Yamaha F225F Service Manual page 468

LOWR
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 cell on the selection table
indicates the specified propeller shaft free
play. Shimming is not required if the mea-
sured propeller shaft free play is 0.25–0.35
mm.
• The values for the shim thickness adjust-
ments specified in the selection table are
intended to obtain the specified propeller
shaft free play of 0.3 mm.
8. Calculate the new propeller shaft shim
(T4) thickness.
Calculation formula:
New propeller shaft shim (T4) thickness =
Current propeller shaft shim thickness +
Shim thickness adjustment
Example:
Use the following formula when the shim
thickness adjustment value is positive.
Current propeller shaft shim thickness = 0.8
mm
Shim thickness adjustment = 0.2 mm
New propeller shaft shim (T4) thickness
= 0.8 mm + 0.2 mm
= 1.0 mm
Use the following formula when the shim
thickness adjustment value is negative.
Current propeller shaft shim thickness = 0.8
mm
Shim thickness adjustment = –0.1 mm
New propeller shaft shim (T4) thickness
= 0.8 mm + (–0.1) mm
= 0.7 mm
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm
TIP:
Use up to 3 shims to obtain the required shim
thickness.
8-89
Lower unit
9. Remove the special service tools, and
then install the determined propeller
shaft shims.