Remove/install camshafts - AR05.20-P-6992CD

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ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221

MODIFICATION NOTES

10.11.10

Work procedure revised

Fig 1: Camshafts Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove
	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
1	Remove cylinder head cover trim
2	Remove cylinder head cover	Remove/install cylinder head cover	AR01.20-P-5014CD
3.1	Rotate engine at crankshaft using the counterholder in direction of engine rotation and place piston for cylinder 1 at top dead center (ignition TDC)	Except code (B03) ECO start/stop function Do not crank engine at screw/bolts (1) for camshaft sprockets (2). The engine must not be turned back. The timing chain (3) can skip otherwise and cause engine damage.
		The 0° marking on belt pulley/vibration damper must align with marking on the cylinder crankcase. The tip (8) must be flush with the marking (9) on the camshaft bearing cap (4 or 5). Turn crankshaft another revolution to 0° if necessary. Counterholder	Fig 2
3.2	Rotate engine at crankshaft using a suitable tool in direction of engine rotation and set the piston on cylinder 1 to ignition TDC	With code (B03) ECO start/stop function Do not crank engine at screw/bolts (1) for camshaft sprockets (2). The engine must not be turned back. The timing chain (3) can skip otherwise and cause engine damage. The 0° marking on belt pulley/vibration damper must align with marking on the cylinder crankcase. The tip (8) must be flush with the marking (9) on the camshaft bearing cap (4, 5). Turn crankshaft another revolution to 0° if necessary.
4	Remove chain tensioner	Remove/install chain tensioner	AR05.10-P-7800CD
5	Mark timing chain (3) relative to the camshaft sprockets (2)
6	Remove screw/bolts for camshaft bearing cap (4, 5) step by step and remove camshaft bearing cap (4, 5)	Remove/install camshaft bearing caps	AR05.20-P-6992-04CD
7	Unhook intake camshaft (6) and exhaust camshaft (7) from timing chain (3) and remove	Cover timing case shaft with clean rags. Engine damage can occur otherwise. Secure timing chain (3) against falling down.
8	Remove screw/bolts (1) and camshaft sprockets (2) at intake camshaft (6) or exhaust camshaft (7)	When replacing the camshaft sprockets (2) Observe left-hand thread!
	Install
9	Push camshaft sprockets (2) onto intake camshaft (6) and exhaust camshaft (7) and tighten screw/bolts (1) finger-tight	If camshaft sprockets (2) or intake camshaft (6) or exhaust camshaft (7) were replaced
10	Hook intake camshaft (6) and exhaust camshaft (7) into timing chain (3) and lay in bearing halves of the cylinder head	Note the marking on the timing chain (3). Lubricate roller-type cam follower and camshaft bearing points. Insert intake camshaft (6) and exhaust camshaft (7) in such a way that the tip (8) is aligned with the marking (9).
11	Install camshaft bearing cap (4, 5)	Remove/install camshaft bearing caps Install camshaft bearing caps (4, 5) in the reverse order at the same point. Tighten bearing cap bolts evenly in steps of one turn each. The intake camshaft (6) and the exhaust camshaft (7) are very fragile. Ensure unstressed assembly in order to avoid damage to the intake camshaft (6) and the exhaust camshaft (7).	AR05.20-P-6992-04CD
		Screw/bolt, camshaft bearing cap to cylinder head	*BA05.20-P-1002-01N
12	Install chain tensioner Remove/install chain tensioner		AR05.10-P-7800CD
13	Tighten down camshaft sprocket (2)	If camshaft sprockets (2) or intake camshaft (6) or exhaust camshaft (7) were replaced
		Screw/bolt, camshaft sprocket to camshaft	*BA05.20-P-1001-01N
14	Check basic position of camshafts	Check basic position of camshafts	AR05.20-P-6010CD
		Set basic position of camshafts	AR05.20-P-6020CD
		Adjust intake camshaft (6) and exhaust camshaft (7) if necessary: See: ↓
15	Install cylinder head cover	Remove/install cylinder head cover	AR01.20-P-5014CD
16	Install cylinder head cover trim
	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
	Risk of explosion caused by fuel igniting. Risk of injury to skin and eyes caused by fuel spraying out at high pressure	Keep all ignition sources out of hazard area. Do not carry out any work on system when it is pressurized.	AS07.16-Z-0001-01A
17	Check oil leaktightness and check fuel system for leaks with engine running
18	Connect STAR DIAGNOSIS, read out fault memory and cleared if required
	Connect STAR DIAGNOSIS and read out fault memory	Stored faults which may be caused by assembly work, test work, removed lines or a simulation, must be processed and cleared in fault memories after completing the work.	AD00.00-P-2000-04A

CAMSHAFT

Number	Designation			ENGINE 651
BA05.20-P-1002-01N	Screw/bolt, camshaft bearing cap to cylinder head	Stage 1	Nm	5
BA05.20-P-1002-01N	Screw/bolt, camshaft bearing cap to cylinder head	Stage 2	Nm	9

CAMSHAFT

Number	Designation			ENGINE 651
BA05.20-P-1001-01N	Screw/bolt, camshaft sprocket to camshaft	Stage 1	Nm	55
BA05.20-P-1001-01N	Screw/bolt, camshaft sprocket to camshaft	Stage 2	∠°	90

Fig 2: Identifying Counterholder (651 589 00 40 00)

Courtesy of MERCEDES-BENZ USA