SECTION 3 – LUBRICATION AND MAINTENANCE
3-18
Thermostat
The thermostat is a heat-sensitive valve located
in the coolant outlet connection in the front of the
cylinder head.
When the engine is cold, the thermostat shuts off
the flow of coolant to the radiator, allowing for
rapid engine warm-up. A recirculating bypass
allows coolant to circulate inside the engine
whenever the thermostat shuts off flow to the
radiator.
IMPORTANT: Do not attempt to improve
cooling by removing the thermostat. This will
cause the engine to run below normal
working temperatures, resulting in excessive
engine wear.
To install a new thermostat ① position it in the
recess of the water outlet connection so that the
heat element (spring end) is in the cylinder head
of the engine.
Fan Belt
NOTE: Check the condition of the fan beIt after
every 50 hours of operation. Check fan belt
tension after every 200 hours of operation.
A belt-driven fan located at the front of the
engine draws air through the fins of the radiator
to lower the temperature of the radiator coolant.
When 5 kg of thumb pressure is applied to the
belt midway between the belt pulleys, a correctly
tightened belt will deflect 5 - 10 mm.
If the fan belt is slipping, fan efficiency is lowered,
resulting in the engine running too hot. If the belt
is too tight, the life of the alternator bearing will
be shortened. If the fan belt shows signs of
cracking or fraying, install a new belt.
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