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Removal and Installation of Ignition Switch
 
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Pelican Technical Article:

Removal and Installation of Ignition Switch

Mike Holloway

Tools:

10mm Allen socket breaker bar, 6-inch socket extension, 2-foot long 1-inch diameter pipe, flathead screwdriver, large paper clip, 10mm open end wrench

Applicable Models:

Mercedes-Benz R107 (1975-86)

Parts Required:

Steering lock, Pelican part #116-462-10-30-M22

Hot Tip:

Disconnect battery

Performance Gain:

The ability to drive your vehicle

Complementary Modification:

Replace the instrument cluster

Over time, the steering lock can fail. The first indication may be that you cannot engage the ignition. The steering wheel may also either remain in the locked position or it may not lock at all. If either one of these situations occur, the steering lock may have to be replaced. You can have your car towed to a service garage where they may charge you a few hundred dollars to repair and replace the lock or you can do it yourself. It is actually very easy but time consuming. There are a few techniques that come in handy. See our articles for removing the steering wheel, instrument cluster panel, and the ignition switch. Doing these first will make the job much easier.

Before you do any work on your car it is important that you wear safety glasses, work gloves. Protect your eyes, hands and body from dust, debris as well as sharp objects and edges while working on your vehicle. Disconnect the battery before beginning work. Never work on your vehicle if you feel the task is beyond your ability.

Before the steering wheel can be removed, the steering wheel pad must be removed.
Figure 1

Before the steering wheel can be removed, the steering wheel pad must be removed. To do this, simply lift the pad off the clips holding it in place.

An alternative method to remove the steering wheel without removing the pad involves the removal of the emblem in the center in order to access the Allen screw.
Figure 2

An alternative method to remove the steering wheel without removing the pad involves the removal of the emblem in the center in order to access the Allen screw. If you do not want to remove the pad you can loosen the Allen screw but you will need to have someone hold the steering wheel in place as you attempt to loosen the Allen screw. Removing the emblem is easy and done so by lifting it off with a flathead screwdriver. 

Once the pad is liberated from the wheel, simply lift it off the clips.
Figure 3

Once the pad is liberated from the wheel, simply lift it off the clips.

Once the pad is removed you will have access to the lead for the horn switch.
Figure 4

Once the pad is removed you will have access to the lead for the horn switch. Disconnect the lead from the wheel.

Slide the pipe through the steering wheel as pictured.
Figure 5

Slide the pipe through the steering wheel as pictured. This will help to provide leverage when loosening the Allen screw. Using a 10mm Allen wrench with a six-inch extension on the breaker bar. If you line up the breaker bar with the pipe, simply force the breaker bar down as you pull the pipe up. Using equal force will allow you to loosen the screw without turning the wheel. After the screw is removed the steering wheel can then be removed. 

Once the steering wheel is removed, the instrument cluster can be removed by lifting the top edge.
Figure 6

Once the steering wheel is removed, the instrument cluster can be removed by lifting the top edge.

Once the top edge is lifted up, pull the instrument cluster forward.
Figure 7

Once the top edge is lifted up, pull the instrument cluster forward. There will be several cables attached to the instrument cluster.

The speedometer cable is attached to the instrument cluster with a cable screw.
Figure 8

The speedometer cable is attached to the instrument cluster with a cable screw. Unscrew the cable from the back of the instrument cluster.

The back of the instrument cluster has a few other cables that are various indicator lights and fluid level indicators.
Figure 9

The back of the instrument cluster has a few other cables that are various indicator lights and fluid level indicators.  

Disconnect the tachometer lead.
Figure 10

Disconnect the tachometer lead.

Disconnect the sensor indicator.
Figure 11

Disconnect the sensor indicator.

The instrument panel cluster can now be removed.
Figure 12

The instrument panel cluster can now be removed. There is a plastic part that has to be installed prior to fitting the instrument cluster.

Now you must remove the ignition switch.
Figure 13

Now you must remove the ignition switch. Using a flathead screwdriver, lift off the chrome cover from the ignition switch.

Turn the key to the second position.
Figure 14

Turn the key to the second position. That would be the position that turns on the auxiliary power and instrument cluster.

There will be an access hole that is approximately a millimeter or two in diameter.
Figure 15

There will be an access hole that is approximately a millimeter or two in diameter. It is just wide enough for a large paper clip to fit in. Press the clip till you feel a click. This will force the keyway to depress and allow the shroud to be unscrewed.

