General Information - Briggs & Stratton Vanguard 430000 User Manual

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THERMOSTAT CLOSED

General Information

Briggs & Stratton Daihatsu gasoline and diesel
engines use a pressurized, forced circulation
cooling system.
The water pump circulates coolant through the
cylinder block, cylinder head, intake manifold, and
radiator. The thermostat maintains optimum engine
temperature.
The thermostat is equipped with a by-pass valve
which permits coolant to re-circulate through the
cylinder block, cylinder head, and pre-heat the
intake manifold. Pre-heating the intake manifold
promotes fuel and air mixture efficiency when the
engine is cold.
As the engine warms, the by-pass valve closes as
the thermostat opens, permitting complete
circulation through the radiator.
Always maintain a 50% solution of phosphate free
antifreeze at all times for adequate heat dissipation,
lubrication, and protection from freezing.
146
THERMOSTAT OPEN
WARNING
The cooling system is pressurized. Do not
remove the radiator cap while the engine is
hot. To avoid scalding hot coolant or steam
blowing out of the radiator, use extreme care
when removing the radiator cap. If possible,
wait for engine to cool. Wrap a thick rag
around the cap while removing. To release
pressure, slowly turn cap counterclockwise to
the first stop. When all pressure has been
released, press down on cap and continue
turning.
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