Yamaha FT50C - Backlash; Selecting the Reverse Gear Shims; Measuring the Forward Gear Backlash

LOWR
Lower unit
6-27
62Y5A11
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.
Example:
If “T1” is “0.45 mm”, then the forward gear
shim is 0.42 mm.
If “T1” is “0.50 mm”, then the forward gear
shim is 0.48 mm.
Selecting the reverse gear shims
There is no need to select the reverse gear
shims.
Backlash
6
Measuring the forward gear backlash
1. Remove the water pump assembly.
2. Set the gearshift to the neutral position.
3. Install the special service tool so that it
pushes against the propeller shaft.
NOTE:
Tighten the universal puller or center bolt
while turning the drive shaft until the drive
shaft can no longer be turned.
4. Install the backlash indicator onto the
drive shaft (18 mm [0.71 in] in diameter),
then the dial gauge onto the lower unit.
Calculated numeral
at 1/100 place
Rounded numeral
1, 2 0
3, 4, 5 2
6, 7, 8 5
9, 10 8
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Shift rod push arm: 90890-06052
Bearing housing puller claw L
1
:
90890-06502
Stopper guide plate
2
: 90890-06501
Center bolt
3
: 90890-06504