Removing/installing valves - AR05.30-P-3511GZ (ML500)

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ENGINE 113.964 in MODEL 164.175

Fig 1: Identifying Valves Components (1 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Valves Components (2 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing/installing
	General information	Observe owner's manual of assembly device manufacturer (01).
		Assembly device	Fig 3
1	Remove cylinder head (1)		AR01.30-P-5800GZ
2	Mount cylinder head (1) onto assembly device (01)	Before startup of assembly device (01) check that the counterholders (02) are correctly mounted at cylinder head (1). There is a risk that the cylinder head (1) is pressed upwards out of the assembly device (01) since the air bellows of the assembly device (01) in the combustion chamber of the cylinder head (1) press on the valve disk.
		Assembly device	Fig 3
		Valve assembly tools case	Fig 4
3	Mount assembly lever (03) with thrust piece (04) onto sliding piece (05)	Position thrust piece (04) vertically at upper valve spring plate (2) and align to sliding piece (05).
		Valve assembly tools case	Fig 4
4	Move the air bellows of the assembly device (01) with a lever (06) in such a way that they are matched with the combustion chamber of the respective valves	Ensure, that the air bellows of the assembly device (01) are correctly matched with a combustion chamber and pressed in centrally, otherwise the air bellows can press laterally out of the combustion chamber.
		Assembly device	Fig 3
		Valve assembly tools case	Fig 4
5	Connect compressed air line to assembly device (01) and open compressed air valve	Press the air bellows of the assembly device (01) in the combustion chamber onto the valve disks.
		Assembly device	Fig 3
6	Remove upper valve spring plate (2) and valve spring (3)	Press together the valve spring (3) and remove split valve spring retainer locks (4) using a magnetic rod (07).
		Magnetic finger	Fig 5
		Installation: Replace valve stem seals before mounting the upper valve spring plates and valve springs: ↓ Replace valve stem seals	AR05.30-P-3500-02A
		Pliers	Fig 6
		Drift	Fig 7
7	Take out lower valve spring plate (5).
8	Close compressed air valve and seal compressed air line from assembly device (01).	Assembly device	Fig 3
9	Remove cylinder head (1) from assembly device (01) and take out valve (6)	Assembly device	Fig 3
	Checking
10	Check the upper valve spring plate (2) and the lower valve spring plate (5)	Inspect valve spring retainer for formation of burrs, replace if necessary.
11	Inspect surface of valve stem for roughness and ridging	Visual inspection or with nail. Valves with a rough stem surface or burring must be replaced.
12	Install in reverse order