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

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ENGINE 278 in MODEL 207 

ENGINE 157, 278 in MODEL 212, 218 

Fig 1: Coolant Thermostat Remove/Install Components
G09975342DANGERREMOVINGINSTALLINGNOTESTORQUE SPECIFICATIONTORQUE SPECIFICATIONNOTESINSTALLATION IMPORTANTINSPECTDANGERCourtesy of MERCEDES-BENZ USA
DANGER Risk of injury  caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof. No parts of the body or limbs should be within the operating area when the components are moving. AS00.00-Z-0011-01A
REMOVINGINSTALLING Remove/install     
1 Switch off ignition    
2 Remove left engine cover (2)    
3 Remove engine air intake duct (4) on left air filter housing    
4 Remove poly-V belt   AR13.20-P-0001ELB
5 Remove upper charge air duct on the left (1l)   AR09.41-P-8620ELB
6 Disconnect electrical connector on coolant thermostat heating element (R48)    
7 Drain coolant ENGINE 278 in MODEL 207 AR20.00-P-1142FH
NOTES Notes on coolant   AH20.00-N-2080-01A
    ENGINE 157, 278 in MODEL 212, 218 AR20.00-P-1142EL 
8 Remove coolant hose on coolant thermostat housing (1)   AR09.41-P-1311-01AL
9 Remove screw/bolt (5) on oil filter housing TORQUE SPECIFICATION Screw/bolt, housing for coolant thermostat to oil filter housing *BA20.10-P-1005-01W 
10 Remove screw/bolts (3) for coolant thermostat housing (1) on coolant pump TORQUE SPECIFICATION Screw/bolt, coolant thermostat housing to coolant pump/oil filter housing *BA20.10-P-1002-01W 
11 Remove coolant thermostat housing (1) NOTES
The coolant thermostat must not be removed from coolant thermostat housing (1).
The coolant thermostat will be destroyed in the process.
INSTALLATION IMPORTANT Replace O-ring and seal.
 
12 Install in the reverse order    
INSPECT Check     
DANGER Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running. Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. AS00.00-Z-0005-01A
13 Perform an engine test run and check engine for leaks    
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 157 ENGINE 278
BA20.10-P-1002-01W Screw/bolt, coolant thermostat housing to coolant pump/oil filter housing Stage 1 Nm 2 2
Stage 2 Nm 9 9
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 157 ENGINE 278
BA20.10-P-1005-01W Screw/bolt, housing for coolant thermostat to oil filter housing Stage 1 Nm 2 2
Stage 2 Nm 9 9