Replace timing chain - AR05.10-P-7601EW

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ENGINES 272, 273 in MODEL 212

Fig 1: Timing Chain Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Timing Chain Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Removing
1	Disconnect battery ground cable		AR54.10-P-0003EW
	Notes on battery		AH54.10-P-0001-01A
2	Remove spark plugs
	Replace spark plugs		AP15.10-P-1580EW
3	Remove exhaust and intake camshafts (1, 2) at right cylinder head		AR05.20-P-6992EW
4	Disconnect old timing chain (3)		AR05.10-P-7601-01VA
			Figure
			Figure
			Figure
			Figure
	Install
5	Draw in new timing chain (4)		AR05.10-P-7601-04VA
			Figure
			Figure
6	Rivet new timing chain (4)		AR05.10-P-7601-02VA
			Figure
			Fig 8
			Fig 9
			Fig 10
			Fig 11
			*BA05.10-P-1007-01B
7	Crank engine at crankshaft in direction of rotation of engine to a 55° crank angle before ignition TDC on first cylinder (305° marking on belt pulley) See "Check basic position of camshafts with front cover installed at cylinder head at a 55° crankshaft angle before ignition TDC" .		AR05.20-P-6010EW
		The markings (5) on pulse wheels of intake and exhaust camshaft (1, 2) on the left cylinder head must be located centrally in bores for camshaft Hall sensors. If this is not the case, turn engine at crankshaft in direction of engine rotation through one revolution.	Fig 12
8	Crank engine at crankshaft in its direction of rotation through a 95° crank angle to a 40° crank angle after ignition TDC on first cylinder
9	Install intake camshaft (1) and exhaust camshaft (2) on right cylinder head in the basic position	Markings (6) point upwards and markings (7) align with contact surfaces on the cylinder head covers.	AR05.20-P-6992EW
		See "Check basic position of camshafts with front cover removed at the cylinder head at 40° crankshaft angle after ignition TDC ".	AR05.20-P-6010-01VB
10	Crank engine at crankshaft in the direction of rotation of the engine and check that the basic position of the camshafts for an installed front cover on the cylinder head is at a 55° crank angle before ignition TDC (305° marking on the belt pulley)	The markings (5) on pulse wheels of intake and exhaust camshafts (1, 2) must be located centrally in bores for camshaft Hall sensors.	AR05.20-P-6010EW
11	Install spark plugs
	Replace spark plugs		AP15.10-P-1580EW
12	Connect ground cable to battery		AR54.10-P-0003EW
	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
13	Carry out an engine test run and check engine for leaks