Yamaha F20A, Service Manual

Page: 78 / 444

3-8
INSP
ADJ
E
LOWER UNIT
3. Replace:
●
Gear oil
Lower unit leakage check
1. Check:
●
Pressure
Pressure drops
→
Inspect the seals
and components.
NOTE:
Do not overpressurize the lower unit since
excessive pressure may cause the air to
leak out.
Replacement steps:
●
Tilt up the outboard slightly.
●
Place a container under the gear oil
drain screw
1 .
●
Remove the drain screw, the check
screw
2 , and then drain the gear oil.
●
Place the outboard in an upright posi-
tion.
●
Add gear oil through the drain hole
until it overflows from the check hole.
Recommended gear oil:
GEAR CASE LUBE (USA) or
Hypoid gear oil, SAE 90
Total amount:
320 cm
3
(10.8 US oz, 11.3 Imp oz)
●
Install the check screw and then the
drain screw.
Checking steps:
●
Connect the pressure tester to the gear
oil level check hole.
Pressure tester:
YB-03595/90890-06762
●
Apply the specified pressure.
Pressure:
100 kPa (1.0 kg/cm
2
, 14.2 psi)
●
Check that the lower unit holds the
specified pressure for ten seconds.