Remove/install camshaft adjusters - AR05.20-P-7201EWE

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ENGINES 272, 273 in MODEL 212

On intake camshafts

Fig 1: Camshaft Adjusters Remove/Install Components - Intake Camshafts (1 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 2: Camshaft Adjusters Remove/Install Components - Intake Camshafts (2 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 3: Camshaft Adjusters Remove/Install Components - Intake Camshafts (3 Of 3)

Courtesy of MERCEDES-BENZ USA

	Remove/install
	The ground line on the battery must always be detached before beginning work on the fuel system otherwise pressure will be lost in the fuel system through opening a vehicle door or the trunk lid	Model 212.057
1	Remove air filter housing		AR09.10-P-1150EWS
2	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-7800EW
	Removal on right cylinder head
3	Remove camshaft adjuster for right exhaust camshaft (1)		AR05.20-P-7201EWA
4	Remove cap (26)
5	Detach center valve (7)	Observe loosening direction. The center valve (7) may only be tightened when chain tensioner is removed, otherwise this can lead to malfunctioning of camshaft adjustment.	AR05.20-P-7201-06VA
			*BA05.20-P-1009-02A
6	Remove right cylinder head cover	Except model 212.057	AR01.20-P-5012EL
		Model 212.057	AR01.20-P-5012ELD
7	Mark timing chain relative to the camshaft adjuster (15) using color codes (25)	Engine positioned at 40° crankshaft angle after ignition TDC. Check position of intake camshaft (3) based on color coding (25).
8	Remove tensioning rail (24)		AR05.10-P-8127EW
9	Remove center valve (7) and pulse wheel (11)	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). 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). Lubricate center valve (7) at contact surface with pulse wheel (11) before assembly. Align dowel pin (18) on pulse wheel (11) with bore (20) in camshaft adjuster (15).
10	Lift timing chain and pull off camshaft adjuster (15) from intake camshaft (3) towards the front	Lubricate contact surfaces to intake camshaft (3) and camshaft adjuster (15) before mounting camshaft adjuster (15). Align color coding (25) on camshaft adjuster (15) and timing chain with each other. Align dowel pin (21) in camshaft adjuster (15) with fitted bore (22) in intake camshaft (3).
	Removal on left cylinder head
11	Remove camshaft adjuster for exhaust camshaft (2)		AR05.20-P-7201EWA
12	Remove cap (27)
13	Detach center valve (8)	Observe loosening direction. Tightening of center valve (8) may only take place for a removed chain tensioner. Malfunctions of camshaft adjustment can occur otherwise.	AR05.20-P-7201-06VA
			*BA05.20-P-1009-02A
14	Remove cylinder head cover	Except model 212.057	AR01.20-P-5013EL
		Model 212.057	AR01.20-P-5013ELD
15	Mark timing chain relative to camshaft adjuster (16) using color codes (25)	Engine positioned at 40° crankshaft angle after ignition TDC. Check position of intake camshaft (4) based on color coding (25).
16	Remove center valve (8) and pulse wheel (12)	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). 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). Lubricate center valve (8) at contact surface with pulse wheel (12) before assembly. Align dowel pin (18) for pulse wheel (12) with fitted bore (20) in camshaft adjuster (16).
17	Lift timing chain and detach camshaft adjuster (16) forwards from the intake camshaft (4)	Lubricate contact surfaces to intake camshaft (4) and camshaft adjuster (16) before the mounting camshaft adjuster (16). Align color coding (25) on camshaft adjuster (16) and timing chain with each other. Align dowel pin (21) in camshaft adjuster (16) with fitted bore (22) in intake camshaft (4).
18	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
19	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