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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Aug-13-2018, 04:34:47 PM   #1
Mindart
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Default Noise from rear of car when off power?

Hey guys... hoping someone here can shed some light on a problem I am having with my car.

When at slow speeds 5-15mph I get a faint clicking/thuding noise from what sounds like the rear of the car.

I have found what replicates it is when I am off power either with the clutch in coming to a stop ( not on brakes though) or the trans in neutral. I have also got it to happen by putting clutch in to disengage the drive train from the motor and then placing trans in neutral and then letting the clutch back out and the noise is still there. ( so basically whether clutch is engaged or disengaged makes no difference)

FWIW I have changed the flex disc and the CSB recently all genuine... and yes i did pre load the CSB.

Again, this noise is only replicated when I am off power and am rolling at slow speeds NOT under load. In fact when i have first or second engaged and am going very slow I cannot hear the noise from the rear.

It certainly sounds like something associated with rotation and increases or decreases with the speed of the car... most prevalent at low speeds whether going in a straight line or around a corner. I did jack the rear up and looked underneath, don't see anything odd. I also tried to wiggle the wheels back and for for play in the hubs.... seems fine


Wheel bearing? something with the diff?

( sorry for lengthy post )

Last edited by Mindart; Mon, Aug-13-2018 at 04:51:58 PM.
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Old Mon, Aug-13-2018, 07:02:37 PM   #2
Texaz3
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Default Re: Noise from rear of car when off power?

Congrats, I believe you have discovered the famous M-driveline clunk!
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Old Mon, Aug-13-2018, 07:16:59 PM   #3
Mindart
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Default Re: Noise from rear of car when off power?

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Originally Posted by Texaz3 View Post
Congrats, I believe you have discovered the famous M-driveline clunk!
I was under the impression the "M clunk" was only when you were getting on power... eg... from a dead stop take off to first OR going from a stop in reverse... My old M3/4 did that
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Old Mon, Aug-13-2018, 08:48:46 PM   #4
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Default Re: Noise from rear of car when off power?

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Originally Posted by Mindart View Post
I was under the impression the "M clunk" was only when you were getting on power... eg... from a dead stop take off to first OR going from a stop in reverse... My old M3/4 did that
He's thinking of the wrong car. A properly maintained E36 M3 does not have the E46 M3 passenger side stubby differential output shaft clunk.

Did you make any other changes while doing that work? Brake dust shields hitting? Differential bushings in good shape and the bolts tight? The lower bolt is known to loosen and break. Heat shield hitting the drive shaft?

Get the car up in the air and start moving the wheels/shaft to better isolate where.
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Old Mon, Aug-13-2018, 09:08:13 PM   #5
Mindart
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Default Re: Noise from rear of car when off power?

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Originally Posted by Braymond141 View Post
He's thinking of the wrong car. A properly maintained E36 M3 does not have the E46 M3 passenger side stubby differential output shaft clunk.

Did you make any other changes while doing that work? Brake dust shields hitting? Differential bushings in good shape and the bolts tight? The lower bolt is known to loosen and break. Heat shield hitting the drive shaft?

Get the car up in the air and start moving the wheels/shaft to better isolate where.
I did the rear sway bar end links... i remember seeing the diff bolt bushing was beginning to from a very slight crack but figured Iíd change it out down the road. As i donít drive the car very hard. The bushing only comes into play when you are under load though correct? This noise is when we are not under load. Just coasting at slow speeds

I will have to get her up on all four this weekend and do the diff fluid as i have been meaning to do it. I guess at that point Iíll check for play or anything interfering with a rotating assembly
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Old Mon, Aug-13-2018, 09:52:11 PM   #6
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Default Re: Noise from rear of car when off power?

What sway end links did you use?
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Old Mon, Aug-13-2018, 11:48:28 PM   #7
Mindart
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Default Re: Noise from rear of car when off power?

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What sway end links did you use?

Lemforder
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Old Sat, Aug-18-2018, 03:17:53 AM   #8
Mindart
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Default Re: Noise from rear of car when off power?

Update.

Got under there The drive shaft might have less than 1mm play in drive shaft u joints... guibo bolts are tight . Maybe some very very slight rotational play between the axel and cv joint?

Drained diff oil. And i am seeing very fine metallic dust in there. To the point where if you move the oil around you see tracers of the waves of oil. Also when moving oil to side of drain pan i can confirm very small metal flakes

Clearly not normal but causing he rotational knocking noise?

Any more thoughts out there
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Old Mon, Aug-20-2018, 02:41:24 AM   #9
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Default Re: Noise from rear of car when off power?

Rear diff bushings, or maybe the pilot bearing is noisy, inside the clutch assembly.
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Old Mon, Aug-20-2018, 06:15:04 AM   #10
Mindart
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Default Re: Noise from rear of car when off power?

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Originally Posted by Bmwpower603 View Post
Rear diff bushings, or maybe the pilot bearing is noisy, inside the clutch assembly.
99 percent sure there should be no metal flecks in my diff fluid.....something is or is about to fail there
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Discussing Are there any steering shaft extensions (cabin side) to get the wheel towards driver? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)