Yamaha E40J - Backlash; Measuring the Forward and Reverse Gear Backlash

LOWR
6-25
6F65G11
Lower unit
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.
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.
8. Adjust the shim(s) to specified thickness
(Add or remove).
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.
6F660890
6F660920
1
2
6F660900
Dial gauge set 1: 90890-01252
Magneto base B 2: 90890-06844
Forward gear backlash:
0.05– 0.24mm (
0.0020– 0.0094
in)
Reverse gear backlash:
0.40– 0.59mm (
0.0157– 0.0232 in)
Available shim thicknesses:
0.70, 0.80, 0.90, 1.00, and
1.10, 1.20 mm