Check engine cooling system for leaktightness

AR20.00-W-1011M

Check engine cooling system for leaktightness

26.02.2016

Engine

934.9, 936.9 in model 967

1

Expansion reservoir

2

Clamp

3

Test equipment

4

Knurled nut

5

Adapter

Pfeile

Joint

 Danger !

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



Check

1

Open maintenance flap

2

Unscrew cap on expansion reservoir (1)

3

Check coolant level; correct if necessary



Coolant specifications

BB00.40-P-0310-01A



Anticorrosion agent/antifreeze (specification 325.5)

BB00.40-P-0325-05A

4

Dry rub expansion reservoir (1) inside on the filler neck

5

Turn rubber element on adapter (5) until it fits the inside diameter of the coolant filler neck

 Adapter

*655589006300

6

Screw off knurled nut (4) on adapter (5)

7

Tighten test equipment (3) onto adapter (5)

 Tester

*001589832100

8

Attach adapter (5) with test equipment (3) to expansion reservoir (1)

9

Hook clamp (2) on adapter (5) and the joint (arrow) of the filler neck

 Clamp

*950589126300

10

Pretension the clamp (2) using the knurled nut (4)

11

Apply compressed air to test equipment (3) and check engine cooling system for leaktightness


Observe test pressure and test period.
Otherwise damage can occur to the engine cooling system.

Pressure drop in cooling system for

*BE20.30-N-1001-01H

12

Perform a visual inspection on all components carrying coolant

For a pressure drop with visible coolant loss:



Check radiator, heater cooler, coolant pump, coolant hoses, coolant lines and their connections, hose clamps, cylinder head gasket, core plug or core plug screws; remove leaks in engine cooling system.

For a pressure drop without visible coolant loss:



Check cylinder head for cracks.

13

Relieve test pressure at test equipment (3) completely

14

Loosen knurled nut (4) and remove clamp (2)

15

Remove adapter (5) with test equipment (3) on expansion reservoir (1)

16

Check coolant level, pour in coolant if necessary



Coolant specifications

BB00.40-P-0310-01A



Anticorrosion agent/antifreeze (specification 325.5)

BB00.40-P-0325-05A

17

Tighten cap on expansion reservoir (1)

18

Close maintenance flap

Check values for cooling system

Number

Designation

Engine 470.9, 471.9, 934.9, 936.9

BE20.30-N-1001-01H

Pressure drop in cooling system for

test pressure 1.0 bar and test period 5 to 10 min.

bar

0