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

ENGINE 157, 278 in model 217 

ENGINE 157, 278 in MODEL 222 

Fig 1: Low-Temperature Water Circuit Circulation Pump Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	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 the vehicle manufacturer.	AS00.00-Z-0010-01A
	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
	Notes on coolant		AH20.00-N-2080-01A
	Remove/install
1	Drain coolant		AR20.00-P-1142LF
2	Drain coolant from low-temperature circuit	To this unlock clamp on grommet (6) and pull out grommet (6) downwards. The low-temperature circuit coolant expansion reservoir is located under the center engine cover.
3	Disconnect electrical connection (4) on charge air cooler circulation pump (M44)
4	Remove screw/bolt (3) and remove the bracket (5)
5	Detach coolant hoses (1, 2) at charge air cooler circulation pump (M44)
6	Remove circulation pump for charge air cooler (M44)
7	Install in the reverse order
8	Check engine cooling system for leaktightness		AR20.00-P-1010LF
9	Check engine cooling system low-temperature circuit for leaktightness	Attach tester cap to coolant expansion reservoir low-temperature circuit and apply the test pressure to the low-temperature circuit. Test pressure for pressure-testing the engine cooling system	*BE20.30-P-1005-01A
		Pressure pump	Figure
		Test cap	Figure
	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 engine cooling system for proper operation

RADIATOR OR EXPANSION RESERVOIR CAP

Number	Designation			1-stage cover latch	2-stage cover latch
BE20.30-P-1005-01A	Test pressure for pressure-testing the engine cooling system	Overpressure	bar	1, 4	1, 4

Fig 2: Identifying Pressure Pump (124 589 24 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA