KIT-GASKET 4553259 - Caterpillar

Naturally Aspirated Engines
Illustration 1 g00295713
Typical exampleNote: An arrow or "Front" which is marked on the piston crown must be toward the front of the engine. (1) Top piston ring Width of groove in piston for top ring ... 2.57 to 2.59 mm (0.101 to 0.102 inch) Thickness of top ring ... 2.48 to 2.49 mm (0.097 to 0.098 inch) Clearance between groove and top ring ... 0.08 to 0.11 mm (0.003 to 0.004 inch) Gap of top ring (early engines) ... 0.40 to 0.85 mm (0.016 to 0.033 inch) Gap of top ring (later engines) ... 0.28 to 0.63 mm (0.011 to 0.025 inch)Note: Install the word "Top" toward the top of the piston. New top rings have a red or a blue identification mark which must be on the left of the ring