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

ENGINES 272, 273 in MODEL 211, 219 

Fig 1: Identifying Belt Drive Components (1 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Belt Drive Components (2 Of 2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing
	Risk of injury  caused by moving parts that can pinch, crush  or, in extreme cases, even sever extremities	No parts of the body or limbs should be within the operating range of the mechanism when moving components.	AS00.00-Z-0009-01A
1	Pull out front engine cover (1) from mounts
2	Loosen poly-V belt (2) and remove	To do this, swivel tensioning device (3) in anti-clockwise direction at hexagon (4) (arrow). Remove poly-V-belt (2) and release tension at tensioning device (3).
	Checking
3	Inspect belt pulley sections, tensioning device (3) and guide pulleys (5)	Check for damage, wear and dirt; replace if necessary.
4	Check poly-V belt (2) and replace if required
	Check poly-V belt for wear and damage		AP13.22-P-1352TS
	Remove, install tensioning device	Only perform steps 5 through 8 for remove/install of clamping device (3).
5	Lock tensioning device (3)	Swivel clamping device (3) at hexagon (4) in an anti-clockwise direction and lock in place using drift (6).
6	Remove bolts (3b) and remove clamping device (3)		*BA13.25-P-1001-01P
7	Slacken tensioning device (3)	When replacing the clamping device (3) Clamp tensioning device (3) in a vise, swivel at hexagon (4) in an anti-clockwise direction, pull out drift (6) and slacken tensioning device (3). Installation:  The tensioning device (3) can only be installed when locked.
8	Install in the reverse order
	Remove/install guide pulleys	Only perform steps 9 through 12 for remove/install of guide pulleys (5).
9	Pry off covers (5b)
10	Remove bolts (5a)		*BA20.10-P-1004-01U
11	Remove guide pulleys (5)
12	Install in the reverse order
	Install
13	Fit on poly-V belt (2), then clamp	To do this, swivel tensioning device (3) in anti-clockwise direction at hexagon (4) (arrow). Mount poly-V-belt (2) as shown on routing diagram and release tensioning device (3). See poly-V belt routing diagram Do not use wax or similar products, as this may cause poly-V belt (2) to slip.	AR13.22-P-3902-02TS
14	Install front engine cover (1)

BELT TENSIONING DEVICE

Number	Designation		Engine 272	Engine 273
BA13.25-P-1001-01P	Bolt from poly-V belt tensioning device to timing case cover	Nm	35	35

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation			Engine 272	Engine 273
BA20.10-P-1004-01U	Bolt, guide pulley between water pump and belt tensioner	Initial installation	Nm	35	35
		Follow-up operations	Nm	25	25