1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 8Get this manual
ValveNalve SeatNalve Guides: Valve Clearance (cold) Intake Exhaust Valve Dimensions: Intake "A" Head Diameter Exhaust Intake "8" Face Width Exhaust Intake "C" Seat Width Exhaust Intake "0" Margin Thickness Exhaust Intake Stem Outside Diameter Exhaust Intake Guide Inside Diameter Exhaust Intake Stem To Guide Clearance Exhaust Stem Run-out Limit (max
0.00790.0059 in(0.150.20 mm) 0.00980.0079 in (0.200.25 mm) 1.0201.028 in(25.922.1 mm) 0.8620.870 in(21.922.1 mm) 0.0790.124 in(2.003.14 mm) 0.0790.124 in(2.003.14 mm) 0.0240.031 in (0.60.8 mm) 0.0240.031 in(0.60.8 mm) 0.0200.035 in(0.50.9 mm) 0.0200.035 in(0.50.9 mm) 0.21560.2161 in(5.4755.490 mm) 0.21500.2156 in(5.4605.475 mm) 0.21650.2170 in(5.5005.512 mm) 0.21650.2170 in (5.5005.512 mm) 0.00040.0015 in(0.0100.037 mm) 0.00100.0020 in(0.0250.052 mm) 0.0006 in(0.016 mm)