Remove/install valves - AR05.30-P-3511MM

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ENGINE 152.9 in MODEL 172

ENGINE 157 in MODEL 212, 218

ENGINE 278 in MODEL 207, 212, 218

Exemplified

Fig 1: Valves Remove/Install Components - Exemplified

Courtesy of MERCEDES-BENZ USA

Shown on engine 152

Fig 2: Valves Remove/Install Components - Shown On Engine 152

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Shown on engine 276

Fig 3: Valves Remove/Install Components - Shown On Engine 276

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove cylinder head (1)	ENGINE 152.9 in MODEL 172.4 Cylinder head (1) on the right	AR01.30-P-5780MMI
		ENGINE 157, 278 in MODEL 212, 218 ENGINE 278 in MODEL 207	AR01.30-P-5780ELB
		Cylinder head (1) on the left ENGINE 152.9 in MODEL 172.4	AR01.30-P-5770MMI
		ENGINE 157, 278 in MODEL 212, 218 ENGINE 278 in MODEL 207	AR01.30-P-5770ELB
2	Remove valve clearance compensation element	ENGINE 278 in MODEL 207	AR05.00-P-2011FH
		ENGINE 157, 278 in MODEL 212, 218	AR05.00-P-2011EL
		ENGINE 152.9 in MODEL 172.4	AR05.00-P-2011MMI
3	Mount cylinder head (1) onto assembly device (01)	Before putting assembly device (01) into operation, check that counterholders (02) are correctly mounted on cylinder head (1). There is otherwise the danger that the cylinder head (1) will be pressed upwards out of the assembly device (01) and the cylinder head (1) will be damaged with the valves (6) in the combustion chamber. Observe operator's manual of assembly device manufacturer (01).
		Assembly tool	Figure
4	Mount assembly lever (03) with depressor (04) on sliding piece (05)	Position depressor (04) vertically at upper valve spring retainer (2) and align to sliding piece (05).
		Depressor	Figure
		Valve assembly tools kit	Figure
5	Slide air bellows for assembly device (01) with the lever (06)	Ensure that air bellows for assembly device (01) always correctly stands opposite a combustion chamber and is pushed in the middle. The air bellows can be pushed out of the side of the combustion chamber otherwise and this leads to damage to the valves (6). Move air bellows for the assembly device (01) with a lever (06) in such a way that they are matched to the combustion chamber of the respective valves (6).
6	Connect compressed air hose to assembly device (01) and open compressed air valve	The assembly device (01) air bellows presses the valve disks in the combustion chamber.
7	Remove upper valve spring retainer (2) and valve spring (3)	Press together valve spring (3) and Remove valve keepers (4). Before installing the upper valve spring retainers (2) and valve springs (3), replace the valve stem seals (5).
		Magnetic pin Before mounting the upper valve spring retainers (2) and valve springs (3): ↓ Replace valve stem seals (5).	Figure
		Replace valve stem seals	AR05.30-P-3500-02MM
8	Close compressed air valve for assembly device (01)	Then disconnect compressed air hose from assembly device (01).
9	Remove valves (6)	For this purpose, detach the cylinder head (1) from the assembly device (01).
	Check
10	Check upper valve spring retainer (2) and lower valve spring retainer (7)	Check upper valve spring retainers (2) and lower valve spring retainers (7) for score marks, cracks and pitting; replace if necessary.
11	Check valve stems	Check surface of valve stems for roughness and ridging (visual inspection or with nail). Replace valves (6) with a rough stem surface or ridging.
12	Install in the reverse order

Fig 4: Identifying Magnetic Pin (210 589 00 40 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Depressor (273 589 00 61 00)

Courtesy of MERCEDES-BENZ USA

Fig 6: Identifying Valve Assembly Tools Kit (111 589 25 61 00)

Courtesy of MERCEDES-BENZ USA

Fig 7: Identifying Assembly Tool (271 589 00 59 00)

Courtesy of MERCEDES-BENZ USA