Check Hydraulic Valve Clearance Compensating Elements - AR05.00-P-2010MRA

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Engine 274.9 in model 205

Engine 274.9 in model 253

Courtesy of MERCEDES-BENZ USA

	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 buttoned-up and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
	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 . Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Remove/install
1	Check and correct oil level		AP18.00-P-1811MP
2	Warm up engine to normal operating temperature
3	Switch off ignition and store transmitter key outside of transmission range (min. 2 m)
4	Remove cylinder head cover	: Only install upper engine cover after the leak test.	AR01.20-P-5014MRA
5	Turn engine at center bolt on crankshaft until the cams of the camshaft on the valve clearance compensating element to be checked point upwards	Do not turn engine against direction of engine rotation. Otherwise engine damage can occur. Socket wrench bit If the roller-type cam follower (1) does not touch the cam. ↓	Fig 1
		Replace valve clearance compensating element.	AR05.00-P-2011MRA
	Check
6	Compress valve clearance compensating element; to do this depress the roller-type cam follower (1) using a suitable drift (01)	Do not use a steel tool. The surface will be damaged otherwise. The valve clearance compensating element should not be pressed together with the normal force of the hand but only very slowly when applying a strong pressure. If the valve clearance compensating element drops too strongly. ↓
		Replace valve clearance compensating element. If a number of valve clearance compensating elements are defective. ↓	AR05.00-P-2011MRA
		Check compress oil supply of cylinder head.	AR18.00-P-1250MRA
7	Install in the reverse order
8	Perform an engine test run and check engine for proper operation and leaktightness
9	Install upper engine cover

Fig 1: Identifying Socket Wrench Bit (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA