ALTERNATOR 3218932 - Caterpillar

Illustration 1 g00295711
Piston And RingsNote: The word "Front" or an arrow which is marked on the piston crown must be toward the front of the engine. If the piston crown is not marked, put the narrowest side of the piston crater toward the side of the engine with the fuel injection pump. The shortest distance between the edge of the piston crater and the edge of the piston is the narrowest side of the piston crater.Note: Be sure that the ring end gaps of all the piston rings have 120 degrees spacing from each other.Note: Refer to Systems Operation, "General Information" for the location of the serial number. (1) Shape of groove in piston for top ring ... TaperShape of top ring ... TaperClearance between the ends of top ring in a cylinder liner without any wear ... 0.35 to 0.75 mm (0.014 to 0.030 inch) (2) Width of groove in piston for intermediate ring ... 2.56 to 2.58 mm (0.101 to 0.102 inch)Thickness of intermediate ring ... 2.48 to 2.49 mm (0.097 to 0.098 inch)Clearance between groove and intermediate ring ... 0.07 to 0.11 mm (0.003 to 0.004 inch)Clearance between the ends of an intermediate ring in a cylinder liner without any wear ... 0.30 to 0.76 mm (0.012 to 0.030 inch) (3) Width of groove in piston for oil control ring ... 4.040 to 4.060 mm (0.1591 to 0.1598 inch)Thickness of oil control ring ... 3.98 to 3.99 mm (0.156 to 0.157 inch)Clearance between groove and oil control ring ... 0.05 to 0.08 mm (0.002 to 0.003 inch)Clearance between the ends of an oil control ring in a cylinder liner without any wear ... 0.38 to 0.84 mm (0.015 to 0.033 inch) (4) Diameter of new piston pin ... 38.095 to 38.100 mm (1.4998 to 1.5000 inch)Bore in piston for pin ... 38.103 to 38.109 mm (1.5000 to 1.5004 inch)Piston height above cylinder block (not shown) ... 0.14 to 0.36 mm (0.005 to 0.014 inch)