DV11
Operation and Maintenance
181
Maintenance of Major Components
Printed in Mar. 2005 PS-MMA0608-E1A
5.1.2. Specification
Item Specification
Type Centrifugal type
Pumping speed 3,500 rpm
Delivery about 452 liter/min or more
1. Water pump
Pumping back pressure Bellow 1.8 bar
Operating temperature
79°C type 83°C type
Valve lift
8mm or more
(at 94°C)
8mm or more
(at 95°C)
2. Thermostat
Operating temperature
79 ∼ 94°C 83 ∼ 95°C
3. Cooling fan and belt
Fan diameter – Number of blades
Truck : φ711.2mm – 9
Fan belt tension Auto tensioner
5.1.3. Thermostat
z General descriptions and main data
The thermostat maintains a
constant temperature of coolant (90
∼ 95 °C) and improves thermal
efficiency of the engine by
preventing heat loss.
Namely, when the temperature of
coolant is low, the thermostat valve
is closed to make the coolant
bypass to directly enter the water
pump; when the coolant
temperature rises to open wide the
thermostat valve, the bypass circuit
is closed and the water passage to
the radiator is opened so that the
coolant is forced to flow into the
radiator.
Item In moderate climates In tropical climates
Type Wax-pallet type
Open at
83 °C 71 °C
Open wide at
95 °C 85 °C
Valve lift 8 mm or more 8 mm or more
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