Mercury MERCRUISER - Page 207

Lifter
Description 6.2 Liter (377 cid)
Type Hydraulic roller
Rocker arm ratio 1.70:1
Valve lift
Intake 12.11 mm (0.4767 in.)
Exhaust 12.06 mm (0.4780 in.)
Head and Stem
Description 6.2 Liter (377 cid)
Valve diameter
Intake 50.8 mm (2.0 in.)
Exhaust 39.4 mm (1.55 in.)
Face angle
Intake 45°
Exhaust 45°
Margin after surfacing Intake 0.79 mm (0.0311 in.) minimum
Production stem diameter
Intake 7.96 mm (0.3133 in.)
Exhaust 7.97 mm (0.3137 in.)
Valve stem oil seal
Installed height
NOTE: Measured from the
top of the valve guide bevel
to the bottom of the oil stem
seal.
0 mm (0 in.)
Stem Clearance
Description 6.2 Liter (377 cid)
Production
Intake 0.023–0.065 mm (0.0009–0.0025 in.)
Exhaust 0.033–0.075 mm (0.0012–0.00295 in.)
Seat
Description 6.2 Liter (377 cid)
Seat angle
Intake and exhaust
46°
Top correction cut angle 30°
Bottom correction cut angle 60°
Width
Intake 1.016–1.651 mm (0.040–0.065 in.)
Exhaust 1.65–2.489 mm (0.065–0.098 in.)
Runout Intake and exhaust 0.05 mm (0.002 in.) maximum
Spring
Description 6.2 Liter (377 cid)
Free length 53.39 mm (2.10 in.)
Load
Valve closed 350 N (78.68 lb) at 46.19 mm (1.818 in.)
Valve open 1084 N (243.69 lb) at 32.3 mm (1.2717 in.)
Installed height
Intake
46.19 mm (1.818 in.)
Exhaust
Approximate number of coils 6
Engine Inspection and Assembly
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 3B-5