SM01-002-0
Page 8
Water Pump.
WARNING
The pump should be checked carefully for leaks
Whe removing the cap, loosen it
and proper lubrication, and if leaking, cracked, or
slowly and then pause a moment.
worn, it should be rebuilt or replaced promptly.
This will avoid possible burning by hot
water or steam. Continue to turn
Fans and Belts.
the cap to the left until it can be
removed.
The fan should be checked for loose or bent
blades. A loose blade might work free during
4. Tubes. Because these are v ery small they can
operation and cause damage.
become easily clogged, or partially so, by rust and
scale. The general condition of the cooling system
A bent blade could cause an imbalance and cause
and operating temperature are indications as to
the water pump to fail prematurely, and it will
whether or not tubes are clean. Another good test
reduce the fan's efficiency.
is to feel the core for cold spots.
Refer to the engine manual for your particular engine
5. Fins. These thin metal sheets dissipate heat
for fan and other belt adjustment specifications.
picked up by the tubes. They should be kept free
of bugs, leav es, straw etc., so as to allow the free
When one belt of dual driv es is damaged or worn,
passage of air. Bent fins should be straightened.
they must both be changed as a matched pair.
Engine Water Jacket.
Thermostat.
The water jacket permits coolant to be circulated
Thermostats used in these carriers are of the non-
around the cylinder walls, combustion chamber,
adjustable type and are incorporated in the cooling
and v alv e assemblies. Some of these coolant
system for the purpose of retarding or restricting the
passages are small and can easily become
circulation of coolant during engine warm up. Engine
clogged, if the cooling system does not receiv e the
overheating and loss of coolant is sometimes due to
proper maintenance.
an inoperative thermostat. To check for this condition,
remove the thermostat and test by submerging it in hot
water and noting the temperature at which the
1. Core Plugs. These are sometimes mistakenly
thermostat opens and closes. Use an accurate high
called freeze plugs. They do not prov ide protection
temperature thermometer for making this test.
against freezing expansion, but are only present
because of engine block casting methods. Remov e
Hose and Clamps.
and replace core plugs that show signs of leaking
or rusting through. Use an installation tool for core
Hoses and their connections must be checked
plug replacement.
regularly because they are often the source of
hidden trouble. Hoses may often times appear in
2. Drain Plugs. The water jacket of each engine
good condition on the outside while the inside will be
has one or more drain plugs. These should receiv e
partially deteriorated. If there are any doubts about a
seasonal care and kept free of rust and scale.
hose doing its job, replacement should be made.
The clamps should be inspected to make sure they
3. Gaskets. Gaskets must be in good condition to
are strong enough to hold a tight connection.
prev ent both internal and external leaks. If there
are external leaks around gaskets, there may also
TEST EQUIPMENT.
be internal leaks into the engine. Proper tightening
of the head bolts with a torque wrench is essential
The hydrometer is a primary aid in maintaining the
for prev enting leaks around the head gasket.
cooling system at top efficiency. Hydrometers, which are
used to test the freezing protection of an anti-freeze
