Remove/install camshafts, engine 156.### ## as of 001178 - AR05.20-P-6992AMG (ML63 AMG): Notes

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ENGINE 156.### ## as of 001178

Shown on the right cylinder head

Fig 1: Identifying Camshaft Adjuster, Camshaft Bearing Cap, Camshaft And Bolts

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Tightening sequence on right cylinder head

Fig 2: Tightening Sequence On Right Cylinder Head

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Tightening sequence on left cylinder head

Fig 3: Tightening Sequence On Left Cylinder Head

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing
	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.	AS47.00-Z-0001-01A
	Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Notes on self-locking nuts and bolts	All models	AH00.00-N-0001-01A
	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.	AS54.10-Z-0001-01A
1	Turn key in ignition switch to position "0".	Vehicles with code (889) Keyless Go: Switch off engine, remove Keyless Go cards from vehicle and store outside of the transmission range.
2	Open engine hood and raise to vertical position	Model 216, 221
		Model 164	AR88.40-P-1000GZ
		Model 209	AR88.40-P-1000Q
		Model 211	AR88.40-P-1000T
		Model 219	AR88.40-P-1000TX
		Model 251	AR88.40-P-1000RT
3	Remove partition wall between the wheelhouses	Model 251	AR62.30-P-2400RT
4	Remove air filter housing	Model 164, 251	AR09.10-P-1150GZS
		Model 209, 211, 219	AR09.10-P-1150TMG
		Model 216, 221	AR09.10-P-1150SMG
5	Remove spark plugs	Only if it is not possible to crank the engine due to the high compression.
		Model 164, 251	AR15.12-P-1010GZS
		Model 209, 211, 219	AR15.12-P-1010TMG
		Model 216, 221	AR15.12-P-1010SMG
6	Rotate engine at crankshaft center bolt in direction of rotation of engine to a 40° crankshaft angle after top dead center (TDC) on cylinder 1	Rotate engine at crankshaft in running direction until scribe mark 40° on pulley/ vibration damper corresponds with scribe mark on timing case.
7	Remove cylinder head covers	Model 164, 251	AR01.20-P-5014GZS
		Model 209, 211, 219	AR01.20-P-5014TMG
		Model 216, 221	AR01.20-P-5014SMG
8	Remove all camshaft adjusters (1)	Up to engine number 001177	AR05.20-P-7201ANG
		From engine number 001178	AR05.20-P-7201AMG
9	Remove bolts (2) for camshaft bearing cap (3)	If camshaft bearing caps (3) have no identification markings, the original position must be marked. Interchanged bearing caps can lead to engine damage.	AR05.20-P-6992-09AMG
10	Remove camshafts (4)	Removal: Mark position of camshaft (4) in cylinder head. If the camshafts (4) have no identification markings for the intake and exhaust side, these must be marked.
	Checking
11	Check camshafts (4) and camshaft bearing caps (3) for galling and score marks
	Install
12	Insert the camshafts (4)	Installation: Observe camshaft markings. Oil the bearing surfaces! Camshafts (4) must not be replaced individually for tolerance reasons.
13	Install camshaft bearing caps (3)	Observe tightening procedure.	AR05.20-P-6992-09AMG
			*BA01.30-P-1001-01U
14	Turn camshafts (4) into basic position	Lock camshafts (4) using holding device and straightedge.
		Retainer	Fig 4
15	Install all camshaft adjusters (1)	Up to engine number 001177	AR05.20-P-7201ANG
		From engine number 001178	AR05.20-P-7201AMG
16	Install cylinder head covers	Model 164, 251	AR01.20-P-5014GZS
		Model 209, 211, 219	AR01.20-P-5014TMG
		Model 216, 221	AR01.20-P-5014SMG
17	Install spark plugs	Model 164, 251	AR15.12-P-1010GZS
		Model 209, 211, 219	AR15.12-P-1010TMG
		Model 216, 221	AR15.12-P-1010SMG
18	Install partition wall between the wheelhouses	Model 251 only	AR62.30-P-2400RT
19	Install air filter housing	Model 164, 251	AR09.10-P-1150GZS
		Model 209, 211, 219	AR09.10-P-1150TMG
		Model 216, 221	AR09.10-P-1150SMG
	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
20	Carry out engine test run
21	Close engine hood	Model 216, 221 Model 164	AR88.40-P-1000GZ
		Model 209	AR88.40-P-1000Q
		Model 211	AR88.40-P-1000T
		Model 219	AR88.40-P-1000TX
		Model 251	AR88.40-P-1000RT

CYLINDER HEAD

Number	Designation			Engine 156
BA01.30-P-1001-01U	Bolt, camshaft bearing cap/bearing bridge	M6	Nm	10

Fig 4: Identifying Holding Device (156 589 00 61 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.