16: Unscrew the key shroud.
Figure 16

16: Unscrew the key shroud.

17: The ignition switch can now be pulled out.
Figure 17

17: The ignition switch can now be pulled out. 

You will notice in this picture that the keyway is depressed when the paper clip is inserted.
Figure 18

You will notice in this picture that the keyway is depressed when the paper clip is inserted.

Notice how the keyway engages when the paperclip is removed.
Figure 19

Notice how the keyway engages when the paperclip is removed. The switch is now free to be removed.

There is an attaching screw that holds the steering lock in place.
Figure 20

There is an attaching screw that holds the steering lock in place. It is not easy to see. You can use a mirror, a cell phone camera (put in selfie mode), or just feel around. I used my cell phone camera to take this picture.

Using a 10mm open-end wrench, loosen and remove the attaching screw.
Figure 21

Using a 10mm open-end wrench, loosen and remove the attaching screw.

Disconnect the plug connection from the ignition switch.
Figure 22

Disconnect the plug connection from the ignition switch.

There is a lock pin (red arrow) that holds the steering lock in place.
Figure 23

There is a lock pin (red arrow) that holds the steering lock in place. Depress this pin with the edge of a screwdriver or a large paperclip. As you depress the lock pin, pull the steering lock away from the steering column.

The steering lock is now free to be removed and be replaced.
Figure 24

The steering lock is now free to be removed and be replaced.
Installation is the reversal of removal. 


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Comments and Suggestions:
Bob Gurin Comments: Finally got the lock out. 36 year old Mercedes part. I ground off the picture 23 pin and slowly was able to get the lock slid out. My wife took pictures of all numbers and need to be certain the new unit is correct. If you have questions this would be the time to get them answered.
I do need to be sure that when the rear lug is in place that it all works with no programming etc. as soon as pictures are on my computer I will send them . Once the numbers are confirmed we need the part. Please let me know how to proceed. What does #2 mean if you take the lick cylinder out that may work ??? What is Nick saying?
Anyhow step 1 is done
Regards , Bob Gurin

August 19, 2016
  Followup from the Pelican Staff: Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.


Assuming you are referring to my answer on your first question about using your vehicle with no key. If you took the lock cylinder out of the vehicle, you may be able to run it with a tool that will turn the switching mechanism. - Nick at Pelican Parts
 
Bob Comments: Tried to remove the lock with suggestions . No luck. Moving lock assembly tilting gives best pin position but not enough to let me move the lock assembly. Any other ideas? Hard to work it with a mirror. Next step will be to try and reach it and use Dremel to see if it will come off or be able to grind it to a shorter length.
August 18, 2016
  Followup from the Pelican Staff: No other ides than what i stated. - Nick at Pelican Parts  
Bob Comments: 1980 450SLC replaceing ignition lock and switch - got tech article which works perfectly up until picture 23 button release and lock removal. Button seems to not clear and cannot seem to get it to hold down and, cannot get a wrench on the lock to remove it. HELP! How do I reach and force the darn thing out. Using a mirror to hit the button and I am really not good at working backwards.
August 18, 2016
  Followup from the Pelican Staff: Is your steering lock in the same position as when the lock cylinder was removed? if not, the button may not go all the way in.- Nick at Pelican Parts  
David Comments: Does the steering lock come out through the dash opening for instrument cluster or the keyhole?
August 16, 2016
  Followup from the Pelican Staff: It comes out from under the instrument panel. - Nick at Pelican Parts  
Bob Comments: Re figure 23. Driving me crazy - does not release and cannot see a way to get to it. Any advice???
August 16, 2016
  Followup from the Pelican Staff: Try gently rocking the steering wheel. it may be jammed. - Nick at Pelican Parts  
Bob Comments: 1980 Mercedes 450slc replacing whole assembly steering lock, ignition key and ignition keys,
Question 1: can I disconnect the steering lock and still operate the car?
Question 2: can I eliminate the current no good key and use a screwdriver as the key for temporary use of the vehicle?
Question 3:: about how long will full removal replacement take. I have most tools needed
August 15, 2016
  Followup from the Pelican Staff: 1: no. it has electrical components on it.

2: If you took the lock cylinder out that may work.

3: 2 - 3 hours. - Nick at Pelican Parts
 

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Page last updated: Fri 12/9/2016 02:54:39 AM