Description 6.2 Liter (377 cid)
Surface flatness
At exhaust manifold deck 0.05 mm (0.0020 in.)
At engine block deck with
an 150 mm (5.90 in.) area
0.05 mm (0.0020 in.)
At intake manifold deck 0.10 mm (0.0039 in.)
Intake manifold flatness 0.10 mm (0.0039 in.)
7. If a measured value is greater than specified, the cylinder head must be repaired to specifications or replaced.
Valve
1. Inspect the valves for burned heads, cracked or pitted faces, or damaged stems.
a - Cracked and pitted face
b - Damaged stem
IMPORTANT: Excessive valve stem to bore clearance will cause excessive oil consumption and possibly broken valves.
Insufficient clearance will result in noisy, binding valves.
2. Measure the valve stem diameter in three places.
3. If the measured value is less than the specified limit, the valve must be replaced.
Description 6.2 Liter (377 cid)
Production stem diameter
Intake 7.96 mm (0.3133 in.)
Exhaust 7.97 mm (0.3137 in.)
4. Measure the valve head margin.
5. If the measured value is less than specified, the valve must be replaced.
Engine Inspection and Assembly
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 3B-45
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