Advise please.. Potential diff/bush issue

General E30 related discussions -
Please put technical questions in E30 Tech Help forum below

Moderator: martauto

User avatar
Bh94
E30 Zone Newbie
E30 Zone Newbie
Posts: 22
Joined: Thu Jul 31, 2014 11:00 pm

Post Thu Jan 21, 2016 4:25 pm

Hi,

I have a 325i sport and have owned it for 1.5yrs since I've had the car I've noticed increasing noises of clunking/rubbing noises coming from the rear of the car when turning tightly at low speeds.

First initial thoughts are that it could be diff related/ bushes?

I also have a wurring like noise from the back also at speeds 50mph+ which loudens when I come off the accelerator and slow down. Any idea if these two things could be related and what could be the cause? Any advise appreciated

many thanks in advance
User avatar
pianist
E30 Zone Regular
E30 Zone Regular
Posts: 396
Joined: Mon Mar 12, 2012 11:00 pm
Location: Lancashire

Post Thu Jan 21, 2016 6:49 pm

Is it vibrating under acceleration? Usually diff starts whining under acceleration and engine braking if it was dry for a long time. Anyway it is hard to tell from your description but the clanging noise could be diff bush, main cross bar bushes or center bearing.

Maybe someone on here had similar thing and clear it for us
HairyScreech
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6265
Joined: Sun Jan 21, 2007 11:00 pm

Post Thu Jan 21, 2016 7:25 pm

Drifting or abuse in the past?

the whurring on decell only is a sign of bad things in the diff, get someone with a 2 post lift that can get it off the ground and take a look with the car in gear at idle, watch the diff outputs for abnormal rotation.

Mine was doing exactly this and it was the cross pin in the diff loose in its carrier, forced into position under load but chattering when unloaded.
2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822

m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
User avatar
Bh94
E30 Zone Newbie
E30 Zone Newbie
Posts: 22
Joined: Thu Jul 31, 2014 11:00 pm

Post Fri Jan 22, 2016 11:24 am

HairyScreech wrote:Drifting or abuse in the past?

the whurring on decell only is a sign of bad things in the diff, get someone with a 2 post lift that can get it off the ground and take a look with the car in gear at idle, watch the diff outputs for abnormal rotation.

Mine was doing exactly this and it was the cross pin in the diff loose in its carrier, forced into position under load but chattering when unloaded.
Ok thanks both, I'll get looking into the diff in that case.
HairyScreech
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6265
Joined: Sun Jan 21, 2007 11:00 pm

Post Fri Jan 22, 2016 1:36 pm

2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822

m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&