1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 113Get this manual
Specifications Valves ValveNalve SeatNalve Guides: Valve Clearance (cold) Intake Exhaust Valve Dimensions: "A" Head Diameter Intake Exhaust "B" Face Width Intake Exhaust "C" Seat Width Intake Exhaust "D" Margin Thickness Intake Exhaust Stem Outside Diameter Intake Exhaust Guide Inside Diameter Intake Exhaust Stem To Guide Clearance Intake Exhaust Stem Run-out Limit (max
0.0060.010 in(0.150.25 mm) 0.0100.014 in( 0.250.35 mm) 1.177 -1.185 in(29.930.1 mm) 1.0201.027 in(25.926.1 mm) 0.0910.106 in(2.32.7 mm) 0.0990.114 in(2.52.7 mm) 0.0360.043 in(0.91.1 mm) 0.0360.043 in(0.91.1 mm) 0.0240.039 in(0.61.0 mm) 0.0280.043 in(0.71.1 mm) 0.21560.2161 in(5.4755.490 mm) 0.2150.02156 in(5.4605.475 mm) 0.2165 -0.2170 in(5.5005.512 mm) 0.2165 -0.2170 in (5.5005.512 mm) 0.00040.0015 in(0.0100.037 mm) 0.00100.0020 in(0.0250.052 mm) 0.001 in(0.03 mm)