Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1700
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 thermostat
Replace
Faulty Engine Coolant temperature
sensor
Repair or replace
Clogged radiator
Clean or replace
Faulty radiator cap
Replace
Low engine oil level or use of
improper engine oil
Replenish or change oil
Clogged exhaust system
Clean exhaust system or replace
faulty parts
Faulty Throttle Position sensor
Replace throttle valve assembly
Open or shorted Throttle Position
sensor circuit
Repair or replace
Damaged cylinder head gasket
Replace
Loosen V-belt tension
Adjust belt tension or replace.
Collapsed hoses
Replace
Faulty Fan clutch
Replace
Engine overcooling
Faulty thermostat
Replace
Engine slow to warm-up
Faulty thermostat
Replace
Thermo unit faulty
Replace
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 but no more than 70 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 at
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 heater
core (behind the center console).
11.If the running water sound is heard, repeat steps 8 to 10.
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 battery ground cable.
2. Drain coolant.
3. Disconnect radiator hose (on inlet pipe side).
4. Remove timing belt, refer to "Timing Belt" in this manual.
5. Remove water pump assembly.
Inspection
Make necessary repair and parts replacement if extreme wear
or damage is found during inspection. Should any of the
following problems occur, the entire water pump assembly
must be replaced:
• Crack in the water pump body
• EC leakage from the seal unit
6B-8 ENGINE COOLING
• Play or abnormal noise in the bearing
• Cracks or corrosion in the impeller
Installation
1. Before installing water pump, coat sealing surface with
silicon grease.
2. Install water pump assembly and tighten bolts to the
specified torque.
Torque: 25 N
⋅⋅⋅⋅m (2.5 kgf⋅⋅⋅⋅m)
3. Timing belt
• Install timing belt, refer to timing belt installation step in
"Timing Belt" in this manual.
4. Connect radiator hose and replenish EC.
5. Connect battery ground cable.
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