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Pelican Technical Article:

Accessory Drive Belt

Kerry Jonsson

Time:

30 minutes30 mins

Tab:

$50

Talent:

**

Tools:

17mm socket with ratchet and short extension

Applicable Models:

Mercedes-Benz E320 (2003-09)

Parts Required:

Drive belt

Hot Tip:

Take a photo of belt routing to view during installation .

Performance Gain:

Replace broken or cracked drive belt

Complementary Modification:

Change belt tensioner while you're at it

Your engine is one component of the car that provides power to move it. All other systems use this power generated by the engine. The crankshaft of your engine drives an accessory drive belt. This accessory drive belt runs your water pump, alternator, power steering pump and your air conditioning compressor. Mercedes Benz uses a single serpentine belt. If this build were two break the engine would soon over heat as a result of the water pump no longer spinning. The battery would eventually go dead because the alternator would not be able to charge the battery. Power steering will also get stiff and you wouldn't be able to use the air conditioner. Check for cracks on the inner side of the belt whenever you perform a service underneath the hood of your car. In this tech article we will go over how to replace your accessory drive belt.

This picture illustrates the front of the engine.
Figure 1

This picture illustrates the front of the engine. WeÂ're looking at the routing of the accessory drive belt. Locate the drive belt tensioner (green arrow).

This picture illustrates the bottom of the drive belt tensioner.
Figure 2

This picture illustrates the bottom of the drive belt tensioner. WeÂ're going to use the 17 mm lug (green arrow) to move the tensioner and take tension off of the belt.

Use a 17 mm socket with ratchet and rotate the 17 mm lug counterclockwise to take tension off of the accessory drive belt.
Figure 3

Use a 17 mm socket with ratchet and rotate the 17 mm lug counterclockwise to take tension off of the accessory drive belt.

While holding the tensioner pull the belt off of the pulleys.
Figure 4

While holding the tensioner pull the belt off of the pulleys. If it is very important you remember the routing of the belt for installation. Installation is the reverse of the removal steps. Route the belt around all the pulleys, starting at the crankshaft position pulley, working your way around and ending with the tensioner pulley. Rotate the tensioner and fit the belt over the tensioner pulley. When you release the tensioner it will tighten the belt. Start the engine and verify the belt rides smooth on the pulleys.

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Page last updated: Thu 11/23/2017 02:30:08 AM