INFLATION AR-AIR 2418841 - Caterpillar

Illustration 1 g00810124
(1) Piston
(2) Piston pin
(3) Pin retainer
(4) Connecting rod Piston (1) has two compression rings and one oil ring.The movement of the rings in the piston groove results in a constantly changing clearance between the rings and the grooves. This action (scrubbing) results in both a reduction of carbon deposit and potentially sticky rings. The oil rings are a standard type, and the oil rings are spring loaded. The holes in the oil rings return the engine oil to the crankcase.The piston has a full floating piston pin (2) that is held in the piston by two pin retainers (3). The pin retainers fit into grooves in the piston pin bore.The piston pin end of connecting rod (4) is tapered. This taper provides more bearing surface at the area of highest load. The connecting rod is installed on the piston with the bearing tab slots on the same sides as the "V" mark on the piston. The piston pin holds the connecting rod in place.