Remove/Install Valve Springs - AR05.30-P-3021MFG

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Engine 139 in model 118, 177, 247

Courtesy of MERCEDES-BENZ USA

Example illustration

Courtesy of MERCEDES-BENZ USA

	Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil	Wear protective gloves, protective clothing and safety glasses. Do not fill engine oil into beverage containers.	AS18.00-Z-0001-01A
	Risk of injury caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
	General information on checking valves, valve seats and valve guides		AH05.30-P-1000-02SZ
	Remove/install
1	Remove cylinder head (1).		AR01.30-P-5800MFG
2	Remove valve clearance compensating elements.		AR05.00-P-2011MFG
3	Attach cylinder head (1) to assembly device (01).	Before commissioning ensure that the counterholder (02) for the assembly device (01) is mounted correctly on the cylinder head (1). There is otherwise the danger that the cylinder head (1) is pressed upwards out of the assembly device (01) and that the combustion chamber (6) is damaged by the valves. Follow the operating instructions for the assembly device manufacturer (01). Assembly tool	Fig 1
4	Attach assembly lever (03) with depressor (04) from sliding piece (05).	Position the depressor (04) vertically at upper valve spring retainer (2) and align to sliding piece (05). Depressor	Fig 6
		Valve assembly tools kit	Fig 3
5	Slide the air suspension bellows for the assembly device (01) with the lever (06).	Ensure that the air suspension bellows for assembly device (01) always correctly stands opposite a combustion chamber and is pushed in the middle. The valves (6) will otherwise be damaged.
6	Connect compressed-air hose to the assembly device (01) and open compressed air valve.	The assembly device (01) air suspension bellows press on the valve disks in the combustion chamber. Follow the operating instructions for the assembly device manufacturer (01).
7	Compress valve spring (3) with assembly lever (03).
8	Remove valve keepers (4).	Ensure that the valve keepers (4) are reliably seated. Magnetic pin	Fig 2
9	Remove upper valve spring retainer (2), lower valve spring retainer (7) and valve spring (3).	Do not replace one valve spring (3) individually. If one valve spring is defective (3) replace all valve springs (3).
10	Use pliers (07) to remove valve stem seal (5).	Oil valve stem seals (5) and press on with a drift (08). Install valve stem seals (5) with a brown seal on the exhaust side and those with a green seal on the intake side.	AR05.30-P-3501MFG
		Pliers	Fig 4
		Drift	Fig 5
	Check
11	Check valve stems for formation of burrs and pitting.	If ridging is detected on the valve stems, ↓ Deburr valve stems. If the valve stems show signs of pitting, ↓ Replace valves (6).
12	Check top valve spring retainers (2) and bottom valve spring retainers (7) for score marks, cracks, and pitting.	If there are problems, ↓ Replace upper valve spring retainers (2) and lower valve spring retainers (7).
13	Install in the reverse order.
	Check
	Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
14	Perform engine test run. While doing so, check engine for proper operation and leak tightness.