1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 7Get this manual
Engine Maintenance Specifications CYLINDER BLOCK Type Displacement Number of Cylinders Piston Stroke Compression Ratio Cylinder Compression (cold engine W.O.T Diameter (Std) (Oversize) 0.020 in(0.050 mm) TaperOut of Round Maximum Bore Type Piston Type 0.0at Skirt (Standard) (Oversize) 0.020 in(0.50mm) Piston to Cylinder Clearance Piston Pin Diameter Oil Clearance (Big End) Small End Inside Diameter Main Bearing Clearance Crankshaft Run-out Ring End Gap (Installed) Top Middle Bottom (Oil Ring) Side Clearance: Top Middle Camshaft Dimensions Intake "A" Exhaust "A" Intake "B" Exhaust "B" Run-out Limit
4 Stoke CycleOver Head Camshaft 57 cuin(935cc) 2.953 in(75 mm) 9.3:1 170 -190 Ibsin2 (Peak) 2.4803 in(63.0mm) 2.5003 in(63.5 mm) 0.003 in(0.08 mm) Steel Aluminum 2.4783- 2.4789 in(62.95062.965 mm) 2.49832.4989 in(63,45063.465 mm) 0.0014.0026 in(0.0350.065 mm) 0.62850.6287 in(15.96515.970 mm) 0.0008 -0.0020 in(0.020 -0.052 mm) 0.62930.6298 in(15.98515.998 mm) 0.00050.0017 in(0.0120.044 mm) 0.0012 in(0.03 mm) 0.0060.012 in(0.150.03 mm) 0.0120.020 in(0.300.50 mm) 0.0080.028 in(0.200.70 mm) 0.0020.003 in(0.040.08 mm) 0.0010.003 in(0.030.07 mm)