Remove/install valve springs and/or valve stem seals - AR05.30-P-3500AMG

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ENGINES 156

Fig 1: Valve Stem Seals Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
1	Remove cylinder head covers	Model 164, 251	AR01.20-P-5014GZS
		Model 204, 212	AR01.20-P-5014CMG
		Model 209, 211, 219	AR01.20-P-5014TMG
		Model 216, 221	AR01.20-P-5014SMG
		Model 230	AR01.20-P-5014RMG
2	Remove camshafts	Up to engine number 001177	AR05.20-P-6992ANG
		from engine number 001178	AR05.20-P-6992AMG
3	Remove hydraulic valve clearance compensation elements (2)		AR05.00-P-2011AMG
4	Rotate piston of the cylinder to be worked on to TDC	Before installing the camshaft sprockets, turn the crankshaft back into the starting position to 40° after ignition TDC at cylinder 1.
5	Connect cylinder leakage tester (1)	Screw connection hose for cylinder leakage testing unit (1) into relevant spark plug bore.	AR01.00-P-1300-01VA
			Fig 4
6	Pressurize the compression chamber	The pressure should be around 5 bar.
7	Screw retaining fork and detent with hinged bearing into cylinder head		Fig 2
8	Attach detent depresser with lever handle and thrust piece into detent with hinged bearing, align	Position thrust piece vertically at upper valve spring retainer (3) and align parallel to grid with joint bearing.
			Fig 2
9	Depress valve spring (4) and remove split valve spring retainer locks (5)	Remove valve keepers (5) using tweezers or magnetic finger.
			Fig 3
10	Remove upper valve spring retainer (3) and valve spring (4)	Do not allow valves to come into contact with piston crowns, otherwise they will be bent. The valve springs of the intake and exhaust valves are identical.
11	Remove valve stem seal (6)	Replace valve stem seal (6) after inspecting lower valve spring retainer (7).	AR05.30-P-3500-02VA
			Figure
			Figure
12	Remove lower valve spring retainer (7)
	Checking
13	Inspect surface of valve stems for roughness and ridging	Visual inspection or with nail probe. Replace valves with a rough stem surface or formation of ridging: ↓
		Remove valves.	AR05.30-P-3511AMG
14	Check upper and lower valve spring retainers (3, 7)	Inspect the valve spring retainer for burrs, replace if necessary.
15	Install in the reverse order