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Remove/install camshaft adjusters, intake - AR05.20-P-7201GZC (ML350, ML550, GL450, GL550)

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ENGINES 272, 273 in MODEL 164, 251 

Camshaft adjuster for intake camshafts 

Fig 1: Identifying Camshaft Adjuster And Intake Camshafts Components Location
G05257432Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 2: Identifying Camshaft Adjuster, Pin And Dowel Pin
G05257433Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Identifying Camshaft And Dowel Pin
G05257434Courtesy 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 
REMOVINGINSTALLING Remove/install    
1 Turn key in ignition lock to position "0" IMPORTANT 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 chain tensioner Chain tensioner using thread M24 x 1.5 (only for engine 272) AR05.10-P-7800GZA 
    IMPORTANT Chain tensioner using thread M22 x 1.5 In case of engine 272, both chain tensioners can be removed whereby for engine 273 only chain tensioner with thread M22 1.5 is installed. AR05.10-P-7800GZG 
  Right-hand side     
4 Remove camshaft adjuster for right exhaust camshaft (1)   AR05.20-P-7201GZA 
5 Remove cap (26)    
6 Detach center valve (7) NOTESInstallation:  The center valve (7) may only be tightened when chain tensioner is removed, otherwise this can lead to malfunctioning of camshaft adjustment.  
    IMPORTANT Observe loosening direction. AR05.20-P-7201-06VA 
    TORQUE SPECIFICATION *BA05.20-P-1009-02A 
    SPECIAL TOOL Fig 4
7 Remove the right cylinder head cover   AR01.20-P-5012GZA
8 Mark timing chain relative to the camshaft adjuster (15) using color codes (25) IMPORTANT Engine positioned at 40° crankshaft angle after ignition TDC.
IMPORTANTInstallation:  Check position of intake camshaft (3) based on color coding (25).		  
9 Remove tensioning rail (24)   AR05.10-P-8127GZA 
10 Remove center valve (7) and pulse wheel (11) INSPECT Check dowel pin (18) and pin (19). If a dowel pin (18) or pin (19) is sheared off then this must be removed from camshaft adjuster (15).
NOTESInstallation:  Always replace pulse wheel (11). When tightening center valve (7) there is a risk that dowel pin (18) or pin (19) may shear off at pulse wheel (11).
IMPORTANTInstallation:  Lubricate center valve (7) at the contact surface with the pulse wheel (11) before assembly.
IMPORTANTInstallation:  Align dowel pin (18) for pulse wheel (11) with fitted bore (20) in camshaft adjuster (15).		  
11 Remove timing chain from camshaft adjuster (15) and detach camshaft adjuster (15) forwards from intake camshaft (3) IMPORTANTInstallation:  Lubricate contact surfaces to intake camshaft (3) and camshaft adjuster (15) before mounting camshaft adjuster (15).
IMPORTANTInstallation:  Align color coding (25) on camshaft adjuster (15) and timing chain with each other. Align the dowel pin (21) in the camshaft adjuster (15) with fitted bore (22) in intake camshaft (3).		  
  Left-hand side     
12 Remove camshaft adjuster for the left exhaust camshaft (2)   AR05.20-P-7201GZA 
13 Remove cap (27)    
14 Detach center valve (8) NOTESInstallation:  The center valve (8) may only be tightened when chain tensioner is removed, otherwise this can lead to malfunctioning of camshaft adjustment.  
    IMPORTANT Observe loosening direction. AR05.20-P-7201-06VA 
    TORQUE SPECIFICATION *BA05.20-P-1009-02A 
    SPECIAL TOOL Fig 4
15 Remove left cylinder head cover   AR01.20-P-5013GZA
16 Mark timing chain relative to the camshaft adjuster (16) using color codes (25) IMPORTANT Engine positioned at 40° crankshaft angle after ignition TDC.
IMPORTANTInstallation:  Check position of intake camshaft (4) based on color coding (25).		  
17 Remove center valve (8) and pulse wheel (12) INSPECT Check dowel pin (18) and pin (19). If a dowel pin (18) or pin (19) is sheared off then this must be removed from camshaft adjuster (16).
NOTESInstallation:  Always replace pulse wheel (12). When tightening center valve (8) there is a risk that dowel pin (18) or pin (19) may shear off at pulse wheel (12).
IMPORTANTInstallation:  Lubricate center valve (8) at the contact surface with the pulse wheel (12) before assembly.
IMPORTANTInstallation:  Align dowel pin (18) for pulse wheel (12) with fitted bore (20) in camshaft adjuster (16).		  
18 Remove timing chain from camshaft adjuster (16) and detach camshaft adjuster (16) towards the front from intake camshaft (4) IMPORTANTInstallation:  Lubricate contact surfaces to intake camshaft (4) and camshaft adjuster (16) before the mounting camshaft adjuster (16).
IMPORTANTInstallation:  Align color coding (25) on camshaft adjuster (16) and timing chain with each other. Align the dowel pin (21) in the camshaft adjuster (16) with fitted bore (22) in intake camshaft (4).		  
19 Install in the reverse order    
INSPECT Checking     
DANGER 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 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)
G05257435Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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