Yamaha F20A Service Manual page 256

LOWR
SHIMMING (EXCEPT FOR USA AND CANADA)
4. Calculate:
Pinion gear shim thickness (T3)
Pinion gear shim thickness (T3) =
M – 27 mm – P/100 mm
NOTE:
"P" is the deviation of the lower case
dimension from standard. It is stamped
on the anode mounting surface of the
lower case in 0.01 mm units. If the "P"
mark is missing or unreadable, assume a
"P" value of "0", and check the backlash
when the unit is assembled.
If the "P" mark is negative (–), then add
the "P" value to the measurement.
Example:
If M is "28.30 mm" and "P" is "+5", then:
T3 = 28.30 mm – 27 mm – (+5)/100
= 1.3 mm – 0.05 mm
= 1.25 mm (0.049 in)
If M is "28.24 mm" and "P" is "–3", then:
T3 = 28.24 mm – 27 mm – (–3)/100
= 1.24 mm + 0.03 mm
= 1.27 mm (0.05 in)
5. Select:
Pinion gear shim(s)
Calculated numeral
More than
1.10
1.20
1.30
1.40
1.50
1.60
1.70
Available shim thickness:
0.7, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, and
1.6 mm
6-26
Shim size to
use
or less than
1.20
1.30
1.40
1.50
1.60
1.70 0.7 + 1.0
1.83 0.7 + 1.1
E
1.2
1.3
1.4
1.5
1.6