Remove/install coolant thermostat - AR20.10-P-2460OGR

ENGINE 642 in MODEL 166 

MODIFICATION NOTES

26.9.14

Coolant Mixing Ratio

*BF20.00-P-1001-04A

Fig 1: Identifying Coolant Thermostat Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	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
1	Remove engine cover	Ensure correct seating of the engine cover.
2	Remove engine charge air duct on ATL		AR09.41-P-8622OGR
3	Drain coolant at radiator		AR20.00-P-1142GQ
	Notes on coolant		AH20.00-N-2080-01A
		Catch coolant in suitable vessel.
4	Remove coolant hose (3) out of the thermostat housing bracket (1)
5	Disconnect electrical connection on two-disk thermostat heating element (R48)	For vehicles with a heated coolant thermostat
6	Disconnect coolant hose (4) at thermostat housing (1)	Check sealing rings and catch springs for damage. In this way one can avoid leaks on the engine. Thoroughly clean connection but do not grease and ensure exact seating of the catch springs: ↓
		Open and close coupling	AR09.41-P-1311-01AL
7	Remove securing clip (6) and take connector (7) for the fuel line (8) out of the bracket
8	Remove screw/bolts (5)
9	Remove screw/bolts (2, 9)	Do not bend the fuel lines. This prevents leaks occurring. The fuel line (8) must be pushed slightly to the side to pass the screw/bolt (9) by at the fuel line (8).
		Bolt, coolant thermostat housing to charge air manifold	*BA20.10-P-1002-01S
10	Remove thermostat housing (1) with coolant thermostat	Replace sealing ring.
11	Install in the reverse order
12	Pour in coolant and bleed cooling system		AR20.00-P-1142-04A
	Coolant specifications	Specification 310.1	Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
	Anticorrosion/antifreeze agents (Specification 325.0)	Specification 325.0	Anticorrosion/antifreeze agents (Specification 325.0). See https://bevo.mercedes-benz.com/index.php?language_id=1
		Coolant mixing ratio	*BF20.00-P-1001-04A
		Test cap	Figure
		Cooler vacuum filling device	Figure
	Check
13	Check cooling system for leak tightness		AR20.00-P-1010GQ

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation		ENGINE 642
BA20.10-P-1002-01S	Bolt, coolant thermostat housing to charge air manifold	Nm	9

COOLANT MIXING RATIO

Number	Designation			ENGINE ALL
*BF20.00-P-1001-04A	Coolant mixing ratio	Antifreeze/water	bis -37°C	50/50
		Antifreeze/water	bis -45°C	55/45
		Specification		Coolant (Specification 310.1). 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 Cooler Vacuum Filling Device (285 589 00 21 00)

Courtesy of MERCEDES-BENZ USA