ar2010d2460c

Removing and installing engine coolant thermostat

Type ar · topic 20.10 · version 0102 · 1999-10-22

Applies to: ENGINE 111.979 in MODEL 901, 902, 903, 904

Where it sits

Function group 1 Engine › 20 Engine cooling system › 20.10 Coolant pump, coolant thermostat — Series 901 · Series 902 · Series 903 · Series 904

EinPAS 15 Engine › 15.25 Engine cooling system › 15.25.30 Pump/thermostat/preheater — Series 901 · Series 902 · Series 903 · Series 904

Also applies to engines/gearboxes: 111 979

AR20.10-D-2460C

Removing and installing engine coolant thermostat

14.2.96

ENGINE 111.979 in MODEL 901, 902, 903, 904

Removing and installing engine coolant thermostat

D20.10-1000-12

1 Coolant thermostat

2 Cover

3 Coolant hose

4 Seal

5 Vent pipe

6 Bolts+washers

Removal, installation

Danger!

Danger of severe burns to skin and eyes from hot coolant spewing out. Coolant is toxic when swallowed

Open cooling system only when coolant temperature is below 90 °C. Open cover slowly and reduce pressure. Do not fill beverage containers with coolant. Wear protective gloves, protective clothing and protective goggles.

AS20.00-Z-0001-01A

1

Drain coolant

AP20.00-D-2080A

2

Detach vent pipe (5) and coolant hose (3) at the cover (2)

3

Unscrew bolts+washers (6) and take coolant thermostat (1) together with cover (2) out of the coolant thermostat housing


The coolant thermostat (1) must not be removed from the cover (2) otherwise it will be destroyed. It is not possible to re-install it.
Installing: replace seal (4)

*BA20.10-N-1004-01A

4

Install in the reverse order

5

Inspect cooling system for leaks

AR20.00-D-1010C

Coolant pump, coolant thermostat

Number

Designation

Engine 111.979/
984

BA20.10-N-1004-01A

Coolant thermostat cover

Nm

10

Referenced documents