Checking The Oil Strainer; Checking The Oil Seal Housing; Installing The Crankcase - Yamaha F4B Service Manual

POWR
Outer rotor diameter a:
22.980–23.000 mm
(0.9047–0.9055 in)
Outer rotor height b:
9.950–9.980 mm (0.3917–0.3929 in)
Inner rotor height c:
9.950–9.980 mm (0.3917–0.3929 in)

Checking the oil strainer

1. Check the oil strainer. Clean if there is
dirt or residue.

Checking the oil seal housing

1. Check the oil seal housing. Replace if
cracked or damaged.

Installing the crankcase

Do not reuse a gasket, always replace it
with a new one.
1. Install the dowels a and a new gasket
b.
2. Install the crankcase c, and then tighten
the crankcase bolts d to the specified
torques in 2 stages and in the order a,
b, and so on.
d
7-25
Power unit
c
a
b
e
d
c
b
Crankcase bolt d:
1st: 5 N·m (0.5 kgf·m, 3.7 ft·lb)
2nd: 11 N·m (1.1 kgf·m, 8.1 ft·lb)
3. Install a new gasket e, and then tighten
the blind plug f to the specified torque.
Blind plug f:
20 N·m (2.0 kgf·m, 14.8 ft·lb)
4. Install the cooling water hose g.
g
g
f
a
h
i
j
e
f
d