M GroupStandard bore sizes and piston to bore clearances are (Clearances in inches):- M20, 21 std bore = 82mm (M21 1937 = 85mm). Clearance .004/.006. M33 std bore = 85mm. Clearance .0045/.0065; split skirt .0006/.00275 | |||
7110 | Piston, STD, .20, .30, .40, .60 | M19 | 1937-38 |
7129 | Piston, STD, .60 | M22/23/24 | 1936-40 |
11957 | Piston, c.r. 4.9:1, STD, 20, 40, 60 | M20 | 1938-63 |
12659 | Piston, c.r. 5.0:1, STD, 20, 40, 60, 80 | M21 | 1939-58 |
11341 | Piston, c.r. 6.8:1, STD, 20, 40, 60 (long con-rod) | M33 | 1947-52 |
11744 | Piston, c.r. 7.5:1, STD, 20, 40, 60 (short con-rod) | M33 | 1952-57 |
12010 | Piston, c.r. 8.5:1, STD, 20, 40, 60 (long con-rod) | M33 | 1947-52 |
12659 | Piston, c.r. 4.9:1, STD, 20, 40, 60, 80 | M22/23/24 | 1936-40 |
R3670 | Piston rings, STD, 20, 40, 60 | M20/21/23/24 | 1938-63 |
RM11 | Piston rings, STD, 20, 30, 40 | M20/21/23/24 | 1938-63 |
| The piston will need to be re-grooved to fit the RM11 rings that are 3/32 and 5/32 thick. | |||
R3680 | Piston rings, STD, 20, 40, 60 | M33 | 1948-57 |
66-0953 | Gudgeon pin | M20/21/22/23/24/33 | 1938-63 |
65-0440 | Gudgeon pin | M19 | 1938-40 |
66-0954 | Circlip | M | 1938-62 |
66-0075 | Cylinder liner | M20/21 | 1938-62 |
2107 | Cylinder liner, cast iron barrels | M33 | 1946-60 |
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