30664 1 Mercury TILT TUBE

Illustration 1 g00595557
(1) Piston crownNote: The word "FRONT" is stamped on the piston crown (1) of one piece pistons. Install the piston with the word "FRONT" toward the front of the engine. The front of the engine is opposite the flywheel end. The part number on the connecting rod should be facing the rear of the engine. The rear of the engine is the flywheel end. Lubricate the entire piston prior to assembly into the cylinder block. Use clean engine oil.
Illustration 2 g00595622
Typical exampleTop Ring
(2) Top ringThe top ring is marked with "UP-1".Install the top ring with the side marked "UP-1" toward the top of the piston. The colored stripe faces to the right of the ring end gap.The ends of the piston ring have a clearance when the piston ring is installed in a cylinder with a specific bore size.Cylinder bore size ... 105.025 mm (4.1348 inch)Clearance ... 0.615 0.125 mm (0.0242 0.0049 inch)Increase in clearance between ends of piston ring for each 0.03 mm (0.001 inch) increase in cylinder bore size ... 0.09 mm (0.0035 inch)Intermediate Ring
(3) Intermediate ringThe intermediate ring is marked with "UP-2".Install the piston ring with the side marked "UP-2" toward the top of the piston. The colored stripe faces to the right of the ring end gap.The ends of the piston ring have a clearance when the piston ring is installed in a cylinder with a specific bore size.Cylinder bore size ... 105.025 mm (4.1348 inch)Clearance ... 0.918 0.125 mm (0.0361 0.0049 inch)Increase in clearance between ends of piston ring for each 0.03 mm (0.001 inch) increase in cylinder bore size ... 0.09 mm (0.0035 inch)Oil Control Ring
(4) Oil control ringThe oil control piston ring has a spring that is installed with the ring. The gap in the spring should be a distance of 180 degrees from the ring end gap when the oil control piston ring is assembled. The colored portion of the spring must be visible at the ring end gap.Width of oil control ring groove in new piston ... 4.041 0.013 mm (0.1591 0.0005 inch)Thickness of new oil control ring ... 3.982 0.008 mm (0.1568 0.0003 inch)Clearance between a new piston ring groove and a new piston ring ... 0.038 to 0.080 mm (0.0015 to 0.0031