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

ENGINES 157 in MODEL 463 

Fig 1: Inspecting Cooling System For Leaks

Courtesy of MERCEDES-BENZ USA

	Removing
	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	Switch on ignition
2	Open engine hood		AR88.40-P-1000GG
	Perform operation step 3 to 14 for leak test on the main circuit
3	Adjust heater to maximum heat output
4	Unscrew cap (1) slowly at expansion reservoir (2) and relieve overpressure
	Checking
5	Check coolant level and antifreeze content coolant	Correct if necessary.
		Mixture ratio for coolant	*BF20.00-P-1001-04A
6	Screw on test cap (3) at the expansion reservoir (2)		Fig 2
7	Connect pressure pump (4) at tester cap (3)		Fig 3
8	Apply test pressure to cooling system	The specified test pressure must not be exceeded. Damage can occur to the cooling system otherwise.	*BE20.30-P-1005-01A
	Checking
9	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 the coolant can find its way over a defective cylinder head gasket into the combustion chamber or over a defective oil-water heat exchanger into the oil circuits.
		Check condition and seating of the Henn coupling and replace catch springs if necessary.	AR09.41-P-1311-01AL
	Install
10	Relieve overpressure at the pressure pump (4) via the valve and remove pressure pump (4)		Fig 3
11	Unscrew test cap (3) at the expansion reservoir (2)		Fig 2
12	Switch off ignition
13	Check coolant level and antifreeze content coolant	Mixture ratio for coolant	*BF20.00-P-1001-04A
	Notes on coolant level		AH20.00-P-1142-01V
14	Screw cap (1) onto expansion reservoir (2)
	Perform operation step 15 to 26 for leak test on the low-temperature circuit
15	Remove center section of engine cover	Ensure correct seating of the engine cover.
16	Unscrew cap (5) slowly at expansion reservoir (6) and relieve overpressure
	Checking
17	Check coolant level and antifreeze content coolant	Correct if necessary.
		Mixture ratio for coolant	*BF20.00-P-1001-04A
18	Screw tester cap (3) onto expansion reservoir (6)		Fig 2
19	Connect pressure pump (4) at tester cap (3)		Fig 3
20	Apply test pressure to cooling system	The specified test pressure must not be exceeded. Damage can occur to the cooling system otherwise.	*BE20.30-P-1005-01A
21	Perform visual inspection on coolant carrying components	Check condition and coolant loss for all coolant carrying components and connections.
	Install
22	Relive overpressure at the pressure pump (4) via the valve and remove pressure pump (4)		Fig 3
23	Unscrew test cap (3) at the expansion reservoir (6)		Fig 2
24	Switch off ignition
25	Check coolant level and antifreeze content coolant	Mixture ratio for coolant	*BF20.00-P-1001-04A
	Notes on coolant level		AH20.00-P-1142-01V
26	Screw cap (5) onto expansion reservoir (6)
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
27	Conduct engine test run and check engine for leaks

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
			up to -45°C	55/45
		Specifications for service products	Sheet	Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
			Sheet	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