Pour in coolant and bleed engine cooling system

AR20.00-S-1142-03PS

Pour in coolant and bleed engine cooling system

 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

Engine

642 in model 470, 471

Modification notes

17.01.2019

Repair materials removed and filling capacity reference modified

Step 5

 Filling capacities for engine cooling system

Number

Designation

Engine 642 in model 470, 471

BF20.00-N-1001-01PS

Coolant

Total filling capacity

Liter

 10,0

Anti-corrosion protection/antifreeze down to ­37 °C

Liter

 5,0

Anti-corrosion protection/antifreeze down to ­45 °C

Liter

 5,5

Sheet

BB00.40-P-0310-01A

Sheet

BB00.40-P-0325-05A

Sheet

BB00.40-P-0326-06A

1

Tester cap

5

Drain valve

9

Compressed-air hose

2

Control unit

6

Feed hose

10

Coolant expansion reservoir

3

Venturi nozzle

7

Coolant reservoir

11

Receptacle

4

Supply valve

8

Waste air hose

1

 Screw tester cap (1) onto coolant expansion reservoir (10).

2

Connect control unit (2) to  tester cap (1).

3

Connect venturi nozzle (3) to control unit (2).

4

Close feed valve (4) and drain valve (5).

5

It must   Pour coolant with the right mixing ratio into the coolant reservoir (7).

 Make sure that there is more coolant in the coolant reservoir (7) than the engine cooling system's maximum filling capacity.
Otherwise, air can enter the engine cooling system.

6

Connect feed hose (6) to coolant reservoir (7).

7

Connect waste air hose (8) to a suitable empty receptacle (11).

8

Connect compressed-air hose (9) to venturi nozzle (3) and apply compressed air from the compressed air system of the workshop.

 A vacuum is created in the engine cooling system.

9

Open drain valve (5).

10

Open feed valve (4) for a short time until the feed hose (6) has filled with coolant; then close the feed valve (4).

 The vacuum sucks the coolant out of the coolant reservoir (7).

11

Close drain valve (5) as soon as the display of the control unit (2) is in the green area.

12

Disconnect compressed-air hose (9) from venturi nozzle (3).

13

Observe control unit (2) to see whether the vacuum in the engine cooling system remains stable for approx. 30 s.

If the vacuum decreases:



Check engine cooling system for leak tightness; repair depending on findings and repeat test with vacuum.

14

Open feed valve (4).

 The coolant now flows from the coolant reservoir (7) into the engine cooling system.

15

Open drain valve (5) as soon as the coolant is no longer flowing into the engine cooling system.

 The remaining vacuum decreases.

16

 Remove vacuum-type cooling system filler and  tester cap (1).

17

  Correct coolant level in coolant expansion reservoir (10).