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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 universal), hydraulic jack, block of wood

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

Parts Required:

Motor mounts and locking nuts

Hot Tip:

Replace in pairs

Performance Gain:

Reduce engine vibration

Complementary Modification:

Replace transmission mounts

The BMW Z4 drive drain (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 support crossbeam 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. 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 Z4. A Z4M with an S54 6-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 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. 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.

Start by removing the intake air housing and duct.
Figure 1

Start by removing the intake air housing and duct. See our tech article on intake air housing removal. Working in engine bay, locate top of motor mount. Left side engine mount shown in this photo looking past the intake manifold. Remove the 16mm nut from motor mount (red arrows). 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 exhaust manifold, remove the secondary air pipe if it obstructs access. Remove the 16mm nut from motor mount (red arrows). This is a locking nut, be sure to replace it.

For right side mount.
Figure 3

For right side mount. Working below the right side of the engine at sub frame, remove lower engine mount 16mm nut (red arrow). Note the hole in the subframe bracket (blue arrow). There is a tab on the engine mount that faces forward, it will not be in the rear hole shown. Next, loosen the engine mount nut on opposite side of engine mount you are replacing, do not remove nut. Doing this allows the engine to be raised enough to remove engine mount on opposite side of engine. Left side mount shown in photo.

For left side mount.
Figure 4

For left side mount. Working below the left side of the engine at sub frame, remove lower engine mount 16mm nut (red arrow). Note the hole in the subframe bracket (blue arrow). There is a tab on the engine mount that faces forward, it will not be in the rear hole shown. Next, loosen the engine mount nut on opposite side of engine mount you are replacing, do not remove nut. Doing this allows the engine to be raised enough to remove engine mount on opposite side of engine. Left side mount shown in photo.

Next, support engine from below using hydraulic jack.
Figure 5

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

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 (red arrow). Remove engine mount from vehicle.

Push mount up until lower stud clears subframe bracket, then remove bottom first toward rear of vehicle (red arrow).
Figure 7

Push mount up until lower stud clears subframe bracket, then remove bottom first toward rear of vehicle (red arrow). 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 tighten. 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 the remaining items and recheck that all engine mount nuts are tight.

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Page last updated: Wed 12/7/2016 03:02:06 AM