Mercury 40 FourStroke - Page 246

CYLINDER HEAD
90-857046R1 NOVEMBER 2001 Page 4A-29
3. Measure the cam lobe length (a) and width (b).
a
b
Cam Lobe Specifications
a
Intake 1.214 - 1.222 in.
(30.83 - 31.03 mm)
Exhaust 1.214 - 1.222 in.
(30.83 - 31.03 mm)
b
Intake 1.020 - 1.028 in.
(25.90 -26.10 mm)
Exhaust 1.020 - 1.028 in.
(25.90 -26.10 mm)
4. Measure the camshaft bore diameters (a) and camshaft bearing diameters (b).
a
b
b
b
b
Camshaft Bore Inside Diameter “a”
1.4567 - 1.4577 in. (37.000 - 37.025 mm)
Camshaft Bearing Inside Diameter “b”
1.4541 - 1.4549 in. (36.935 - 36.955 mm)