Backlash (Regular Rotation Model); Measuring The Forward And Reverse Gear Backlash - Yamaha F150A Service Manual

LOWR
3. Calculate the reverse gear shim thick-
ness (T2) as shown in the examples
below.
NOTE:
"R" is the deviation of the lower case dimen-
sion from standard. The "R" mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the "R"
mark is unreadable, assume that "R" is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Reverse gear shim thickness (T2) =
M2 – 29.90 – R/100
Example:
If "M2" is 30.70 mm and "R" is (+3), then
T2 = 30.70 – 29.90 – (+3)/100 mm
= 30.70 – 29.90 – 0.03 mm
= 0.77 mm
4. Select the reverse gear shim(s) (T2) 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
6-29
Lower unit
Rounded numeral
2
5
8
10
Example:
If "T2" is 0.77 mm, then the reverse gear
shim is 0.78 mm.
If "T2" is 0.79 mm, then the reverse gear
shim is 0.80 mm.
Backlash
(regular rotation model)
Measuring the forward and reverse
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.
6
63P3F11