Remove/install poly-V belt tensioning device - AR13.25-P-3200GZS (ML63 AMG)

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ENGINE 156 in MODEL 164, 251

Fig 1: Identifying Poly-V-Belt Tensioning Device Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
	Risk of injury caused by fingers being jammed or pinched when removing/installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.	When moving components, ensure that no body parts or limbs are within operating range of moving parts.	AS00.00-Z-0011-01A
1	Open engine hood and raise to vertical position	Model 164	AR88.40-P-1000GZ
		Model 251	AR88.40-P-1000RT
2	Remove the left and right intake air duct
3	Remove front engine cover	Do not tilt engine cover, but lift upwards vertically otherwise retaining lugs can break off.
4	Partially remove poly-V-belt (2)	Only remove poly-V-belt (2) from belt pulley/guide pulleys until tensioning device (3) is accessible.	AR13.22-P-1202GZ
5	Rotate tensioning device at hexagon (3) in an anti-clockwise direction and lock	Lock clamping device (3) with pin or drift (diameter 5 mm).
6	Remove bolts (1)		*BA13.25-P-1001-01U
7	Raise vehicle with lifting platform	Model 164	AR00.60-P-1000GZ
		Model 251	AR00.60-P-1000RT
8	Remove lower engine compartment paneling	Model 164	AR61.20-P-1105GZ
		Model 251	AR61.20-P-1105RT
9	Remove tensioning device (3)	Turn clamping device (3) in such a way that guide pulley for clamping device (3) points towards engine! Extend tensioner pulley in a gap in the fan downwards.
10	Install in the reverse order
	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 running engine	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not grasp hot or rotating parts.	AS00.00-Z-0005-01A
11	Carry out engine test run

BELT TENSIONING DEVICE

Number	Designation			Engine 156
BA13.25-P-1001-01U	Bolt, poly-V belt tensioning device to timing case cover	M8	Nm	20