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

ENGINE 279 in MODEL 231 

Fig 1: Belt Drive Remove/Install Component

Courtesy of MERCEDES-BENZ USA

	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 the mechanism when the components are moving.	AS00.00-Z-0009-01A
	Remove/install
1	Remove engine cover
2	Remove air intake duct on the right and left
3	Loosen poly-V belt (1) and remove	To do this turn hexagon (2) of poly-V belt tensioning device (3) counterclockwise (arrow) until the tensioner pulley (5) can be locked with the drift. Use a drift with a diameter of 5 mm. Fit on poly-V belt and tension (1) as per routing diagram and tension. To do this swivel poly-V belt tensioning device (3) at hexagon (2) counterclockwise (arrow), fit on poly-V belt (1) and slacken poly-V belt tensioning device (3).
	Check
4	Check profile of belt pulley and poly-V belt tensioning device (3) for damage and soiling
5	Check poly-V belt (1) for damage and wear; replace if necessary
			AP13.22-P-1352EW
	Remove poly-V belt tensioning device (3)
6	Remove screw/bolts (4) and remove poly-V belt tensioning device (3)	When removing poly-V belt tensioning device (3). The poly-V belt tensioning device (3) can only be installed when locked. When replacing the poly-V belt tensioning device (3), clamp old poly-V belt tensioning device (3) into a vise, swivel at hexagon (2) counterclockwise (arrow), pull out drift and release tension at the poly-V belt tensioning device (3). Bolt, tensioning device to timing case cover	*BA13.25-P-1001-01ZA
	Check
7	Check tensioner pulley (5) for damage and dirt; replace if necessary	Bolt, tensioning device to timing case cover	*BA13.25-P-1001-01ZA
	Removal of the guide pulleys (6, 7)
8	Unclip covers (8)	When removing the guide pulleys (7)
9	Remove guide pulleys (6, 7)	When removing the guide pulleys (6, 7)
		Screw/bolt, guide pulley to right front cover/carrier	*BA13.25-P-1002-01ZA
		Screw/bolt, guide pulley to timing case cover	*BA13.25-P-1003-01ZA
	Check
10	Check guide pulleys (6, 7) for wear and dirt; replace if necessary
11	Install in the reverse order
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
12	Perform engine test run and check for correct seating of poly-V belt (1)

BELT TENSIONING DEVICE

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

BELT TENSIONING DEVICE

Number	Designation		ENGINE 279
BA13.25-P-1002-01ZA	Screw/bolt, guide pulley to right front cover/carrier	Nm	32

BELT TENSIONING DEVICE

Number	Designation		ENGINE 279
BA13.25-P-1003-01ZA	Screw/bolt, guide pulley to timing case cover	Nm	30