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Removing and Replacing the Engine Mounts
 
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Pelican Technical Article:

Removing and Replacing the Engine Mounts

Mike Holloway

Time:

1 hour1 hr

Tab:

$27

Talent:

**

Tools:

6mm Allen wrench and socket, 10mm socket, 10mm wrench, Vise grip pliers, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Mercedes-Benz R107 (1975-86)

Parts Required:

Engine mounts Pelican part # 107-241-23-13-M290 (right), 107-241-24-13-M290 (left)

Hot Tip:

Remove coolant reservoir

Performance Gain:

Better handing, less vibration, smoother ride, and increased tire life

Complementary Modification:

Replace engine shock absorbers

Your engine produces vibration that can have an effect on the ride and comfort as well as influencing the longevity of components within the engine. The engine mounts will dampen the vibration that occurs but they can wear out over time. Replacing them is a straightforward job.

Before you begin, place a hydraulic jack under the oil pan and lift it just until you feel strong resistance. Slide a jack stand under the oil pan. This will lift the engine slightly and relieve the pressure on the shock absorbers.

Before you do any work on your car it is important that you wear safety glasses and work gloves. If you have to jack up your car, make sure to use jack stands and chock your wheels as well as applying the parking brake. Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. Never work on your vehicle if you feel the task is beyond your ability. Always disconnect the battery before working on your car.

The engine's shock absorbers are located on either side of the engine bay.
Figure 1

The engine's shock absorbers are located on either side of the engine bay. The passenger side engine shock absorber is located under the coolant reservoir. While it is not essential that the reservoir be removed, removing it provides more space. The driver side engine shock absorber is easier to get to.

Using a 10mm wrench, begin to loosen the nut located at the bottom of the shock absorber.
Figure 2

Using a 10mm wrench, begin to loosen the nut located at the bottom of the shock absorber. You will notice that the nut will not release from the threads unless the shaft is held in place.

Apply a pair of vise grip pliers to the shaft in order to hold it in place.
Figure 3

Apply a pair of vise grip pliers to the shaft in order to hold it in place.

Once the bottom nut has been removed, using a 10mm socket loosen the top nut while holding the shaft of the shock absorber.
Figure 4

Once the bottom nut has been removed, using a 10mm socket loosen the top nut while holding the shaft of the shock absorber.

Take off the fittings from the top of the shock absorber.
Figure 5

Take off the fittings from the top of the shock absorber. These shall be replaced as well.

Using a 20mm socket, loosen and remove the engine mount bolt from the frame.
Figure 6

Using a 19mm socket, loosen and remove the engine mount bolt from the frame. This will allow for the shock absorber to be released. 

In order to remove the engine mount, the weight of the engine must be relieved from the mount.
Figure 7

In order to remove the engine mount, the weight of the engine must be relieved from the mount. Using a jack, lift the engine by placing the jack under the oil pan. You only have to raise the engine by a quarter of an inch. 

Using a 6mm Allen wrench, loosen and remove the Allen bolts closest to the engine that holds the engine mount.
Figure 8

Using a 6mm Allen wrench, loosen and remove the Allen bolts closest to the engine that holds the engine mount.

Using a 6mm Allen and a socket wrench, loosen and remove the Allen bolt furthest from the engine.
Figure 9

Using a 6mm Allen and a socket wrench, loosen and remove the Allen bolt furthest from the engine.

The engine mount is now free and can be replaced.
Figure 10

The engine mount is now free and can be replaced. 

Installation is the reversal of removal.


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Comments and Suggestions:
berntd Comments: 19mm socket for the engine mount bolt figure 6. Not 20
January 12, 2017
  Followup from the Pelican Staff: Thanks for the Info. We appreciate it. I will have article updated.
- Nick at Pelican Parts
 
John b Comments: Where dose the spring that comes with the new motor mount go .the old one did not have the spring clip when l took it out? Jb
September 7, 2016
  Followup from the Pelican Staff: Your model may not use the spring. - Nick at Pelican Parts  

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Page last updated: Sun 2/19/2017 02:55:02 AM