Remove/install engine 272 with transmission 722 - AR01.10-P-2400VA

ENGINE 272.942 in MODEL 171.454 with TRANSMISSION 722.9 

ENGINE 272.963 in MODEL 171.456 with TRANSMISSION 722.9 

Fig 1: Identifying Engine Components (1 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Engine Components (2 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Engine Components (3 Of 3)

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death  caused by vehicle slipping or toppling off the lifting platform.	Align vehicle between columns of lifting platform and position four support plates at lifting platform support points specified by vehicle manufacturer.	-
	Risk of explosion  caused by fuel igniting, risk of poisoning  caused by inhaling and swallowing fuel and risk of injury  to eyes and skin caused by contact with fuel.	No fire, sparks, open flames or smoking. Only pour fuels into suitable and appropriately marked containers. Wear protective clothing when handling fuel.	-
	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.	-
	Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.	-
1	Disconnect ground line from battery		AR54.10-P-0003V
	Notes on battery		AH54.10-P-0001-01A
2	Remove air filter housing		AR09.10-P-1150VA
3	Remove fan shroud		AR20.40-P-6800VA
4	Attach guard plate for radiator / condenser
	Guard plate for radiator / condenser		WF58.50-P-0110-01A
5	Remove poly-V belt (1)		AR13.22-P-1202VA
6	Suction off oil out of power steering expansion reservoir (2)	Hand pump	Fig 5
7	Detach return line (3) from power steering expansion reservoir (2)		*BA46.30-P-1004-01F
8	Detach pressure line (4) of power steering from power steering pump by unscrewing the union nut (5)	Installation:  Replace sealing ring.
			*BA46.30-P-1002-01F
9	Detach lower engine compartment paneling		AR61.20-P-1105V
10	Drain coolant from radiator		AR20.00-P-1142VA
11	Drain engine oil	See: ↓
		Engine oil and filter change	AP18.00-P-0101VA
		Installation:  Replace sealing ring.
			*BA01.45-P-1001-01M
			*BF18.00-P-1001-01M
12	Detach pressure line (4) of power steering from oil pan by unscrewing bolt (6)		*BA01.45-P-1004-01M
13	Remove coolant compressor (A9) from timing case cover and engine support by unscrewing bolts (7)	Disconnect refrigerant compressor connector (A9x1) and attach refrigerant compressor (A9) with connected pipe system, laterally at bottom of engine compartment.
			*BA83.55-P-1001-01M
14	Remove oil line (8) for automatic transmission from radiator (9)	Seal connections; otherwise, the automatic transmission can get damaged due to contamination.
		Set of stop plugs	Fig 4
		Installation:  Replace sealing ring. Ensure oil line (8) on automatic transmission is fitted correctly to the radiator (9).
15	Remove retaining clip (10) and detach shift rod (11) at range selector lever (12)	Installation:  Replace retaining clip (10).
16	Remove propeller shaft from drive flange of automatic transmission		AR41.10-P-0050-02V
17	Remove rear engine mount	After removing rear engine mount, lower transmission jack and allow automatic transmission to lie on engine crossmember. Telescoping transmission jack 0.5 - 1.0 ton Passenger car transmission platform	AR22.10-P-1160VA
	Risk of injury  to skin and eyes caused by handling hot or glowing objects. Detach the exhaust system from the exhaust manifolds by unscrewing the bolts (13)	Wear safety gloves, protective clothing and safety glasses, if necessary. Installation:  Clean connecting points of combustion and corrosion residues, replace bolts (13).	-
			*BA49.10-P-1001-01N
19	Remove engine wiring harness to remove engine		AR01.00-P-2410-02VB
20	Remove vacuum line (14) of purge control valve (Y58/1) from vacuum line (15) of crankcase ventilation system.
21	Remove vacuum line (16).	To release vacuum line (16) at intake manifold, press in ring at connection (17) and remove the vacuum line (16).	AR43.10-P-0355VA
22	Remove coolant hose (18)	Inspect condition of coolant hose, replace if necessary.
23	Detach oil line (25) of automatic transmission from radiator (9)	Seal connections; otherwise, the automatic transmission can get damaged due to contamination.
		Set of stop plugs	Fig 4
		Installation:  Replace sealing ring. Ensure that oil line (25) on automatic transmission is fitted correctly to the radiator (9).
24	Detach coolant hose (19) from coolant pump and pull from bracket (20)	Inspect condition of coolant hose, replace if necessary.
25	Detach coolant hose (21) from connection at coolant hose (22)	Inspect condition of coolant hose, replace if necessary.
26	Detach coolant hose (22) from partition wall by disengaging securing clamp	Inspect condition of coolant hose, replace if necessary.
27	Release fuel pressure through service valve		AR07.03-P-1460-01VA
28	Dismount fuel line (23) from fuel distributor	Collect feathering-out fuel and seal connections.
			*BA07.03-P-1001-01B
		Set of stop plugs	Fig 4
29	Disconnect both engine mounts from front axle carrier; to do this unscrew bolts (24)		*BA22.10-P-1006-01O
30	Lift out engine	When lifting out engine ensure that steering coupling is not damaged, no cables and lines are damaged and the engine does not touch the partition wall. Slightly raise engine equally at front and rear, pull slightly forward, lower to the rear and lift out. Engine hoist
31	Install in the reverse order
32	Check oil level in automatic transmission and add oil if necessary		-
33	Fill power steering pump and bleed		AR46.30-P-0010V
	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.	-
34	Carry out engine test run	Check fuel line screw connection (23), oil line connections (8, 25) of automatic transmission, pressure and return line (3, 4) of power steering, connections of coolant hoses (18, 19, 21, 22), exhaust system and oil drain screw for leaks.

Fig 4: Identifying Set Of Stop Plugs (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Hand Pump (210 589 00 71 00)

Courtesy of MERCEDES-BENZ USA