NOTE: Several different types of equipment are available for reconditioning valves. The manufacturer's recommendation
should be carefully followed to attain proper results. Valves that do not meet specifications should be replaced.
Exhaust Intake
a - Margin
b - Face angle
Description 6.2 Liter (377 cid)
Face angle
Intake 45°
Exhaust 45°
Margin after surfacing Intake 0.79 mm (0.0311 in.) minimum
Valve Seat
IMPORTANT: Regardless of the type of equipment, it is essential that the valve guide bores be free from carbon or dirt to
achieve proper centering of the pilot in the valve guide, ensuring concentricity when reconditioning the valve seats.
NOTE: Several different types of equipment are available for reconditioning valve seats. Equipment manufacturer's
recommendations should be followed to attain proper results.
1. Recondition the valve seats if pitted or worn.
Typical 3 angle valve seat
a - Top correction cut angle
b - Seat angle
c - Bottom correction cut angle
d - Seat width
Engine Inspection and Assembly
Page 3B-48 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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