Test coolant thermostat

AR20.10-D-2455AD

Test coolant thermostat

16.8.06



Checking

 Danger!

Risk of injury to skin and eyes caused by handling hot or glowing objects.

Wear safety gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

1

Remove coolant thermostat (1)

AR20.10-D-2460AD

2

Suspend coolant thermostat (1) from a wire in a vessel filled with water

3

Warm water in the vessel

 Stir water so that temperature of water is the same at all points
The heating-up rate should be not more than 1°C to 2 °C/minute from about 8 °C below start of opening of coolant thermostat (1).

Coolant thermostat - start of opening

*BE20.10-N-1001-02A



*WH58.30-Z-1006-08A



*WH58.30-Z-1002-28A

4

Heat water to full opening temperature of bypass valve (1/2)

Coolant thermostat bypass valve

*BE20.10-N-1003-02A



*WH58.30-Z-1006-08A



*WH58.30-Z-1002-28A

5

Heater water to full opening temperature of main valve (1/1), measure stroke

 The main valve (1/1) must be opened completely after 6 to 8 minutes, otherwise replace coolant thermostat (1) if necessary.

Coolant thermostat - main valve

*BE20.10-N-1002-02A



*WH58.30-Z-1006-08A



*WH58.30-Z-1002-28A

6

Install coolant thermostat (1)

AR20.10-D-2460AD

Number

Designation

Engine
900.9, 902.9, 904.9, 906.9

BE20.10-N-1001-02A

Coolant thermostat - start of opening

°C

83 (2)

BE20.10-N-1002-02A

Coolant thermostat - main valve

Full opening

°C

95

Stroke

mm

8

BE20.10-N-1003-02A

Coolant thermostat - bypass valve closed at

°C

92

Number

Designation

WH58.30-Z-1006-08A

Temperature measuring instrument (measuring range -200 °C to +1000°C)

WH58.30-Z-1002-28A

Heating plate