Yamaha F225A Service Manual page 191

Shimming (regular rotation model) / Backlash (regular rotation model)
A – 3
NOTE:
"R" is the deviation of the lower case dimen-
sion from standard, and "A" is the deviation of
the propeller shaft housing from standard.
The "R" mark a is stamped on the trim tab
mounting surface of the lower case, and the
"A" mark b is stamped on the propeller shaft
housing in 0.01 mm units. If the "R" mark or
"A" mark is unreadable, assume that "R" and
"A" are zero and check the backlash when
the unit is assembled.
Calculation formula:
Reverse gear shim thickness (T2) =
21.00 + R/100 – A/100 – M2
Example:
If "M2" is 19.92 mm and "R" is (+3) and "A" is
(–5), then
T2 = 21.00 + (+3)/100 – (–5)/100 – 19.92 mm
= 21.00 + 0.03 + 0.05 – 19.92 mm
= 1.16 mm
3. Select the reverse gear shim(s) (T2) as
follows.
69J3D11
B
S69J6625
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
Example:
If "T2" is 1.16 mm, then the reverse gear
shim is 1.15 mm.
If "T2" is 1.20 mm, then the reverse gear
shim is 1.18 mm.
Backlash
(regular rotation model)
Measuring the forward and reverse
gear backlash
1. Remove the water pump assembly.
2. Set the gearshift to the neutral position.
É
Shift rod push arm: 90890-06052
3. Install the special service tool so that it
pushes against the propeller shaft.
Rounded numeral
0
2
5
8
6
6-30
1
2
3
4
5
6
7
8
9