Yamaha F50 Service Manual

							62Y3A116-42
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No. Part name Q’ty RemarksTightening torques
Stage N·mkgf·mft·lb
1 Lower unit 1
2 Plastic tie 1
Not reusable
3Hose 1
4 Check screw 1 7 0.7 5.1
5 Gasket 2
Not reusable
6 Dowel pin 2
7 Bolt 4 M10 ×
 40 mm 40 4.0 29
8 Drain screw 1 7 0.7 5.1
9Grommet 1
10 Bolt 1 M10 ×
 45 mm,  : 12 mm
11 Bolt 1 M8 ×
 60 mm
12 Thrust washer 1
13 Propeller 1
14 Washer 1
15 Washer 1
16 Cotter pin 1
Not reusable
17 Propeller nut 1 35 3.5 25
18 Trim tab 1
Lower unit (T50/FT50B, FT50C) 
						

							LOWRLower unit
6-4362Y3A11
Removing the lower unit
1. Drain the gear oil. For draining proce-
dures, see Chapter 3, “Replacing the
gear oil.”
2. Set the gearshift to the neutral position,
and place a block of wood between the
anti-cavitation plate and propeller to keep
the propeller from turning, and then
remove the propeller nut and propeller.
 WARNING
Do not hold the propeller with your hands
when loosening or tightening it. Be sure
to remove the battery leads from the bat-
teries and the engine shut-off switch. Put
a block of wood between the cavitation
plate and propeller to keep the propeller
from turning.
3. Disconnect the speedometer hose 1
.
4. Mark the trim tab 2
 at the area shown,
and then remove it.5. Loosen the bolts, and then remove the
lower unit from the upper case. 
						

							62Y3A116-44
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— MEMO —
Lower unit (T50/FT50B, FT50C) 
						

							LOWRLower unit
6-4562Y3A11
Water pump and shift rod (T50/FT50B, FT50C)6 
						

							62Y3A116-46
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No. Part name Q’ty RemarksTightening torques
Stage N·mkgf·mft·lb
1 Shift rod assembly 1
2 Oil seal 1
Not reusable
3 Oil seal housing 1
4 O-ring 1
Not reusable
5 Circlip 1
6 Shift rod 1
7 O-ring 1
Not reusable
8Bolt 2 M6 ×
 16 mm
9 Woodruff key 1
10 Bolt 2 M8 ×
 55 mm
11 Bolt 2 M8 ×
 45 mm
12 Water pump housing 1
13 Grommet 1
14 Gasket 1
Not reusable
15 Insert plate cartridge 1
16 Impeller 1
17 Outer plate cartridge 1
18 Gasket 1
Not reusable
19 Dowel pin 2
20 Oil seal housing assembly 1
21 Gasket 1
Not reusable
22 Oil seal housing 1
23 O-ring 1
Not reusable
24 Oil seal 2Not reusable
Water pump and shift rod (T50/FT50B, FT50C) 
						

							LOWRLower unit
6-4762Y3A11
Removing the water pump and shift 
rod
1. Remove the water pump assembly and
shift rod assembly 1
.
NOTE:
Pull up the shift rod assembly a little a
 to dis-
connect it from the shift slider 2
, turn it coun-
terclockwise 90° b
, and then remove it.
Checking the water pump and shift 
rod
1. Check the pump housing for deforma-
tion. Replace if necessary.2. Check the impeller 1
 and insert plate
cartridge 2
 for cracks or wear. Replace
if necessary.
3. Check the Woodruff key 3
 and the
groove a
 on the drive shaft for wear.
Replace if necessary.
4. Check the shift rod for cracks or wear.
Replace if necessary.
S62Y6535
S62Y6540
2
1
S62Y6545
3 
						

							62Y3A116-48
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Installing the water pump and shift 
rod
1. Install the shift rod assembly 1
.
NOTE:
Install the shift rod assembly into the lower
case, turn it clockwise 90° a
, and then push
it down b
 to connect it to the shift slider 2
.
2. Install the new oil seals into the oil seal
housing as shown. 
È
For USA and Canada
É
For worldwide
3. Install the new O-ring 7
.
4. Install the new gasket 8
, oil seal housing
9
, new gasket 0
, and outer plate car-
tridge A
.
5. Install the Woodruff key into the drive
shaft.
Bearing housing oil seal installer 3
:
YB-06269
Driver handle 4
: YB-06071
Needle bearing attachment 5
:
90890-06610
Driver rod L3 6
: 90890-06652
Water pump and shift rod (T50/FT50B, FT50C) 
						

							LOWRLower unit
6-4962Y3A11
6. Align the groove on the impeller B
 with
the Woodruff key C
, and then install it to
the drive shaft.
7. Install the insert plate cartridge D
 and
grommet E
 into the pump housing F
.
NOTE:
Align the insert plate cartridge projection c
with the hole d
 in the pump housing.8. Install the new gasket G
, pump housing
assembly F
, and dowel pins H
 to the
lower case.
9. Install and tighten the bolts I
.NOTE:
When installing the pump housing, apply
grease to the inside of the housing, and then
turn the drive shaft clockwise while pushing
down the pump housing.
 S62Y6580
F
E
D
A
d
c
S62Y6585
F
I
H
G 
						

							62Y3A116-50
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— MEMO —
Water pump and shift rod (T50/FT50B, FT50C) 
						

							LOWRLower unit
6-5162Y3A11
Propeller shaft housing (T50/FT50B, FT50C)6