Lower Unit; Gear Oil; Lower Unit Leakage Check - Yamaha 40V Service Manual

INSP
ADJ

LOWER UNIT

LOWER UNIT

Gear oil

1. Check:
Gear oil
Milky oil → Replace the oil seal.
Slag oil → Check the gear, bearing
and dog.
2. Check:
Gear oil level
Oil level is low → Add oil to proper
level.
3. Replace:
Gear oil
Replacement steps:
Tilt up the motor.
Place a pan under the drain plug 1.
Remove the drain plug, then the oil
level plug 2 and drain the oil thor-
oughly.
Place the outboard motor in an upright
position.
Fill the gear oil through the drain hole
until it overflows at the level hole.
Recommended oil:
GEAR CASE LUBE (USA) or
Hypoid gear oil, SAE #90
Oil capacity:
430 cm
Refit the oil level plug and then oil
drain plug.

Lower unit leakage check

1. Check:
Pressure holding
Pressure falls → Inspect seals and
component parts.
Checking steps:
Attach the tester to the oil-level hole.
Pressure tester:
YB-35956/90890-06762
Apply the specified pressure.
Pressure:
100 kPa (1.0 kg/cm
Check that the pressure is held as
specified for 10 seconds.
3-8
3
(14.5 US oz,15.1 Imp oz)
2
, 14.2 psi)
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