Shimming (regular rotation model)
8-46
• Measure the thickness of original propeller
shaft shim (T4) in 2 places.
• Do not reuse shims.
a. Determine the propeller shaft shim (T4)
thickness adjustment using the “Pro-
peller shaft shim (T4) selection chart”
according to the propeller shaft motive
torque.
See “Propeller shaft shim (T4) selection
chart” (A-26).
• If the shim thickness adjustment value is
positive, increase the current shim thickness
by that amount and, if the value is negative,
decrease the current shim thickness by that
amount.
• The blue-colored area on the selection chart
indicates the range of the specified motive
torque. Shimming is not required if the mea-
sured motive torque is within the blue-col-
ored area.
• The values for the shim thickness adjust-
ments specified in the selection chart are in-
tended to obtain the median value within the
range for the specified motive torque.
• The table that follows the selection chart
shows the shim thickness adjustments for
the points marked on the chart.
Propeller shaft motive torque measure-
ment = 0.2 N·m “a”
Propeller shaft shim (T4) thickness ad-
justment = 0.05 mm “b”
The current shim thickness must be in-
creased by 0.05 mm.
b. Calculate the new propeller shaft shim
(T4) thickness.
• Use up to 4 shims to obtain the required
shim thickness. However, if the propeller
shaft shim thickness is 2.32 mm or more, 5
shims may be used.
• If the calculated shim thickness cannot be
obtained with a combination of the available
shims, increase or decrease the shim thick-
ness by 0.01 mm.
Calculation formula:
New propeller shaft shim (T4) thickness
= Current propeller shaft shim thick-
ness + shim thickness adjustment
Use the following formula when the
shim thickness adjustment value is
positive.
Current propeller shaft shim thickness
= 1.20 mm
Shim thickness adjustment = 0.04 mm
New propeller shaft shim (T4) thickness
= 1.20 mm + 0.04 mm = 1.24 mm
Use the following formula when the
shim thickness adjustment value is
negative.
Current propeller shaft shim thickness
= 1.30 mm
Shim thickness adjustment = –0.05
mm
New propeller shaft shim (T4) thickness
= 1.30 mm + (–0.05 mm) = 1.25 mm
0.04
0.05
0.06
0.07
–0.08
–0.07
A
B
B (mm)
0.10 0.2
A (N·m)
0.10 0.2
0.060.07 0.05
a
b
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