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

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ENGINES 642 in MODELS 207, 212, 218 

Shown on engine 642.850 

Fig 1: Coolant Thermostat Remove/Install Components - Shown On Model 642.850
G09975345Courtesy of MERCEDES-BENZ USA

Shown on ENGINE 642.852 

Fig 2: Coolant Thermostat Remove/Install Components - Shown On Model 642.852
G09975346Courtesy of MERCEDES-BENZ USA

Turbocharger without coolant cooling 

Fig 3: Coolant Thermostat Remove/Install Components - Turbocharger Without Coolant Cooling
G09975347Courtesy of MERCEDES-BENZ USA

Turbocharger with coolant cooling 

Fig 4: Coolant Thermostat Remove/Install Components - Turbocharger With Coolant Cooling
G09975348Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer. AS00.00-Z-0010-01A
DANGER 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 Notes on coolant   AH20.00-N-2080-01A
1 Remove engine trim panel INSTALLATION IMPORTANT Ensure correct seating of the engine cover.  
2 Remove engine charge air duct on turbocharger (14b) Engines with a turbocharger (14b) with coolant cooling AR09.41-P-8622SXI
3 Drain coolant Model 207 AR20.00-P-1142CW
Model 212, 218
IMPORTANT Catch coolant in suitable vessel
AR20.00-P-1142OGE 
4 Remove coolant hose (3) out of the thermostat housing holder (1)    
5 Disconnect electrical connector for coolant thermostat heating element (R48) For vehicles with a heated coolant thermostat  
6 Disconnect coolant hose (4) at thermostat housing (1) IMPORTANT Henn coupling
INSTALLATION IMPORTANT In order to avoid leaks on engine, check sealing rings and detent springs for damage, thoroughly clean connecting points but do not grease, and also observe exact seating of detent springs.
AR09.41-P-1311-01AL
7 Remove securing clip (6) and take connector (7) for the fuel line (8) out of the bracket Engines with a turbocharger (14b) with coolant cooling  
8 Remove bolts (5) Engines with a turbocharger (14b) with coolant cooling  
9 Unscrew bolts (2, 9) NOTES For engines with turbocharger (14b) with coolant cooling: the fuel line (8) must be pushed slightly to the side to pass the bolt (9) by at the fuel line (8). This must not be bent to avoid causing damage to the fuel line (8).  
TORQUE SPECIFICATION *BA20.10-P-1002-01S 
10 Remove thermostat housing (1) with coolant thermostat INSTALLATION IMPORTANT Replace sealing ring.  
11 Install in the reverse order    
INSPECT Checking     
12 Pour in coolant and bleed cooling system   AR20.00-P-1142-04A 
    SPECIAL TOOL Tester cap Figure
    SPECIAL TOOL Cooler vacuum filling device Figure
REFER TO CAPACITIES & SPECIFICATIONS Coolant specifications Specification 310.1 Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
REFER TO CAPACITIES & SPECIFICATIONS 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
    FLUID SPECIFICATION Mixture ratio for coolant *BF20.00-P-1001-04A 
13 Inspect cooling system for leaks Model 207 AR20.00-P-1010CW 
Model 212, 218 AR20.00-P-1010OMA 
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 642
BA20.10-P-1002-01S Bolt, coolant thermostat housing to charge air manifold Nm 9
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 Specification Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
Specification Anticorrosion/antifreeze agents (Specification 325.0). See https://bevo.mercedes-benz.com/index.php?language_id=1
Fig 5: Identifying Test Cap (210 589 00 91 00)
G09975349Courtesy of MERCEDES-BENZ USA
Fig 6: Identifying Vacuum-Type Cooling System Filler (285 589 00 21 00)
G09975350Courtesy of MERCEDES-BENZ USA