Yamaha F400A Owner's Manual page 88

Maintenance
 Never get under the lower unit while it is
tilted. Severe injury could occur if the
outboard motor accidentally falls.
Before filling the lower unit with gear oil, the
outboard motor must be placed in a vertical
position. If you are not able to place the out-
board motor in a vertical position, have a
Yamaha dealer change the gear oil.
(1) Tilt the outboard motor so that the gear
oil drain bolt is at the lowest point possi-
ble.
(2) Place a suitable container under the low-
er unit.
(3) Loosen the bolts, and then remove the
cooling water inlet covers on both sides
of the lower unit.
1
2
1. Bolt
2. Cooling water inlet cover
(4) Remove the gear oil drain bolt and O-
ring.
1 2
1. Gear oil drain bolt
82
2
1
2. O-ring
(5) Remove the oil level plug and O-ring to
allow the gear oil to drain completely.
NOTICE: Check the used gear oil after
it has been drained. If the gear oil is
milky or contains water or a large
amount of metal particles, the gear
case may be damaged. Have a
Yamaha dealer check and repair the
outboard motor.
TIP:
For disposal of used gear oil, consult your
Yamaha dealer.
1 2
2
2
1. Oil level plug
2. O-ring
(6) Remove any metal particles on the mag-
netic gear oil drain bolt. NOTICE: If there
is an excessive quantity of metal par-
ticles on the magnetic gear oil drain
screw, this can indicate lower unit
problem. Consult your Yamaha dealer.
[ECM01901]
(7) Put a new O-ring on the gear oil drain
bolt. Insert and tighten the gear oil drain
bolt to the specified torque.
TIP:
Apply a light coat of gear oil to the gear oil
drain bolt thread and O-ring before installa-
tion.
[ECM00714]