Yamaha 90A - Shim Selection; For Usa and Canada

6-17
E
LOWR
SHIM SELECTION (FOR USA AND CANADA)
SHIM SELECTION
NOTE:
1. When reassembling the lower unit with
the original gear case and inner parts,
shim selection is not required.
2. When replacing the gear case only, read
the numeral preceded by “F, R, P” and
adjust the shims according to the differ-
ence between numerals of the original
gear-case and the new gear-case.
3. If the bearing(s) and/or gear(s) are
replaced, carry out the shim selection.
FOR USA AND CANADA
Pinion gear shim
NOTE:
Find pinion gear shim thickness (T3) by
selecting shims until the specified measure-
ment (M) with the special tool is obtained.
1. Find the specified measurement (M).
NOTE:
1. P is the deviation of the lower case
dimension from standard. It is stamped
on the trim tab mounting surface of the
lower case in 0.01 mm units. If the P
mark is missing or unreadable, assume a
P mark of “0” and check the backlash
when the unit is assembled.
2. If the P value is negative (–), then sub-
tract the P value from the measurement.
Specified Measurement (M) =
0.20 mm + P/100 mm