Yamaha F225F Service Manual page 471

TIP:
• If the shim thickness adjustment value is
positive, the current shim thickness must be
increased by that amount and, if the value
is negative, the current shim thickness must
be decreased by that amount.
• The gray-colored area on the selection
chart indicates the range of the specified
backlash. Shimming is not required if the
measured backlash is within the gray-col-
ored area.
• The values for the shim thickness adjust-
ments specified in the selection chart are
intended to obtain the median value within
the range for the specified forward gear
backlash.
• The table that follows the selection chart
shows the shim thickness adjustments for
the points marked on the chart.
4. Calculate the new forward gear shim (T2)
thickness.
Calculation formula:
New forward gear shim (T2) thickness = Cur-
rent forward gear shim thickness + Shim
thickness adjustment
Example:
Use the following formula when the shim
thickness adjustment value is positive.
Current forward gear shim thickness = 0.75
mm
Shim thickness adjustment = 0.34 mm
New forward gear shim (T2) thickness
= 0.75 mm + 0.34 mm
= 1.09 mm
Use the following formula when the shim
thickness adjustment value is negative.
Current forward gear shim thickness = 0.75
mm
Shim thickness adjustment = –0.31 mm
New forward gear shim (T2) thickness
= 0.75 mm + (–0.31) mm
= 0.44 mm
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm
Shimming (counter rotation model)
TIP:
• Use up to 3 shims to obtain the required
shim thickness.
• If the calculated shim thickness cannot be
obtained with a combination of the available
shims, decrease the shim thickness by
0.01 mm.
5. Install the determined forward gear shims
(T2), and propeller
assembly. See step 2 in "Installing the
propeller shaft housing assembly" (8-79)
and steps 4–6 in "Installing the propeller
shaft housing assembly" (8-29).
0
1
shaft housing
2
3
4
5
6
7
8
9
10
A
8-92