Water Pump; Thermostat; Radiator - Isuzu NHR 4J Series Workshop Manual

6B - 2 ENGINE COOLING
The cooling system is a pressurized coolant forced circulation
type which consists of water pump, thermostat cooling fan,
radiator and other components. The circulating coolant cools
the lubricating oil in the oil filter and turbocharger.

WATER PUMP

The coolant pump is a centrifugal impeller type and is driven by
V type drive belt.
The water pump is not disassembled type.
6B-2-1.tif

THERMOSTAT

The thermostat is a wax pellet type with a juggle valve and is
installed in the thermostat housing.
6B-2-2.tif

RADIATOR

The radiator is a tube type with corrugated fins. In order to
raise the boiling point of coolant, the radiator is adjusted
through a valve fitted to the upper tank to a pressure range of
93 - 123 kPa (0.95 - 1.25 kg/cm
head thermostat housing has only a water supply function.
6B-2-3.tif
2
). The cap fitted to the cylinder