Mercury 40 FourStroke - Page 8

SPECIFICATIONS
Page 1A-4 90-857046R1 NOVEMBER 2001
COMPRESSION
RATIO
Compression Ratio
Cylinder Compression*
(Electric Models Only, Cold Engine @
W.O.T.)
9.7:1
180 - 210 psi (Peak)
PISTON PIN Piston Pin Diameter 0.6285 - 0.6287 in. (15.965 - 15.970 mm)
CONNECTING
ROD
Oil Clearance (Big End)
Small End Inside Diameter
0.0008 - 0.0020 in. (0.020 - 0.052 mm)
0.6293 - 0.6298 in. (15.985 - 15.998 mm)
CRANKSHAFT
Main Bearing Clearance
Crankshaft Run-out
0.0005 - 0.0017 in. (0.012 - 0.044 mm)
0.0018 in. (0.046 mm)
CAMSHAFT
Camshaft Dimensions
Intake “A”
Exhaust “A”
Intake “B”
Exhaust “B”
Run-out Limit
Camshaft Bearing Diameter “b”
A
B
b
b
b
b
1.214 - 1.222 in. (30.83 - 31.03 mm)
1.214 - 1.222 in. (30.83 - 31.03 mm)
1.020 - 1.028 in. (25.90 - 26.10 mm)
1.020 - 1.028 in. (25.90 - 26.10 mm)
0.0039 in. (0.1 mm)
1.4541 - 1.4549 in.
(36.935 - 36.955 mm)
VALVE SPRING
Free Length “a”
Tilt Limit “b”
Compressed Pressure (Installed)
Intake
Exhaust
Tilt Limit (Intake & Exhaust)
Dir. of Winding (Intake & Exhaust)
a
b
a
b
1.491-1.569 in. (37.85-39.85 mm)
Less than 0.060 in. (1.7 mm)
19.8 - 22.0 lbs. (9.0 - 10.0 kg)
19.8 - 22.0 lbs. (9.0 - 10.0 kg)
0.043 in. (1.1 mm)
Left Hand