Remove/install camshaft adjusters, exhaust - AR05.20-P-7201GZA (ML350, ML550, GL450, GL550): Notes

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ENGINES 272, 273 in MODEL 164, 251

Camshaft adjuster for exhaust camshafts

Fig 1: Identifying Camshaft Adjuster And Exhaust Camshafts Components Location

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Right Camshaft Adjuster, Dowel Pin And Camshaft Adjuster

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Camshaft Adjuster And Camshaft

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

MODIFICATION NOTES

14.9.07

Use the Torx screwdriver bit T60 to counterhold camshafts, added

AR05.20-P-7201-06VA

	Remove/install
1	Turn key in ignition lock to position "0"	Vehicles with code 889 Keyless Go: Press Keyless Go start/stop button repeatedly until the ignition is switched off. Remove the Keyless Go transmitter card or transmitter key from vehicle and store beyond reach of the transmitter (at least 2 m).
2	Remove air filter housing		AR09.10-P-1150GZA
3	Remove front cover at respective cylinder head	Left cylinder head	AR01.30-P-5700GZA
		Right cylinder head	AR01.30-P-5700GZC
4.1	Remove centrifuge	When removing from camshaft adjuster on the right (13). AR01.20-P-2100GZA
4.2	Remove cap (26)	When removing from camshaft adjuster on the left (14).
5	Turn engine at crankshaft center bolt in direction of engine rotation to a 40° crank angle after ignition TDC and check position of camshafts		AR05.20-P-6010-01VB
6	Lock gear backlash compensation for respective camshaft adjuster (13 or 14)		AR05.20-P-7201-05VA
7	Detach center valve (5 or 6) for respective camshaft adjuster (13 or 14)	Observe loosening direction.	AR05.20-P-7201-06VA
			*BA05.20-P-1009-02A
			Fig 4
8	Remove center valve (5 or 6) for respective camshaft adjuster (13 or 14) and remove pulse wheel (9 or 10)	Check dowel pin (18) and pin (19). If a dowel pin (18) or pin (19) is sheared off then this must be removed from respective camshaft adjuster (13 or 14). Installation: Always replace pulse wheel (9 or 10). When tightening the center valve (5 or 6) there is a risk that dowel pin (18) or pin (19) may shear at the pulse wheel (9 or 10). Lubricate the center valve (5 or 6) at the contact surface with the pulse wheel (9 or 10) before assembling. Installation: Align dowel pin (18) for pulse wheel (9 or 10) with the fitted bore (20) in the camshaft adjuster (13 or 14).
9	Counterhold the respective exhaust camshaft (2) at the rear and pull off the camshaft adjuster (13 or 14) from the exhaust camshaft (2) towards the front	Installation: Lubricate contact surfaces on exhaust camshaft (2) and camshaft adjuster (13 or 14) before assembling camshaft adjuster (13 or 14). Installation: Align dowel pin (21) in camshaft adjuster (13 or 14) to fitted bore (22) in exhaust camshaft (2) and install camshaft adjuster (13 or 14) in its basic position:	Fig 4
		See "CHECK BASIC POSITION OF CAMSHAFTS ".	AR05.20-P-6010-01VB
10	Install in the reverse order
	Checking
	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
11	Conduct engine test run and check engine for leaks

CAMSHAFT, CAMSHAFT ADJUSTMENT

Number	Designation		Engine 272	Engine 273
BA05.20-P-1009-02A	Center valve for pulse wheel/camshaft adjuster to camshaft	Nm	145	145

Fig 4: Identifying Torx Screwdriver Bit T60 (272 589 00 10 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.