Remove/install valve springs and/or valve stem seals - AR05.30-P-3500AMG (ML63 AMG): Notes

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2012 Mercedes-Benz GL550, 2012 Mercedes-Benz GL450, 2011 Mercedes-Benz ML63, 2011 Mercedes-Benz ML550, and 2011 Mercedes-Benz ML350. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 156

Fig 1: Identifying Valve Springs And Valve Stem Seals Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	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
		Models 209, 211, 219	AR01.20-P-5014TMG
		Model 216, 221	AR01.20-P-5014SMG
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	Installation: 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.
		Thread adapter Cylinder leakage testing unit	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	Valve assembly tools case	Fig 2
8	Attach detent depressor with lever handle and thrust piece into detent with hinged bearing, align	Position the thrust piece vertically at the upper valve spring retainer (3) and align parallel to the grid with the joint bearing.
		Valve assembly tools case	Fig 2
9	Depress valve spring (4) and remove split valve spring retainer locks (5)	Remove split valve spring retainer locks (5) using tweezers or a magnetic finger
		Magnetic finger Tweezers	Fig 3
10	Remove upper valve spring retainer (3) and valve spring (4)	Do not allow the valves to come into contact with the piston crowns, otherwise they will be bent. The valve springs of the intake and exhaust valves are identical.
11	Remove valve stem seal (6)	Installation: Replace valve stem seal (6) after inspecting the lower valve spring retainer (7).	AR05.30-P-3500-02VA
		Pliers	Fig 5
		Drift	Fig 6
12	Remove lower valve spring retainer (7)
	Checking
13	Inspect surface of valve stems for roughness and ridging	Visual inspection or with nail. Replace valves with a rough stem surface or formation of ridging: ↓
		Remove valves	AR05.30-P-3511AMG
14	Inspect upper and lower valve spring retainer	Inspect the valve spring retainer for burrs, replace if necessary.
15	Install in the reverse order