Drain/pour in coolant

AR20.00-P-1142RK

Drain/pour in coolant

12.11.2018

Engine

157, 276, 278 in model 231

Modification notes

14.10.2016

Basic date for cooling system, added.

Operation step 13

2

Cap

3

Drain hose

3a

Fitting

4

Coolant expansion reservoir

7

Drain screw

Shown on engine 276

1

Coolant pump

3

Drain hose

5

Drain screw

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW

Drain off

1

Unscrew cap (2) on coolant expansion reservoir (4)

2

Remove lower engine compartment paneling

AR61.20-P-1105RK

3

Push drain hose (3) onto fitting (3a)

4

Open drain screw (7), drain coolant and catch it in a suitable reservoir

 Observe regulations to dispose of coolant.

5

Empty low-temperature water circuit

Engine 157, 278 in model 231

 To do this switch on ignition for 5 seconds. Repeat this procedure twice after a waiting time of about 30 s in order to empty the low-temperature water circuit.

6

Loosen drain screw (5) on coolant pump (1)

Engine 276 in model 231

7

Push drain hose (3) onto drain screw (5)

Engine 276 in model 231

8

Open drain screw (5), drain coolant and catch it in a suitable reservoir

Engine 276 in model 231

Pour in

9

Tighten drain screw (5)

Engine 276 in model 231

 Drain screw on coolant pump

*BA20.10-P-1008-01AA

10

Detach drain hose (3) from drain screw (5)

11

Close drain screw (7)

12

Detach drain hose (3) from fitting (3a)

13

Pour in coolant and ventilate engine cooling system

AR20.00-P-1142-04A

 Re-use clean coolant.

 Engine 157 in model 231Cooling system

*BF20.00-P-1001-02FA

 Engine 276 in model 231Cooling system

*BF20.00-P-1001-02BA

 Engine 278 in model 231Cooling system

*BF20.00-P-1001-02EA

 Cooler vacuum filling device

*285589002100

 Test cap

*210589009100

14

Bleed low-temperature water circuit

 To do this switch on ignition for 5 seconds. Repeat this procedure twice after a waiting time of about 30 s in order to fill the low-temperature water circuit and to bleed it.

15

Check engine cooling system for leaktightness

AR20.00-P-1010RK

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

16

Perform an engine test run and check engine cooling system for proper operation

17

Install lower engine compartment paneling

AR61.20-P-1105RK

 Coolant pump, coolant thermostat

Number

Designation

Engine 276

BA20.10-P-1008-01AA

Drain screw on coolant pump

Stage 1

Nm

6

Stage 2

°

90

 Cooling system

Number

Designation

Engine 276 in model 231

BF20.00-P-1001-02BA

Cooling system

Workshop replacement amount

Main circuit

l

10,8

Low-temperature circuit

l

1,9

Antifreeze/water

Up to -37°C

%

50/50

As of -38 °C

%

55/45

Specifications for Operating Fluids, sheet

BB00.40-P-0310-01A

Specifications for Operating Fluids, sheet

BB00.40-P-0325-00A

Specifications for Operating Fluids, sheet

BB00.40-P-0326-00A

 Cooling system

Number

Designation

Engine 278 in model 231

BF20.00-P-1001-02EA

Cooling system

Workshop replacement quantity

Main circuit

Liter

12,3

Low temperature circuit

Liter

2,2

Antifreeze/water

Up to -37°C

%

50/50

As of -38 °C

%

55/45

Sheet

BB00.40-P-0310-01A

Sheet

BB00.40-P-0325-00A

Sheet

BB00.40-P-0326-00A

 Cooling system

Number

Designation

Engine 157 in model 231

BF20.00-P-1001-02FA

Cooling system

Workshop change quantity

Main circuit

Liter

 8

Low-temperature circuit

Liter

 2

Antifreeze/water

Up to -37 °C

%

50/50

As of -38 °C

%

55/45

Sheet

BB00.40-P-0310-01A

Sheet

BB00.40-P-0325-00A

Sheet

BB00.40-P-0326-00A