Remove/install coolant pump - AR20.10-P-1271CMG

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ENGINE 156 in MODEL 204, 212

Fig 1: Coolant Pump 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 columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
1	Switch off ignition
2	Remove front engine cover and both engine air intake ducts upstream of the air filter	Do not tilt front engine cover, but lift upwards vertically otherwise the retaining lugs can break off.
3	Remove bottom engine compartment paneling	Only install lower engine compartment paneling after leak test.
4	Drain coolant at radiator		AR20.00-P-1142CMG
	Notes on coolant		AH20.00-N-2080-01A
5	Loosen bolts of belt pulley (2)
6	Remove poly-V belt (3)		AR13.20-P-0001CMG
7	Detach belt pulley (2) from coolant pump (1) by unscrewing bolts of the belt pulley (2)		*BA13.25-P-1002-01U
8	Detach overflow line from coolant thermostat housing to expansion reservoir for coolant
9	Remove expansion reservoir of the power steering and set aside with the connected oil lines		AR46.25-P-1000CMG
10	Remove guide pulleys (4, 5) from coolant pump (1)		AR13.20-P-0001CMG
11	Detach coolant hose from the coolant thermostat housing to the radiator and place it to one side	Replace O-ring.
12	Remove guide pulley (6) from timing case cover		AR13.20-P-0001CMG
13	Detach coolant hose (9) on coolant pump (1)	Check the condition of coolant hose and hose clamps and replace if necessary.
14	Unscrew bolts (7, 8) and detach coolant pump (1) from timing case cover	Install new gasket
14			*BA20.10-P-1001-01V
15	Clean sealing surface on timing case cover	Clean the sealing surface with clean rags; otherwise, leaks can occur.
16	Clean sealing surface on coolant pump (1)	Only when reusing coolant pump (1).
17	Install in the reverse order
18	Inspecting cooling system for leaks		AR20.00-P-1010CMG
	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
19	Conduct engine test run and check engine for leaks

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation			ENGINE 156
BA20.10-P-1001-01V	Bolt, coolant pump to timing case cover and crankcase	M6X30	Nm	9
		M6X80	Nm	9
		M8X80	Nm	20
		M8X100	Nm	20

BELT TENSIONING DEVICE

Number	Designation			ENGINE 156, 159
BA13.25-P-1002-01U	Bolt, pulley to coolant pump	M6	Nm	8.5