Yamaha F50 Service Manual

							62Y3A116-72
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2. Install the taper roller bearing 1
 to the
shim selecting tools.
NOTE:
Tighten the nut four turns after it contacts the
spring.
3. Measure the clearance (M) between the
gauge pin and the press plate.4. Select the forward gear shims (T1).
NOTE:
The sum of T1 and M should not be more
than M0.
Forward gear shim selecting tools:
YB-34446-1 2
, YB-34446-3 3
,
YB-34446-5 4
, YB-34446-7 5
Forward gear shim thickness (T1) =
M0 – M
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and 
0.50 mm
Shimming (T50) (for USA and Canada) 
						

							LOWRLower unit
6-7362Y3A11
Shimming (FT50B, FT50C) (for worldwide)6 
						

							62Y3A116-74
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Shimming
NOTE:
Shimming is not required when assembling
the original lower case and inner parts.
Shimming is required when assembling the
original inner parts and a new lower case.
Shimming is required when replacing the
inner part(s).
Selecting the pinion shims
1. Install the drive shaft and drive shaft
bearing 1
 to the shimming tools.
NOTE:
Select the shim thickness (T3) by using the
specified measurement(s) and the calcula-
tion formula.
Install the shimming tool to the drive shaft
so that the shaft is at the center of the hole.
Tighten the wing nuts another 1/4 of a turn
after they contact the fixing plate 2
.
2. Install the pinion and pinion nut, and then
tighten the nut to the specified torque.3. Measure the distance (M) between the
shimming tool and the pinion as shown.
NOTE:
Measure the pinion at three points to find the
clearance average.
4. Calculate the pinion shim thickness (T3)
as shown in the examples below.
NOTE:
“P” is the deviation of the lower case dimen-
sion from standard. The “P” mark a
 is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the “P”
mark is unreadable, assume that “P” is zero
and check the backlash when the unit is
assembled.
Pinion height gauge 3
: 90890-06702
Pinion nut: 95 N·m (9.5 kgf·m, 69 ft·lb)
Digital caliper 4
: 90890-06704
Pinion shim thickness (T3) =
M – 31.50 mm – P/100
Shimming (FT50B, FT50C) (for worldwide) 
						

							LOWRLower unit
6-7562Y3A11
Example:
If “M” is “32.10 mm” and “P” is “+5”, then
T3 = 32.10 – 31.50 – (+5)/100 mm
= 0.60 – 0.05 mm = 0.55 mm
If “M” is “32.10 mm” and “P” is “–5”, then
T3 = 32.10 – 31.50 – (–5)/100 mm
= 0.60 + 0.05 mm = 0.65 mm
5. Select the pinion shim(s) (T3) as follows.
Example:
If “T3” is “0.59 mm”, then the pinion shim is
0.60 mm.
If “T3” is “0.64 mm”, then the pinion shim is
0.65 mm.
Selecting the forward gear shims
1. Turn the taper roller bearing outer race
1
 two or three times to seat the rollers,
and then measure the bearing height (M)
as shown.
NOTE:
Select the shim thickness (T1) by using the
specified measurement(s) and the calcula-
tion formula.
Measure the bearing outer race at three
points to find height average.
2. Calculate the forward gear shim thickness
(T1) as shown in the examples below.
NOTE:
“F” is the deviation of the lower case dimen-
sion from standard. The “F” mark a
 is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the “F”
mark unreadable, assume that “F” is zero
and check the backlash when the unit is
assembled. Calculated numeral 
at 1/100 placeRounded numeral
0, 1 2
2, 3, 4 5
5, 6, 7 8
8, 9 10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and 
0.50 mm
Shimming plate 2
: 90890-06701
Digital caliper 3
: 90890-06704
Forward gear shim thickness (T1) =
24.50 + F/100 – M 
						

							62Y3A116-76
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Example:
If “M” is “24.00 mm” and “F” is “+5”, then
T1 = 24.50 + (+5)/100 – 24.00 mm
= 0.50 + 0.05 mm = 0.55 mm
If “M” is “24.00 mm” and “F” is “–5”, then
T1 = 24.50 + (–5)/100 – 24.00 mm
= 0.50 – 0.05 mm = 0.45 mm
3. Select the forward gear shim(s) (T1) as
follows.
Example:
If “T1” is “0.45 mm”, then the forward gear
shim is 0.42 mm.
If “T1” is “0.50 mm”, then the forward gear
shim is 0.48 mm.Calculated numeral 
at 1/100 placeRounded numeral
1, 2 0
3, 4, 5 2
6, 7, 8 5
9, 10 8
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and 
0.50 mm
Shimming (FT50B, FT50C) (for worldwide) 
						

							LOWRLower unit
6-7762Y3A11
Backlash (T50/FT50B, FT50C)6
Measuring the forward and reverse 
gear backlash
1. Remove the water pump assembly.
2. Set the gearshift to the neutral position.
ÈFor USA and Canada
ÉFor worldwide
3. Install the special service tool so that it
pushes against the propeller shaft.
ÈFor USA and Canada
ÉFor worldwide
NOTE:
Tighten the universal puller or 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 (18 mm [0.71 in] in diameter),
then the dial gauge onto the lower unit.
NOTE:
Install the dial gauge so that the plunger 
a
contacts the mark 
b on the backlash indica-
tor. Shift rod push arm: YB-06052
Shift rod push arm: 90890-06052
Bearing housing puller 1
: YB-06207
Universal puller 2
: YB-06117
Bearing housing puller claw L 3
:
90890-06502
Stopper guide plate 4
: 90890-06501
Center bolt 5
: 90890-06504 
						

