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DESCRIPTION SPECIFICATION Valve Head Diameter Intake 48.387 to 48.641 mm (1.905 to 1.915 in.) Exhaust 37.973 to 38.227 mm (1.495 to 1.505 in.) Valve Face Angle Intake 46.5° Exhaust 46.5° Tip Refinishing (Max. Allowable) 0.25 mm (0.010 in.) VALVE SPRINGS Free Length (Approx.) 48 mm (1.890 in.) Spring Load Valve Closed 316 to 351 N @ 41.656 mm (71 to 79 lbf. @ 1.64 in.) Valve Open 898.6 to 969.7 N @ 30.89 mm (202 to 218 lbf @ 1.216 in.) Inside Diameter 21.0 mm to 21.51 mm (0.827 to 0.847 in.) Installed Height 41.656 mm (1.64 in.) PISTONS Weight (Less Pin) 417 to 429 grams (14.7 to 15.1 oz.) Piston Pin Bore 40.61 to 40.72 mm to Piston Top) (1.599 to 1.603 in.) Piston-to-Bore Clearance 0.018 to 0.038 mm (0.0008 to 0.0015 in.) Ring Gap Clearance Top Compression Ring 0.229 to 0.610 mm (0.0090 to 0.0240 in.) 2nd Compression Ring 0.483 to 0.965 mm (0.0190 to 0.0380 in.) Oil Control Steel Rails 0.254 to 1.500 mm (0.010 to 0.060 in.) Ring Side Clearance Compression Rings 0.042 to 0.084 mm (0.0017 to 0.0033 in.) Oil Control Rings 0.06 to 0.21 mm (0.0024 to 0.0083 in.) DESCRIPTION SPECIFICATION Piston Ring Groove Compression Rings 1.530 to 1.555 mm (0.0602 to 0.0612 in.) Oil Control Ring 4.035 to 4.060 mm (0.1589 to 0.1598 in.) Piston Ring Groove No.1 Compression Ring 88.39 to 88.65 mm (3.48 to 3.49 in.) No.2 Compression Ring 87.63 to 87.88 mm (3.45 to 3.46 in.) Oil Control Ring 89.66 to 89.92 mm (3.53 to 3.54 in.) Piston Pin Bore Diameter 23.650 to 23.658 mm (0.9312 to 0.9315 in.) Piston Pin Diameter 23.637 to 23.640 mm (0.9306 to 0.9307 in.) Piston-to-Pin Clearance 0.0102 to 0.0208 mm (0.0005 to 0.0009 in.) Piston-to-Pin Connecting 8.9 kN (2000 lbf.) OIL PUMP Gear-to-Body Clearance 0.051 to 0.102 mm (Radial) (0.002 to 0.004 in.) Gear-to-Body Clearance 0.051 mm (0.002 in.) Gear End Clearance 0.051 to 0.152 mm Plastigage (0.002 to 0.006 in.) Gear End Clearance 0.051 mm (0.002 in.) Gear End Clearance 0.1016 to 0.2032 mm Feeler Gauge (0.004 to 0.008 in.) Gear End Clearance 0.1778 mm (0.007 in.) Oil Pressure At Idle Speed 89.6 kPa (13 psi) At 1600 rpm & Higher 255 to 517 kPa (37 to 75 psi) Oil Pressure Relief 517 kPa (75 psi) 9 - 58 4.0L ENGINE WJ SPECIFICATIONS (Continued) |