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

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ENGINES 272, 273 in MODEL 212

Fig 1: Valve Springs Remove/Install Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Valve Springs Remove/Install Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove air filter housing		AR09.10-P-1150EWS
2	Remove cylinder head covers	Right cylinder head cover except model 212.057	AR01.20-P-5012EL
		Right cylinder head cover model 212.057	AR01.20-P-5012ELD
		Left cylinder head cover except model 212.057	AR01.20-P-5013EL
		Left cylinder head cover model 212.057	AR01.20-P-5013ELD
3	Remove camshafts		AR05.20-P-6992EW
4	Remove hydraulic valve clearance compensation elements		AR05.00-P-2011EW
5	Remove spark plugs
	Replace spark plugs		AP15.10-P-1580EW
6	Crank engine at crankshaft in direction of rotation until piston on cylinder to be machined is positioned at TDC	Crank crankshaft at center bolt for the belt pulley, at the same time hold up the timing chain, so that it does not jam when cranking. Before installing camshafts turn engine again at crankshaft in direction of engine rotation in starting position to a 40° crank angle after ignition TDC.
			Figure
7	Connect cylinder leakage testing unit		AR01.00-P-1300-01VA
			Figure
8	Pressurize compression chamber to about 5 bar	If the crankshaft turns, the retaining lock for crankshaft/starter ring gear must be installed: ↓
		Install retaining lock for crankshaft/starter ring gear.	AR03.30-P-5000EWS
9	Mount counterholder (01) on cylinder head		Figure
10	Mount assembly lever (02) with depressor (03) on counterholder (01) and align	Place depressor (03) on upper valve spring retainer (1) vertically.
			Figure
			Fig 4
11	Remove upper valve spring retainer (1) and valve spring (2)	When pressing together the valve spring (2) ensure that the depressor (03) does not slip otherwise the surface of the valve stem can be damaged. Do not allow valves to touch piston crowns otherwise they will be damaged. Compress valve spring (2). Remove split valve spring retainer locks (3) with magnetic finger (04), magnet pit or tweezers.
			Figure
			Fig 6
12	Take out lower valve spring retainer (4).
13	Replace valve stem seal (5)	Check surface of valve stem for roughness and formation of ridging (visual inspection or with nail). Replace valves with a rough stem surface or formation of ridging: ↓	AR05.30-P-3500-02VA
		Remove/install valves.	AR05.30-P-3511SX
			Figure
			Figure
	Checking
14	Check valve spring retainer (1, 4) for pitting; replace as required
15	Perform machining of other cylinders in the same way	If a retaining lock for crankshaft/starter ring gear was installed, it must be removed before turning engine.
16	Install in the reverse order
17	Check engine oil level using engine oil dipstick approx. 5 minutes after switching off engine which is at operating temperature, correct if necessary	The vehicle must be on a level surface otherwise false measurements will occur.
	Engine oil and filter change		AP18.00-P-0101EW
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
18	Carry out an engine test run and check engine for leaks
19	Inspecting cooling system for leaks		AR20.00-P-1010EW