Lower Unit; Checking The Gear Oil Level; Replacing The Gear Oil - Yamaha F15B Service Manual

2. Fully tilt the outboard motor up, then sup-
port it with the tilt support lever 1 to
check the lock mechanism of the lever.
1

Lower unit

Checking the gear oil level

1. Fully tilt the outboard motor down.
2. Remove the check screw 1, then check
the gear oil level in the lower case.
NOTE:
The gear oil level should be at the brim of the
check hole.
3. If necessary, add sufficient gear oil of the
recommended type to the correct level.
Recommended gear oil:
Hypoid gear oil
SAE: 90
4. Install the check screw, then tighten it to
the specified torque.
Check screw:
9 N·m (0.9 kgf·m, 6.6 ft·lb)
6D45F11
6D430290
1
6D430300
Control system/Bracket/Lower unit

Replacing the gear oil

1. Fully tilt the outboard motor down.
2. Place a drain pan under the drain screw
1, remove the drain screw, then the
check screw 2 to drain the oil.
3. Check the oil for metal, discoloration, and
viscosity. Check the internal parts of the
lower case if necessary.
4. Insert the gear oil tube into the drain hole
and slowly fill the gear oil until oil flows
out of the check hole and no air bubbles
are visible.
Recommended gear oil:
Hypoid gear oil
SAE: 90
Oil quantity:
0.25 L (8.45 US oz, 8.82 Imp oz)
1
2
2
3
1
4
6D430310 5
6
7
8
6D430320
9
3-12