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BMW Engine Mount Replacement
 
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Pelican Technical Article:

BMW Engine Mount Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

****

Tools:

Set of sockets, (8mm, 10mm, 16mm E12), hydraulic jack or engine hoist, block of wood

Applicable Models:

BMW 325i Sedan (2006)
BMW 325xi Sedan/Wagon (2006)
BMW 328i Coupe/Conv (2007-13)
BMW 328i xDrive Coupe (2009-13)
BMW 328i xDrive Sedan (2009-11)
BMW 328i xDrive Wagon (2009-12)
BMW 328i/xi Sedan (2007-11)
BMW 328i/xi Wagon (2007-12)
BMW 328xi Coupe (2007-13)
BMW 330i/xi Sedan (2006)
BMW 335d/i/xi Sedan (2007-11)
BMW 335i xDrive Coupe (2009-13)
BMW 335i xDrive Sedan (2009-11)
BMW 335i/is Coupe/Conv (2007-13)
BMW 335xi Coupe (2007-13)

Parts Required:

Motor mounts and fasteners

Hot Tip:

Replace in pairs

Performance Gain:

Reduce engine vibration

Complementary Modification:

Replace transmission mount

When an engine mount begins to fail, you will feel more vibrations from the engine. If a mount is broken, the engine may sag (sit lower in the engine compartment) or have excessive movement under torque. When working under your vehicle, you may notice fluid that appears to be leaking out of your engine mount. The mounts are filled with a hydraulic fluid. 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 engine from below.

In this article, I'll go over the steps involved with replacing the engine mounts on the BMW E90 models.

Remove engine splash shields and reinforcement brace. See our tech article engine splash shields removing.

Note: The following steps highlight how to remove the upper engine mount nuts. Only remove the side you are currently replacing. Do one side at a time. This ensures your engine will remain centered in the engine compartment and make it easier to align the new engine mounts.

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

Working in engine bay, locate top of left side motor mount. Looking down past strut tower, find the steering shaft universal joint, the motor mount is right below it. This photo shows the orientation of the steering shaft universal joint (yellow arrow) and the motor mount (green arrow).

Using a 24
Figure 2

Using a 24" extension, (or a few extensions connected together) remove nut from motor mount. You will have to slide extension down past steering shaft knuckle and guide it onto nut. Once on, break the nut free and remove. This photo shows the extension placement in engine compartment. (green arrow)

Working in engine bay, locate top right side of motor mount.
Figure 3

Working in engine bay, locate top right side of motor mount. Right side engine mount shown in this photo, looking down past exhaust manifold.(yellow arrow) Remove nut from motor mount. (green arrow)

When replacing left side engine mount, remove wheel well corner trim cover.
Figure 4

When replacing left side engine mount, remove wheel well corner trim cover. Remove three 8mm fasteners (green arrows), then one 10mm plastic nut (yellow arrow).

Note: The following steps highlight the removing the right side engine mount.
Figure 5

When replacing left side engine mount, remove six 16mm fasteners from lower cross brace and remove reinforcement brace (green arrow) from vehicle Note: The following steps highlight the removing the right side engine mount. Procedure is similar for left side, difference will be noted. You do not have to remove the lower reinforcement brace when replacing the right side engine mount.

Figure 6

Working below engine at subframe, remove two E12 lower engine mount fasteners (green arrows)

Next, support engine from below using hydraulic jack.
Figure 7

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

Jack engine until engine mount can be removed from vehicle.
Figure 8

Jack 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. 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 engine mount nut torque.

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Comments and Suggestions:
Jo Comments: Is there a write up for the S65 M3 engines
August 28, 2015
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
WESK1 Comments: Nice, I needed this tutorial a while back but still good to know how is done. Now how to replace the Front axle supportsubframe? Mine has a crack on the left side not sure how deep and I wonder if that's the cause of vibrations on high speeds and alignment to be off, engine mounts and control arms are replaced.
April 13, 2015
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Daniel Comments: I have a 2006 BMW 530i N52, could you please tell me if the exact DIY procedures that Nick provided can be applied for my car? Or do I have to remove the support brackets, coolant reservoir and other parts to complete the job?

Thank you in advance for your help!

Daniel
January 17, 2015
  Followup from the Pelican Staff: This article should work for your vehicle. If you think it doesn't look right, I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Kommodore Comments: After reading a lot of mis-information and horror stories about this process Not by Pelican Parts I want to clarify how this can be done quickly on a 335i.

I did this in 3.5 hours taking breaks using a lift and a High Reach Jack.

1. Remove intake and undo Drive-Side Top Bolt for the mount.
2. Lift car, remove under tray. Undo the 10mm bolt on the passenger side of the steering rack, and loosen the bolt on the driver side that also secures the rack to the subframe. Also, un-do the passenger side tie-rod end. This allows you to push the steering rack on the passenger side forward, and you can easily remove the heat shield which gives you access to the passenger side mount.

