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Page 20
Engine -
Cooling
COOLANT LEVEL
The coolant level should be checked daily as a matter of routine.
ONLY EVER INSPECTCOOLANTWHEN THE ENGINE IS
COMPLETELY COLD. To check level, follow this procedure:
• Check the coolant level in the sub-tank. If the level is close to
the lower limit, remove the sub-tank cap and fill with coolant
to the upper limit.
• Remove the radiator cap and check the amount of coolant in
the radiator. Fill with coolant to the overflow if the level
is low.
Check the difference of the cooling water level before and after
operation once a week. Before operation when the engine is cold
there should be a low level of coolant. Immediately after
operation (when the engine is hot) there should be a high level of
coolant. If there is no difference in coolant level before and after
the engine operation open the radiator cap and check the coolant
volume. Also check the hose linking the radiator and the sub tank
to make sure that it is not disconnected, loosened or torn. Check
that the hose is inserted to the lower level of the sub-tank (when
engine is cold).
COOLING WATER REPLACEMENT
- CAUTION -
Change the cooling water when the engine is fully cold to
prevent scalding. Never open the radiator cap whilst the
engine is hot, this may result in scalding steam and a
hot water blow-out.
To change coolant, follow this procedure:
• Position a can to collect the waste fluid.
• Turn the radiator cap anti-clockwise for 90º without pressing it
downward.
• Press the cap downward and continue to turn it anti-clockwise
to remove. If forcibly turned the cap may become damaged.
• Disconnect the hose between the coolant pump and the
radiator out of the cooling pump side. When the coolant is
fully drained, reconnect the coolant rubber hose.
• Add coolant whilst bleeding air by pinching or tapping the
coolant rubber hose.
• Fill coolant to the upper limit of the sub tank.
• Operate the engine at no-load for about 5 minutes and check
for any fluid leakage.
• Check the sub-tank coolant level about 5 minutes after
stopping engine and replenish as required.
TI
GHTEN
R
E
M OVE SL
O
W
L
Y
LOW
FULL
fig 1
fig 2
fig 3
Check coolant
level by examining
the sub-tank. The
Liquid should be
visible through the
white plastic tank.
Radiator
Cap
Radiator
Filling
Sub-Tank
Summary of Contents for D18/50
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