LOWR
Lower unit
6-27
6D55F11
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 anode 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 (–1), then
T2 = 80.00 + (–1)/100 – 78.79 mm
= 80.00 – 0.01 – 78.79 mm
= 1.20 mm
4.
Select the reverse gear shim(s) (T2) as
follows.
Example:
If “T2” is 1.05 mm, then the reverse gear
shim is 1.0 mm.
If “T2” is 1.20 mm, then the reverse gear
shim is 1.1 mm.
Backlash
6
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.
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.
4.
Install the backlash indicator onto the
drive shaft (16.0 mm [0.63 in] in diame-
ter), then the dial gauge onto the lower
unit.
Calculation formula:
Reverse gear shim thickness (T2) =
80.00 + R/100 – M2
Calculated numeral
Shim size to
use
More than
Up to
0.99
1.10
1.0
1.10
1.20
1.1
1.20
1.30
1.2
1.30
1.32
1.3
Available shim thicknesses:
1.0, 1.1, 1.2, and 1.3 mm
+5
-1
+5
S6D56430
a
Bearing housing puller claw S
1
:
90890-06564
Stopper guide plate
2
: 90890-06501
Center bolt
3
: 90890-06504
Summary of Contents for F2.5C
Page 1: ...F25C SERVICE MANUAL 6D5 28197 5F 11 290539 ...
Page 4: ......
Page 16: ...GEN INFO General information 1 11 6D55F11 MEMO ...
Page 27: ...6D55F11 2 10 1 2 3 4 5 6 7 8 9 Clamp bracket Maintenance specification ...
Page 112: ...POWR Power unit 5 51 6D55F11 MEMO ...
Page 136: ...LOWR Lower unit 6 23 6D55F11 Shimming 6 S6D56370 T3 A3 B3 42 5 T1 T2 24 0 24 0 B2 A1 A2 B1 ...
Page 173: ...6D55F11 TRBL SHTG 1 2 3 4 5 6 7 8 9 Troubleshooting Power unit 9 1 ...
Page 183: ......
Page 184: ...YAMAHA MOTOR CO LTD Printed in Japan Nov 2003 0 4 1 CR E Printed on recycled paper ...