							62Y3A116-78
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5. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
6. Add or remove shims if out of specifica-
tion.
M: Measurement
7. Remove the special service tools from
the propeller shaft.
8. Apply a load to the reverse gear by install-
ing the propeller 0
 without the spacer A
,
and washer B
 and washer C
 as shown.
NOTE:
Tighten the propeller nut D
 while turning the
drive shaft until the drive shaft can no longer
be turned.
9. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
10. Check the pinion shim if out of specifica-
tion.
11. Remove the special service tools, and
then install the water pump assembly. Backlash indicator gauge 6
: YB-06265
Backlash indicator 6
: 90890-06706
Magnetic plate 7
: YB-07003
Magnet base plate 7
: 90890-07003
Dial gauge 8
: YU-03097
Dial gauge set 8
: 90890-01252
Magnet flexible stand 9
: YU-34481
Magnet base 9
: 90890-06705
Forward gear backlash:
0.12–0.45 mm (0.005–0.018 in)
Forward gear 
backlashShim thickness
Less than
0.12 mm (0.005 in)To be decreased by 
(0.29 – M) ×
 0.57
More than
0.45 mm (0.018 in)To be increased by 
(M – 0.29) ×
 0.57
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and 
0.50 mm
Reverse gear backlash:
0.71–1.11 mm (0.028–0.044 in)
Backlash (T50/FT50B, FT50C) 
						

							BRKT
62Y3A11
Bracket unit
Troubleshooting ............................................................................................. 7-1
Special service tools ..................................................................................... 7-4
Tiller handle (F50/F50A, T50/FT50B) ............................................................ 7-5
Checking the throttle cable and shift cable .............................................. 7-15
Assembling the tiller handle..................................................................... 7-15
Tiller handle (FT50C).................................................................................... 7-17
Checking the throttle cable and shift rod ................................................. 7-23
Assembling the tiller handle..................................................................... 7-23
Lubricating the throttle gear ..................................................................... 7-23
Bottom cowling ............................................................................................ 7-25
Checking the shift rod assembly operation.............................................. 7-29
Upper case .................................................................................................... 7-31
Disassembling the oil pan........................................................................ 7-39
Checking the oil strainer and the relief valve ........................................... 7-39
Assembling the oil pan ............................................................................ 7-39
Installing the upper case.......................................................................... 7-41
Clamp brackets ............................................................................................ 7-43
Removing the clamp brackets ................................................................. 7-45
Installing the clamp brackets ................................................................... 7-45
Adjusting the trim sensor ......................................................................... 7-46
Swivel bracket and steering arm ................................................................ 7-47
Removing the steering arm ..................................................................... 7-49
Installing the steering arm ....................................................................... 7-49
Power trim and tilt unit ................................................................................ 7-51
Removing the power trim and tilt/hydro tilt .............................................. 7-53
Tilt cylinder and trim cylinder ..................................................................... 7-55
Trim cylinder ................................................................................................ 7-57 
						

							62Y3A11
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Gear pump .................................................................................................... 7-59
Disassembling the tilt cylinder ................................................................. 7-63
Disassembling the trim cylinder ............................................................... 7-63
Disassembling the gear pump ................................................................. 7-64
Checking the tilt cylinder and trim cylinder .............................................. 7-64
Check the valves ..................................................................................... 7-65
Checking the filters .................................................................................. 7-65
Checking the gear pump ......................................................................... 7-66
Assembling the gear pump ...................................................................... 7-66
Assembling the trim cylinder.................................................................... 7-67
Assembling the tilt cylinder ...................................................................... 7-69
Bleeding the power trim and tilt (not installed)......................................... 7-70
Bleeding the power trim and tilt (built-in) ................................................. 7-71
Power trim and tilt motor............................................................................. 7-73
Checking the power trim and tilt motor .................................................... 7-75
Assembling the power trim and tilt motor ................................................ 7-76
Installing the power trim and tilt ............................................................... 7-76
Power trim and tilt electrical system .......................................................... 7-78
Checking the fuse .................................................................................... 7-79
Checking the power trim and tilt relay ..................................................... 7-79
Checking the power trim and tilt switch/trailer switch .............................. 7-80
Checking the trim sensor ......................................................................... 7-80 
						

							BRKTBracket unit
7-162Y3A11
Troubleshooting7
Before troubleshooting the power trim and tilt unit, check that all electrical connections are tight and
free from corrosion, and that the battery is fully charged to 12 V.
Symptom: Power trim and tilt unit does not operate.
Listen for the operation sound 
of the power trim and tilt relay.
Listen for the operation sound 
of the power trim and tilt motor.
Check that the manual release 
plug is closed.
Check the power trim and tilt 
fluid level.
Disassemble the power trim and 
tilt unit, and then check it.
Check the power trim and tilt 
motor.
Replace the power trim and tilt 
relay.
Close the plug.
Add fluid to the correct level.At specified 
level?
Can 12 V be 
obtained?
Can 12 V be 
obtained?
Can the oper-
ation sound 
be heard?
Can the oper-
ation sound 
be heard?
Replace the power 
trim and tilt relay.
Check for continuity 
between the battery, 
relay, and switch.
Check the voltage between the 
sky blue (Sb) lead and black (B) 
lead.
Check the voltage between each terminal.
Between the sky blue (Sb) lead and black (B) lead.
Between the light green (Lg) lead and black (B) lead.
Is it closed?
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Yes