Remove/Install Poly-V-Belt Tensioning Device - AR13.25-P-3220SVZ

Engine 279 in model 223 

Fig 1: Poly-V-Belt Tensioning Device Components Location - Engine 279 In Model 223

Courtesy of MERCEDES-BENZ USA

Shown on removed engine 

	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  . Moving parts can pinch, crush or, in extreme cases even sever extremities.	No parts of the body or limbs should be within the operating area of mechanical components when moving components.	AS00.00-Z-0009-01A
	Remove/install
1	Release tension from poly-V belt and remove.		AR13.22-P-1202SVZ
2	Unscrew screws (2) and remove tensioning device (1).	Tensioning device (1) is pretensioned by a pin. : Tensioning device (1) can only be installed in pretensioned status. Bolt, tensioning device to timing case cover	*BA13.25-P-1001-01ZA
	Check
3	Check tensioner pulley and tensioning device (1) for damage and wear.	If damage or wear is present, ↓ Replace clamping device (1). : Clamp old tensioning device (1) in a vise, turn counterclockwise at hexagon (1.1), remove pin and relieve tensioning device (1) of tension. Clamp new tensioning device (1) in a vise, turn counterclockwise at hexagon (1.1) and slide in pin and relieve tensioning device (1) of tension.
4	Install in the reverse order.

BELT TENSIONING DEVICE

Number	Designation		Engine 279
BA13.25-P-1001-01ZA	Bolt, tensioning device to timing case cover	Nm	14