Maintenance Specification; Power Unit - Yamaha F30A Service Manual

SPEC

Maintenance specification

Power unit

Item
Power unit
Minimum compression
(*1)
pressure
(*2)
Oil pressure
Cylinder head
Warpage limit
(lines indicate straightedge
position)
Cylinder head journal inside
diameter (A)
A
A
A
Camshaft
Intake and
exhaust (A)
Intake and
exhaust (B)
Camshaft journal diameter (C)
Camshaft journal diameter (D)
D
Camshaft runout limit
(*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.
2-7
Specification
Unit
kPa
(kgf/cm
kPa
(kgf/cm
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
C
D
mm (in)
F30AMHD F40BMHD F40BWHD
600 (6.0, 87.0)
2
, psi)
210 (2.1, 30.5) at 52 °C (126 °F) with SL
2
, psi) 10W-30 engine oil and at engine idle speed
37.000–37.025 (1.4567–1.4577)
30.834–31.034 (1.2139–1.2218)
25.900–26.100 (1.0197–1.0276)
36.925–36.945 (1.4537–1.4545)
36.935–36.955 (1.4541–1.4549)
Model
380 (8.3, 120.4)
0.10 (0.0039)
0.03 (0.0012)
F40BED
67C3K11