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

ENGINE 176, 279, 642 in MODEL 463 

Shown on ENGINE 176 

Fig 1: Inspecting Cooling System For Leaks - Shown On Engine 176

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 level		AH20.00-P-1142-01V
	Notes on coolant		AH20.00-N-2080-01A
	Notes on coolant level		AH20.00-P-1142-01MUB
	Notes on coolant level		AH20.00-P-1142-01MNA
	Remove
1	Switch on ignition
2	Adjust heater to maximum heat output
3	Slowly unscrew cap on coolant expansion reservoir (1) and reduce overpressure
4	Check coolant level and antifreeze content coolant	Engine 279 in model 463 Cooling system	*BF20.00-P-1001-02GA
		Engine 642 in model 463 (except 463.348) Engine 642 in model 463.348Cooling system	*BF20.00-P-1001-02W
		Engine 176 in model 463 Cooling system	*BF20.00-P-1001-06A
5	Screw tester cap (2) onto coolant expansion reservoir (1)	Test cap	Figure
6	Connect pressure pump (3) at tester cap (2)	Pressure pump	Figure
7	Apply a test pressure to the engine cooling system for 2 minutes	Do not exceed the specified test pressure. Damage can occur on the engine cooling system otherwise. There should be no pressure loss within a period of 2 minutes.
		Engine 279, 642 in model 463 1-stage cover latch Test pressure for pressure-testing the engine cooling system	*BE20.30-P-1005-01A
		Engine 176 in model 463 Test pressure for pressure-testing the cooling system In the event of pressure loss ↓ Perform a visual inspection on the assembly parts carrying coolant. Check condition and coolant loss for all assembly part carrying coolant and connections and remove coolant loss if necessary using suitable measures.	*BE20.30-P-1002-01D
	Install
8	Remove overpressure over the valve at the pressure pump (3) and remove pressure pump (3)	Pressure pump	Figure
9	Unscrew tester cap (2) at coolant expansion reservoir (1)	Test cap	Figure
10	Switch off ignition
11	Check coolant level and antifreeze content coolant	Engine 279 in model 463 Cooling system	*BF20.00-P-1001-02GA
		Engine 642 in model 463 (except 463.348) Engine 642 in model 463.348 Cooling system	*BF20.00-P-1001-02W
		Engine 176 in model 463 Cooling system	*BF20.00-P-1001-06A
12	Screw cap onto coolant expansion reservoir (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