Inspect cooling system for leaks - AR20.00-P-1010OMA

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ENGINE 642, 651 in MODEL 212, 218

MODIFICATION NOTES

15.3.11	Info about scope of testing supplemented	Operation step 7
26.9.14	Coolant mixing ratio		BF20.00-P-1001-04A

Shown on engine 642 in model 212

Fig 1: Inspecting Cooling System For Leaks

Courtesy of MERCEDES-BENZ USA

	Remove
	Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. 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
	Notes on coolant		AH20.00-N-2080-01A
1	Adjust heater to maximum heat output
2	Unscrew cap (1) slowly at expansion reservoir (2) and relieve overpressure
3	Check coolant level
	Notes on coolant level		AH20.00-P-1142-01CW
		Coolant mixing ratio	*BF20.00-P-1001-04A
4	Screw on tester cap (3) at the expansion reservoir (2)	Test cap	Figure
5	Connect pressure pump (4) at test cap (3)	Pressure pump	Figure
6	Apply test pressure to cooling system	The specified test pressure must not be exceeded. This is to avoid damage to the cooling system.
6	Apply test pressure to cooling system	ENGINE 642, 651 in MODEL 212, 218 2-stage cap	*BE20.30-P-1005-01A
7	Perform visual inspection on coolant carrying components		AR09.41-P-1311-01AL
7	Perform visual inspection on coolant carrying components	Check condition and seating of the Henn coupling; replace catch springs if necessary. This avoids coolant loss. Check condition and coolant loss for all coolant carrying components and connections. The coolant carrying components should be checked for inner leaktightness if there is no external coolant loss. There is the possibility, for example, that coolant can find its way over a defective cylinder head gasket into the combustion chamber or over a defective water heat exchanger into the oil circuits.
8	Relieve test pressure in cooling system	To do this actuate pressure relief button on the pressure pump (4)
8	Relieve test pressure in cooling system	Pressure pump	Figure
9	Detach pressure pump (4) on tester cap (3)	Pressure pump	Figure
10	Unscrew tester cap (3) at the expansion reservoir (2)	Test cap	Figure
11	Check coolant level and antifreeze content coolant
	Notes on coolant level		AH20.00-P-1142-01CW
		Coolant mixing ratio	*BF20.00-P-1001-04A
12	Screw cap onto expansion reservoir (2)

CAP FOR RADIATOR OR EXPANSION RESERVOIR

Number	Designation			Cap	2-stage cap
BE20.30-P-1005-01A	Test pressure for pressure-testing cooling system	Overpressure	bar	1, 4	1, 4

COOLANT MIXING RATIO

Number	Designation			ENGINE ALL
BF20.00-P-1001-04A	Coolant mixing ratio	Antifreeze/water	up to -37°C	50/50
		Antifreeze/water	up to -45°C	55/45
		Specification		Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1

Fig 2: Identifying Pressure Pump (124 589 24 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA