Yamaha F225F Service Manual page 437

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 reverse 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 reverse gear shim (T2)
thickness.
Calculation formula:
New reverse gear shim (T2) thickness = Cur-
rent reverse gear shim thickness + Shim
thickness adjustment
Example:
Use the following formula when the shim
thickness adjustment value is positive.
Current reverse gear shim thickness = 0.75
mm
Shim thickness adjustment = 0.42 mm
New reverse gear shim (T2) thickness
= 0.75 mm + 0.42 mm
= 1.17 mm
Use the following formula when the shim
thickness adjustment value is negative.
Current reverse gear shim thickness = 0.75
mm
Shim thickness adjustment = –0.39 mm
New reverse gear shim (T2) thickness
= 0.75 mm + (–0.39) mm
= 0.36 mm
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm
Shimming (regular 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 reverse gear shims
(T2), propeller shaft assembly, and
propeller shaft housing assembly. See
"Installing the propeller shaft housing
assembly" (8-29).
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