Remove/install circulation pump for low-temperature water circuit - AR09.41-P-6925MMB

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ENGINE 157, 278 in MODEL 212, 216, 218, 221

ENGINE 278 in MODEL 207

Shown on model 216 with engine 278

Fig 1: Circulation Pump Remove/Install Components - Shown On Model 216 (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Shown on model 207 with engine 278 and code (139) Measures for engine cooling M157/M278

Fig 2: Circulation Pump Remove/Install Components - Shown On Model 207 (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from 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
	Risk of death caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
1	Remove bottom engine compartment paneling	Model 216, model 221 except code (Z07) Top protection	AR61.20-P-1105SX
1	Remove bottom engine compartment paneling	Model 207, 212, 218	AR61.20-P-1105EW
2.1	Drain coolant	Vehicles without code (139) Measures for engine cooling M157/M278
	Notes on coolant		AH20.00-N-2080-01A
		MODEL 207	AR20.00-P-1142FH
		MODEL 212, 218	AR20.00-P-1142EL
		Model 216, 221	AR20.00-P-1142MM
2.2	Drain coolant in low-temperature circuit	Vehicles with code (139) Measures for engine cooling M157/M278
	Notes on coolant		AH20.00-N-2080-01A
		The coolant drain plug for the low-temperature circuit is located in the low-temperature circuit hose package at the front right in engine compartment. The low-temperature circuit coolant expansion reservoir is located under the center engine cover.
3	Detach electrical connection (2) from charge air cooler circulation pump (M44)
4	Unscrew nuts (8) and remove air duct (7)	Vehicles with code (139) Measures for engine cooling M157/M278
5.1	Remove screw/bolt (3) and remove the bracket (4)	Vehicles without code (139) Measures for engine cooling M157/M278
5.2	Remove screw/bolt (3) and remove charge air cooler circulation pump (M44) together with bracket (4) and elastomer bearing from bracket on longitudinal member	Vehicles with code (139) Measures for engine cooling M157/M278
6	Detach hoses (5, 6) on charge air cooler circulation pump (M44)
7	Remove circulation pump for charge air cooler (M44)
8	Install in the reverse order
	Check
9.1	Check cooling system for leaktightness	Vehicles without code (139) Measures for engine cooling M157/M278 MODEL 207	AR20.00-P-1010FH
		MODEL 212, 218	AR20.00-P-1010EL
		Model 216, 221	AR20.00-P-1010SX
9.2	Check low-temperature circuit cooling system for leaktightness	Vehicles with code (139) Measures for engine cooling M157/M278 MODEL 207	AR20.00-P-1010FH
9.2		MODEL 212, 218 Attach tester cap on low-temperature circuit coolant expansion reservoir and apply test pressure to low-temperature circuit.	AR20.00-P-1010EL
	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
10	Perform an engine test run; check cooling system for function and leaktightness