RADIATOR COOLED
SYSTEM
On radiator cooled models (Figure 6), the water
pump draws cooled water from the radiator through
the bottom hose and forces it into the cylinder water
jacket at the front of the engine. The water circulates
through the cylinder water jacket up through the
cylinder heads to the thermostat and flows through
the outlet hose into the top of the radiator.
It
circu-
lates down through the radiator while the fan blows
cooling air across the radiator. The water is drawn
from the bottom of the radiator by the pump to be
recirculated.
Water Pump
A
centrifugal type water pump (Figure 6a) circulates
coolant through cooling system. The water pump is
secured to cylinder block with capscrews and is belt
driven from the crankshaft pulley. Coolant is drawn
through pump inlet opening by the impeller and
forced through outlet opening in backside of pump
into cylinder block.
A
gasket on water pump outlet
assures a leakproof connection.
PUMP
BY-PASS
LINE
I
WATER
PUM,P
HOUSING
GASKET
FIGURE
6a.
WATER PUMP-EXPLODED VIEW
LEGEND
-
-
WATER FLOW, ENGINE COOLING
-AIR FLOW. ENGINE VENTllATlON
FIGURE
6.
RADIATOR
COOLING SYSTEM
During engine, warmup, when the thermostat is
closed, the water bypasses the radiator.
It
flows
through a bypass line from the water outlet housing
to the pump and recirculates through the engine.
When water in the e.ngine block reaches normal
operating temperature, the thermostat opens. This
permits heated water to flow into the radiator to be
cooled.
Recirculation ensures both rapid and even tempera-
ture increase of all engine parts during warmup.
Ventilation for radiator cooled models requires an
inlet opening for fresh air and an outlet opening for
hated air to prevent recirculation
of
heated air. The
openings should be at least the size of the radiator.
An expansion area in fhe closed
cooling system maintains proper
coolant level
by
prevenfing overflow and loss of cool-
ant when engine heats up.
The water pump is constructed to provide long life
with a minimum amount of attention when proper
corrosion preventive coolant is used. Care must be
taken to keep grit and abrasive material from being
circulated through cooling system. Water containing
scale-forming materials is especially harmful to pump
parts.
The pump cannot be rebuilt and must be replaced as
a unit. Check condition of bearing and shaft assem-
bly by turning water pump pulley. If bearing feels
rough or binds, seal is leaking, or housing is cracked,
the pump must be replaced.
Removal and Installation
1.
2.
3.
4.
5.
6.
7.
8.
9.
Drain cooling system at radiator and engine
block.
Remove housing from radiator as necessary.
Disconnect both hoses from radiator.
Remove radiator.
Loosen fan belt.
Remove fan and water pump pulley.
Disconnect by-pass line and radiator lower hose
from pump.
Remove water pump from water pump housing.
Installation is the reverse
of
removal.
18
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