Backlash; Measuring The Forward And Reverse Gear Backlash - Yamaha E40G Service Manual

LOWR

Backlash

Measuring the forward and reverse
gear backlash
1. Remove the water pump assembly.
2. Set the lower unit upside down.
3. Remove the lower case cap, propeller
shaft assembly from the lower unit.
4. Remove the O-ring, and then install the
propeller shaft assembly onto the lower
unit.
5. Set the gear shift to the neutral position
at the lower unit.
6. Install the dial gauge onto the lower unit
and set the dial gauge.
NOTE:
Set the dial gauge plunger vertical position
from the center of gear teeth.
6-25
Lower unit
6F660890
1
2
6F660900
Dial gauge set 1: 90890-01252
Magneto base B 2: 90890-06844
7. Hold the drive shaft and slowly turn the
forward gear clockwise and counter-
clockwise, then measure the backlash
when the gear stops in each direction.
Forward gear backlash:
0.05– 0.24mm (0.0020– 0.0094 in)
8. Adjust the shim(s) to specified thickness
(Add or remove).
Available shim thicknesses:
0.70, 0.80, 0.90, 1.00, and
1.10, 1.20 mm
9. Hold the drive shaft and slowly turn the
reverse gear clockwise and counter-
clockwise, then measure the backlash
when the gear stops in each direction.
Reverse gear backlash:
0.40– 0.59mm (0.0157– 0.0232 in)
6F660920
6F65G11