Check coolant thermostat

AR20.10-B-2455E

Check coolant thermostat

12.02.16



Check

1

Remove thermostat valve (1).

AR20.10-B-2460G

2

Fasten a thermostat wire to thermostat valve (1) and submerge it in water vessel (2).

3

Use an adequate heater (5) to heat the water, stir water to obtain uniform temperatures within the vessel.

Do not use blowtorch to heat up the water.

4

Measure water temperature.

 From 8 o C lower than opening start, the temperature cannot be increased by more than 1 to 2 o C per minute.

When water temperature reaches the opening start value, the valve will begin to open.

*BE20.10-B-1001-02E

5

Slowly heat water to full stroke temperature (L) of short-circuit valve (1.2).

*BE20.10-B-1003-02E

6

Slowly heat water to the total opening temperature of the main valve (1.1). After 6 to 8 minutes, the main valve (1.1) will be fully open. Then measure the opening.

 If specified values are not obtained and if there is any sign of malfunction, thermostat valve (1) must be replaced by a new one.

*BE20.10-B-1002-02E

7

Install thermostat valve (1).

AR20.10-B-2460G

Número

Denominação

Engine 476.93

BE20.10-B-1001-02E

Nominal temperature and beginning of opening

Nominal

°C

83

Beginning of opening

°C

81...85

BE20.10-B-1002-02E

Main valve

Maximum opening

°C

95

Minimum course

mm

8

BE20.10-B-1003-02E

Short-circuit valve

Totally closed

°C

92

Course

mm

6...7,5