Yamaha F50 Service Manual

62Y3A116-52
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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
3Ball 2
4 Slider 1
5 Shift plunger 1
6Cross pin 1
7 Dog clutch 1
8Spring 1
9 Propeller shaft 1
10 Washer 1
11 Straight key 1
12 Claw washer 1
13 Ring nut 1 105 10.5 76
14 Reverse gear 1
15 Thrust washer 1
16 Ball bearing 1
17 O-ring 1
Not reusable
18 Propeller shaft housing 1
19 Needle bearing 1
20 Oil seal 2
Not reusable
Propeller shaft housing...

LOWRLower unit
6-5362Y3A11
Removing the propeller shaft 
housing assembly
1. Straighten the claw washer tabs a
, and
then remove the ring nut and claw
washer.
2. Pull out the propeller shaft housing
assembly.
ÈFor USA and Canada
ÉFor worldwide
Disassembling the propeller shaft 
housing
1. Remove the reverse gear and thrust
washer.
ÈFor USA and Canada
ÉFor worldwide
Gland nut wrench 1
: YB-34447
Ring nut wrench 3 1
: 90890-06511
Ring nut wrench extension 2
:
90890-06513
Bearing housing puller 3
:...

62Y3A116-54
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NOTE:
Install the bearing separator 2
 between the
reverse gear and thrust washer completely,
then the other special service tools.
2. Remove the ball bearing.
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
, and then remove
the cross pin 2
, dog clutch 3
, slider and
shift plunger.
Checking the propeller shaft housing
1. Clean the propeller shaft housing using a
soft brush...

LOWRLower unit
6-5562Y3A11
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 propeller shaft for bends or
wear. Replace if necessary.
2. Check the dog clutch and shift slider for
cracks or wear. Replace if necessary.
Assembling the propeller shaft 
assembly
1. Install the dog clutch as shown.
NOTE:
Install the dog clutch 1
 with the “F” mark a...

62Y3A116-56
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ÈFor USA and Canada
ÉFor worldwide
NOTE:
Install the needle bearing with the manufac-
ture identification mark a
 facing toward the
oil seal (propeller side).
When using the driver rod, do not strike the
special tool in a manner that will force the
stopper b
 out of place.
2. Apply grease to the new oil seals, and
then install them into the propeller shaft
housing to the specified depth.
ÈFor USA and Canada
ÉFor worldwide
NOTE:
Install an oil seal halfway into the...

LOWRLower unit
6-5762Y3A11
NOTE:
Install the ball bearing with the manufacture
identification mark e
 facing outward (propel-
ler side).
4. Install the reverse gear assembly to the
propeller shaft housing using a press.
Installing the propeller shaft housing
1. Install the washer 1
, propeller shaft
assembly 2
, into the propeller shaft
housing assembly 3
. 
2. Apply grease to the new O-rings.3. Install the propeller shaft housing assem-
bly 4
 into the lower case, and then
install the straight key 5
,...

62Y3A116-58
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Gland nut wrench 8
: YB-34447
Ring nut wrench 3 8
: 90890-06511
Ring nut wrench extension 9
:
90890-06513
Ring nut 7
: 105 N·m (10.5 kgf·m, 76 ft·lb)
Propeller shaft housing (T50/FT50B, FT50C) 

LOWRLower unit
6-5962Y3A11
Drive shaft and lower case (T50/FT50B, FT50C)6 

62Y3A116-60
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No. Part name Q’ty RemarksTightening torques
Stage N·mkgf·mft·lb
1 Drive shaft 1
2 Taper roller bearing 1
Not reusable
3 Bearing outer race 1Not reusable
4 Pinion shim—As required
5 Sleeve 1
6Hose 1
7 Plastic tie 1
Not reusable
8 Joint 1
9Nut 1
10 Water inlet cover 2
11 Screw 1 5 0.5 3.6
12 Seal 1
13 Plate 1
14 Forward gear shim—As required
15 Bearing outer race 1
Not reusable
16 Taper roller bearing 1Not reusable
17 Needle bearing 1
18 Forward gear 1
19 Needle bearing 1
20...

LOWRLower unit
6-6162Y3A11
Removing the drive shaft
1. Remove the drive shaft assembly and
pinion, and then pull out the forward
gear.
Disassembling the drive shaft
1. Install the pinion nut 1
, tighten it finger
tight, and then remove the drive shaft
bearing 2
 using a press.
ÈFor USA and Canada
ÉFor worldwide
CAUTION:
•Do not press the drive shaft threads 
a
directly.
•Do not reuse the bearing, always
replace it with a new one.
Disassembling the forward gear
1. Remove the taper roller bearing from the...