Lower Unit Technical Data; Lower Unit Assembly - Yamaha F4B Service Manual

SPEC
Item
Connecting rod
Small end inside diameter
Big end inside diameter
Oil clearance
Crankshaft
Runout
Journal diameter (cylinder
block side)
Journal diameter (crankcase
side)
Crankpin diameter
Crankpin width
Valve lifter
Outside diameter
(*1) The figures are for reference only.

Lower unit technical data

Lower unit assembly

Item
Lower unit
Holding pressure
Propeller shaft
Runout
Drive shaft
Runout
1-9
Specification
Unit
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Unit
kPa (kgf/
2
cm
mm (in)
mm (in)
F4BMH
15.015–15.029 (0.5911–0.5917)
28.000–28.015 (1.1024–1.1030)
0.016–0.046 (0.0006–0.0018)
24.980–24.993 (0.9835–0.9840)
24.982–24.994 (0.9835–0.9840)
27.969–27.984 (1.1011–1.1017)
21.000–21.100 (0.8268–0.8307)
7.965–7.980 (0.3136–0.3142)
F4BMH
, psi)
Model
F5AMH
0.020 (0.0008)
Model
F5AMH
98.0 (0.98, 14.2)
0.02 (0.001)
0.4 (0.02)
F6CMH
F6CMH