CLOSED COOLING MODELS - 6B-3390-823225--1 1096
Closed Cooling System With
Raw Water Flow Thru
Exhaust Manifold
(Engines With Serpentine
Belt Only)
Maintaining Closed Cooling System
Coolant
At least weekly, before starting engine, check to en-
sure that coolant is visible in coolant recovery bottle.
If coolant is not visible, check coolant section of
cooling system (including coolant recovery system)
for leaks and repair, as necessary. Refill coolant sec-
tion with recommended coolant solution, as outlined
under “Changing Closed Cooling System Coolant,”
following.
If coolant is visible, start engine and run until it
reaches normal operating temperature, then recheck
coolant level in coolant recovery bottle. Coolant level
MUST BE between the “ADD” and “FULL” marks (on
front of bottle). If level is low, remove fill cap from
coolant recovery bottle and add required amount of
coolant solution. Use a 50/50 mixture of ethylene
glycol antifreeze and pure, soft water for coolant
additions, if frequent additions of coolant are re-
quired, check coolant section for leaks.
71712
a
a - Fill Cap
IMPORTANT: ALCOHOL OR METHANOL BASE
ANTIFREEZE OR PLAIN WATER ARE NOT REC-
OMMENDED FOR USE IN CLOSED COOLING
SYSTEM AT ANY TIME. In areas where ethylene
glycol is not available, and the possibility of
freezing does not exist, it is permissible to use a
solution of rust inhibitor and pure, soft water
(mixed to manufacturer’s recommendations).
!
WARNING
Coolant section of Closed Cooling System is
equipped with a 16 psi (110 kPa) pressure cap (fill
cap). Before removing pressure cap, following,
first allow engine to cool down, as sudden loss of
pressure could cause hot coolant to boil and dis-
charge violently. After engine has cooled down,
turn pressure cap 1/4-turn to allow any pressure
to escape slowly, then push down and turn cap
all-the-way off.
Occasionally, check to ensure that coolant recovery
system is functioning properly by removing pressure
cap from heat exchanger and checking level. Coolant
level should be up to bottom of heat exchanger filler
neck. If low, inspect entire coolant section (especially
coolant recovery system) for leaks and repair, as
necessary.
IMPORTANT: When reinstalling pressure cap, be
sure to tighten it until its contact stops on filler
neck.
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