Yamaha F90D - Lower Unit and General Checks

6D81G11
3-12
1
2
3
4
5
6
7
8
9
Lower unit
3
Checking the gear oil level
1. Fully tilt the outboard motor down.
2. Remove the check screw
1
, and then
check the gear oil level in the lower case.
NOTE:
If the oil is at the correct level, the oil should
overflow out of the check hole when the
check screw is removed.
3. If necessary, add sufficient gear oil of the
recommended type until it overflows out
of the check hole.
4. Install the check screw, and then tighten
it to the specified torque.
Changing the gear oil
1. Tilt the outboard motor up slightly.
2. Place a drain pan under the drain screw
1
, remove the drain screw, then the
check screw
2
and let the oil drain com-
pletely.
3. Check the oil for metal and discoloration,
and its viscosity. Check the internal parts
of the lower case if necessary.
Recommended gear oil:
GEAR CASE LUBE
SAE: 90
T
R
.
.
Gear oil check screw:
9 N·m (0.9 kgf·m, 6.6 ft·lb)
S60C3540
1
Bracket unit / Lower unit