LUBRICATION AND MAINTENANCE
41
4. Clean the radiator cap and cap seal. Install the
cap.
5. Clean the radiator front screen, Figure 60.
6. Run the engine until normal operating tempera-
ture is reached, then stop the engine and re-
check the coolant level. Add coolant as re-
quired.
IMPORTANT ：
：：
： Never run the engine when the
cooling system is empty, and do not add cold water
or cold antifreeze solution if the engine is hot.
Thermostat ：
：：
： The thermostat is located in the
coolant outlet connection in the front of the cylinder
head, Figure 61.
Figure 61 - Thermostat Housing
When the engine is cold, the thermostat, which is a
head sensitive valve, shuts off the flow of coolant to
the radiator, thus allowing rapid engine warm up.
A recirculating bypass allows the coolant to circu-
late within the engine whenever the thermostat
shuts off flow to the radiator.
IMPORTANT：
：：
：Do not remove the thermostat in an
attempt to improve the cooling. This will cause the
engine to run below normal working temperatures,
resulting in excessive engine wear.
If it ever becomes necessary to install a new ther-
mostat, it should be positioned in the recess of the
water outlet connection so that the heat ele-
ment(spring end)will be in the cylinder head of the
engine.
Fan Belt：
：：
：A belt-driven fan at the front of the en-
gine draws air through the fins of the radiator to
cool the coolant in the radiator. A slipping fan belt
will lower the efficiency of the fan, resulting in the
engine running too hot. If the belt is too tight, it will
shorten the alternator bearing life. A correctly
tightened belt will deflect 10 to 15 mm(7/16 to 9/16
inch) when 9 to 11 kg (20 to 25 pounds) thumb
pressure is applied midway between the belt pul-
leys. Check the condition and tension of the fan
belt every 200 hours. If the belt shows signs of
cracking or fraying, install a new belt.
To Adjust Belt Tension :
1. Loosen the alternator mounting bolts, Figure 62.
Figure 62 - Alternator Mounting Bolts
WARNING：
：：
：Never attempt to loosen or
tighten the bolts when the engine is
running.
2. Pry the alternator away from the engine and
tighten the mounting bolts.
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