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

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ENGINE 272, 273 in MODEL 212

Fig 1: Coolant Pump Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
1	Switch off ignition
2	Open engine hood		AR88.40-P-1000EW
3	Drain coolant at radiator		AR20.00-P-1142EWS
	Notes on coolant		AH20.00-N-2080-01A
4	Detach coolant hose (1) from coolant pump (2)		AR09.41-P-1311-01AL
4	Detach coolant hose (1) from coolant pump (2)	Replace sealing ring on coolant hose (1).
5	Remove poly-V belt		AR13.20-P-0001EWS
6	Remove right engine air intake duct and front engine cover		AR09.10-P-1150EWS
6	Remove right engine air intake duct and front engine cover	See Remove air filter housing.
7	Detach electric air pump (M33) with bracket and lay to the rear		AR14.30-P-7251EW
8	Remove guide pulleys (3)		AR13.20-P-0001EWS
9	Remove screw/bolts and coolant pump (2) from timing case cover	Bolt plan for coolant pump Replace seal (2d) and observe bolt plan.	AR20.10-P-1271-03VA
		Self-tapping bolt connecting coolant pump to timing case cover	*BA20.10-P-1001-01U
		Bolt, coolant pump to cylinder crankcase	*BA20.10-P-1002-01U
	Clean
10	Clean sealing surfaces on coolant pump (2) and timing case cover
11	Install in the reverse order
12	Check cooling system for leaktightness		AR20.00-P-1010EW
	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 engine test run and check coolant pump (2) for leaktightness

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation				ENGINE 272	ENGINE 273
BA20.10-P-1002-01U	Bolt, coolant pump to cylinder crankcase	M8	Stage 1	Nm	5	5
BA20.10-P-1002-01U	Bolt, coolant pump to cylinder crankcase	M8	Stage 2	Nm	20	20

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation				ENGINE 272	ENGINE 273
BA20.10-P-1001-01U	Self-tapping bolt connecting coolant pump to timing case cover	M7	Stage 1	Nm	10	10
BA20.10-P-1001-01U		M7	Stage 2	Nm	25	25