Yamaha F150A Service Manual page 204

LOWR
2. Install the thrust bearing 4 onto the pro-
peller shaft 5, and then measure the
propeller shaft flange and thrust bearing
thickness (M7) as shown.
3. Calculate the propeller shaft shim thick-
ness (T4) as shown in the examples
below.
a
NOTE:
"A" and "B" are the deviation of the propeller
shaft housing dimension 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.
Calculation formula 1:
Propeller shaft shim thickness (T4) =
29.30 – A/100 + B/100 – M6 – M7
Example:
If "M6" is 15.70 mm and "M7" is 12.55 mm
and "A" is (+6) and "B" is (–5), then
T4 = 29.30 – (+6)/100 + (–5)/100 – 15.70 – 12.55 mm
= 29.30 – 0.06 – 0.05 – 15.70 – 12.55 mm
= 0.94 mm
6-59
Lower unit
b
S69J6626
4. Round the numerals for the propeller
shaft shim(s) (T4) as follows.
Calculated numeral
at 1/100 place
1, 2
3, 4, 5
6, 7, 8
9, 10
Example:
If "T4" is 0.94 mm, then the propeller shaft
shim is 0.92 mm.
If "T4" is 1.00 mm, then the propeller shaft
shim is 0.98 mm.
5. Calculate and select the propeller shaft
shim thickness (T'4) as shown in the
examples below.
Calculation formula 2:
Propeller shaft shim thickness (T'4) =
T4 – 0.30
Example:
If "T4" is 0.92 mm, then
T'4 = 0.92 – 0.30 mm
= 0.62 mm
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
6. If the "A" mark or "B" mark is unreadable,
measure the propeller shaft free play as
shown.
7. Install the shim(s) 6, thrust bearing 4,
propeller shaft 5, and taper roller bear-
ing 7 into the propeller shaft housing.
Rounded numeral
0
2
5
8
63P3F11