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Front Door Limiter Replacement
 
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Pelican Technical Article:

Front Door Limiter Replacement

Tom Morr

Time:

2 hours2 hrs

Tab:

$70

Talent:

**

Tools:

Torx bits, 10mm wrench, Phillips screwdriver, trim removal tools

Applicable Models:

Mercedes-Benz R170 (1998-04)

Parts Required:

Replacement check limiter

Hot Tip:

Remove the unit through the speaker hole

Performance Gain:

The door will stop before it overextends the hinges

Complementary Modification:

Upgrade the door speaker

The arm that limits how far the door opens is known as the check, stay or limiter. Regardless of what it's called, this assembly keeps the door from crunching into the front fender.

The inner door panel must be removed to access the limiter. (Please refer to that article for details.) Once the panel is off, the speaker is removed, then the weather shield membrane is peeled back rearward (see images below).

Some SLK models have the lock/latch riveted to the door panel. Luckily, the early R170 models use two bolts that take T30 Torx bits. Torque spec on these is 8 Nm ±2.

Leaving the window all the way up will maximize clearance inside the door panel.

After removing the door panel, unplug the speaker.
Figure 1

After removing the door panel, unplug the speaker.

To remove the speaker, undo three Phillips screws (purple arrows).
Figure 2

To remove the speaker, undo three Phillips screws (purple arrows).

Pull the rubber sealing boot off the body.
Figure 3

Pull the rubber sealing boot off the body. Use a T50 Torx bit to unscrew the newly revealed bolt (purple arrow).

Slide the retaining plate (purple arrow) and sealing boot off the limiter.
Figure 4

Slide the retaining plate (purple arrow) and sealing boot off the limiter. Save them for re-use if they aren't damaged.

The limiter mounts to the door with three bolts (purple arrows), all of which take a 10mm wrench/socket.
Figure 5

The limiter mounts to the door with three bolts (purple arrows), all of which take a 10mm wrench/socket.

Remove the limiter from the door through the speaker hole.
Figure 6

Remove the limiter from the door through the speaker hole.

Our existing limiter reveals that our project car's door was repainted.
Figure 7

Our existing limiter reveals that our project car's door was repainted. All replacement components are available individually, in case the hardware and boot can be reused. Installation is the reverse of removal. When installing the limiter, tighten the two jamb bolts first and then do the bolt above the speaker.

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