Yamaha F50 Service Manual

62Y3A115-64
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6. If the oil clearance is below specification,
check the connecting rod bearing color
and clean the contact surface of the con-
necting rod and the connecting rod bear-
ing, and then check the crank pin oil
clearance again.
7. If the oil clearance is over specification,
install an over-sized connecting rod bear-
ing, and then check the crank pin oil
clearance again.
Assembling the cylinder body
1. Assemble the piston 1
, connecting rod
2
, piston pin 3
, and piston pin...

POWRPower unit
5-6562Y3A11
5. Install the piston with the “UP” mark on
the piston crown facing towards the fly-
wheel.
ÈFor USA and Canada
ÉFor worldwide
NOTE:
Apply engine oil to side of the piston assem-
bly.
6. Install half of the bearings 9
 into the cyl-
inder body 0
.
NOTE:
Insert the projection 
f of the bearing into the
notch in the cylinder body.7. Set the crankshaft A
, and oil seals B
and C
 into the cylinder body as shown.
Apply engine oil to the inner oil seal, jour-
nal bearings, and...

62Y3A115-66
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NOTE:
Align the alignment marks g
 on the connect-
ing rod cap and connecting rod.
9. Install half of the bearings 9
 into the
crankcase, then dowel pins E
.
10. Apply Gasket Maker
® to the mating sur-
face of the crankcase.
NOTE:
Insert the projection h
 of the bearing into
the notch in the crankcase.
Do not get any Gasket Maker on the journal
bearings.
11. Install the crankcase bolts, and then
tighten them to the specified torques in
two stages and in the sequence...

POWRPower unit
5-6762Y3A11
12. Install the new gasket and exhaust cover,
and then tighten the bolts to the specified
torques in two stages and in the
sequence shown.
Installing the power unit
1. Install the dowel pins 1
 and gasket 2
.
2. Install the power unit 3
 by installing the
bolts 4
, then tightening them to the
specified torque.3. Install the apron 5
. Exhaust cover bolt:
1st: 6 N·m (0.6 kgf·m, 4.3 ft·lb)
2nd: 12 N·m (1.2 kgf·m, 8.7 ft·lb)
Mounting bolt 4
:
21 N·m (2.1 kgf·m, 15 ft·lb) 

62Y3A115-68
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4. Install the shift rod bolts 6
, shift rod 7
and power trim and tilt relay 8
.
5. Connect the flushing hose (models with
flushing device), pilot water hose 9
,
trailer switch coupler 0
 (EHT, ET), warn-
ing indicator coupler A
 (EHD, EHT),
ground lead B
 (EHT, ET), PTT motor
leads C
 (EHT, ET), PTT relay leads D
(EHT, ET), 10-pin coupler E
, and battery
leads F
.6. Connect the throttle link rod G
 and fuel
hose H
.
7. Connect the shift cable/shift rod I
 and
throttle cable...

POWRPower unit
5-6962Y3A11
8. Install the Woodruff key.
9. Install the flywheel magnet and flywheel
magnet cover.
ÈFor USA and Canada
ÉFor worldwide
CAUTION:
Apply force in the direction of the arrows
shown, to prevent the flywheel holder
from slipping off easily.
NOTE:
Apply engine oil to the flywheel magnet nut
before installation.
Flywheel magnet holder: YB-06139
Flywheel holder: 90890-06522
Flywheel magnet nut:
160 N·m (16 kgf·m, 116 ft·lb) 

62Y3A115-70
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— MEMO — 

LOWR
62Y3A11
Lower unit
Special service tools ..................................................................................... 6-1
Lower unit (F50/F50A).................................................................................... 6-7
Removing the lower unit ............................................................................ 6-9
Water pump and propeller shaft housing (F50/F50A)............................... 6-11
Removing the water pump and propeller shaft housing assembly .............

62Y3A11
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Backlash (F50/F50A) .................................................................................... 6-39
Measuring the forward and reverse gear backlash ................................. 6-39
Lower unit (T50/FT50B, FT50C) .................................................................. 6-41
Removing the lower unit .......................................................................... 6-43
Water pump and shift rod (T50/FT50B, FT50C)...

LOWRLower unit
6-162Y3A11
Special service tools6
Bearing housing puller
YB-06207, YB-06234
Universal puller
YB-06117
Slide hammer and adapters
YB-06096
Bearing housing needle bearing remover
YB-06112, YB-06153
Driver handle
YB-06071Bearing housing needle bearing installer
YB-06111
Oil seal installer
YB-06168
Forward/reverse gear bearing installer
YB-06270-A
Bearing cup installer
YB-06167
Drive shaft holder
YB-06049
For USA and Canada