3. Remove intercooler


4. Undo the top bolt on the passenger side mount, but don't take it completely off. Give it enough room for the engine to rise.

5. Un-do the bottom bolts of the driver side mount. Some people indicate that the black support bar needs to be removed. But, I was able to undo the bolts using a small 1/4 inch 10mm ratchet, it fit right inside.

6. Using a piece of wood and the high-reach jack, I lifted the engine by the oil pan. It lifted the driver side mount arm high enough to remove the mount. Looking towards the front of the car, you should be able to reach in from the firewall side of the subframe to almost pull the mount out. It will be blocked by the black metal bracket that protects the fuel lines. Simply lower the engine slightly, since the oil pan is canted over to the passenger side it will reveal enough space after lowering for you to then pull out the driver side mount. When you put the new one in, of course you will need to raise the engine once more before positioning it into place.

7. Lower the engine onto its new driver side mount, and thread the 16mm bolt to the top slightly, and secure the bottom bolts to the subframe as well.

8. Towards the front of the engine, right above the power steering lines, in front of the steering rack, you can maneuver a piece of wood under the front flat part of the oil pan. This is where we will lift the N54 to clear the passenger side mount. Undo the passenger side top 16mm bolt and raise the engine, replace the passenger side mount. With the heat shield out of the way, you should have plenty of room.

*note that you do not have to worry about un-doing the exhaust or transmission mounts, or anything. There should be plenty of give, the motor only has to come up about an inch and a half.

That's it!
September 20, 2014
  Followup from the Pelican Staff: WHOA!

Thanks a ton for adding this info to our tech article. We appreciate insight like this. - Nick at Pelican Parts
 
Coops Comments: Good information. I have removed the RHS engine support bracket and mount to remove rear turbo on my BMW335i. Can you provide the torque specs for the bolts holding the support bracket to the engine block, the mount to the support bracket and the mount to the chassis.
August 26, 2014
  Followup from the Pelican Staff: I don't have the torque specs handy. I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Ferg Comments: Nick,

How do I get the mount out once I loosen all the bolts, there is zero wiggle room. Thank you.
February 10, 2014
  Followup from the Pelican Staff: you have to jack the engine. Either from above with an engine support (my preferred method), or from below with a jack. Be sure to loosen the opposite side mount to maximum movement. - Nick at Pelican Parts  
Ferg Comments: How are you able to access the motor mount, more importantly remove it on an XI model E92. I cannot see any wiggle room to get the mount out without removing the front drive axle. Any help would be appreicated.
February 4, 2014
  Followup from the Pelican Staff: On Xi models, you will want to access the top nut from below. Use an open end wrench. - Nick at Pelican Parts  
Boom Comments: I have an '07 e93 335i with an n54 twin turbo. The down pipes and front mount inter cooler seem to be complications over the n52. There is also a black metal bracket the shields the fuel lines on the driver side base of the firewall the must be removed to get the mount out. It's held in place by three 10 mm nuts.
January 4, 2014
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
boom Comments: Found that I had pulled the intercooler coupler out when lifting the engine. Another step about disconnecting the intercooler needs to be added.
January 1, 2014
  Followup from the Pelican Staff:
Thanks for the input on this one. We appreciate the help. - Nick at Pelican Parts
 
boom Comments: This job took me 8 hours. Granted I was on jackstands.

1. you must disconnect the trans mounts to get the engine to move enough to clear the engine mount on the driver's side.
2. you have to disconnect the cat-back exhaust to get the engine to move enough on the passenger side.
3. I had to remove the downpipes to get the clearance necessary to remove the passenger side mount as they were contacting the firewall and not letting the engine move.

I spent hours trying different jack points on the engine to get it to move enough - again I was on jackstands so this was MUCH harder than on a lift.

In any case unless you're a professional mechanic, there is no way you're getting this done in 2 hours as described. I'm by no means a pro, but I've done more downpipes, intercoolers, intakes, and suspension on BMWs, VWs, and Mazdas than I can count. I'm not inexperienced.
December 30, 2013
  Followup from the Pelican Staff:
Thanks for the input on this one. We appreciate the help. - Nick at Pelican Parts
 
boom Comments: Been at this for a couple of hours now. Both mount nuts are loosened/removed and the engine will not move enough to get the mount out. I've tried numerous points on the oil pan trying to get the engine to move more. Nothing works. I can get about centimeter of lift but that is not enough to remove the mount.
December 30, 2013
  Followup from the Pelican Staff: What model do you h ave? If the engine won't move, try removing a trans mount bolt. Usually when I perform this repair it is as described above. However, if additional clearance is needed you will have to remove anything preventing the engine from rising. - Nick at Pelican Parts  
boom Comments: Great write up. Thank you. Can you provide the torque specs for the bolts that hold the mounts to the chassis?
December 29, 2013
  Followup from the Pelican Staff: Engine mount to engine support arm M10 10.9 56 Nm

Engine mount to front axle support M10 38 Nm, M8 10.9 28 Nm - Nick at Pelican Parts
 

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