Remove/install belt drive components - AR13.20-P-0001MLJ

ENGINES 157, 278 in MODEL 166 

Shown on engine 278 

Fig 1: Identifying Belt Drive Remove/Install Components - Shown On Engine 278

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, liftgates or sliding roof	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
1	Remove engine covers
2	Remove both intake air ducts
3	Detach oil lines at oil filter housing	Engine 157
4	Slacken poly-V belt and remove	To do this, turn clamping device (1) at hexagon (4) counterclockwise, remove poly-V belt and detension clamping device (1). Do not use any belt wax or similar products. This leads to slipping of the poly-V belt.
		Observe routing diagram for poly-V belt.	AR13.22-P-3902-02MM
	Checking
5	Inspect belt pulley sections, tensioning device (1) and guide pulleys (3)	Check for damage, wear and dirt; replace if necessary.
6	Check poly-V belt	Check for damage, wear and dirt; replace if necessary.	AP13.22-P-1352EW
	Only perform Operation steps 5 through 9 for remove/install of clamping device (1).
7	Remove front underfloor paneling section	MODEL 166.0	AR61.30-P-1001GQ
8	Lock clamping device (1)	Turn clamping device (1) at hexagon (4) counterclockwise and lock in place using drift (8).
9	Remove screw/bolts on clamping device (1)		*BA13.25-P-1001-01Y
10	Remove clamping device (1) downwards
11	Slacken clamping device (1)	When replacing the clamping device (1) 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). The clamping device (1) can be mounted in both a locked and an unlocked condition.
	Only perform operation steps 10 through 12 for removal/installation of guide pulleys (3)
12	Remove left charge air ducts	When removing the guide pulley (3) on the left engine side	AR09.41-P-8620MLJ
13	Remove screw/bolts for guide pulleys (3)		*BA13.25-P-1002-01Y
			*BA13.25-P-1005-01Y
14	Remove guide pulleys (3)
	Only perform operation steps 13 and 14 for remove/install of the upper guide pulley (5)	Vehicles without code (468) ACTIVE CURVE SYSTEM
15	Remove bolts for upper guide pulley carrier (5)		*BA13.25-P-1003-01Y
16	Detach upper guide pulley (5) and carrier from timing case cover		*BA13.25-P-1005-01Y
17	Install in the reverse order

BELT TENSIONING DEVICE

Number	Designation			Engine 157	Engine 278
BA13.25-P-1001-01Y	Screw/bolt, poly-V belt tensioning device to timing case cover		Nm	20	20
BA13.25-P-1002-01Y	Screw/bolt, guide pulley to carrier		Nm	70	70
BA13.25-P-1003-01Y	Screw/bolt, guide pulley carrier/ABC pump to timing case cover/coolant pump		Nm	20	20
BA13.25-P-1005-01Y	Screw/bolt, guide pulley to coolant pump/oil filter/timing case cover	M8	Nm	35	35
		M10	Nm	35	35