Removing The Lower Unit; Checking The Propeller; Checking The Lower Unit Anode - Yamaha F30B 2018 Service Manual

Removing the lower unit

• Make sure to disconnect the battery ca-
bles from the battery, and remove the clip
from the engine shut-off switch.
• When removing the lower unit with the
power unit installed, make sure to sus-
pend the outboard motor. Otherwise, the
outboard motor could fall suddenly and
result in severe injuries.
• When loosening or tightening the propel-
ler nut, do not hold the propeller using
your hands.
TIP:
When disassembling the lower unit, measure
the backlash before disassembly. See "Mea-
suring the forward gear backlash and reverse
gear backlash before disassembly" (8-27).
1. Drain:
• Gear oil
See step 1 in "Changing the gear oil" (10-
18).
2. Set the gear shift to the N position.
3. Remove:
• Propeller nut
TIP:
Place a block of wood between the anti-cavita-
tion plate and the propeller to prevent the pro-
peller from turning.
4. Remove:
• Trim tab bolt
• Trim tab
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Mark the trim tab "1" and lower case with
an identification mark "a", and then remove
the trim tab "1".
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
5. Remove:
• Lower case mounting bolt "2"
• Lower case mounting bolt "3"
• Speedometer hose "4"
• Anode "5"
4
2

Checking the propeller

1. Check:
• Propeller blade
• Spline
• Cracked/damaged/worn  Replace the
propeller.

Checking the lower unit anode

1. Check:
• Trim tab
Eroded (1/2 or more)  Replace.
There is grease, oil, or scales.  Clean.
Do not apply grease, oil, or paint to the trim
tab.
8-2
Lower unit
5
1
3
a
2