Cooling; Coolant (Industrial); Draining And Filling The Cooling System - Ford LSG 875 Service Manual

7-01
COOLING 7-01
Part 7 - Cooling
SUBJECT -
PAGE
DESCRIPTION AND OPERATION
Coolant (industrial) . . . . . . . , . . , . . . . . . . , I . . . . . . . 7-01
TESTING
Pressure Test . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . 7-02
Thermostat Test . . . . . , . . . . . . . . . . . . , . . . . . . , . . . 7-02
DESCRIPTION AND OPERATION
SUBJECT
PAGE
ADJUSTMENTS
Drive Belt . . I . . . . . . . I . . . . . . . . . . . . . . . . . . . . . . , . 7-03
Belt Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-03
Thermostat Replacement . . . . . . . . . . . . . . . . . . . . . 7-03
REMOVAL AND INSTALLATION . . . . . . . . . . . . . m . 7-03
CLEANING AND INSPECTION a
l
. . . . . . . . . m . . . . . 7-04
Cooling System ..,.I...,,,.,.,..,..,....,,..
7-04
The cooling system is a series-parallel flow.
Coolant flow is from the radiator to the water
pump through passages in the front cover (both
sides) to the cylinder block. Flow continues
through the block to the rear and up through the
deck or head faces, then forward through the
cylinder heads to the water crossover at the
front of the intake manifold, through the water
outlet (thermostat housing) and to the top of the
radiator.
The flow with the thermostat closed is through
the by-pass hose to the suction side of the water
pump=
NOTE:
The cooling system may change on
marine engines as they are marinized. The
water pump may be deleted on ski boat
engines.
A5505 1 A
COOLANT (INDUSTRIAL)
Correct coolant level is essential for maximum
circulation and adequate cooling. In addition, for
the cooling system to perform its function, it
must receive proper care. This includes keeping
the radiator fins clean and a periodic inspection
of the cooling system for leakage.
Use care when removing the pressure cap to
avoid injury from escaping steam or hot water.
When the cooling system is drained, fill the
system with specified coolant.
All coolant added should be the specified mix-
ture of Ford permanent anti-freeze and water. If
Ford Permanent Anti-Freeze is not available, an-
other reputable permanent anti-freeze may be
used and diluted with an equal quantity of water.
Ordinary tap water may be used in an emer-
gency except in areas where the water is known
to be exceptionally hard or to have a high alkali
content. The cooling system should be drained
and flushed and the proper mixture of anti-
freeze added as soon as possible, however.
To avoid possible overheating in very hot
weather, do not use mixtures with more than 50
percent anti-freeze except in areas where anti-
freeze protection below -35 degrees F is re-
quired. In this case, refer to the coolant mixture
chart on the Ford Permanent Anti-Freeze
container.
A standard ethylene glycol hydrometer can be
used to check the protection level of the long-life
coolant.
To prevent damage to the cooling system dur-
ing periods of below freezing ambient tem-
perature, when water or anti-freeze is added to
the supply tank, always operate the engine at
fast idle for 30 minutes before letting the engine
set in the OFF position for prolonged periods.
This will allow a uniform mixture throughout the
cooling system and prevent damage by freezing,
when sufficient anti-freeze is used.
DRAINING AND FILLING THE SYSTEM -
To prevent loss of anti-freeze when draining
the radiator, attach a hose on the radiator drain -
cock and drain the coolant from the radiator into
a clean container.
To drain the radiator, open the drain cock lo-
cated at the bottom of the radiator and remove
the radiator or supply tank cap. The cylinder
block is drained by removing the drain plugs lo-
cated on both sides of the block.
To
fill the cooling system, install the cylinder
block drain plug(s) and close the radiator drain
cock.
After the initial fill, the coolant level will drop
approximately 1 quart after the engine has been
operated about 20 minutes at 2000 rpm. This is
due to the displacement of entrapped air. Refill
radiator as required.