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

ENGINES 275 in MODELS 215, 216, 220, 221, 230 

Fig 1: Identifying Coolant Pump Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	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
1	Drain coolant at radiator		AR20.00-P-1142H
	Notes on coolant		AH20.00-N-2080-01A
2.1	Remove fan shroud	Model 216, 221 except 216.379, 221.179	AR20.40-P-6800SZ
		Model 216.379, 221.179	AR20.40-P-6800SXM
		Model 215.376, 220.176, 230 without code (P99) Special model "AMG Black Series"	AR20.40-P-6800AC
		Model 215.379, 220.179	AR20.40-P-6800IM
2.2	Remove fan unit	Model 230 with code (P99) Special model "AMG Black Series"	AR20.40-P-5050RBS
3	Slacken bolts (1) for the pulley (2) at coolant pump (3)		*BA20.10-P-1002-01C
4	Remove poly-V belt	Model 215, 220, 230	AR13.22-P-1202L
		Model 216, 221	AR13.20-P-0001SZ
5	Detach belt pulley (2) from coolant pump (3)
6	Remove coolant hoses (4, 5) from coolant pump (3)	Inspect condition of coolant hoses (4, 5) and hose clamps. Replace if required.
7	Remove belt pulley/vibration damper (9)		AR03.30-P-1600L
8	Detach guide pulley (6) from front cover.		*BA01.30-P-1002-01G
9	Detach guide pulley (10)		*BA01.40-P-1006-01C
10	Remove bolts (7) and take off coolant pump (3)	Install new seal (8). Observe length of bolts and tightening sequence:
		Bolt plan for coolant pump (3)	AR20.10-P-1271-03L
			*BA20.10-P-1004-01C
11	Install in the reverse order
	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
12	Inspect cooling system for leaks	Model 215, 220, 230	AR20.00-P-1010HA
		Model 216, 221	AR20.00-P-1010SX

CYLINDER HEAD

Number	Designation			Engine 275
BA01.30-P-1002-01G	Bolt, guide pulley to front cover on right	M8	Nm	35

CRANKCASE, TIMING CASE COVER, END COVER

Number	Designation		Engine 275, 285
BA01.40-P-1006-01C	Bolt, pulley to timing case cover	Nm	35

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation			Engines 137, 275
BA20.10-P-1002-01C	Belt pulley on coolant pump		Nm	8
BA20.10-P-1004-01C	Coolant pump on timing case	M7	Nm	14