Maintenance
59
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.
[ECM00714]
TIP:
For disposal of used gear oil, consult your Yamaha dealer.
6.
Remove any metal particles on the magnetic gear oil
drain bolt.
NOTICE:
If there is an excessive quantity
of metal particles 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 installation.
8.
Remove the oil filler bolt and O-ring.
9.
Place the outboard motor in a vertical position. Using a
flexible or pressurized filling device, inject the gear oil
into the oil filler bolt hole.
10. Put a new O-ring on the oil level plug. When the gear oil
begins to flow out of the oil level plug hole, insert and
tighten the oil level plug to the specified torque.
TIP:
Apply a light coat of gear oil to the oil level plug thread and
O-ring before installation.
11. Put a new O-ring on the oil filler bolt. Insert and tighten
the oil filler bolt to the specified torque.
TIP:
Apply a light coat of gear oil to the oil filler bolt thread and O-
ring before installation.
12. Install the cooling water inlet covers on both sides of the
lower unit, and then tighten the bolts to the specified
torque.
1. Gear oil drain bolt
2. O-ring
1. Oil level plug
2. O-ring
Tightening torque:
3.0 N·m (0.30 kgf·m, 2.2 lb·ft)
1
2
1 2
1. Oil filler bolt
2. O-ring
Recommended gear oil:
Yamalube Marine Gearcase Lube HD
or Hypoid gear oil
Recommended gear oil grade:
SAE 80W API GL-5 / SAE 90 API GL-
5
Gear oil quantity:
1.830 L (1.934 US qt, 1.610 Imp.qt)
(LF375SA, LF425SA)
1.950 L (2.061 US qt, 1.716 Imp.qt)
(F375SA, F425SA)
Tightening torque:
3.0 N·m (0.30 kgf·m, 2.2 lb·ft)
Tightening torque:
3.0 N·m (0.30 kgf·m, 2.2 lb·ft)
1
2
U6GR30E0.book Page 59 Thursday, April 12, 2018 9:28 AM
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2019 Yamaha Motor Corporation, U.S.A.
