WRENCH 6V9093 - Caterpillar

Illustration 1 g00888215
The cross section view of the piston and rings
Note: 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. (1) Top piston ring Clearance between the ends of the top piston ring in a cylinder liner without any wear ... 0.28 to 0.43 mm (0.011 to 0.017 inch)Note: Install the word "TOP" toward the top of the piston. New top rings have a red identification mark which must be on the left of the ring gap when the top ring is installed on an upright piston. (2) Intermediate ring Width of groove in piston for intermediate ring ... 2.562 to 2.580 mm (0.1009 to 0.1016 inch)Thickness of intermediate ring ... 2.471 to 2.490 mm (0.0972 to 0.0980 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 ... 0.300 to 0.550 mm (0.0118 to 0.0217 inch)Note: Install the word "TOP" toward the top of the piston. New intermediate rings have a green identification mark which must be on the left of the ring gap when the intermediate ring is installed on an upright piston. (3) Oil control ring Width of groove in piston for oil control ring ... 3.54 to 3.56 mm (0.139 to 0.140 inch)Thickness of oil control ring ... 3.47 to 3.49 mm (0.136 to 0.137 inch)Clearance between groove and oil control ring ... 0.05 to 0.09 mm (0.002 to 0.004 inch)Clearance between the ends of an oil control ring in a cylinder liner without any wear ... 0.300 to 0.550 mm (0.0118 to 0.0217 inch)Note: The rings should be positioned with the gaps of the rings approximately 120 degrees from each other.Note: A latch pin is used in order to hold both ends of the spring of the oil control ring in position. The ends of the spring of the oil control ring must be 180 degrees opposite the end gap of the oil control ring.Diameter of new piston pin ... 39.694 to 39.700 mm (1.5628 to 1.5630 inch)Bore in piston for piston pin ... 39.703 to 39.709 mm (1.5631 to 1.5633 inch)Piston height above cylinder block (not shown) ... 0.38 to 0.50 mm (0.015 to 0.020 inch)