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Engine Mount Replacement
 
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Pelican Technical Article:

Engine Mount Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$150

Talent:

***

Tools:

Set of sockets, (16mm), hydraulic jack, block of wood

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

Motor mounts and locking nuts

Hot Tip:

Replace in pairs

Performance Gain:

Reduce engine vibration

Complementary Modification:

Replace transmission mounts

The BMW Z3 drivetrain (engine and transmission) is supported by a system of mounts. In front, the engine rests on two engine mounts, one on each side of the engine. At the rear, the transmission rests on a pair of mounts, which are bolted to a crossbeam support underneath the vehicle.

When an engine mount begins to fail, you will feel more vibrations from the engine. The engine may sag in the engine bay or the engine may have excessive movement under torque if a mount is broken. When working under your vehicle, you may notice fluid leaking out of your engine mount. This means the mount has failed and should be replaced. BMW Z3 models do not have a lot of room for engine movement. If a mount fails, the engine-cooling fan can come in contact with the cooling fan shroud, breaking the cooling fan blades and possibly damaging other cooling system components. When replacing your engine mounts, always replace them in pairs. You will have to replace one side at a time, while supporting the engine from below. 

In this article, I'll go over the steps involved with replacing the engine mounts on the BMW Z3. A Z3 with a 4-cylinder engine was used in the article. 6-cylinder models are similar.

To avoid marring the paint and trim, work with a plastic prying tool or wrap a screwdriver tip with masking tape before prying out body or interior items.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches. 

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Jack up the front of your vehicle. See our tech article on jacking up your vehicle.

Note: The following steps highlight how to remove upper engine mount nuts. Only remove the side you are currently replacing. Do one side at a time.

Working in engine bay, locate top of motor mount.
Figure 1

Working in engine bay, locate top of motor mount. Left side engine mount shown in this photo looking past the steering shaft. View of the nut is obstructed by the power steering hose. Remove the 16mm nut from motor mount (green arrow). This is a locking nut, be sure to replace it.

Working in engine bay, locate top of motor mount.
Figure 2

Working in engine bay, locate top of motor mount. Right side engine mount shown in this photo, looking down past the ignition coil and exhaust manifold. Remove the 16mm nut from motor mount (green arrow). This is a locking nut, be sure to replace it. Note: The following steps highlight the removing the right side engine mount. Procedure is similar for left side.

Working below engine at sub frame, remove lower engine mount 16mm nut (green arrow).
Figure 3

Working below engine at sub frame, remove lower engine mount 16mm nut (green arrow).

Next, support engine from below using hydraulic jack.
Figure 4

Next, support engine from below using hydraulic jack. Place a block of wood between corner of engine oil pan and jack pad. If needed, remove the support brace below the oil pan.

Next, loosen the engine mount nut on opposite side of engine mount you are replacing, do not remove nut (green arrow) Doing this allows the engine to be raised enough to remove engine mount on opposite side of engine.
Figure 5

Next, loosen the engine mount nut on opposite side of engine mount you are replacing, do not remove nut (green arrow) Doing this allows the engine to be raised enough to remove engine mount on opposite side of engine. Left side mount shown in photo.

Jack up engine until engine mount can be removed from vehicle.
Figure 6

Jack up engine until engine mount can be removed from vehicle. You will see upper engine mount stud move free of upper bracket. Remove engine mount from vehicle. Transfer mount heat shield over to new mount if necessary. Install new engine mount. Slowly lower engine down on mount. Install new engine mount nuts and torque. Then repeat procedure for opposite side mount. When replacing right side engine mount, you will have to transfer heat shield over to new mount. Reassemble remaining items and recheck that all engine mount nuts are tight.

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Comments and Suggestions:
s14freak Comments: Did this project today. With the left side completed leaving loose nuts it was impossible to gain enough clearance to remove the right side mount even though the old engine mount was pancaked. I got around this by removing the right motor mount bracket which is held to the crankcase by four 13mm bolts. Once out of the way installing the new motor mount and heat shield was simple. After the new mount was installed and cinched down by the lower nut I reinstalled the engine bracket and 4 bolts using Locktite and following Bentley torque specs. At this point the upper engine mount bolt was already protruding the reinstalled engine mount bracket hole confirming at least to me removing and reinstalling the bracket was the only way to get around this situation.
January 25, 2015
  Followup from the Pelican Staff: Thanks for sharing your installation process and experience. These type of comments add so much to the Pelican tech community. - Nick at Pelican Parts  
ronnie Comments: Is there a motor mount bracket that was missed in this article?
October 9, 2014
  Followup from the Pelican Staff: The bracket attached to crankcase? It was not covered, only the mounts were. - Nick at Pelican Parts  

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