GEAR - SUN (27 TEETH) 7Y0234 - Caterpillar

Illustration 1 g01363510
Typical example
(1) Top compression ringNaturally AspiratedThe shape of the top compression ring ... Rectangular with a barrel faceWidth of the top compression ring ... 2.47 to 2.49 mm (0.0972 to 0.0980 inch)Clearance between the top compression ring and the piston groove ... 0.09 to 0.13 mm (0.0035 to 0.0051 inch)Ring gap ... 0.30 to 0.55 mm (0.0118 to 0.0217 inch)TurbochargedThe shape of the top compression ring ... Keystone with a barrel faceWidth of the top compression ring ... taperedRing gap ... 0.30 to 0.45 mm (0.0118 to 0.0177 inch)Note: When you install a new top compression ring, make sure that the word "TOP" is facing the top of the piston. New top piston rings for naturally aspirated engines have a red identification mark which must be on the left of the ring end gap when the top piston ring is installed on an upright piston. New top piston rings for turbocharged engines have a yellow identification mark which must be on the left of the ring end gap when the top piston ring is installed on an upright piston. (2) Intermediate compression ringThe shape of the intermediate compression ring ... Internal chamfer in the bottom edge with a tapered faceWidth of intermediate compression ring for naturally aspirated engines ... 2.47 to 2.49 mm (0.097 to 0.098 inch)Width of intermediate compression ring for turbocharged engines ... 2.470 to 2.495 mm (0.0972 to 0.0982 inch)Clearance between the intermediate compression ring and the piston groove for naturally aspirated engines ... 0.05 to 0.09 mm (0.002 to 0.003 inch)Clearance between the intermediate compression ring and the piston groove for turbocharged engines ... 0.065 to 0.110 mm (0.0026 to 0.0043 inch)Ring gap for naturally aspirated engines ... 0.70 to 0.95 mm (0.0275 to 0.0374 inch)Ring gap for turbocharged engines ... 0.75 to 1.25 mm (0.0295 to 0.0492 inch)Note: When you install a new intermediate compression ring, make sure that the word "TOP" is facing the top of the piston. New intermediate rings for naturally aspirated engines have a green identification mark which must be on the left of the ring end gap when the top piston ring is installed on an upright piston. New intermediate rings for turbocharged engines have a blue identification mark which must be on the left of the ring end gap when the top piston ring is installed on an upright piston. (3) Oil control ringShape of oil control ring ... a two-piece coil that is spring loadedWidth of oil control ring for naturally aspirated engines ... 3.47 to 3.49 mm (0.1366 to 0.1374 inch)Width of oil control ring for turbocharged engines ... 2.97 to 2.99 mm (0.1169 to 0.1177 inch)Clearance between the oil control ring and the groove in the piston for naturally aspirated engines ... 0.03 to 0.07 mm (0.0011 to 0.0027 inch)Ring gap ... 0.30 to 0.55 mm (0.0118 to 0.0216 inch)Note: A pin is used in order to hold both ends of