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

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ENGINES 651 in MODELS 166, 172, 204, 207, 212, 218, 221

Shown on engine 611.960

Fig 1: Valve Springs Remove/Install Components - Shown On Engine 611.960 (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Valve Springs Remove/Install Components - Shown On Engine 611.960 (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove camshafts		AR05.20-P-6992CD
2.1	Rotate engine at crankshaft using a counterholder in direction of engine rotation and place piston for cylinder at Top Dead Center (TDC)	Except code (B03) ECO start-stop function Hold timing chain up. This prevents the timing chain from getting jammed during turning of the crankshaft. Do not rotate engine backwards. Engine damage can occur otherwise.
		Counterholder	Figure
2.2	Rotate engine at crankshaft using a suitable tool in direction of engine rotation and place piston for cylinder at Top Dead Center (TDC)	With code (B03) ECO start/stop function Hold timing chain up. This prevents the timing chain from getting jammed during turning of the crankshaft. Do not rotate engine backwards. Engine damage can occur otherwise.
3	Install retaining lock (3) for crankshaft or ring gear		AR03.30-P-5000CD
4	Seal injector hole with connector (21)	Attachment of connector (21) takes place by means of an original clamping claw of the engine 642 for which the bore hole was drilled out to a dia. of 7.5 mm.
		Connection piece	Fig 7
5	Attach cylinder leakage tester (13) to connector (21)	Pressurize compression chamber of cylinder to be inspected to about 5 bar. Cylinder leakage tester (pressure loss)
6	Put together valve assembly tool (1) and install on the cylinder head	Use parts 3, 5, 7, 12 and 19 from valve assembly tool case. Screw retaining fork M6 X15 mm (part 12) into thread on the cylinder head edge and place thrust piece vertically to the detent depressor (part 7) on the upper valve spring retainer (14).
		Valve assembly tool case	Figure
7	Use valve assembly tool (1) to compress the valve springs (15)
8	Remove valve keepers (16)	Use tweezers or magnetic finger. Ensure valve keepers (16) are properly fitted. This avoids loosening of the valves.
		Magnetic finger	Figure
9	Remove upper valve spring retainer (14) and valve springs (15)	Valves must not rest on the piston crown. Check upper valve spring retainer (14) for pitting and replace if necessary.
10	Use pliers (20) to remove valve stem seals (18)	Use new valve stem seals (18). Oil valve stem seals (18) and press with drift (19) onto the valves
		Pliers	Figure
		Drift	Figure
	Checking
11	Check shaft surface of valves for roughness and ridging	Visual inspection or test using a nail probe. Replace valves that have rough stem surfaces or burrs. See: ↓
		Remove/install valves	AR05.30-P-3511CD
12	Install in the reverse order