Inspecting cooling system for leaks · ar2000w1010b · Mercedes-Benz WIS

AR20.00-W-1010B

Inspecting cooling system for leaks

13.12.11

ENGINES 902.9 in MODEL 957 with CODE (MS8) Natural gas engine

ENGINES 904.9 in MODEL 374, 375, 673, 674, 676, 958, 970, 972, 975, 976

ENGINES 906.9 in MODEL 374, 958, 970, 972, 974, 975, 976

ENGINES 906.9 in MODEL 374, 375, 950, 952, 953, 954, 957, 958

W20.00-0004-11

Shown on model 970

1 Cap

2 Coolant expansion reservoir

3  Adapter

4  Testing unit

Modification notes

17.2.09	Set temperature selector wheel of heater to max. heat output and switch on ignition, added.	Step 3
	Permissible pressure drop in cooling system, added.	Step 8	*BE20.30-N-1001-01F
	Coolant filling capacity, added.	Operation step 4, 11	*BF20.00-N-1001-01C
	Screw down cap (1) on coolant expansion reservoir (2), added.	Step 12
	Close maintenance flap, added.	Step 13

	Checking
 Danger!	Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by 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
	Notes on coolant		AH20.00-N-2080-01A
1	Open maintenance flap
2	Unscrew cap (1) from coolant expansion reservoir (2)
3	Set temperature selector wheel of heater to max. heat output and switch on ignition.
4	Check coolant level, add coolant if necessary	 If the antifreeze in the coolant is too low, either add more antifreeze or change the coolant.
			*BF20.00-N-1001-01C
5	Rub the inside of the coolant filler neck dry on coolant expansion reservoir (2)
6	Turn rubber seal on adapter (3) until it fits the inside diameter of the coolant filler neck		*655589006300
7	Install adapter (3) und test equipment (4) on coolant expansion reservoir (2)		*001589832100
			*655589006300
8	Apply compressed air to the cooling system at the testing unit (4) and check cooling system for leaks	 Observe test pressure and test period since otherwise damage may occur to the cooling system.	*BE20.30-N-1001-01F
		 A pressure drop at the pressure gauge of the testing unit (4) is visible in case of leaks in the cooling system.
9	Perform visual inspection on all coolant carrying components	 In the event of a pressure drop and visible coolant loss: 
		Check radiator, heater, coolant pump, cooling and heating hoses, coolant lines and their connecting points, hose clamps, cylinder head gaskets, core hole cap or core hole plug screws; remove leaks in the cooling system.
		In the event of a pressure drop and no visible coolant loss: 
		Check cylinder head for leaks.
10	Let out test pressure at test equipment (4) and detach adapter (3) with test equipment (4) on coolant expansion reservoir (2)
11	Check coolant level, add coolant if necessary	 If the antifreeze in the coolant is too low, either add more antifreeze or change the coolant.
			*BF20.00-N-1001-01C
12	Tighten cap (1) on coolant expansion reservoir (2)
13	Close maintenance flap

Check values for cooling system

Number	Designation			Engine 900.9, 902.9, 904.9, 906.9, 924.9, 925.9, 926.9


BE20.30-N-1001-01F	Permissible pressure drop in cooling system	Test pressure 1.0 bar, test period 5 to 10 min	bar	0

 Engine cooling system

Number	Designation			Engine 902.9, 906.9 in model 957	Engine 904.9 in model 374.4, 375.1, 958.0, 970, 972, 975, 976	Engine 904.9 in model 673, 674, 676


BF20.00-N-1001-01C	Coolant	Total filling capacity	L	48	19	20
		Anticorrosion/antifreeze agent down to -37°C	L	24	9.5	10
		Anticorrosion/antifreeze agent down to -45 °C	L	26.5	10.5	11
		Specifications for Operating Fluids	Sheet	BB00.40-P-0310-01A	BB00.40-P-0310-01A	BB00.40-P-0310-01A
			Sheet	BB00.40-P-0325-02A	BB00.40-P-0325-02A	BB00.40-P-0325-02A
			Sheet	–	BB00.40-P-0325-05A	BB00.40-P-0325-05A

 Engine cooling system

Number	Designation			Engine 906.9 in model 374.4, 958.0, 970, 972, 974, 975, 976	Engine 906.9 in model 374.5, 375.3, 950, 952, 953, 954, 958.2 without code BA1 or BA9


BF20.00-N-1001-01C	Coolant	Total filling capacity	L	23.0	22
		Anticorrosion/antifreeze agent down to -37°C	L	11.5	11
		Anticorrosion/antifreeze agent down to -45 °C	L	13.0	12.0
		Specifications for Operating Fluids	Sheet	BB00.40-P-0310-01A	BB00.40-P-0310-01A
			Sheet	BB00.40-P-0325-02A	BB00.40-P-0325-02A
			Sheet	BB00.40-P-0325-05A	BB00.40-P-0325-05A

 Engine cooling system

Number	Designation			Engine 906.9 in model 950, 952, 953, 954, 958.2 with code BA1	Engine 906.9 in model 950, 952, 953, 954 with code BA9


BF20.00-N-1001-01C	Coolant	Total filling capacity	L	37	40
		Anticorrosion/antifreeze agent down to -37°C	L	18.5	20
		Anticorrosion/antifreeze agent down to -45 °C	L	20.5	22
		Specifications for Operating Fluids	Sheet	BB00.40-P-0310-01A	BB00.40-P-0310-01A
			Sheet	BB00.40-P-0325-02A	BB00.40-P-0325-02A
			Sheet	BB00.40-P-0325-05A	BB00.40-P-0325-05A

655 589 00 63 00

Adapter

Tester

001 589 83 21 00

Referenced documents

ah2000n208001a Notes on coolant
as2000z000101a Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.