Yamaha F225F, Service Manual

Page: 404 / 576

8-25
LOWR
Lower unit
Disassembling the lower case
• Use heat-resistant gloves. Otherwise,
burns could result.
• To prevent fires, remove any flammable
substances, such as gasoline and oil,
around the working area.
• Keep good ventilation while working.
1. Heat the installation area of the needle
bearing in the lower case using a gas
torch.
NOTICE: When heating the
lower case, heat the entire installation
area evenly. Otherwise, the paint on
the lower case could be burned.
2. Remove the needle bearing
a
.
TIP:
• Before removing the needle bearing, make
sure to remove the forward gear assembly.
• Before installing the special service tool,
make sure that the rollers are installed in
the needle bearing outer race.
Checking the pinion
1. Check the teeth of the pinion. Replace if
cracked or worn.
Checking the forward gear
1. Check the teeth and dogs of the forward
gear. Replace if cracked or worn.
Checking the drive shaft
1. Check the drive shaft. Replace if dam-
aged or worn.
2. Measure the drive shaft runout.
Checking the lower case
1. Check the lower case. Replace if cracked
or damaged.
Assembling the drive shaft
Do not reuse a bearing, always replace it
with a new one.
1. Install a new taper roller bearing
a
.
NOTICE: Do not press the threads
b
of the drive shaft directly. Make sure
that the special service tool
a
and
blocks
b
do not contact the threads
c
of the drive shaft.
Driver rod L3
b
: 90890-06652
Needle bearing attachment
c
:
90890-06680
a
c
b
c
a
b
Drive shaft runout: 1.0 mm (0.0394 in)