Parts Catalog Accessories Catalog Tech Info Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Manual Transmission Mount Replacing
 
Bookmark and Share

Pelican Technical Article:

Manual Transmission Mount Replacing

Nick Czerula

Time:

2 hours2 hrs

Tab:

$100

Talent:

****

Tools:

Set of sockets, 13mm, floor jack, wood blocks, 13mm wrench

Applicable Models:

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

Parts Required:

Transmission mounts, nuts for the mounts

Hot Tip:

Replace in sets

Performance Gain:

Smooth driveline

Complementary Modification:

Replace driveshaft flex-disc at the same time

The BMW Z4 drive drain (engine and transmission) is supported by a system of mounts. In the front, the engine rests on two engine mounts; one on each side of the engine. At the rear, the transmission has two small rubber mounts that insulate it from the aluminum support bracket.

These mounts wear over time and cause a driveline vibration. Sometimes if they fail catastrophically, there will be a clunk when accelerating. When inspecting the mounts, look for dry rot and cracking. Engine mounts may be fluid filled, so if you see evidence of fluid leaks near the engine mounts, that may be an indication of engine mount failure. When an engine mount begins to fail, you will feel more vibrations from the engine. The engine may sag in the engine bay or it may have excessive movement under torque if a mount is broken.

Check transmission mounts to see if they have separated by jacking up the transmission. As you jack the transmission, monitor the mounts. They should stretch a little but stay in one piece. When replacing the mounts, I'd suggest replacing the nuts also. You are not required to, but I always feel better about having a new fastener, especially on something that takes as much stress as a mount. It's also not a bad idea to replace your driveshaft flex-disc at the same time. It is also made of rubber. If the mounts are worn out, the flex-disc can't be far behind.

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.

In this article, I'll go over the steps involved with replacing the manual transmission mounts.

The BMW Z4 drive drain (engine and transmission) is supported by a system of mounts.
Figure 1

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 has two small rubber mounts that insulate it from the aluminum support bracket. The two rubber mounts are the same part number, located between the transmission (red arrows) and the aluminum support bracket.

With the exhaust removed, remove the two 10mm nuts (red arrows) on the heat shield to the right of the transmission mount bracket (purple arrow).
Figure 2

With the exhaust removed, remove the two 10mm nuts (red arrows) on the heat shield to the right of the transmission mount bracket (purple arrow).

Working at the rear of the exhaust heat shield (red arrow), remove the two 8mm mounting fasteners (purple arrows).
Figure 3

Working at the rear of the exhaust heat shield (red arrow), remove the two 8mm mounting fasteners (purple arrows).

Next, remove the 10mm nut (red arrow) on the heat shield to the left of the transmission mount bracket.
Figure 4

Next, remove the 10mm nut (red arrow) on the heat shield to the left of the transmission mount bracket.

Working on the left side of the body, remove the two 10mm nuts (red arrows) on the heat shield.
Figure 5

Working on the left side of the body, remove the two 10mm nuts (red arrows) on the heat shield. Then remove the 8mm fastener (purple arrow), remove this fastener on the right side as well. Support the heat shield as you remove the final fastener.

Remove the exhaust heat shield toward the rear of the vehicle (red arrow).
Figure 6

Remove the exhaust heat shield toward the rear of the vehicle (red arrow). Store it in a safe place, do not bend it when removing. Then remove the driveshaft flex-disc. See our tech article on Driveshaft Flex-Disc Replacing.

Place a screw jack or hydraulic jack under the transmission (red arrow).
Figure 7

Place a screw jack or hydraulic jack under the transmission (red arrow). Use a wood block between the jack and the transmission.

Working at the transmission cross member, loosen the two 13mm transmission mount nuts (red arrow).
Figure 8

Working at the transmission cross member, loosen the two 13mm transmission mount nuts (red arrow). When removing, you will need about an 8mm gap (purple arrow) to remove the mounts.

Remove the two 13mm nuts (red arrows).
Figure 9

Remove the two 13mm nuts (red arrows).

Jack the transmission up about 50mm.
Figure 10

Jack the transmission up about 50mm. Then remove the mounts (bottom first) (red arrow) from the transmission. When installing the new mounts, be sure the tab on the mount aligns with the slot in the transmission cross member. What I like to do is, install the mounts with the top fasteners loose. Then slowly lower the transmission as you align the lower studs. Install the nuts and tighten. Assemble the remaining items in the reverse order of removal.

Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Privacy Statement]
 [Contact Us] [About Us] [Shipping] [Map to our Location] [Careers]

Copyright © Pelican Parts Inc.

Page last updated: Mon 12/5/2016 03:02:20 AM