Yamaha F90D - Selecting the Forward Gear Shims

LOWR
Lower unit
6-27
6D81G11
5. Measure the clearance (M) between the
shim selecting tool and the pinion as
shown.
NOTE:
Measure the pinion at three points to find the
clearance average.
6. Select the pinion shims (T3).
NOTE:
The sum of T3 and M0 should be more than
M.
Selecting the forward gear shims
1. Calculate the specified value (M0) as
shown in the examples below.
NOTE:
“F” is the deviation of the lower case dimen-
sion from standard. The “F” mark
a
is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the “F”
mark is unreadable, assume that “F” is zero
and check the backlash when the unit is
assembled.
Example:
If “F” is “+5”, then
M0 = 1.61 + (+5)/100 mm = 1.61 + 0.05 mm
= 1.66 mm
If “F” is “–5”, then
M0 = 1.61 + (–5)/100 mm = 1.61 – 0.05 mm
= 1.56 mm
2. Install the taper roller bearing
1
onto the
special service tools.
Calculation formula:
Pinion shim thickness (T3) = M – M0
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Specified value (M0) = 1.61 + F/100 mm
S68S6260
P
R
+
5
F
+
5
a