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

ENGINE 156 in MODEL 216, 221

Fig 1: Identifying Chain Tensioner Remove/Install Components

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

4.9.08

Replace sealing ring by replacing chain tensioner - replaced

Operation step 7

	Remove/install
	Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, liftgates or sliding roof	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Risk of explosion caused by oxyhydrogen gas. Risk of poisoning and caustic burns caused by swallowing battery acid. Risk of injury caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
1	Detach ground line from battery	Insulate clamping device of the ground line in order to prevent inadvertent contact with the ground point of the battery.	AR54.10-P-0003SX
	Notes on battery	All models	AH54.10-P-0001-01A
2	Open engine hood and raise to vertical position
3	Remove left and right intake air duct
4	Remove front engine cover	Do not tilt front engine cover, but lift upwards vertically otherwise the retaining lugs can break off.
5	Partially remove poly-V belt (3)	The poly-V belt (3) must be removed from the alternator belt pulley (G2).	AR13.22-P-1202SMG
6	Loosen alternator (G2) and lay down to side with connected lines		AR15.40-P-5032SMG
			*BA15.40-P-1001-01P
		External torx set	Fig 2
7	Remove chain tensioner (1) from timing case cover	Replace chain tensioner (1).
7	Remove chain tensioner (1) from timing case cover		*BA05.10-P-1008-01B
8	Install in the reverse order
9	Perform basic programming
	Checking
	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
10	Check for leaks with engine running

ALTERNATOR

Number	Designation			Engine 156
BA15.40-P-1001-01P	Bolt, alternator to timing case	M8 X 90	Nm	20

TIMING CHAIN, CHAIN TENSIONER

Number	Designation			Engine 156
BA05.10-P-1008-01B	Chain tensioner to timing case	M22 X 1.5	Nm	75

Fig 2: Identifying External Torx Set (001 589 76 09 00)

Courtesy of MERCEDES-BENZ USA