Measuring The Forward Gear Backlash - Yamaha F150B Service Manual

Measuring the forward gear backlash

• Spray anti-rust lubricant on the gear and
bearings before installation. Do not apply
gear oil to the parts. Otherwise, correct
measurements cannot be obtained.
• Keep the parts free of foreign material,
such as dirt and lint.
• When measuring the forward gear or
reverse gear backlash, use the original
bearings and shims.
• 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.
1. Install the original shim(s) (T1).
TIP:
• If the original shim(s) (T1) are missing,
install new shims with a combined thick-
ness of 0.55 mm.
• Do not reuse a shim if it is any deformed or
scratched.
2. Install the taper roller bearing outer race.
See "Assembling the lower case" (8-17)
step 2 and step 3.
3. Install the forward gear assembly into the
lower case.
4. Install the drive shaft, thrust bearing a,
and shim(s) (T3) b.
b
a
Shimming (regular rotation model)
TIP:
Turn the drive shaft 10 times or more to seat
the thrust bearing.
5. Install the pinion
temporarily.
TIP:
When installing the pinion, lift up the drive
shaft slightly and align the pinion and shaft
splines.
6. Install a new O-ring c to the drive shaft
housing d, and then install the drive
shaft housing d.
a
d
c
TIP:
Install the drive shaft housing with the cutout
a in the housing facing forward.
7. Tighten the pinion nut to the specified
torque.
f
f
Drive shaft holder 6 e: 90890-06520
Pinion nut holder f: 90890-06715
and pinion nut
e
10
8-38
0
1
2
3
4
5
6
7
8
9
A