Yamaha F150B, Service Manual

Page: 433 / 458

10-10
General Periodic Maintenance
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A
Checking the cooling water passage
1. Remove the cooling water inlet covers
a
and trim tab
b
.
2. Check the cooling water inlet covers and
cooling water inlets. Clean if clogged.
TIP:
Mark
a
the trim tab
b
at the area shown,
and then remove it.
3. Install the cooling water inlet covers
a
and trim tab
b
, and then tighten the
screw
c
and bolt
d
to the specified
torque.
4. Place the lower unit in water, and then
start the engine.
5. Check for water flow at the cooling water
pilot hole. If there is no water flow, check
the cooling water passage inside the
outboard motor.
Checking the engine idle speed
1. Start the engine and warm up until the
engine idle speed is stable at 650–750 r/
min.
2. Check the engine idle speed using the
Yamaha genuine tachometer (on-board
meter) or using the YDIS. To connect and
operate the YDIS, see the YDIS (Ver.
1.30 or later) Instruction Manual.
Checking the engine oil level
1. Check the engine oil level. See “Check-
ing the engine oil level” (10-5).
Changing the engine oil
Change the engine oil after the first 20
hours of operation or 3 months, and every
100 hours or at 1-year intervals thereafter.
Otherwise the engine will wear quickly.
The engine oil should be extracted with an oil
changer.
1.
Put the outboard motor in an upright
position (not tilted).
NOTICE: If the out-
board motor is not level, the oil level
indicated on the dipstick may not be
accurate.
2. Start the engine. Warm it up and keep
the idle speed for 5–10 minutes.
3. Stop the engine and leave it for 5–10
minutes.
4. Remove the top cowling.
Cooling water inlet cover screw
c
:
5 N·m (0.5 kgf·m, 3.7 ft·lb)
Trim tab bolt
d
:
42 N·m (4.2 kgf·m, 31.0 ft·lb)
a
c
d
a
b
a