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Pelican Technical Article:

Removing the Vibration Dampener

Mike Holloway

Time:

1 hour1 hr

Tab:

$0

Talent:

**

Tools:

27mm Socket wrench, breaker bar, 6-inch extension

Applicable Models:

Mercedes-Benz R107 (1972-89)

Hot Tip:

Remove any component to provide more room

Performance Gain:

Access to crank hub and timing chain cover

Complementary Modification:

Timing chain, chain tensioner, tensioner rail, and cam sprocket replacement

One would think that when the engine is at speed there is a higher incidence of wear and eventual failure. This isn't necessarily true in the case of certain components, namely the timing chain. Chains, sprockets, gears and even bearings experience the most wear upon startup. The timing chain and the various components (guide rails, tensioning rail, chain tensioner) wear out after 100,000 miles and should be replaced. The sprockets should also be replaced. The chains can stretch but they also wear. As each rolling element of the link begins to experience wear it sets up for increased vibration and movement of the chain links and pins against the sprocket surface. As many teeth as the sprocket has, the chain has many more links. The sprocket surface wears down contributing to more movement as the chain passes over the sprocket surfaces. This creates an even greater opportunity for chain breakage.

The guide rails will be the first order of business to address. In order to change the guide rails in preparation for the replacement of the timing chain, all the components in front will have to be removed. This includes the belts, pulleysalternator, the distributor and the power steering pump were all removed. Please refer to these articles should you need assistance.

I also removed the radiator. Normally you wouldn't have to do that but it was already out due to the development of another article. Refer to removing the radiator article for help in that regard.

Also, the distributor should be set at top dead center (TDC) and marked. This is needed when you put everything back. The distributor was also removed earlier. Hence, you can refer to the distributor removal article if you need assistance.

The valve cover will have to be removed as well. In order to do that you will have to remove the air box. Refer to the valve cover removal article for help on how to do that project.

The chain guide is held in place by bearing bolts. These devilish devices provide hours of frustration if not properly dealt with. There are several ways in which they can be removed. The easiest way is to use a tool offered up by Pelican Parts called a rail pin puller guide with a 6mm extractor. Please refer to the removing the chain guide article for more information.

The top guide rails should also be replaced. It is not necessary to remove the timing chain cover to get at the guides but it would make the job easier. The lower ones shall be replaced but require the removal of the timing chain cover. That task is also required for the timing chain replacement. Referring to our article on guide rail replacement, it will help you with that project.

In order to get at the crank hub, the vibration dampener must be removed. The 27mm bolt holding it in place is torqued down to 200ft-lbs. A breaker bar will be required.

In order to remove the vibration dampener, it is required to have it held in place in order to remove the 27mm bolt.
Figure 1

In order to remove the vibration dampener, it is required to have it held in place in order to remove the 27mm bolt. After the crankcase pulley is removed, reattach two of the bolts back into the vibration dampener.

a 27mm socket with a 1/2-inch socket is recommended
Figure 2

a 27mm socket with a 1/2-inch socket is recommended

You will have to fit a large screwdriver into the gap on the vibration dampener in order to hold it in place.
Figure 3

You will have to fit a large screwdriver into the gap on the vibration dampener in order to hold it in place. 

If you use a 3/8 inch socket or extension you will shear it.
Figure 4

If you use a 3/8 inch socket or extension you will shear it. This happened to me as the picture attests. 

Here is a comparison of the sheared 3/-inch insert and the 1/2-inch insert.
Figure 5

Here is a comparison of the sheared 3/-inch insert and the 1/2-inch insert. What a difference a fraction of an inch makes.

Here is the freed bolt.
Figure 6

Here is the freed bolt. The 27mm bolt is held in place with 200ft-lbs. 

The vibration dampener is now free.
Figure 7

The vibration dampener is now free. 




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Comments and Suggestions:
Suffolkgold Comments: Why bother taking the 27m bolt out,it doesn't hold the damper onto the crank end the 6 13m bolts do that,take them out and wiggle the damper side to side after spraying with wd40 or such and it will come off.
May 6, 2015
  Followup from the Pelican Staff: I will ask our tech writer to clarify.

Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 

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