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Mercedes Benz Drive Belt Replacement
 
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Pelican Technical Article:

Mercedes Benz Drive Belt Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$25

Talent:

*

Tools:

Mercedes-Benz tool #103-0040, 8mm Hex, 13mm, 19mm socket

Applicable Models:

190E 2.6 (1987-1993)
190E 2.3 (1983-1993)

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 thermostat

You should check your drive 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.

There are several things that will need to come off the car to replace your belt including the fan. A word of caution here before you begin. Depending on the engine and accessories on your car there can be very, very little room to work between the fan and the radiator. You will need an 8mm Hex to remove the viscous clutch on the fan, and we had to grind one down to make it fit. The radiator is very expensive and delicate, and can be easily damaged while working around it. If you are going to be doing other work on the car and/or are worried about damaging your radiator, I recommend you remove it first. It is not a difficult job and can potentially save you a lot of money if you end up damaging it. Pelican has an article on how to remove your radiator if you want to go that route. That being said, you certainly can replace your belt with the radiator in, but I recommend you put a piece of cardboard over it to protect it while working.

Begin by removing the thermostat overflow hose from its clip on the top of the engine, and remove the distributor cover plate. It is held in by clips and just pulls off.

Next remove the fan shroud. Unclip the circular part of the shroud from the base by removing the circular clip on the right side. Turn the shroud to the right, separating the circular part from the base and place it over the fan. Pry the two clips connecting the base of the shroud to the radiator off and lift it from the engine compartment.

Insert Mercedes-Benz tool # 103-0040 behind the fan pulley, and seat it between the two groves on the housing. Gently turn the fan until the tool slips into the corresponding hole on the pulley. Remove the 8mm Hex bolt on the front of the fan, and remove the fan from the engine compartment.

With the fan out of the way, locate and loosen a half turn the 19mm fixing bolt on the belt tensioner. Locate the 13mm adjusting nut between the water and power steering pumps and loosen it.

With the nut loosened you can pull up on the belt and remove it from the pulleys.

Installation is the reverse of removal. Take care to make sure the belt is properly seated on all the pulleys, follows the right path, and everything is torque to specs.

Begin by removing the thermostat overflow hose from its clip on the top of the engine (yellow arrow) and pull off the distributor cover plate.
Figure 1

Begin by removing the thermostat overflow hose from its clip on the top of the engine (yellow arrow) and pull off the distributor cover plate.

This is what you will see on the right side of the engine.
Figure 2

This is what you will see on the right side of the engine. You will need to remove the clip that holds the circular shroud to the shroud base (yellow arrow). Turn the shroud right and separate it from the base, then place it back over the fan. From this angle you can see the fixing bolt (green arrow, bellow radiator hose) and the adjusting nut (red arrow).

Remove the clip holding the shroud base to the radiator (red arrow) on the passenger side.
Figure 3

Remove the clip holding the shroud base to the radiator (red arrow) on the passenger side.

Remove the clip holding the shroud on the driver side (yellow arrow); pull the shroud up and out of the engine compartment.
Figure 4

Remove the clip holding the shroud on the driver side (yellow arrow); pull the shroud up and out of the engine compartment.

Place the Mercedes-Benz tool # 103-0040 (yellow arrow) in between the grooves on the housing and slowly rotate the fan until the tool engages the hole in the back of the pulley.
Figure 5

Place the Mercedes-Benz tool # 103-0040 (yellow arrow) in between the grooves on the housing and slowly rotate the fan until the tool engages the hole in the back of the pulley. Insert lower right shows what it looks like with the pulley off.

With the tool in place preventing the fan pulley from spinning you can remove the 8mm Hex bolt from the fan and remove the fan from the engine.
Figure 6

With the tool in place preventing the fan pulley from spinning you can remove the 8mm Hex bolt from the fan and remove the fan from the engine. Note: we have removed the radiator in our project car to give you a better photo of what you will be working on.

In this picture you can see how little room there is to work.
Figure 7

In this picture you can see how little room there is to work. It can be incredibly frustrating, especially if you have larger hands.

Loosen the fixing nut on the belt tensioner a 1/2 turn (yellow arrow).
Figure 8

Loosen the fixing nut on the belt tensioner a 1/2 turn (yellow arrow).

Loosen the adjusting nut (green arrow).
Figure 9

Loosen the adjusting nut (green arrow).

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Comments and Suggestions:
scott Comments: How to adjust RPM up when turn on the air conditioning RPM go down to low cost engine checking.
June 28, 2015
  Followup from the Pelican Staff: What vehicle? It may not be adjustable. - Nick at Pelican Parts  
silvercloud2 Comments: Guess that would help...........1993 190E 2.6
Thanks
March 15, 2015
  Followup from the Pelican Staff: I think your engine has an auto belt tensioner. No adjustment needed.

See this info regarding the markings. I think this may be what you are looking for:

The adhesive plate used (Fig. A) (arrow) has been replaced as of February 1988 by a cast setting scale (Fig. B) (arrow).
On vehicles with adhesive plate (Fig. A) (arrow), tension poly-V-belt as follows.
Turn tensioning nut (5) until setting pointer (13) is matched with the following scale graduations.
Engine w/o A/C compressor 5th graduation
Engine with A/C compressor 7th graduation
- Nick at Pelican Parts
Silvercloud2 Comments: The belt tensioner has a indicator on it, I presume to tell where the belt is at the correct tension. When changing the belt or idler pulley, where should the pointer be on the indicator on the tensioner






The belt tensioner has an indicator on it. When changing the belt or idler pulley, where should the pointer be on this indicator when all is properly adjusted?

Thyank you



March 13, 2015
  Followup from the Pelican Staff: What vehicle are you working on? - Nick at Pelican Parts  
zietgist Comments: am having trouble getting the adjusting rod on the tentioner and not sure how it is suppose to be oriented. ie, to the right side of the nut or left side
January 31, 2015
  Followup from the Pelican Staff: Going from memory, I think it is on the right side. - Nick at Pelican Parts  
Matt Comments: Alright, i don't think its aftermarket but I'm not sure, is there any other way to hold it in place without breaking something? I got the belt off but idk if i will be able to put new one on without taking the fan off.
June 8, 2014
  Followup from the Pelican Staff: You can use a universal counterhold tool or a strap wrench. - Nick at Pelican Parts  
Matt Comments: I'm having a real hard time finding the holes behind the fan to get it to stay in place i was out there maneuvering all over the place and cant catch one and also cant even see them.
June 6, 2014
  Followup from the Pelican Staff: If you have an aftermarket part, the hole may not be present. - Nick at Pelican Parts  

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