Installing Piston Pin Lock Ring

All pistons, including 61" O.H.V. pistons in the lower oversize steps, have two horizontal ^lots, one front and one rear, in bottom ring groove. 61" O.H.V. piston in the larger oversize steps is slotted horizontally and also has a vertical slot in one thrust face. Piston with only the horizontal slots may be installed with either thrust face to the front. Piston with vertical slot in one thrust face must be installed with that thrust face to the front.

Pistons obtained from the factory, standard or oversize, are fitted with pin correctly fitted and piston rings installed. Piston pin lock rings are also supplied, one assembled on pin, the other one loose. Check ring gaps in cylinder being refitted.

Piston Rings

Piston rings are of three types—compression (plain face) ring; standard type oil control (channeled face) ring; special type oil control (slotted face) ring.

Piston rings are to be installed as follows:

61" O.H.V. Engine (except in city police service) and 74" and 80" Side Valve Engine—front piston, three compression rings; rear piston, one standard type oil control ring (in bottom groove) and two compression rings.

74" O.H.V. Engine (except in city police service)— each piston, one standard type oil control ring (in bottom groove) and two compression rings.

61" and 74" O.H.V. Engine (in city police service) —each piston, one special type oil control ring (in bottom groove) and two compression rings.

Piston rings are regularly supplied in following oversizes:

Compression rings and standard type oil control

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