Check hydraulic valve clearance compensating elements - AR05.00-P-2010CD

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

Fig 1: Checking Hydraulic Valve Clearance Compensating Elements

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Check engine oil level, correct if necessary	The engine oil level must lie between "Min" and "Max". Engine damage can occur otherwise.
	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
2	Start engine and bring to operating temperature	Coolant temperature 60 to 80°C.
3	Remove cylinder head cover		AR01.20-P-5014CD
	Checking
4.1	Rotate engine at crankshaft using a counterholder in direction of engine rotation until the cam (3) on the compensation element (2) to be tested is on its base circle	Except code (B03) ECO start-stop function The engine must not be turned back. The timing chain can skip and cause engine damage otherwise.
		Counterholder	Fig 2
4.2	Rotate engine at crankshaft using a suitable tool in direction of engine rotation until the cam (3) on the compensation element (2) to be tested is on its base circle	With code (B03) ECO start/stop function The engine must not be turned back. The timing chain can skip and cause engine damage otherwise.
5	Press down compensation element (2) over cam follower (4) by hand using the appropriate tool (5)	Do not use a steel tool. Press compensation element (2) downwards using normal force of the hand. If a number of compensation elements (2) drop, check oil ducts and oil feed bores for the compensation elements (2) for fouling; blow out oil ducts with compressed air in the direction of flow of the oil if necessary. If a compensation element (2) drops much more than other compensation elements (2), replace the compensation element (2) in question See: ↓
		Remove/install compensation element (2).	AR05.00-P-2011CD
6	Install in the reverse order

Fig 2: Identifying Counterholder (651 589 00 40 00)

Courtesy of MERCEDES-BENZ USA