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

Engine 274.9 in model 205 (except 205.047/147/247) 

Engine 274.9 in model 253 (except 253.354/954) 

Shown on engine 274.9 with code (494) USA version 

Courtesy of MERCEDES-BENZ USA

Shown on engine 274.9 with code 494 (USA version) 

Courtesy of MERCEDES-BENZ USA

	Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	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 mechanical components when moving components.	AS00.00-Z-0009-01A
	Remove
1	Remove engine air intake duct upstream of air filter
2	Turn clamping device (4) on multi-tooth pin (3) counterclockwise and lock with a suitable drift
3	Remove the poly-V belt (1)
4	Remove drift from clamping device (4)
5	Remove screw/bolt (5) and remove clamping device (4)
6	Remove screw/bolt and remove guide pulley from alternator	Engine 274.9 in model 205.048/049/148/248/348/349/448/449 Engine 274.9 in model 253.349/948/949
	Install
7	Check the poly-V belt (1) for damage and replace if necessary		AP13.22-P-1351-01A
8	Check clamping device (4) for damage and replace if necessary
9	Check guide pulley for damage and replace if necessary	Engine 274.9 in model 205.048/049/148/248/348/349/448/449 Engine 274.9 in model 253.349/948/949
10	Check belt pulley/vibration damper for damage and replace if necessary		AR03.30-P-1600MRA
11	Check belt pulley for alternator for damage and replace if necessary		AR15.40-P-5710LWA
12	Check belt pulley for A/C compressor for damage and replace if necessary	Engine 274.9 in model 205 (except 205.047/147/247) except code ME06 (Hybrid drive 60 kW variant (incl. plugin)) Engine 274.9 in model 253 (except 253.354/954)	AR83.55-P-5310LW
13	Check belt pulley of coolant pump for damage and replace if necessary	Engine 274.9 in model 205.048/049/148/248/348/349/448/449 Engine 274.9 in model 253.349/948/949	AR20.10-P-1271MRS
14	Position guide pulley on alternator and tighten screw/bolt	Engine 274.9 in model 205.048/049/148/248/348/349/448/449 Engine 274.9 in model 253.349/948/949 Bolt, guide pulley to alternator	*BA13.25-P-1004-01Z
15	Position clamping device (4) and tighten screw/bolt (5)	Bolt, tensioning device to crankcase	*BA13.25-P-1003-01Z
16	Turn clamping device (4) on multi-tooth pin (3) counterclockwise and lock with a suitable drift
17	Fit on poly-V belt (1)	Routing diagram for poly-V belt Do not use belt wax or similar products. This leads to slipping of the poly-V belt (1).	AR13.22-P-3902-02MRA
18	Remove drift and tension poly-V belt (1) with clamping device (4)
19	Push back clamping device (4) onto multi-tooth pin (3) clockwise using a torque	Pretension for poly-V belts on multi-tooth clamping device	*BA13.25-P-1005-01Z
20	Install engine air intake duct upstream of air filter
21	Install upper engine cover
	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
22	Perform an engine test run and check engine for proper function