Setting basic position of camshafts - AR05.20-P-6020GZ (ML500)

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ENGINE 113.964 in MODEL 164.175

Fig 1: Setting Basic Position Of Camshafts

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing
1	Remove cylinder head covers		AR01.20-P-5014GZ
2	Check basic position of camshafts	If basic position of the camshafts is incorrect: ↓ Turn engine to a 40° crank angle after ignition TDC at cylinder 1. The engine must not be turned backwards; otherwise the timing chain can get jammed.	AR05.10-P-6858GZ
3	Remove chain tensioner		AR05.10-P-7800GZ
4	Remove camshaft Hall sensor		AR15.10-P-2000GZ
5	Remove right-hand camshaft sprocket	Lift timing chain from camshaft sprocket.
		Open-end wrench	Fig 4
		Insertion tool	Fig 5
		Torque wrench	Fig 6
6	Remove left camshaft sprocket	Lift timing chain from camshaft sprocket.
		Open-end wrench	Fig 4
		Insertion tool	Fig 5
		Torque wrench	Fig 6
	Install
7	Rotate left camshaft to its basic position and fit locating plate to the camshaft	Groove of camshaft (6) must point to the center of the cylinder head cover separating surface in direction of inner V. Place locating plate (2) flush onto left cylinder head and insert into the slot of the camshaft (6). At a 40° crank angle after ignition TDC of cylinder 1, it is possible to rotate the camshaft without the valves coming into contact with the pistons.
		Locating plate	Fig 3
		Open-end wrench	Fig 4
8	Rotate right camshaft to basic position and insert locating plate (2) for right camshaft into camshaft	Groove of camshaft (6) must point to the center of the cylinder head cover separating surface in direction of inner V. Place locating plate (2) for the right camshaft flush on the right cylinder head and insert it into the keyway (6) of the camshaft. At a 40° crank angle after ignition TDC of cylinder 1, it is possible to rotate the camshaft without the valves coming into contact with the pistons.
		Locating plate	Fig 2
		Open-end wrench	Fig 4
9	Install left camshaft sprocket	Place timing chain onto camshaft sprocket.
			*BA05.20-P-1001-01B
		Insertion tool	Fig 5
10	Install right camshaft sprocket	Place timing chain onto camshaft sprocket.
			*BA05.20-P-1001-01B
		Insertion tool	Fig 5
11	Install camshaft Hall sensor		AR15.10-P-2000GZ
12	Install chain tensioner		AR05.10-P-7800GZ
	Checking
13	Inspect timing	The engine must not be turned backwards; otherwise the timing chain can get jammed.	AR05.10-P-6858GZ
	General notes on timing, markings		AH05.10-P-1000-01A
14	Install cylinder head covers		AR01.20-P-5014GZ