Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 9Get this manual
SPECIFICATIONS
ValveNalve SeatValve Guides: Valve Clearance (cold) Intake Exhaust Valve Dimensions: "A" Head Diameter Intake Exhaust "8" Face Width Intake Exhaust "CSeat Width Intake Exhaust "0" Margin Thickness Intake Exhaust Stem Outside Diameter Intake Exhaust Guide Inside Diameter Intake Exhaust Stem To Guide Clearance Intake Exhaust Stem Limit (max
0.0060.010 in(0.150.25 mm) 0.0100.014 in(0.250.35 mm) 1.2561.264 in(31.932.1 mm) 1.0201.028 in(25.926.1 mm) 0.0790.124 in(2.003.14 mm) 0.0790.124 in(2.003.14 mm) 0.0350.043 in(0.91.1 mm) 0.0350.043 in(0.91.1 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(5.5005.51 mm) 0.21650.2170 in(5.5005.51 mm) 0.00040.0015 in(0.0100.037 mm) 0.00100.0020 in(0.0250.052 mm) 0.0006 in(0.016 mm)