Thermostat; Removal; Inspection; Installation - Isuzu C22NE Workshop Manual

Thermostat

Removal

1. Disconnect battery ground cable.
2. Drain engine coolant from the radiator and engine.
3. Disconnect radiator hose from the inlet pipe.
4. Remove thermostat housing.
5. Remove thermostat from thermostat housing.

Inspection

Suspend the thermostat in a water-filled container using thin
wire. Place a thermometer next to the thermostat.
Do not directly heat the thermostat.
Gradually increase the water temperature. Stir the water so
that the entire water is same temperature.
Confirm the temperature when the valve first begins to open.
Valve opening temperature 92°C (197.6°F)
Confirm the temperature when the valve is fully opened.
Valve full open temperature 107°C(224.6°F)
Mack necessary repair and parts replacement if extreme wear
or damage is found during inspection.

Installation

1. Before installing thermostat, coat sealing surface with
silicon grease.
2. Install O-ring.
3. Install thermostat housing and tighten bolts to the specified
torque.
Torque: 15 N⋅m (1.5 kgf.m)
4. Installation rubber hose.
5. Replenish engine coolant (EC).
6. Start engine and check for EC leakage.

Fan Clutch with Cooling Fan

Inspection and Repair

Make necessary correction or parts replacement if wear,
damage or any other abnormal condition are found through
inspection.
Visually inspect for damage, leak (silicon grease) or other
abnormal conditions.
1. Inspection (on-vehicle)
1) Turn the fan clutch by hand when in a low temperature
condition before starting the engine, and confirm that it
can be turned readily.
2) Start the engine to warm it up until the temperature at the
fan clutch portion gets to around 80°C. Then stop the
engine and confirm that the fan clutch can be turned with
considerable effort (clutch torque) when turned by hand.
ENGINE COOLING 6B-9