C-Series Book - Industrial Engine Service

3
When the pressure-condensing cooling
system is used in climates with freezing
temperatures, a mixture of anti-freeze and
water must be used. A good grade of antifreeze
should be mixed with water before
pouring into the engine. Usually 50-50 mix
is very suffi cient. Never use less than 40%
water in a pressure-condensing cooling
system.
WARNING:
DO NOT ATTEMPT TO FILL THE
COOLING SYSTEM WHILE THE
ENGINE IS RUNNING.
Since this system operates at 4 pounds
pressure, steam and water escape when
the cap is removed. Do not remove the cap
while the engine is running. Before stopping
the engine, let it run a few minutes with the
clutch disengaged to reduce pressure so
the cap may be removed with safety.
The coolant level should be checked on a
regular basis to be assured no leaks have
occurred. The coolant level is 1" below
the bottom header plate in the condenser
core. Never fi ll the system so full that
expansion causes the coolant to rise up
in the condenser tubes. This will block the
steam from rising in the tubes to be cooled.
In turn, heating will occur until coolant is
forced out the overfl ow on the pressure cap
and coolant reaches the proper level.
ALWAYS CHECK AND ADD COOLANT
THROUGH THE FILLER CAP ON THE
WATER HOPPER RATHER THAN THE
PRESSURE CAP ON TOP OF THE
CONDENSER.
PRESSURE RELIEF VALVE
A pressure cap on the condenser prevents
damaging pressure from developing. Do not
use a pressure cap of greater than 4 pounds
pressure as this only exerts excessive
pressure on the cooling system.
During the warm-up period, air and slight
amounts of vapor will be released from the
pressure relief valve. If vapor is released
under normal operation, after the engine is
warmed up, check whether the condenser
fi ns are clogged with dirt, which will restrict
the air fl ow causing the engine to overheat.
Inspect the condenser for this condition
every week or so.
THERMAL-SIPHON
(Optional and older Climax and Arrow
engines.)
The thermal-siphon cooling system differs
from the ebullient cooling system in that
the radiator is fi lled with coolant 3/4 full.
In the thermal-siphon system the core is
actually a radiator rather than a condenser.
A hose connects the radiator top tank to the
water hopper. A sight glass is in the hose
approximately 1/3 of the distance down
from the top tank. The coolant level should
be visible in this gauge glass at normal
14 C-SERIES SERVICE, OPERATION & PARTS MANUAL – AEPB1 1-800-331-3662