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

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ENGINE 272, 273 in MODEL 212 

Fig 1: Coolant Thermostat Remove/Install Components
G09975344Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Drain coolant at radiator   AR20.00-P-1142EWS 
NOTES Notes on coolant   AH20.00-N-2080-01A
2 Remove left engine intake air duct and front engine cover See Remove air filter housing. AR09.10-P-1150EWS
3 Remove upper coolant hose (1) from coolant thermostat housing (2) INSTALLATION IMPORTANT Replace O-ring (1a).  
4 Remove poly-V belt and guide pulley (3)   AR13.20-P-0001EWS
5 Release and disconnect electrical connector on coolant thermostat (Y110)    
6 Remove bolts (2a) and pull coolant thermostat housing (2) with coolant thermostat out timing case cover TORQUE SPECIFICATION
INSTALLATION IMPORTANT Replace gasket (2b) and O-ring (2c).
*BA20.10-P-1003-01U 
7 Install in the reverse order    
INSPECT Checking     
DANGER 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
8 Warm up engine to normal operating temperature, perform function test for coolant thermostat and check engine for leaktightness    
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation ENGINE 272 ENGINE 273
BA20.10-P-1003-01U Bolt, coolant thermostat housing to timing case cover Nm 25 25