Cooling
System
Malfunctions -
Diagnosis
Page
7-6
Cooling
System
DODGE
Turbo
Diesel
©
The
pump is belt driven
from
the crankshaft pulley. An
automatic belt tensioner Is
used
to prevent the belt
from
slipping
on the pump pulley. A malfunction of the
tensioner
will
cause
the water pump impeller to
rotate
at a slower speed
reducing
the amount of coolant flow.
^ ] The coolant flow can
also
be reduced if the inlet
hose
to the
water pump
collapses.
A
hose
will usually not
collapse
while
the engine Is running at low
speed.
Check
the
hose
while the
engine
is
running at rated
speed.
Note:
Be
sure
the engine
is
warm,
a minimum of 83°C I181°F],
so
the thermostat
is
open.
A
worn or malfunctioning water pump will not
produce
the flow
required to prevent the engine
from
running hot. However, be
sure
to
check
the other possibilities indicated in the
Troubleshooting
Logic
before
checking
the flow or replacing
the pump.
As
stated in the coolant
discussion,
an obstruction in the
passages
can
interrupt flow.
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