Yamaha F400A 2022 - Page 460

8-61
Shimming (counter rotation model)
4. Select:
• Propeller shaft shim (T4) thicknesses
a. Select the propeller shaft shim (T4)
thicknesses if out of specification.
TIP:
Use the rounded measurement value for the
free play measurement.
b. Determine the value of propeller shaft
shim (T4) thickness adjustment using
the “Propeller shaft shim (T4) selection
table” according to the free play mea-
surement. See “Propeller shaft shim
(T4) selection table” (A-27).
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 blue-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 0.42–0.52
mm.
• The values for the shim thickness adjust-
ments specified in the selection table are in-
tended to obtain the specified propeller shaft
free play of 0.50 mm.
Example:
Free play measurement = 1.1 mm “a”
Propeller shaft shim (T4) thickness ad-
justment = 0.6 mm “b”
The current shim thickness must be in-
creased by 0.6 mm.
c. Calculate the new propeller shaft shim
(T4) thickness.
TIP:
Use up to 3 shims to obtain the required shim
thickness.
Calculation formula:
New propeller shaft shim (T4) thickness
= Current propeller shaft shim thick-
ness + 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
Dial gauge set “1”
90890-03238
Magnet base B “2”
90890-06844
Dial indicator gauge “1”
YU-03097
Magnetic base stand “2”
YU-A8438
Free play
0.42–0.52 mm (0.0165–0.0205
in) (FL400ASTU, FL400ASTX,
FL450AVTU, FL450AVTX)
A. Free play measurement
B. Shim thickness adjustment
Available shim thicknesses
Propeller shaft shims
0.10/0.12/0.15/0.18/0.30/0.40/
0.50 mm (FL400ASTU,
FL400ASTX, FL450AVTU,
FL450AVTX)
(mm)
A
B
1.0
1.1
+0.5 +0.6
a
b