Backlash; Measuring The Forward Gear Backlash - Yamaha F80B Service Manual

a
NOTE:
"F" is the deviation of the lower case dimen-
sion from standard. The "F" mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the "F"
mark unreadable, assume that "F" is zero
and check the backlash when the unit is
assembled.
Forward gear shim thickness (T1) =
24.42 + F/100 – M
Example:
If "M" is "24.00 mm" and "F" is "+5", then
T1 = 24.42 + (+5)/100 – 24.00 mm
= 0.42 + 0.05 mm = 0.47 mm
If "M" is "24.00 mm" and "F" is "–5", then
T1 = 24.42 + (–5)/100 – 24.00 mm
= 0.42 – 0.05 mm = 0.37 mm
3. Select the forward gear shim(s) (T1) as
follows.
Calculated numeral
at 1/100 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
6D93G11
+ 5
F
R
+ 5
P
S68S6260
Rounded numeral
0
2
5
8
Shimming / Backlash
Example:
If "T1" is "0.47 mm", then the forward gear
shim is 0.45 mm.
If "T1" is "0.50 mm", then the forward gear
shim is 0.48 mm.

Backlash

Measuring the forward gear backlash

1. Remove the water pump assembly.
NOTE:
Do not remove the oil seal housing in this
procedure.
2. Set the gear shift to the neutral position
at the lower unit.
Shift rod push arm: 90890-06052
1
6
2
3
4
5
6
7
8
9
6-28