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Replacing Your Mercedes Poly V-Belt
 
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Pelican Technical Article:

Replacing Your Mercedes Poly V-Belt

Steve Vernon

Time:

1 hour1 hr

Tab:

$25

Talent:

*

Tools:

E10 Torx driver

Applicable Models:

Mercedes-Benz ML320 (1998-03)
Mercedes-Benz W203 (2001-07)

Parts Required:

New drive belt

Hot Tip:

Be careful working around your radiator

Performance Gain:

Won't leave you stranded at the side of the road

Complementary Modification:

New tensioner

You should check your V-belt every six months for wear, cracking, fraying, delaminating and drying out. If your belt shows any of these signs you should replace it. I recommend you buy two belts and always keep an extra one in the car. You don't want to be stranded on the side of the road for the lack of a spare drive belt.

The belt on our project car was one of the worse looking belts I have ever seen on a running car. If your belt looks like the one pictured here you should seriously change it ASAP.

Replacing the belt on your Mercedes-Benz W203 is one of the easiest jobs you will do. You should be able to do it in less than 30 minutes and is a great starter project if you are just beginning to DIY or "Do It Yourself" on your car.

Let the car cool so you don't have to work around a hot engine. With the hood open all you need is an E10 (reverse Torx socket) and driver. Locate the tensioner and using the Torx driver turn it counter-clockwise 45 degrees. You can now slip the belt off the tensioner and install the new one.

You can also lock the tensioner into the open position if you need both hands to install the new belt. Turn the tensioner all the way counter-clockwise and insert a retaining pin between the rotating part and the tensioner base. If you do not have a retaining pin you can use a 5mm Allen key.

There is a picture below that shows you the routing of the belt that you can use to install the new one.

Installation is the reverse of removal. Make sure the belt is properly seated on all the pulleys and that it follows the right path.

You should check your V-belt every six months for wear, cracking, fraying, delaminating and drying out.
Figure 1

You should check your V-belt every six months for wear, cracking, fraying, delaminating and drying out. If your belt shows any of these signs you should replace it. The belt on our project car was one of the worse looking belts I have ever seen on a running car. If your belt looks like the one pictured here (red arrow) you should seriously change it ASAP.

Locate the tensioner and using the Torx driver turn it counter-clockwise 45 degrees.
Figure 2

Locate the tensioner and using the Torx driver turn it counter-clockwise 45 degrees. You can now slip the belt off the tensioner and install the new one.

You can also lock the tensioner into the open position if you need both hands to install the new belt.
Figure 3

You can also lock the tensioner into the open position if you need both hands to install the new belt. Turn the tensioner all the way counter-clockwise and insert a retaining pin between the rotating part and the tensioner base. If you do not have a retaining pin you can use a 5mm Allen.

This is a picture that shows you the routing of the V-belt; the tensioner is shown by the red arrow.
Figure 4

This is a picture that shows you the routing of the V-belt; the tensioner is shown by the red arrow. Note: the front of the car has been removed to give you a better view.

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Comments and Suggestions:
shawnymike Comments: Hi. My AC Compressor is bad and it's pulley is bent. Is there a shorter belt I can buy and just bypass it? I have an 04 mercedes C32 AMG. Thank you
October 22, 2016
  Followup from the Pelican Staff: I am not 1005 sure. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Kenny uk Comments: Mercedes C220 2.1 Classic 2004 54 plate UK
Hi thank you very much for pictures and the walkthru. It was exactly as you said. But the tensioner on mine was a T60 bit. I had to check my car manual for that info. Really easy to pull tensioner back and chuck new belt on. Thanks.
August 17, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Reez Comments: Hey there...thanx for the speedy reply...Well on the Mercedes it does an electronic check on the oil level...Is there another way to check the oil level??? just a thought, could it be low gearbox oil??? I know it shouldn't have any effect but not sure how these cars operate, so like they say, rather ask a stupid question...
March 23, 2016
  Followup from the Pelican Staff: If your vehicle does not have a dipstick, no other way to check. - Nick at Pelican Parts  
Fareez Comments: Hi...Just came across your site & I must say its very informative & cost saving...A BIG thumbs up...I own a C230 kompressor 2005, & on cold start or if its been standing a while, has a noisy sound for a couple of seconds...I have had the sprockets & timing-chain/tensioner done & replaced alternator already...sounds like an exhaust vibration...any ideas would be greatly appreciated...thanx...Reez...
March 23, 2016
  Followup from the Pelican Staff: Have you checked oil pressure and level? It may be low when starting. - Nick at Pelican Parts  
Bob Comments: I have a 2002 M-B C230, the C203W. The air cleaner box is in the front. How do I remove it? Thanks
December 28, 2015
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Surjb Comments: Hi, thanks all the way from the UK. This guide helped lots when I changed the belt today on my 2005 c220 Cdi sports coupe. In total it took me 20mins from start to finish and the annoying chirp noise has gone. :
December 28, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
SpawnyWhippet Comments: Trying to do this job on my 2007 C230 and the torx bolt in the tensioner is just coming undone instead of moving the belt tensioner. Any workarounds for this? Do I need to just undo the bolt, remove the pulley and apply some threadlock?
August 28, 2015
  Followup from the Pelican Staff: That is not how you relieve the tensioner on your model. Try just below the belt and pulley on the tensioner, there should be a hex boss. - Nick at Pelican Parts  
Mario Comments: I change the belt and a idle pulley on a 2000 E320 it was exactly the way you show us.
Thank you ! !
July 23, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
sim Comments: The repair seems very simple, however, my drive belt is very well hidden behind my radiator. I'm a home mechanic, and so don't have access to a car hoist etc - is this DIY job still doable?
June 21, 2015
  Followup from the Pelican Staff: Yes, it is. - Nick at Pelican Parts  
algodban Comments: Dear sirs,
I will be very happy if you show me how to remove the alternator of mercedes A class 170 DCI for check and repair and sub sequent of cheching the steering pump and its electronics .
Best wishes.
Abdul
January 24, 2015
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
ClaytonMoura Comments: Good Evening! First of all VERY VERY VERY thank you I should buy another MB to mine collection with all the money I avoid to spent - thanks to your orientation posted at this website...
I live in Brazil where the parts and services are too expensive and I had a C240-V6 yr.2004. The Torx driver used to release the tensioner in my car is an E10 Torx TR. Did you see this kind of tool in other MB models? Thanks for your attention and Congratulations for your fantastic job. By the way, do you ship parts to Brazil?
August 25, 2014
  Followup from the Pelican Staff: Yes, External Torx are quite popular. Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
poconojoe Comments: I have to say that your technical articles are great. It's really a unique way to help your customers with their projects. Although the Benz I am working on has a different tensioner, I still appreciate the descriptions and photos. Hey, your prices are great too!
August 15, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Were you able to get the tesnioner to release? - Nick at Pelican Parts  
thabang Comments: Its very helpful this page j really appreciate I am in south africa and how much is tjis belt poly v belt
May 22, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Mr. B Comments: I have a 2002 C240 and the poly V belt is loosened via a 17mm hex located on the tensioner bracket in about the 4 o'clock position relative to the tensioner pulley.
February 6, 2014
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 

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