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ENGINE
COOLING SYSTEM
Thermostat
~==
Radiator
Schematic
coolant
circuit
diagram
WATER PUMP
Construction
Engine coolant
is
set in recirculation by the
water pump, a centrifugal
pump
mounted
on the
front end
of
cylinder block. The
pump
casing,
shaped like a bracket, is bolted
to
the front end
of
cylinder block and, by its protruding end,
holds the pump shaft through a double-row ball
bearing. The inner portion
of
the shaft carries
the pump impeller and the
outer
portion,
outside
of
the casing, carries a bracket, to which
the cooling fan
hub
and pulley are bolted.
The space between the two rows
of
balls,
surrounded by the casing,
is
filled with grease:
there
is
no need
to
give
lubricating attention to
this bearing. A seal unit
is
fitted to the shaft,
right next to the bearing,
to
isolate the coolant
space from the grease-filled space.
Bracket
Seal
unit
aiiiiiilli
Water
pump
- Cross
section
Removal
(1) Drain the coolant space
of
the engine by
opening the drain cock, located on the
left-hand side
of
the cylinder block.
(2) Disconnect water hoses from the pump.
(3) Remove fan belt.
(4) Remove cooling fan.
(5) Remove the mounting bolts and take down
the pump.
2·45
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