Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 111Get this manual
Specifications VALVES ValveValve SeatValve 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 Runout Limit (max 0.00590.0079 in(0.150.20 mm) 0.00790.0098 in(0.200.25 mm) 1.0201.028 in(25.926.1 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)