Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1699
ENGINE COOLING 6B-1
SECTION 6B
ENGINE COOLING
CONTENTS
PAGE
General Description . . . . . . . . . . . . . . . . . . . . . . . . . ... 6B- 2
Service Precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . 6B- 3
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6B- 5
Draining and Refilling Cooling System . . . . . . . . . . . . . . . . . . 6B- 6
Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6B- 7
Water Pump and Associated Parts . . . . . . . . . . . . . . . . . . .. 6B- 7
Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6B- 7
Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 6B- 7
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6B- 8
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6B- 9
Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6B- 9
Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 6B- 9
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6B- 9
Fan clutch with Cooling Fan. . . . . . . . . . . . . . . . . . . . . . .. 6B- 9
Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . ... 6B- 9
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 6B-11
Radiator and Associated Parts . . . . . . . . . . . . . . . . . . . . . 6B-11
Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6B-11
Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 6B-12
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6B-13
Main Data and Specifications. . . . . . . . . . . . . . . . . . . . . . 6B-13
Special Service Tool. . . . . . . . . . . . . . . . . . . . . . . . . ... 6B-14
6B-2 ENGINE COOLING
General Description
Legend
1 Water Pump
2 Thermostat
3 Radiator
4 Reserve Tank
5 Coolant Distributor
6 Cylinder Block and Head
7 Throttle Body
8 Heater
The Cooling System is a pressurized type, where the water
pump, which is cambelt driven, forces the circulation of
the coolant through the cylinder block and head. The
thermostat regulates the flow of coolant between the
radiator and the bypass circuit. The heater is part of the
bypass circuit. The throttle body pre-heat is a separate
circuit which is not regulated by the thermostat. An oil
cooler may be fitted as part of this circuit.
ENGINE COOLING 6B-3
Service Precaution
CAUTION:
Always use the correct fastener in the proper location.
When you replace a fastener, use ONLY the exact part
number for that application. ISUZU will call out those
fasteners that require a replacement after removal. ISUZU
will also call out the fasteners that require thread lockers
or thread sealant. UNLESS OTHERWISE SPECIFIED, do
not use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or fastener
joint interfaces. Generally, such coatings adversely affect
the fastener torque and the joint clamping force, and may
damage the fastener. When you install fasteners, use the
correct tightening sequence and specifications. Following
these instructions can help you avoid damage to parts and
systems.
Water pump
The water pump is centrifugal type and is driven by timing belt.
Thermostat
The thermostat is a bypass type and is a wax pellet type with a
air hole.
Radiator
The radiator is a flow type with corrugated fins.
6B-4 ENGINE COOLING
Antifreeze Solution
• Relation between Mixing ratio and Freezing temperature of
the engine coolant varies with the ratio of antifreeze solution
in water. Proper mixing ratio can be determined by referring
to the chart. Supplemental inhibitors or additives claiming to
increase cooling capability that have not been specifically
approved by Isuzu are not recommended for addition to the
cooling system.
• Calculating mixing ratio
Mixing ratio
=
Antifreeze solution (Lit/gal.)
Antifreeze solution (Lit/gal.) + Water (Lit/gal.)
NOTE: Antifreeze solution + Water = Total cooling system
capacity.
• Total Cooling System Capacity
5.7Lit
• Mixing ratio
Check the specific gravity of engine coolant in the cooling
system temperature ranges from 0
°C to 50°C using a
suction type hydrometer, then determine the density of the
engine coolant by referring to the table.
NOTE:
1. Even in the areas where the atmospheric temperature
is higher than 0
°C, be sure not to use antifreeze
solution at a mixing ratio lower than 20% so that the
inside of the engine may not be corroded.
2. If antifreeze solution is used at a mixing ratio higher
than 60%, the specific heat of the coolant falls and the
engine may be overheated. Moreover, antifreeze
performance drop and the coolant may be frozen. The
density of the solution must be adjusted as occasion
calls.
Antifreeze solution lower than 20% may not have
sufficient anticorrosive performance, and therefore,
please never fail to adjust as occasion demands
within the range of 20% to 60%.
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