Yamaha 250GETO, Service Manual

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6S35H11 6-60
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Shimming (counter rotation model)
3. Calculate the propeller shaft shim thick-
ness (T4) as shown in the examples
below.
NOTE:
“A” and “B” are the deviations of the propeller
shaft housing dimensions from standard. The
“A” mark
a
and “B” mark
b
are stamped on
the propeller shaft housing in 0.01 mm units.
If the “A” mark or “B” mark is unreadable,
assume that “A” and “B” are zero and check
the free play when the unit is assembled.
Example:
If “M6” is 14.75 mm and “M7” is 12.50 mm
and “A” is (– 3) and “B” is (– 5), then
T4 = 28.00 + (–3)/100 – (– 5)/100 –
14.75 – 12.50 mm
= 28.00 + 0.03 + 0.05 – 14.75 – 12.50 mm
= 0.83 mm
If “M6” is 14.75 mm and “M7” is 12.50 mm
and “A” is (+ 7) and “B” is (– 6), then
T4 = 28.00 + (+ 7)/100 – (– 6)/100 –
14.75 – 12.50 mm
= 28.00 + 0.03 + 0.06 – 14.75 – 12.50 mm
= 0.88 mm
4. Round the numerals for the propeller
shaft shim(s) (T4) as follows.
Example:
If “T4” is 0.83 mm, then the propeller shaft
shim is 0.82 mm.
If “T4” is 0.88 mm, then the propeller shaft
shim is 0.85 mm.
5. Calculate and select the propeller shaft
shim thickness (T’4) as shown in the
examples below.
Example:
If “T4” is 0.82 mm, then
T’4 =
0.82 – 0.30 mm
= 0.52 mm
If “T4” is 0.85 mm, then
T’4 =
0.85 – 0.30 mm
= 0.55 mm
6. If the “A” mark or “B” mark is unreadable,
measure the propeller shaft free play as
shown.
S69J6626
a b
Calculation formula 1:
Propeller shaft shim thickness (T4) =
28.00 – A/100 – B/100 – M6 – M7
Calculated numeral
Rounded numeral
at 1/100th place
1, 2 0
3, 4, 5 2
6, 7, 8 5
9, 10 8
Calculation formula 2:
Propeller shaft shim thickness (T’4) =
T4 – 0.30
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
6S35H11_061 05.9.5 14:15 Page 63