Pre-unit C Group

Standard bore sizes and piston to bore clearances are (Clearances in inches):- C10, 10L std bore = 63mm. Clearance .0045/.0065. C11, 11G, 12 std bore =63mm. Clearance .0035/.0055

681

 Liner ONLY (plain liner not flanged) C10, 10L, 11, 11G, 12

7150

 Piston, STD / 20 / 30 / 40 / 60
 C10, 10L 1939-57

15504

 Piston, c.r. 6.5:1, STD, 20, 30, 40, 60 C12 1940-41

8267

 Piston, 6.5:1, STD, 20, 30, 40, 60 C11, 11G, 12 1939-58

R3660

 Piston rings, STD, 20, 30, 40, 60 C12 1940-41

R3640

 Piston rings, STD, 20, 40, 60 C 1946-58

65-0437

 Gudgeon pin C12 1940-41

65-0438

 Piston circlip, wire type for genuine pistons C 1946-58

65-0438A

 Piston circlip, Seeger type, Hepolite pistons C 1946-58

66-0954

 Circlip C12 1940-41

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