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

ENGINES 157 in MODEL 463 

Fig 1: Belt Drive Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove center section of engine cover	Ensure correct seating of the engine cover.
2	Remove fan unit		AR20.40-P-5050GW
3	Slacken poly-V belt and remove	To do so, swivel 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
4	Inspect belt pulley sections, tensioning device (1) and guide pulleys (3)	Check for damage, wear and dirt; replace if necessary.
5	Check poly-V belt	Check for damage, wear and dirt; replace if necessary.
	Only perform Operation steps 6 through 9 for remove/install of clamping device (1).
6	Lock clamping device (1)	Swivel clamping device (1) at hexagon (4) counterclockwise and lock in place using drift (8).
7	Remove screw/bolts on clamping device (1)		*BA13.25-P-1001-01Y
8	Remove clamping device (1) upwards
9	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)
10	Remove LH charge air duct	When removing the upper guide pulley (3) on the left side of the engine	AR09.41-P-8620GW
11	Remove screw/bolts for guide pulleys (3)		*BA13.25-P-1002-01Y
			*BA13.25-P-1005-01Y
12	Remove guide pulleys (3)
13	Install in the reverse order

BELT TENSIONING DEVICE

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