Remove/Install Belt Drive Components - AR13.20-P-0001MLJ

Engine 157, 278 in model 166, 292

Shown on engine 278

Courtesy of MERCEDES-BENZ USA

	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.	No parts of the body or limbs should be within the operating area when the components are moving.	AS00.00-Z-0011-01A
	Remove/install
1	Slacken poly-V belt and remove		AR13.22-P-1202MLJ
2	Remove underfloor paneling	Engine 157, 278 in model 166, 292 Only perform when removing the clamping device (1).
			AR61.30-P-1001GQ
3	Swivel tensioning device (1) at hexagon (4) counterclockwise and lock in place using drift (8)	Only perform when removing the clamping device (1).
4	Remove screw/bolts for clamping device (1)	Only perform when removing the clamping device (1).
		Bolt, poly-V belt tensioning device to timing case cover	*BA13.25-P-1001-01Y
5	Remove clamping device (1) downwards	Only perform when removing the clamping device (1).
6	Clamp tensioning device (1) in a vise, swivel at hexagon (4) in an anti-clockwise direction, pull out drift (8) and slacken tensioning device (1)	Only perform when removing the clamping device (1).
		The clamping device (1) can be mounted in both a locked and an unlocked condition.
7	Remove left charge air pipe	Only perform when removing the guide pulleys (3).
			AR09.41-P-8620MLJ
		When removing the guide pulley (3) on the left engine side.
8	Remove screw/bolts for guide pulleys (3) and remove guide pulleys (3)	Only perform when removing the guide pulleys.
		Bolt, guide pulley to carrier	*BA13.25-P-1002-01Y
		Bolt, guide pulley to coolant pump/oil filter timing case cover	*BA13.25-P-1005-01Y
9	Remove screw/bolts for upper guide pulley (5)	Engine 157, 278 in model 166, 292 except code 468 (ACTIVE CURVE SYSTEM) Only perform when removing the guide pulleys (3).
		Bolt, guide pulley carrier/ABC pump to timing case cover/coolant pump	*BA13.25-P-1003-01Y
10	Detach upper guide pulley (5) and carrier from timing case cover	Engine 157, 278 in model 166, 292 except code 468 (ACTIVE CURVE SYSTEM) Only perform when removing the guide pulleys (3).
		Bolt, guide pulley to coolant pump/oil filter/timing case cover	*BA13.25-P-1005-01Y
11	Install in the reverse order

BELT TENSIONING DEVICE

Number	Designation		Engine 157	Engine 278
BA13.25-P-1001-01Y	Bolt, poly-V belt tensioning device to timing case cover	Nm	20	20

BELT TENSIONING DEVICE

Number	Designation		Engine 157	Engine 278
BA13.25-P-1002-01Y	Bolt, guide pulley to carrier	Nm	70	70

BELT TENSIONING DEVICE

Number	Designation		Engine 157	Engine 278
BA13.25-P-1003-01Y	Bolt, guide pulley carrier/ABC pump to timing case cover/coolant pump	Nm	20	20

BELT TENSIONING DEVICE

Number	Designation			Engine 157	Engine 278
BA13.25-P-1005-01Y	Bolt, guide pulley to coolant pump/oil filter/timing case cover	M8	Nm	35	35
BA13.25-P-1005-01Y		M10	Nm	35	35