Yamaha F20A, Service Manual

Page: 256 / 444

6-26
E
LOWR
SHIMMING (EXCEPT FOR USA AND CANADA)
4. Calculate:
●
Pinion gear shim thickness (T3)
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)
Pinion gear shim thickness (T3) =
M – 27 mm – P/100 mm
5. Select:
●
Pinion gear shim(s)
Calculated numeral
Shim size to
use
More than or less than
1.10 1.20 1.2
1.20 1.30 1.3
1.30 1.40 1.4
1.40 1.50 1.5
1.50 1.60 1.6
1.60 1.70 0.7 + 1.0
1.70 1.83 0.7 + 1.1
Available shim thickness:
0.7, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, and
1.6 mm