Remove/install timing case cover - AR01.40-P-8000SX

ENGINES 272.946/965/974/975 in MODEL 221 

ENGINES 273.922/924/961/968 in MODEL 221 

ENGINES 273.961/968 in MODEL 216 

Shown on engine 272.946 

Fig 1: Identifying Timing Case Cover Remove/Install Components - Shown On Engine 272.946

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  caused by fingers being pinched or crushed  when removing, installing or aligning hoods, doors, trunk lids, liftgates or sliding roof	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Risk of death  when touching components on vehicles with high-voltage on-board electrical system	Do not touch components and open lines of the high-voltage on-board electrical system. Persons who are carriers of electronic implants (e.g. cardiac pacemakers), must not  carry out any work on high-voltage on-board electrical systems.	AS54.00-Z-0001-01A
1	Perform disable for the high-voltage on-board electrical system	Model 221.095/195 After completing the work, attach initial startup event log together with the disconnection log to the vehicle file.	AR54.10-P-1150SXH
	Note on the high-voltage on-board electrical system		AH54.00-P-0010-01A
2	Turn key in ignition lock to position "0"	Vehicles with code (889) Keyless-Go: Press Keyless-Go start/stop button repeatedly until ignition is switched off.
3	Remove air filter housing with engine air intake ducts		AR09.10-P-1150SX
4	Remove lower engine compartment paneling		AR61.20-P-1105SX
5	Drain engine oil		AP18.00-P-0101SX
	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
6	Drain coolant at radiator		AR20.00-P-1142SX
	Notes on coolant		AH20.00-N-2080-01A
7	Disconnect coolant hose on coolant temperature regulator housing
8	Detach coolant hose (3) from coolant pump
9	Remove fan shroud		AR20.40-P-6800SX
10	Attach guard plate for radiator/condenser
	Guard plate for radiator/condenser		WF58.50-P-0110-01A
11.1	Remove poly-V belt, tensioning device and guide pulley (2)	Except model 221.095/195 with a twin belt drive	AR13.20-P-0001SX
	Version of the poly-V belt altered	Model 221.095/195	BT13.20-P-1000-01SXH
11.2	Remove both V-belts	Model 221.095/195 with twin belt drive	AR13.22-P-1202SXH
	Version of the poly-V belt altered	Model 221.095/195	BT13.20-P-1000-01SXH
12	Remove air pump		AR14.30-P-7251SX
13	Remove coolant temperature control housing	Install new O-ring and seal.	AR20.10-P-2460SX
14	Remove oil filter housing with oil-water heat exchanger		AR18.20-P-3471SX
15	Remove power steering expansion reservoir	Vehicles with AIRmatic except model 221.095/195	AR46.25-P-1000SX
16	Remove left and right air shutoff valve		AR14.30-P-7200SX
17	Remove intermediate flange (1) of air shutoff valve		*BA14.30-P-1004-02A
18	Rotate engine at crankshaft center bolt in direction of rotation of engine to a 40° crankshaft angle after ignition TDC		Figure
19	Install retaining lock for crankshaft/starter ring gear	Except model 221.095/195	AR03.30-P-5000SX
20	Remove belt pulley/vibration damper		AR03.30-P-1600SX
21	Remove front cover at left cylinder head	After installing the front cover, check that the camshafts are positioned at 55° crank angle BTDC: ↓	AR01.30-P-5700SX
		Check basic position of camshafts.	AR05.20-P-6010SX
22	Remove front cover at the right cylinder head	After installing the front cover, check that the camshafts are positioned at 55° crank angle BTDC: ↓	AR01.30-P-5700SY
		Check basic position of camshafts.	AR05.20-P-6010SX
23	Remove chain tensioner	Install new chain tensioner.  The previously installed chain tensioner must not be reinstalled because during removal, its pressure pin is pressed into the end position. The thrust pin latch prevents this return stroke. This would overstretch the timing chain on reinstalling.	AR05.10-P-7800SX
24	Remove camshaft adjuster for exhaust camshafts.		AR05.20-P-7201SY
25	Remove camshaft adjuster for intake camshafts.		AR05.20-P-7201SX
26	Remove alternator	Model 216, 221 except model 221.095/195	AR15.40-P-5032SX
		Model 221.095/195	AR15.40-P-5032SXH
27	Remove alternator bracket from timing case cover and coolant pump (7)	Model 221.095/195
			*BA15.40-P-1010-01F
28	Remove the oil dipstick guide tube	Model 221 except 221.08/18 model 216 except 216.38	AR18.40-P-3510SX
		Model 221.08/18, model 216.38	AR18.40-P-3510SW
29	Unfasten center bolt on crankshaft vibration damper		AR03.30-P-1600SX
30.1	Detach power steering pump (8) from timing case cover (7) and put it on the side with connected line	Model 221 with AIRmatic except 221.08/09/18/19	AR46.30-P-0500SX
		Model 221.08/18, 216.38	AR46.30-P-0500SYZ
30.2	Detach tandem pump from timing case cover (7) and place to one side with lines connected	Vehicles with code (487) Active Body Control (ABC)	AR46.30-P-0500SY
31	Remove refrigerant compressor (A9) or electrical A/C compressor (A9/5) place to one side with lines attached and secure against falling down	Except model 221.095/195	AR83.55-P-5300SX
		Model 221.095/195	AR83.55-P-5300SXH
32	Remove bracket from electrical vacuum pump	Model 221.095/195
33	Remove oil pan	If the oil pan cannot be released from the crankcase, warm oil pan in area of sealing surface with a hot air gun, then push mounting wedge between sealing surface to separate oil pan of oil pan.
		Engine 272 in model 221	AR01.45-P-7500SY
		Engine 273 in model 216, 221 except 221.08/18, 216.38	AR01.45-P-7500SX
		Engine 273 in 221.08/18, 216.38	AR01.45-P-7500SW
34	Remove screw/bolts (12, 13)		*BA01.30-P-1003-01O
35	Detach timing case cover (7)	Observe different bolt lengths and diameters: ↓
		Bolt plan for timing case cover:	AR01.40-P-8000-01VA
		Engine 272	*BA01.40-P-1001-01G
		Engine 273 Replace crankshaft radial sealing ring (9). Replace both sealing rings in timing case cover (7) and apply sealant to sealing surface of the timing case cover (7): ↓	*BA01.40-P-1001-01T
		Notes on sealant path for timing case cover	AH01.40-P-1000-01VA
			Figure
		Loctite 5970 sealant	*BR00.45-Z-1013-01A
	Clean
36	Clean oil pan sealing surfaces, oil pan bottom section and timing case cover (7)	Do not use any sharp-edged tools or abrasive paper. The sealing surfaces will be damaged otherwise.	AR01.00-P-0050-01A
		Loctite 7200	*BR00.45-Z-1038-04A
		Loctite 7063 cleaning spray (150 ml)	*BR00.45-Z-1046-04A
37	Install in the reverse order
38	Check engine oil level; correct if necessary		AP18.00-P-0101SX
	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
39	Carry out an engine test run and check engine for leaks
40	Inspecting cooling system for leaks		AR20.00-P-1010SX

Fig 2: Identifying Squeeze Gun (112 589 00 25 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Wrench Socket (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA