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 (T50/FT50B, FT50C) 
						

							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
: YB-06207
Universal puller 4
: YB-06117
Bearing housing puller claw L 5
:
90890-06502
Stopper guide plate 6
: 90890-06501
Center bolt 7
: 90890-06504
Slide hammer and adapters 1
: YB-06096 
Bearing separator 2
: 90890-06534
Stopper guide plate 3
: 90890-06501
Stopper guide stand 4
: 90890-06538
Bearing puller 5
: 90890-06535
Bearing puller claw 1 6
: 90890-06536 
						

							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 and cleaning solvent, and then
check it for cracks. Replace if necessary.
Slide hammer and adapters 7
: YB-06096 
Stopper guide plate 8
: 90890-06501
Stopper guide stand 9
: 90890-06538
Bearing puller 0
: 90890-06535
Bearing puller claw 1 A
: 90890-06536
Bearing housing needle bearing remover B
:
YB-06153
Needle bearing attachment B
:
90890-06612
Driver handle C
: YB-06071
Driver rod L3 C
: 90890-06652
Propeller shaft housing (T50/FT50B, FT50C) 
						

							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
facing toward the shift slider.
Assembling the propeller shaft 
housing
1. Install the needle bearing into the propel-
ler shaft housing to the specified depth.
S62Y6640
S62Y6645 
						

							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 propeller
shaft housing, then the other oil seal.
3. Install the thrust washer 0
 and ball bear-
ing A
 to the reverse gear B
 using a
press.
ÈFor USA and Canada
ÉFor worldwide
Driver handle 1
: YB-06071
Bearing housing needle bearing remover 2
:
YB-06153
Driver rod SS 3
: 90890-06604
Needle bearing attachment 4
:
90890-06612
Bearing depth plate 5
: 90890-06603
Depth c
: 25.0–25.5 mm (0.98–1.00 in)
Bearing housing oil seal installer 6
:
YB-06269
Driver handle 7
: YB-06071
Ball bearing attachment 8
: 90890-06655
Driver rod LS 9
: 90890-06606
Depth d
: 4.5–5.5 mm (0.18–0.22 in)
Propeller shaft housing (T50/FT50B, FT50C) 
						

							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
, claw washer
6
, and ring nut 7
.
4. Tighten the nut to the specified torque.
NOTE:
Secure the ring nut by bending one tab a
into the slot in the ring nut and the other tabs
toward the propeller shaft housing assembly. Drive shaft needle bearing depth stop C
:
YB-34473
Bearing inner race attachment D
:
90890-06639
Forward gear bearing cup installer E
:
YB-06109
Bearing inner race attachment E
:
90890-06661 
						

							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 Pinion 1
21 Nut 1 : 22 mm 95 9.5 69
22 Lower case 1
Drive shaft and lower case (T50/FT50B, FT50C) 
						

							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
forward gear using a press.
CAUTION:
Do not reuse the bearing, always replace
it with a new one.
2. Remove the needle bearing from the for-
ward gear. Drive shaft holder 1
: YB-06049
Drive shaft holder 4 1
: 90890-06518
Pinion nut holder 2
: 90890-06505
Socket adapter 2 3
: 90890-06507
S62Y6850K
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Bearing splitter plate 3
: YB-06219
Bearing inner race attachment 4:
90890-06639
Bearing splitter plate 1: YB-06219
Bearing separator 1: 90890-06534
S62Y6740K
1