Yanmar 4JH45 Operation Manual page 49

12/05
1. Ensure all drain cocks are closed.
Note: The drain cocks are opened
before shipping from the factory.
Marine gear ZF25A does not
have a drain cock on the clutch
cooler.
2. Loosen the filler cap of coolant tank to
relieve the pressure, then remove the
filler cap.
WARNING
Burn Hazard.
Never remove the coolant filler cap if
the engine is hot. Steam and hot
engine coolant will spray out and
seriously burn you. Allow the engine
to cool down before you attempt to
remove the cap.
Figure 3
1
2
3
4
Figure 12
1 – Filler Cap Tabs
2 – Coolant Filler Cap
3 – Filler Port Notches
4 – Coolant Tank
3. Pour coolant slowly into coolant tank
(Figure 12, (4)) to avoid air bubbles.
Fill until coolant overflows from the filler
port.
054746-00X00
JH Series Operation Manual
BEFORE YOU OPERATE
Never pour cold coolant into a hot
engine.
4. Align filler cap tabs (Figure 12, (1))
with filler port notches (Figure 12, (3))
and tighten filler cap (Figure 12, (2))
firmly.
Always tighten coolant tank cap securely
after checking coolant tank. Steam can
spray out during engine operation if the
cap is loose.
Note: The coolant level rises in the
reservoir during operation. After
stopping the engine, the coolant
will cool down and the extra
coolant will return to coolant
tank.
(1)
(2)
(3)
Figure 13
5. Check the coolant level in the reservoir.
The level should be at the FULL mark
(Figure 13, (2)). Add coolant if
necessary.
(4)
FULL
LOW
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