Backlash (Ft50, Ft60); Measuring The Forward Gear Backlash - Yamaha F50F Service Manual

a
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 unreadable, assume that "F" is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Forward gear shim thickness (T1) =
24.50 + F/100 – M
Example:
If "M" is "24.00 mm" and "F" is "+5", then
T1 = 24.50 + (+5)/100 – 24.00 mm
= 0.50 + 0.05 mm = 0.55 mm
If "M" is "24.00 mm" and "F" is "–5", then
T1 = 24.50 + (–5)/100 – 24.00 mm
= 0.50 – 0.05 mm = 0.45 mm
3. Select the forward gear shim(s) (T1) as
follows.
Calculated numeral
at 1/100 place
1, 2
3, 4, 5
6, 7, 8
9, 10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Example:
If "T1" is "0.55 mm", then the forward gear
shim is 0.52 mm.
6C13G11
+ 5
F
R
+ 5
P
S68S6260
Rounded numeral
0
2
5
8
Shimming (FT50, FT60) / Backlash (FT50, FT60)
If "T1" is "0.50 mm", then the forward gear
shim is 0.48 mm.

Backlash (FT50, FT60)

Measuring the forward gear backlash

1. Remove the water pump assembly.
2. Set the gear shift to the neutral position
at the lower unit.
Shift rod push arm: 90890-06052
3. Install the special service tools so that it
pushes against the propeller shaft.
NOTE:
Tighten the center bolt while turning the drive
shaft until the drive shaft can no longer be
turned.
Bearing housing puller claw L 1:
90890-06502
Stopper guide plate 2: 90890-06501
Center bolt 3: 90890-06504
1
6
2
3
4
5
6
7
8
9
6-50