Remove/install poly-V belt tensioning device - AR13.25-P-3200SMG

ENGINE 156 in MODEL 216, 221 

Fig 1: Identifying Poly-V Belt Tensioning Device Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  caused by fingers being pinched or crushed  when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
1	Open engine hood and raise to vertical position
2	Remove the left and right intake air duct
3	Remove front engine cover	Do not tilt front engine cover, but lift upwards vertically otherwise the 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-1202SMG
5	Rotate tensioning device at hexagon (3) in an anti-clockwise direction and lock	Lock tensioning device using a pin or a 5 mm Ø drift.
6	Remove bolts (1)		*BA13.25-P-1001-01U
7	Remove tensioning device (3)	Only model 221: Move clamping device and take out upwards on the right side (in direction of travel).
8	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 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
9	Carry out engine test run

BELT TENSIONING DEVICE

Number	Designation			Engine 156, 159
BA13.25-P-1001-01U	Bolt, poly-V belt tensioning device to timing case cover	M8	Nm	20