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,...

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...

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...

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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...

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...

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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...

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...

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...

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...