Test coolant thermostat

AR20.10-T-2455A

Test coolant thermostat

14.5.98



Inspect

Danger!

Risk of scalding from hot coolant splashing out

Do not open cap of the expansion reservoir or radiator unless coolant temperature is below 90 °C. Turn cap carefully to the first detent or slacken one turn. Wear protective clothing.

AS20.00-Z-0001-01A



Notes on coolant

All engines

AH20.00-N-2080-01A

1

Remove coolant thermostat

AR20.10-T-2460A

2

Test operation and start of opening of coolant thermostat

AR20.10-T-2455-01A

Coolant thermostat
start of opening

*BE20.10-N-1001-02E

Coolant thermostat
main valve stroke

*BE20.10-N-1002-02E

Coolant thermostat
short circuit valve stroke

*BE20.10-N-1003-02E

If the specified values are not achieved:

Replace coolant thermostat

AR20.10-T-2460A

Number

Designation

Engine 447

Engine 489

BE20.10-N-1001-02E

Coolant thermostat
start of opening

Standard version

°C

83 (2)

83 (2)

Tropical version

°C

71 (2)

71 (2)

BE20.10-N-1002-02E

Coolant thermostat
main valve

Standard version

Fully open

°C

95

95

Stroke

mm

8

8

Tropical version

Fully open

°C

85

85

Stroke

mm

8

8

BE20.10-N-1003-02E

Coolant thermostat
bypass valve

Standard version

closed

°C

92

92

Stroke

mm

6...7.5

6...7.5

Tropical version

closed

°C

82

82

Stroke

mm

6...7.5

6...7.5