SERVICE PRECAUTION
| WARNING | THIS VEHICLE HAS A SUPPLEMENTAL RESTRAINT SYSTEM (SRS). REFER TO AIR BAG RESTRAINT SYSTEMS TO DETERMINE WHETHER YOU ARE PERFORMING SERVICE ON OR NEAR THE SRS COMPONENTS OR THE SRS WIRING. WHEN YOU ARE PERFORMING SERVICE ON OR NEAR THE SRS COMPONENTS OR THE SRS WIRING, REFER TO AIR BAG RESTRAINT SYSTEMS FOR SRS SERVICE INFORMATION. FAILURE TO FOLLOW WARNINGS COULD RESULT IN POSSIBLE AIR BAG DEPLOYMENT, PERSONAL INJURY, OR OTHERWISE UNNEEDED SRS SYSTEM REPAIRS. |
| 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. |
Scheme 11
The cooling system is a pressurized Engine Coolant (EC) forced circulation type which consists of a water pump, thermostat cooling fan, radiator and other components. The automatic transmission fluid is cooled by the EC in the radiator.
WATER PUMP
The EC pump is a centrifugal impeller type and is driven by a timing belt.
Scheme 12
THERMOSTAT
The thermostat is a wax pellet type with a air hole (1) and is installed in the thermostat housing.
Scheme 13
RADIATOR
The radiator is a tube type with corrugated fins. In order to raise the boiling point of the coolant, the radiator is fitted with a cap in which the valve is operated at 88.2 - 117.6 kPa (12.8 - 17.0 psi) pressure. (No oil cooler provided for M/T)
Scheme 14
Scheme 15
- Relation between the mixing ratio and freezing temperature of the EC varies with the ratio of anti-freeze 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 NOTE: Antifreeze solution + Water = Total cooling system capacity.
- Total Cooling System Capacity
- A/T 10.0 Lit (2.64 U.S. gal)
- 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.
Scheme 16
Scheme 17
Radiator Cap
Measure the valve opening pressure of the pressurizing valve with a radiator filler cap tester.
Replace the cap if the valve opening pressure is outside the standard range.
Valve opening pressure kPa (psi): 93.3 - 122.7 (13.5 - 17.8)
Cap tester: J -24460 -01
Adapter: J-33984 -A
Check the condition of the vacuum valve in the center of the valve seat side of the cap. If considerable rust or dirt is found, or if the valve seat cannot be moved by hand, clean or replace the cap.
Valve opening vacuum kPa (psi): 0 - 6.9 (0 - 1.0)
Scheme 18
Radiator Core
- A bent fin may result in reduced ventilation and overheating may occur. All bent fins must be straightened. Pay close attention to the base of the fin when it is being straightened.
- Remove all dust, bugs and other foreign material.
Cooling System Leakage Check
Use a radiator cap tester to force air into the radiator through the filler neck at the specified pressure of 150 kPa (22 psi) with a cap tester
- Leakage from the radiator
- Leakage from the coolant pump
- Leakage from the water hoses
- Check the rubber hoses for swelling.
Cap tester: J -24460 -01
Adapter: J-33984 -A
Scheme 19
Scheme 20
Scheme 21
- Install rubber cushions on both sides of radiator bottom.
- Install radiator assembly with hose, taking care not to damage the radiator core with a fan blade.
- Connect reserve tank hose (4).
- Install lower fan guide (3).
- Connect radiator inlet hose and outlet hose to the engine.
- Connect oil cooler hose (1) to automatic transmission.
- Connect battery ground cable.
- Pour engine coolant up to filler neck of radiator, and up to MAX mark of reserve tank.
Important operation (in case of 100% engine coolant change) procedure for filling with engine coolant.
Engine Coolant Filling Up Procedure
- Make sure that the engine is cool. WARNING: When the coolant is heated to a high temperature, be sure not to loosen or remove the radiator cap. Otherwise you might get scalded by hot vapor or boiling water. To open the radiator cap, put a piece of thick cloth on the cap and loosen the cap slowly to reduce the pressure when the coolant has become cooler.
- Open radiator cap pour coolant up to filler neck.
- Pour coolant into reservoir tank up to "MAX" line.
- Tighten radiator cap and start the engine. After idling for 2 to 3 minutes, stop the engine and reopen radiator cap. If the water level is lower, replenish.
- After replenishing with coolant tighten radiator cap, warm up the engine at about 2000 RPM. Set heater adjustment to the highest temperature position, and let the coolant circulate also into heater water system.
- Check to see the thermometer, continuously idle for 5 minutes and stop the engine.
- When the engine has been cooled, check filler neck for water level and replenish if required. Should extreme shortage of coolant is found, check the coolant system and reservoir tank hose for leakage.
- Pour coolant into the reservoir tank up to "MAX" line.
Scheme 22
The drive belt adjustment is not required as automatic drive belt tensioner is equipped.