Motor mount bracket failure?

reverseloop · 11-15-2014, 05:09 PM

Alright gentlemen, so I have a 2007 Z4M Roadster. I was driving downtown (known for its crummy roads) and hit a small "lip" in the concrete at about 25MPH.

Immediately after that I noticed a vibration throughout the cabin of the vehicle, which appears to be originating from the passenger side.

After some research I believe this is the result of motor mount bracket bolt failure. I'd like to take a look myself and see if the bolts have indeed broken, so I was hoping someone on here had a diagram, or better yet some pictures, showing the location of all the mounting bracket bolts I should inspect and how to reach them.

I searched the forums and didn't find anything really, so I'm hoping someone could shed some light on what it takes to find and inspect them.
Thanks in advance for any pointers!

***EDIT***

I was searching in the wrong section of the forums. Found a BUNCH of threads on what I need to check this. Disregard post. Mods, remove if necessary!

StickMon · 11-15-2014, 11:41 PM

No prob.
I heard the "motorsports" bolts are in short supply, but somebody recently found identical bolts from McMaster.
You need qty 6 M8x25 and qty 2 M8x35.
I highly recommend Nord-Lock washers, #91812A430. and Vibra-Technics mounts.

reverseloop · 11-19-2014, 05:31 PM

Quote:

Originally Posted by StickMon

No prob.
I heard the "motorsports" bolts are in short supply, but somebody recently found identical bolts from McMaster.
You need qty 6 M8x25 and qty 2 M8x35.
I highly recommend Nord-Lock washers, #91812A430. and Vibra-Technics mounts.

Awesome, thanks for the sizes! Haven't had a chance to even check them yet, just been such a busy week. I appreciate it.

racerbruce · 12-20-2014, 06:38 PM

Wet roads and experienced severe wheel-hop under hard 1st gear acceleration....immediate vibration....drove VERY low-rpm to BMW Bellevue and wheel-hop snapped the right side motor mounts off....required extracting the broken off bolts....it also allowed the engine to move enough to damage the high pressure side power steering hose....inspection revealed the 7 yr old drive belts (both) needed replacement....decided to include a laser alignment as well....voila....a $2,500 experience.

11-15-2014, 05:09 PM	#1
reverseloop Registered 0 Rep 3 Posts Drives: 2007 BMW Z4M Join Date: Nov 2014 Location: Tulsa, Ok iTrader: (0)	Motor mount bracket failure? Alright gentlemen, so I have a 2007 Z4M Roadster. I was driving downtown (known for its crummy roads) and hit a small "lip" in the concrete at about 25MPH. Immediately after that I noticed a vibration throughout the cabin of the vehicle, which appears to be originating from the passenger side. After some research I believe this is the result of motor mount bracket bolt failure. I'd like to take a look myself and see if the bolts have indeed broken, so I was hoping someone on here had a diagram, or better yet some pictures, showing the location of all the mounting bracket bolts I should inspect and how to reach them. I searched the forums and didn't find anything really, so I'm hoping someone could shed some light on what it takes to find and inspect them. Thanks in advance for any pointers! *EDIT* I was searching in the wrong section of the forums. Found a BUNCH of threads on what I need to check this. Disregard post. Mods, remove if necessary! Last edited by reverseloop; 11-15-2014 at 05:30 PM..
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11-15-2014, 11:41 PM	#2
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	No prob. I heard the "motorsports" bolts are in short supply, but somebody recently found identical bolts from McMaster. You need qty 6 M8x25 and qty 2 M8x35. I highly recommend Nord-Lock washers, #91812A430. and Vibra-Technics mounts. __________________ Warning: May contain traces of nuts.
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12-20-2014, 06:38 PM	#4
racerbruce Brigadier General 3852 Rep 3,004 Posts Drives: 21 X3 & 13 335is E93 Join Date: Dec 2009 Location: Seattle iTrader: (1)	Wet roads and experienced severe wheel-hop under hard 1st gear acceleration....immediate vibration....drove VERY low-rpm to BMW Bellevue and wheel-hop snapped the right side motor mounts off....required extracting the broken off bolts....it also allowed the engine to move enough to damage the high pressure side power steering hose....inspection revealed the 7 yr old drive belts (both) needed replacement....decided to include a laser alignment as well....voila....a $2,500 experience. __________________ Racerbruce
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