Selecting The Reverse Gear Shims - Yamaha F225A Service Manual

LOWR
2. Calculate the forward gear shim thickness
(T1) as shown in the examples below.
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 is unreadable, assume that "F" is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Forward gear shim thickness (T1) =
29.50 + F/100 – M1
Example:
If "M1" is 29.10 mm and "F" is (+5), then
T1 = 29.50 + (+5)/100 – 29.10 mm
= 29.50 + 0.05 – 29.10 mm
= 0.45 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
6-29
Lower unit
Rounded numeral
0
2
5
8
Example:
If "T1" is 0.45 mm, then the forward gear
shim is 0.42 mm.
If "T1" is 0.60 mm, then the forward gear
shim is 0.58 mm.

Selecting the reverse gear shims

1. Turn the ball bearing 1 two or three
times, and then measure the bearing
height (M2) as shown.
NOTE:
• Select the shim thickness (T2) by using the
specified measurement(s) and the calcula-
tion formula.
• Measure the reverse gear at three points to
find the height average.
Shimming plate 2: 90890-06701
Digital caliper 3: 90890-06704
2. Calculate the reverse gear shim thick-
ness (T2) as shown in the examples
below.
69J3D11