Check low-temperature circuit for leaktightness - AR09.41-P-1011MUD

ENGINE 279 in MODEL 463

Fig 1: Checking Low-Temperature Circuit For Leaktightness

Courtesy of MERCEDES-BENZ USA

	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
	Remove
1	Unscrew cap on expansion reservoir (1)
	Check
2	Check coolant level and antifreeze content of coolant in low-temperature circuit and correct if necessary	Cooling system	*BF20.00-P-1001-02GA
3	Screw tester cap (2) on expansion reservoir (1)	Test cap	Fig 3
4	Connect pressure pump (3) at tester cap (2)	Pressure pump	Fig 2
5	Apply compressed air to low-temperature circuit for 2 minutes at the test pressure	Do not exceed the specified test pressure. Damage can occur otherwise on the low- temperature circuit. There should be no pressure loss within a period of 2 minutes.
5		Engine 279 in model 463Test pressure for pressure-testing the engine cooling system In the event of pressure loss: ↓ Perform a visual inspection on the components carrying coolant Check condition and coolant loss for all coolant carrying components and connections and remove coolant loss if necessary using suitable measures.	*BE20.30-P-1005-01A
	Install
6	Actuate pressure relief button on pressure pump (3) and relieve the pressure	Pressure pump	Fig 2
7	Unscrew tester cap (2) at the expansion reservoir (1)	Test cap	Fig 3
	Check
8	Check coolant level and antifreeze content of coolant and correct if necessary	Engine 279 in model 463Cooling system	*BF20.00-P-1001-02GA
9	Screw cap onto expansion reservoir (1)

RADIATOR OR EXPANSION RESERVOIR CAP

Number	Designation			1-stage cover latch	2-stage cover latch
BE20.30-P-1005-01A	Test pressure for pressure-testing the engine cooling system	Overpressure	bar	1, 4	1, 4

COOLING SYSTEM

Number	Designation				Engine 279 in model 463
BF20.00-P-1001-02GA	Cooling system	Workshop replacement amount	Main circuit	Liter	≈ 14, 0
		Workshop replacement amount	Low-temperature circuit	Liter	≈ 5, 0
		Antifreeze/water	Down to -37°C	%	50/50
			-38°C and below	%	55/45
			Specifications for Operating Fluids, sheet		Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
			Specifications for Operating Fluids, sheet		Anticorrosion agent/antifreeze (Specification 325.6). See https://bevo.mercedes-benz.com/index.php?language_id=1
			Specifications for Operating Fluids, sheet		Premixed coolant (Specification 326.6). 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