Pre-Unit B & M Group
| Pre-unit B and M Group. As the 350 and 500 B group use the same 88mm stroke care must be taken to ensure that the correct wheels and connecting rod are used. All B and M models use the same big-end assembly except the Gold Stars. Not including Gold Stars, there are 3 connecting rod lengths, 7 3/8” between centres used in all B31, B33, B34 and M33 models to the end of 1952, 6 7/8” between centres used in the B33/M33 from 1953 and 8 ¼” between centres for the M20/21. The short 6 7/8” rod was also used in the B32 for 1956-57. Cast iron flywheels were used for all years of the M20/21 except 1947-49 and all AA models. The M20 has a stroke of 94mm, M21 is 112mm. | ||||
Part No | Description | Per | Model | Years |
02-0036 | Crankpin key (EA101) | 1 | B/M | 1937-63 |
02-0077 | Crankpin nut lock washer, locking screw | 2 | B/M | 1950-63 |
24-0371 | Big end assembly | 1 | Various inc 4.93 H.P. | 1927- |
24-0375 | Big end bearing roller, ¼ x 5/16 | 24 | B/M | 1938-63 |
24-2112 | Main bearing oil retaining washer | 1 | M (M22 only 1939) | 1937-39 |
24-2113 | Oil flinger, drive side | 1 | B/M | 1937-63 |
27-1239 | Rivet for shaft to flywheel | 14 | B/M | 1938-62 |
29-736F | Conrod assembly, inc big end | 1 | B1,B2 & B18 | 1936 |
31-0300 | Crankpin nut lock washer | 2 | B/M | 1937-63 |
65-0441 | Small end bush | 1 | B21/2 | 1937-39 |
65-0443 | Connecting rod only | B20 | 1937-38 | |
65-0444 | Con rod | B20 | 1937-38 | |
65-0444F | Connecting rod, big end and small end bush, exchange | B20 | 1937-38 | |
65-0459 | Connecting rod | 1 | B23/24/25/26 | 1937 |
65-0463 | Connecting rod | 1 | B23/24/25/26 | 1938-39 |
65-0464F | Connecting rod, big end assembly, exchange | 1 | B23/24 | 1937-39 |
65-0472 | Cage for big end rollers | 1 | B20 to 26 | 1937-39 |
65-0486 | Crank pin | 1 | B23/24/25/26 | 1937-40 |
65-0506 | Big end bearing roller cage | 1 | B/M | 1940-63 |
65-1233/5 | Crank assembly, with new big end | 1 | M33 | |
66-0262 | Big end assembly | 1 | B34 Goldstar | |
66-0480 | Connecting rod with bushes, marked 66-481 | 1 | M20/21 | 1938-63 |
66-0481 | Big end assembly only | 1 | M20/21 | 1938-63 |
66-0490 | Big end bearing outer race | 1 | B/M | 1937-63 |
66-0491 | Small end bush | 1 | M20/21 | 1937-63 |
66-0492 | Small end bush | 1 | B24/5/6/31/32/33/34 | 1938-60 |
66-0492 | Small end bush | 1 | M19/22/3/4/33 | 1948-55 |
66-0545 | Big end assembly with cage (Not GS which has bigger nuts!) | 1 | B/M except B/M24 | 1937-62 |
66-0610 | Crankshaft, complete with rod | 1 | B31/33 | |
66-0630 | Connecting rod thrust washer rivet | 6 | B23/4/5/6/31/32/33/34/M | 1937-63 |
66-0635 | Crankshaft, complete with rod | 1 | M20/M33 | |
66-0640 | Mainshaft, timing side | 1 | M20/1 | 1940-58 |
66-0644 | Mainshaft, drive side | 1 | M20/21/33 | 1940-58 |
EA62 | Crankpin nut lock washer, locking screw | 2 | B/M | 1937-49 |
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