Product Manual

Parameter Specification
Connecting rod wrist pin bore diameter 16.010–16.021 mm (0.6303–0.6307 in.)
Connecting rod wrist pin bore diameter (service limit) 16.025 mm (0.6309 in.)
Connecting rod crankshaft pin diameter 29.000–29.013 mm (1.1417–1.1422 in.)
Connecting rod crankshaft pin diameter (service limit) 28.038 mm (1.1432 in.)
Connecting rod side clearance 0.1–0.25 mm (0.004–0.01 in.)
Connecting rod side clearance (service limit) 0.6 mm (0.0236 in.)
Piston Specifications
Parameter Specification
Piston skirt standard diameter 60.96 mm (2.40 in.)
Piston skirt standard diameter (service limit) 60.90 mm (2.3976 in.)
Piston to bore clearance 0.020–0.055 mm (0.0008–0.0022 in.)
Wrist pin diameter 15.996–16.000 mm (0.6298–0.6299 in.)
Wrist pin diameter (service limit) 15.993 mm (0.6296 in.)
Top ring side clearance 0.03–0.08 mm (0.0012–0.0031 in.)
Top ring side clearance (service limit) 0.1 mm (0.004 in.)
Second ring side clearance 0.02–0.06 mm (0.0008–0.0024 in.)
Second ring side clearance (service limit) 0.09 mm (0.0035 in.)
Oil ring side clearance 0.03–0.13 mm (0.0012–0.0051 in.)
Oil ring side clearance (service limit) 0.15 mm (0.0059 in.)
Top ring end gap 0.15–0.30 mm (0.0059–0.0118 in.)
Top ring end gap (service limit) 0.5 mm (0.02 in.)
Second ring end gap 0.35–0.50 mm (0.0138–0.0197 in.)
Second ring end gap (service limit) 0.7 mm (0.028 in.)
Oil ring end gap 0.2–0.7 mm (0.008–0.028 in.)
Cylinder Head Specifications
Parameter Specification
Maximum deck warp 0.1 mm (0.004 in.)
Number of valves 4
Number of valves per cylinder 2
Number of camshafts 1
Camshaft journal outside diameter
Pulley side 17.98 mm (0.708 in.)
Pulley side (service limit) 17.95 mm (0.707 in.)
Oil pump side 15.97 mm (0.629 in.)
Oil pump side (service limit) 15.95 mm (0.628 in.)
Cam lobe height
Intake 23.63 mm (0.9303 in.)
Exhaust 23.80 mm (0.9370 in.)
Intake and exhaust (service limit) 23.50 mm (0.9252 in.)
Valve clearance
Intake 0.13–0.17 mm (0.005–0.007 in.)
Exhaust 0.18–0.22 mm (0.007–0.008 in.)
Valve seat angles 30°, 45°, 60°
Valve spring free length 32.85 mm (1.293 in.)
Valve spring free length (service limit) 31.50 mm (1.240 in.)
Valve spring tilt limit 1.1 mm (0.043 in.)
Specifications
Page 1A-4 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017