Yamaha F50 Service Manual

62Y3A116-12
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No. Part name Q’ty RemarksTightening torques
Stage N·mkgf·mft·lb
1 Propeller shaft assembly 1
2 Propeller shaft housing 
assembly1
3 Spacer 1
4Grommet 1
5Bolt 4 M8 ×
 20 mm
6 Water pump housing 1
7 Insert plate cartridge 1
8Impeller 1
9 O-ring 1
Not reusable
10 Outer plate cartridge 1
11 Gasket 1
Not reusable
12 Dowel pin 2
13 Woodruff key 1
14 Slider 1
15 Spring 1
16 Cross pin 1
17 Dog clutch 1
18 Spring 1
19 Propeller shaft 1
20 Shift plunger 1
21 Washer 1
22 Bolt 2 M8 ×...

LOWRLower unit
6-1362Y3A11
Removing the water pump and 
propeller shaft housing assembly
1. Remove the water pump assembly.
2. Remove the propeller shaft housing
assembly by removing the bolts 1
, then
pulling the housing out.
ÈFor USA and Canada
ÉFor worldwide
Disassembling the propeller shaft 
housing
1. Remove the reverse gear and shim(s).
ÈFor USA and Canada
ÉFor worldwide
NOTE:
Install the bearing separator 2
 between the
reverse gear and propeller shaft housing
completely, then the other special...

62Y3A116-14
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ÈFor USA and Canada
ÉFor worldwide
3. Remove the oil seals and needle bear-
ing.
Disassembling the propeller shaft 
assembly
1. Remove the spring 1
, then the cross pin
2
, dog clutch 3
, slider, and spring.
Checking the water pump
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. Slide hammer and adapters 7
: YB-06096 
Stopper guide plate 8
: 90890-06501
Stopper...

LOWRLower unit
6-1562Y3A11
3. Check the Woodruff key 3
 and the
groove a
 on the drive shaft for wear.
Replace if necessary.
Checking the propeller shaft housing
1. Clean the propeller shaft housing using a
soft brush and cleaning solvent, and then
check it for cracks. Replace if necessary.
2. Check the teeth and dogs of the reverse
gear for cracks or wear. Replace the
gear if necessary.
3. Check the bearings for pitting or rum-
bling. Replace if necessary.
Checking the propeller shaft
1. Check the...

62Y3A116-16
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Assembling the propeller shaft 
assembly
1. Install the dog clutch as shown.
NOTE:
Install the dog clutch 1
 with the “F” mark a
facing toward the shift plunger.
Assembling the propeller shaft 
housing
1. Install the needle bearing into the propel-
ler shaft housing to the specified depth.
È
For USA and Canada
É
For worldwide
NOTE:
Install the needle bearing with the manufac-
ture identification mark a
 facing toward the
oil seal (propeller side).
Do not strike the driver...

LOWRLower unit
6-1762Y3A11
3. Install the original shim(s) 0
 and ball
bearing into the reverse gear using a
press.
ÈFor USA and Canada
ÉFor worldwide
CAUTION:
Add or remove shims, if necessary, when
replacing the reverse gear or propeller
shaft housing.
NOTE:
Install the ball bearing with the manufacture
identification mark 
f facing outward (propel-
ler side).4. Install the reverse gear assembly to the
propeller shaft housing using a press. Oil seal installer 6
: YB-06168
Driver handle 7
: YB-06071...

62Y3A116-18
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Installing the propeller shaft housing
1. Install the washer 1
, propeller shaft
assembly 2
, and shift plunger 3
, into
the propeller shaft housing assembly 4
.
2. Apply grease to the new O-rings.
3. Install the propeller shaft housing assem-
bly into the lower case 5
, and then
tighten the bolts 6
.
NOTE:
When installing the propeller shaft assembly,
be sure not to drop the shift plunger 3
.
Installing the water pump
1. Install the new gasket and outer plate
cartridge.
2....

LOWRLower unit
6-1962Y3A11
5. Install the O-ring 5
, pump housing
assembly 4
, and dowel pins 6
 into the
lower case, tighten the bolts 7
, and then
install the grommet 8
 and spacer 9
.
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.
Align the spacer projection a
 with the hole
b
 in the pump housing.
S62Y6200J
A
a
b 9
8
7
4
6
5 6 

62Y3A116-20
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— MEMO —
Water pump and propeller shaft housing (F50/F50A) 

LOWRLower unit
6-2162Y3A11
Drive shaft and lower case (F50/F50A)6