Backlash; Measuring The Forward And Reverse Gear Backlash - Yamaha E115A Service Manual

NOTE:
9 Without the O-ring, when measuring the
reverse gear height.
9 Select the shim thickness (T2) by using the
specified measurement(s) and the calcula-
tion formula.
9 Measure the reverse gear at 4 points to find
the height average.
9 Make of note the each measurement
numerical.
Shimming plate 1: 90890-06701
Digital caliper 2: 90890-06704
3. Calculate the reverse gear shim thick-
ness (T2) as shown in the examples
below.
NOTE:
"R" is the deviation of the lower case dimen-
sion from standard. The "R" mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the "R"
mark a is unreadable, assume that "R" is
zero and check the backlash when the unit is
assembled.
Calculation formula:
Reverse gear shim thickness (T2) =
M2 – 27.4 – R/100
Example:
If "M2" is 28.25 mm and "R" is (– 1), then
T2 = 28.25 – 27.4 – (– 1)/100 mm
= 28.25 – 27.4 + 0.01 mm
= 1.36 mm
61U5H11
4. Select the reverse gear shim(s) (T2) as
follows.
Calculated numeral
at 1/100th place
1, 2
3, 4, 5
6, 7, 8
9, 10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
Example:
If "T2" is 1.30 mm, then the reverse gear shim
is 1.30 mm.
If "T2" is 1.36 mm, then the reverse gear shim
is 1.38 mm.

Backlash

Measuring the forward and reverse
gear backlash
1. Remove the water pump assembly.
2. Set the gear shift to the neutral position
at the lower unit.
Shift rod push arm:
90890-06052
Shimming/Backlash
Rounded numeral
2
5
8
10
69D60035
6-26
1
2
3
4
5
6
7
8
9