Yamaha 25 NMHOS [172/245] Backlash
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Yamaha 25 NMHOS [172/245] Backlash

Yamaha 25 NMHOS [172/245] Backlash
LOWR
6-27
69R3J11
Lower unit
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.
Example:
If “M2” is 78.79 mm and “R” is (+5), then
T2 = 80.00 mm + (+5)/100 – 78.79 mm
= 80.05 – 78.79
= 1.26 mm
4. Select the reverse gear shim(s) (T2) as
follows.
Example:
If “T2” is 1.26 mm, then the reverse gear
shim is 1.2 mm.
If “T2” is 1.31 mm, then the reverse gear
shim is 1.3 mm.
Backlash
Measuring the forward and reverse
gear backlash
1. Remove the water pump assembly.
2. Set the gear shift to “N” position.
3. Install the special service tools so that it
pushes against the propeller shaft, and
then turn the lower unit 90° to the upside
position.
6S660240
a
Calculation formula:
Reverse gear shim thickness (T2) =
80.00 + R/100 – M2
Available shim thicknesses:
1.0, 1.1, 1.2 and 1.3 mm
Calculated numeral
at 1/100th place Use shim
more than less than
1.00 1.10 1.0
1.10 1.20 1.1
1.20 1.30 1.2
1.30 1.32 1.3
6B460430
69R60320
1
2
3
69R3J11_06 06.7.6 11:37 Page 28

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