 |
Head bolt, short, 1 7/16 | 3 | M20/21 | 1937-39 |
35-1086 |
Head bolt, short, 1 7/16 | 5 | M20/21 | 1940-49 |
36-0011 |
Head bolt, long, 1 ¾ | 5 | M20/21 | 1937-49 |
36-0011 |
Head bolt, long, 1 3/4 | 10 | M20/21 | 1950-63 |
36-0382 |
Carburettor shake proof washer | 2 | M | 1940-63 |
66-0088 |
Cylinder | 1 | M20/21 | 1939-51 |
66-0132 |
Cylinder | 1 | M20/21 | 1952-63 |
66-0242 |
Valve spring cover, cast alloy, except WM20 | 1 | M20/21 | 1937-62 |
66-0244 |
Valve spring cover, flat steel | 1 | WM20 | 1940-45 |
66-1431 |
Exhaust lifter lever | 1 | M | 1937-54 |
66-1432 |
Exhaust lifter lever spring | 1 | M | 1937-63 |
66-1434 |
Exhaust lifter bush | 1 | M20/21 | 1937-63 |
66-1435 |
Exhaust lifter spindle | 1 | M20/21 | 1937-63 |
66-1436 |
Exhaust lifter lever | 1 | M | 1955-63 |
66-1933 |
Valve spring cover screw | 4 | M | 1938-63 |
66-8507 |
Exhaust lifter cable toggle | 1 | M | 1937-62 |
66-9250 |
Carburettor stud | 2 | M | 1949-58 |
EA80 |
Carburettor fixing nut | 2 | M | 1937-49 |
EB76A |
Head bolt washer (7 per 1938-39, 9 per 1940-48) | 7/9 | M20/21 | 1937-48 |
EB102 |
Exhaust lifter lever nut | 1 | M | 1937-50 |
27-8119 |
Engine steady stay nut, 1/2x20TPI | M24 | 1940 | |
66-0098 |
Head steady | 1 | M | 1940-48 |
66-0421 |
Head steady | 1 | M20/21 | 1949-63 |
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