2004 ISUZU TF SERIES Workshop Manual

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Page 2513 of 4264

ISUZU TF SERIES 2004 Workshop Manual 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. I

Page 2514 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6B-4 ENGINE COOLING

Antifreeze Solution
Calculating mixing ratio
Mixing ratio

= Antifreeze solution (Lit/gal.)
Antifreeze solution (Lit/gal.) + Water (Lit/gal.)

NOTE: Antifreeze sol

Page 2515 of 4264

ISUZU TF SERIES 2004 Workshop Manual ENGINE COOLING 6B-5
Diagnosis
Engine Cooling Trouble
Condition Possible cause Correction
Engine overheating Low Engine Coolant level Replenish
Thermo mater unit faulty Replace
Faulty ther

Page 2516 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6B-6 ENGINE COOLING

Draining and Refilling Cooling
System
Before draining the cooling system, inspect the system and
perform any necessary service to ensure tha

6B-6 ENGINE COOLING

Draining and Refilling Cooling
System
Before draining the cooling system, inspect the system and
perform any necessary service to ensure that it is clean, does
not leak and is in proper working order. The engine coolant
(EC) level should be between the "MIN" and "MAX" lines of
reserve tank when the engine is cold. If low, check for leakage
and add EC up to the "MAX" line. There should not be any
excessive deposit of rust or scales around the radiator cap or
radiator filler hole, and the EC should also be free from oil.
Replace the EC if excessively dirty.
1. Completely drain the cooling system by opening the drain
plug at the bottom of the radiator.
2. Remove the radiator cap.
WARNING: TO AVOID THE DANGER OF BEING BURNED,
DO NOT REMOVE THE CAP WHILE THE ENGINE AND
RADIATOR ARE STILL HOT. SCALDING FLUID AND
STEAM CAN BE BLOWN OUT UNDER PRESSURE.
3. Disconnect all hoses from the EC reserve tank.
Scrub and clean the inside of the reserve tank with soap
and water. Flush it well with clean water, then drain it. Install
the reserve tank and hoses.
4. Refill the cooling system with the EC using a solution that is
at least 50 percent antifreeze.
5. Fill the radiator to the base of the filler neck.
Fill the EC reserve tank to "MAX" line when the engine is
cold.
6. Block the drive wheels and firmly apply the parking brake.
Shift an automatic transmission to "P" (Park) or a manual
transmission to neutral.
7. Remove the radiator cap. Start the engine and warm it up a
t
2,500 - 3,000 rpm for about 30 minutes.
8. When the air comes out from the radiator filler neck and the
EC level has gone down, replenish with the EC. Repeat this
procedure until the EC level does not go down. Then stop
the engine and install the radiator cap. Let the engine cool
down.
9. After the engine has cooled, replenish with EC up to the
"MAX" line of the reserve tank.
10. Start the engine. With the engine running at 3,000 rpm,
make sure there is no running water sound from the heate
r
core (behind the center console).
11. If the running water sound is heard, repeat steps 8 to 10.

Page 2517 of 4264

ISUZU TF SERIES 2004 Workshop Manual ENGINE COOLING 6B-7
Water Pump
Water Pump and Associated Parts

Legend
1 Water Pump Assembly 2 O-Ring
3 Bolt

2 3 1

Removal
1. Disconnect ba

Page 2518 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6B-8 ENGINE COOLING

Crack in the water pump body
EC leakage from the seal unit
Play or abnormal noise in the bearing
Cracks or corrosion in the impeller
Installa

Page 2519 of 4264

ISUZU TF SERIES 2004 Workshop Manual ENGINE COOLING 6B-9
Thermostat

Removal
1. Disconnect battery ground cable.
2. Drain engine coolant from the radiator and engine.
3. D

Page 2520 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6B-10 ENGINE COOLING
If the fan clutch rotates more readily, however, this
indicates that the silicon grease is leaking internally.
Replace the fan clutch with a new one.

2. Inspection (in

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