21661430 Volvo.Penta Aquamatic drive, complete

Illustration 1 g00845975 (1) The chamber that is on the top of the piston must face the right side of the engine. (2) The Shibaura name that is on the inside of the piston must align with the stamped number on the connecting rod. Piston and Piston Rings
Illustration 2 g00845969Use a feeler gauge to measure the clearance between the piston ring groove and the piston ring. If the clearance is greater than the service limit, use a new piston ring and check the clearance.If the clearance is within the service limit, renew the piston rings. If the clearance is outside of the service limit, renew the piston. (1) Top piston ring Shape of top ring (A) Naturally aspirated ... Barrel faceTurbocharged ... KeystoneC0.5 and C0.7 Clearance between piston ring groove and top piston ring ... 0.06 to 0.10 mm (0.0024 to 0.0039 inch)Service limit for clearance of top piston ring ... 0.25 mm (0.0098 inch)Gap of top piston ring ... 0.13 to 0.25 mm (0.0051 to 0.0098 inch)Service limit for gap of top piston ring ... 1.0 mm (0.039 inch)C1.1/3011C and C1.6 Clearance between piston ring groove and top piston ring ... 0.06 to 0.10 mm (0.0024 to 0.0039 inch)Service limit for clearance of top piston ring ... 0.25 mm (0.0098 inch)Gap of top piston ring ... 0.15 to 0.27 mm (0.0059 to 0.0106 inch)Service limit for gap of top piston ring ... 1.0 mm (0.039 inch)C1.5/3013C and C2.2/3024C Clearance between piston ring groove and top piston ring ... 0.07 to 0.11 mm (0.0028 to 0.0043 inch)Service limit for clearance of top piston ring ... 0.25 mm (0.0098 inch)Gap of top piston ring ... 0.20 to 0.35 mm (0.0079 to 0.0138 inch)Service limit for gap of top piston ring ... 1.0 mm (0.039 inch)Note: It is difficult to measure the wear of the top piston ring on the C2.2/3024CT engine. When either the intermediate ring or the oil control ring is outside the service limit, renew all of the rings.Note: Install the word "Top" toward the top of the piston. New top piston rings have a red identification mark which must be on the left of the ring gap when the top piston ring is installed on an upright piston.Note: New top piston rings for the C2.2/3024CT have a yellow identification mark which must be on the left of the ring gap when the top piston ring is installed on an upright piston.Note: The top surface of the piston ring should be equally distant from the top face of the cylinder block at all points before the piston ring end gap is measured with a feeler gauge. (2) Intermediate ring Shape of intermediate ring (B) ... TaperC0.5 and C0.7 Clearance between piston ring groove and intermediate ring ... 0.05 to 0.09 mm (0.0020 to 0.0035 inch)Service limit for clearance of intermediate ring ... 0.25 mm (0.0098 inch)Gap of intermediate ring ... 0.10 to 0.22 mm (0.0039 to 0.0087 inch)Service limit for gap of intermediate ring ... 1.0 mm (0.039 inch)C1.1/3011C and C1.6 Clearance between piston ring groove and intermediate ring ... 0.05 to 0.09 mm (0.0020 to 0.0035 inch)Service limit for clearance of intermediate ring ... 0.25 mm (0.0098 inch)Gap of intermediate ring ... 0.12 to 0.24 mm (0.0047 to 0.0094 inch)Service limit for gap of intermediate ring ... 1.0 mm (0.039 inch)C1.5/3013C, C2.2/3024C and C2.2/3024CT Clearance between piston ring groove and intermediate ring ... 0.04 to 0.08 mm (0.0016 to