Yamaha F40B - Maintenance Specification

SPEC
Specification
2-7 67C3K11
Maintenance specification
Power unit
Item Unit
Model
F30AMHD F40BMHD F40BWHD F40BED
Power unit
Minimum compression
pressure
(*1)
kPa
(kgf/cm
2
, psi)
600 (6.0, 87.0) 380 (8.3, 120.4)
Oil pressure
(*2)
kPa
(kgf/cm
2
, psi)
210 (2.1, 30.5) at 52 °C (126 °F) with SL
10W-30 engine oil and at engine idle speed
Cylinder head
Warpage limit mm (in) 0.10 (0.0039)
(lines indicate straightedge
position)
Cylinder head journal inside
diameter (A)
mm (in) 37.000–37.025 (1.4567–1.4577)
Camshaft
Intake and
exhaust (A)
mm (in) 30.834–31.034 (1.2139–1.2218)
Intake and
exhaust (B)
mm (in) 25.900–26.100 (1.0197–1.0276)
Camshaft journal diameter (C) mm (in) 36.925–36.945 (1.4537–1.4545)
Camshaft journal diameter (D) mm (in) 36.935–36.955 (1.4541–1.4549)
Camshaft runout limit mm (in) 0.03 (0.0012)
(*1)
Measuring conditions:
Ambient temperature 20 °C (68 °F), wide open throttle, with spark plugs removed from all cylinders.
Since this outboard motor is equipped with an automatic decompression mechanism, the compression
pressure may vary depending on the speed at which the starter handle is pulled when using the manual
starter to crank the engine. (M and W model)
The figures are for reference only.
(*2)
For details of the checking method, see “Checking the oil pressure” (5-1).
The figures are for reference only.
A
A
A
C
D
D