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

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ENGINES 271, 272, 642, 646, 651 in MODEL 204

ENGINES 271, 272, 273, 642, 651 in MODEL 207

ENGINES 271, 642, 651 in MODEL 212

ENGINES 271, 651 in MODEL 172

Shown on ENGINE 642 in MODEL 212

Fig 1: Inspecting Cooling System For Leaks

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

15.6.10

Scope of testing extended

Operation step 7

	Checking
	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	Adjust heater to maximum heat output
2	Unscrew cap (1) slowly at expansion reservoir (2) and relieve overpressure
3	Check coolant level	Mixture ratio for coolant	*BF20.00-P-1001-04A
	Notes on coolant level	Models 204, 207, 212	AH20.00-P-1142-01CW
	Notes on coolant level	Model 172	AH20.00-P-1142-01V
4	Screw on test cap (3) at the expansion reservoir (2)	Tester cap	Figure
5	Connect pressure pump (4) at tester cap (3)	Pressure pump	Figure
6	Apply test pressure to cooling system	The specified test pressure must not be exceeded. The cooling system can be damaged otherwise.
6	Apply test pressure to cooling system	Test pressure for pressure-testing cooling system	*BE20.30-P-1005-01A
7	Perform visual inspection on coolant carrying components	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 heat exchanger into the oil circuits. Check condition and seating of the Henn coupling. Replace catch springs as required to avoid coolant loss. see ↓
7	Perform visual inspection on coolant carrying components	Open and close Henn coupling	AR09.41-P-1311-01AL
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) at test cap (3)	Pressure pump	Figure
10	Unscrew test cap (3) at the expansion reservoir (2)	Tester cap	Figure
11	Check coolant level and antifreeze content coolant	Mixture ratio for coolant	*BF20.00-P-1001-04A
	Notes on coolant level	Models 204, 207, 212	AH20.00-P-1142-01CW
	Notes on coolant level	Model 172	AH20.00-P-1142-01V
12	Screw cap onto expansion reservoir (2)

CAP FOR RADIATOR OR EXPANSION RESERVOIR

Number	Designation		2-stage cap
BE20.30-P-1005-01A	Test pressure for pressure-testing cooling system	bar gauge	1.4

MIXTURE RATIO FOR COOLANT

Number	Designation			ENGINE ALL
BF20.00-P-1001-04A	Mixture ratio for coolant	Antifreeze/water	up to -37°C	50/50
		Antifreeze/water	up to -45°C	55/45
		Specifications for service products	Specification	Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
		Specifications for service products	Specification	Anticorrosion/antifreeze agents (Specification 325.0). See https://bevo.mercedes-benz.com/index.php?language_id=1

Fig 2: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Pressure Pump (124 589 24 21 00)

Courtesy of MERCEDES-BENZ USA