Yamaha F150B, Service Manual

Page: 296 / 458

8-17
LOWR
Lower unit
2. Remove the needle bearing
a
.
TIP:
Make sure to remove the forward gear before
removing the needle bearing.
3. Heat the installation area of the taper
roller bearing outer race in the lower case
with a gas torch, and then remove the
outer race
d
and shim(s) (T1)
e
.
NOTICE: When heating the lower
case, heat the entire installation area
evenly. Otherwise, the paint on the
lower case could be burned.
TIP:
• Before removing the taper roller bearing
outer race
d
, place some cushioning mate-
rial below the lower case to catch the outer
race when it falls out.
• If the taper roller bearing outer race does
not come out, lightly tap the lower unit tor-
pedo with a plastic hammer.
Checking the pinion and forward
gear
1. Check the pinion and 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. Replace
if above specification.
Checking the lower case
1. Check the lower case. Replace if cracked
or damaged.
Assembling the lower case
• Use heat-resistant gloves, otherwise
burns could result.
• Remove any flammable substances,
such as gasoline and oil, around the
working area to avoid the risk of fire.
• Heat the lower case in a well-ventilated
area.
Do not reuse the bearing, always replace
it with a new one.
1. Install the original shim(s) (T1)
a
.
Ball bearing attachment
b
: 90890-06636
Driver rod LL
c
: 90890-06605
a
b
c
b
c
a
d
e
Drive shaft runout limit:
0.2 mm (0.008 in)