Remove/install chain tensioner - AR05.10-P-7800CD

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ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221

MODIFICATION NOTES

24.11.14

Chain tensioner in the cylinder head

BA05.10-P-1001-01Q

Fig 1: Chain Tensioner Remove/Install Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Chain Tensioner Remove/Install Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	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
	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
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove/install
1	Remove cover for air intake box on the right and remove air intake box on the right	Model 166
2	Remove right partition wall section	Model 166
3	Remove air filter housing		AR09.10-P-1150CD
4	Remove air filter housing holder (5)	To do this remove screw/bolts (6, 7) and place air filter housing holder (5) with electrical lines to one side.
5	Remove screws/bolts (1) and remove heat shield (2)	Bolt, shield to exhaust manifold	*BA14.10-P-1002-01P
6	Unfasten screw/bolt (8) and push heat shield holder (9) downwards	ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221 with CODE B03 (ECO start/stop function) To allow access to chain tensioner.
7	Remove chain tensioner (3)	Collect escaping engine oil with rags.	Chain tensioner in cylinder head
			*BA05.10-P-1001-01Q
8	Replace sealing ring (4) of chain tensioner (3)		AR05.10-P-7800-04OLD
9	Install in the reverse order
	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
10	Perform an engine test run and check engine for leaktightness

TIMING CHAIN, CHAIN TENSIONER

Number	Designation		ENGINE 651
BA05.10-P-1001-01Q	Chain tensioner in cylinder head	Nm	80

EXHAUST MANIFOLD

Number	Designation		ENGINE 651
BA14.10-P-1002-01P	Bolt, shield to exhaust manifold	Nm	8