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DESCRIPTION SPECIFICATION PISTON PIN Clearance in Piston 0.00635 – 0.01905 mm (0.00025 – 0.00075 in.) Diameter 24.996 – 25.001 mm (0.9841 – 0.9843 in.) End Play NONE Length 75.946 – 76.454 mm (2.990 – 3.010 in.) PISTON RINGS Ring Gap Compression Rings 0.254 – 0.508 mm (0.010 – 0.020 in.) Oil Control (Steel Rails) 0.254 – 1.270 mm (0.010 – 0.050 in.) Ring Side Clearance Compression Rings 0.038 – 0.076 mm (0.0015 – 0.0030 in.) Oil Ring (Steel Rails) 0.06 – 0.21 mm (0.002 – 0.008 in.) Ring Width Compression rings 1.971 – 1.989 mm (0.0776 – 0.0783 in.) Oil Ring (Steel Rails) – Max. 3.848 – 3.975 mm (0.1515 – 0.1565 in.) VALVE TIMING Exhaust Valve Closes (ATDC) 21° Opens (BBDC) 60° Duration 264° Intake Valve Closes (ATDC) 61° Opens (BBDC) 10° Duration 250° Valve Overlap 31° OVERSIZE AND UNDERSIZE ENGINE COMPONENT MARKINGS CHART U/S-O/S Item Identification Identification Location U/S Rod/ R or M R-1-4 ect. Milled flat on No.8 .0254 mm Main (indicating No. 1 crankshaft (0.001 in.) Journal and 4 connecting counterweight. rod journal) and/or M-2-3 ect. (indicating No. 2 and 3 main bearing O/S Hydraulic L Diamond- shaped .2032 mm Tappets stamp top pad - (.008 in.) front of engine and flat ground on outside surface of each O/S tappet bore. O/S Valve X Milled pad .127 mm Stems adjacent to two (.005 in.) tapped holes (3/8 in.) on each end of cylinder head. 9a - 66 ENGINE 5.2L INTERNATIONAL R1 ENGINE 5.2L INTERNATIONAL (Continued) |