BimmerFest BMW Forum banner
1 - 15 of 15 Posts

·
BMW Rookie
Joined
·
161 Posts
Discussion Starter · #1 ·
A couple weeks ago I took a trip on the 6er from Tempe, AZ. to the bay area stopping at three different beaches. On my way back home, just 40 miles before getting home, I noticed an intermediate clacking noise. I stopped my a gas station and gave it a visual inspection, and thought it was just part of the inner fender plastic slapping the tire. The 6ers performance, and ride felt the same, and the noise only came when i released the throttle so i didnt think much of it.

In town I could hear the noise more since I would roughly drive between 25-45mph. and again the noise would only appear when the throttle was released or no power to the peddle.

I decided to lift the 6er on jack stands and put it on Drive, of course traction control disabled. I noticed that every thing on the rear suspension was intact and normal. I did feel that clacking noise close to the differential when i i laid my hand on back of the diff. So now I am thinking that it might be the Differential or the Ujoint in front of the diff/ Carrier.


My question is; is it common on 6ers for the Differential to go bad, and what swap can i do? Has any one ran across rear end problems?:confused: on 6ers
 

·
Registered
Joined
·
681 Posts
normally if it would be the u joint,it would make noise under load,your problem is reverse could it be sand or dirt in the rotors maybe,ive had dirt in my rotors before and it was shaking the whole car.
 

·
Freude am Fahren
Joined
·
4,292 Posts
A couple weeks ago I took a trip on the 6er from Tempe, AZ. to the bay area stopping at three different beaches. On my way back home, just 40 miles before getting home, I noticed an intermediate clacking noise. I stopped my a gas station and gave it a visual inspection, and thought it was just part of the inner fender plastic slapping the tire. The 6ers performance, and ride felt the same, and the noise only came when i released the throttle so i didnt think much of it.

In town I could hear the noise more since I would roughly drive between 25-45mph. and again the noise would only appear when the throttle was released or no power to the peddle.

I decided to lift the 6er on jack stands and put it on Drive, of course traction control disabled. I noticed that every thing on the rear suspension was intact and normal. I did feel that clacking noise close to the differential when i i laid my hand on back of the diff. So now I am thinking that it might be the Differential or the Ujoint in front of the diff/ Carrier.

My question is; is it common on 6ers for the Differential to go bad, and what swap can i do? Has any one ran across rear end problems?:confused: on 6ers
How many miles are on the car? I've not heard of one differential going bad on a 650i yet. It is most likely that the guibo(flex disc) that connects to the driveshaft may be going bad.

Have an independent specialist look at the car so that you do not need to waste money on replacing unnecessary parts.
 

·
BMW Rookie
Joined
·
161 Posts
Discussion Starter · #4 ·
Believe me I never spend money on parts by guessing, LoL. I was just asking if its a known problem before I went further. I'm assuming that it could be the flex disk/ u joint since the carrier mount bushings seem to be worn. OK thanks for your guys replies, I am going to drop the drive line an carrier and go from there. I've done independent and straight axles before but not familiar with BMW.
 

·
BMW Rookie
Joined
·
161 Posts
Discussion Starter · #6 ·
is this what you are talking about, or this
Haven't had time to mess with it but i really need to before the Coding meet.

THnx again guys..
 

·
Super Moderator
Joined
·
9,202 Posts
One of the 2 above should be your problem. The Guilbo joint is a common failure, & usually gives the jerk between zero load & applying load. The 1st to 2nd jerk. If the center bearing is going bad, you could listen to it with a screwdriver, broom stick, or stethoscope. If the bearing is failing, you will hear the grinding noise. You will need to be under the car, while someone applies the throttle, in gear.
 

·
BMW Rookie
Joined
·
161 Posts
Discussion Starter · #10 ·
UPDATE: If anyone runs through the same problem or situation, this could be the problem. Initially I though that this was the problem but many people suggested that it was rubber joint or the CV joint.

In my case it was the pin that holds both spur/ spider gears in place. I have no Idea how that could of broken...LoL:rofl: I am assuming it was my aggression driving + neglecting replacing the gear oil on time or the previous owner never replaced it properly.
 

Attachments

·
Freude am Fahren
Joined
·
4,292 Posts
UPDATE: If anyone runs through the same problem or situation, this could be the problem. Initially I though that this was the problem but many people suggested that it was rubber joint or the CV joint.

In my case it was the pin that holds both spur/ spider gears in place. I have no Idea how that could of broken...LoL:rofl: I am assuming it was my aggression driving + neglecting replacing the gear oil on time or the previous owner never replaced it properly.
That is the differential, correct?

If so, that sucks. I'm glad that I just changed out the differential fluid on my car.
 

·
BMW Rookie
Joined
·
161 Posts
Discussion Starter · #12 ·
Yes it is the Differential/ rear carrier/ axle. 6-8 hour job (all day) to start and finish the job.
 
1 - 15 of 15 Posts
Top