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E85 3.0si drivetrain noises
- saseinlinie
- Newbie
- Posts: 44
- Joined: Tue Aug 29, 2017 10:26 am
E85 3.0si drivetrain noises
Hi guys and girls. Just wanted to check with other owners if the below noises are normal. This is my first BMW(2006 E85 3.0si), and it had been sitting for more than a year before I brought it back to life.
1. There is a clunk from the rear when getting on/off the accelerator. I try it in first gear, really low speed, in the garage, and I can definitely hear a clunk when i touch the accelerator pedal, a mechanical noise of something engaging (diff?). I never touch the clutch, just accel. on/off. I hear the sound when I slightly press the accel. and when I take the foot of it again. Happens at higher speeds too, but not so easy to hear because of other noises(tyres, wind).
2. At usual speeds (anything from city speed limit to highway), in gear, there is a mechanical rumbling, again when coming off the accelerator, in gear. Doesn't manifest when keeping constant acceleration, only when taking the foot off the accel., with the car in gear(clutch pedal not pressed).
Thanks.
1. There is a clunk from the rear when getting on/off the accelerator. I try it in first gear, really low speed, in the garage, and I can definitely hear a clunk when i touch the accelerator pedal, a mechanical noise of something engaging (diff?). I never touch the clutch, just accel. on/off. I hear the sound when I slightly press the accel. and when I take the foot of it again. Happens at higher speeds too, but not so easy to hear because of other noises(tyres, wind).
2. At usual speeds (anything from city speed limit to highway), in gear, there is a mechanical rumbling, again when coming off the accelerator, in gear. Doesn't manifest when keeping constant acceleration, only when taking the foot off the accel., with the car in gear(clutch pedal not pressed).
Thanks.
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- Member
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- Location: Newbury, Berks UK
E85 3.0si drivetrain noises
Issue 1 sounds like the common issue of the propshaft joint needing re-greasing. I've not yet done this on my car but I'm sure someone else will be along shortly with detailed instructions!
Chris
Chris
08 Z4 3.0si Sport Coupe in Montego Blue
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- Lifer
- Posts: 4621
- Joined: Fri Dec 31, 2010 9:38 pm
E85 3.0si drivetrain noises
as above, dry prop joint. Mine does it but i cant be arsed sorting it
18 Z4s owned to date.
Current: 2.5i Titan silver
Daily driver: 480bhp M140i Shadow edition.
Current: 2.5i Titan silver
Daily driver: 480bhp M140i Shadow edition.
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- Member
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- Joined: Wed Apr 05, 2017 11:39 am
E85 3.0si drivetrain noises
As already highlighted point 1 is a common problem... did a quick search and this thread came up which may help with these issues?
viewtopic.php?t=20865
Point 2 sounds like a prop support bearing to me, or it could even be the Prop shaft coupling between the gearbox and the prop.... just a guess but that's where I'd start looking!
http://www.realoem.com/bmw/enUS/showpar ... Id=26_0217
viewtopic.php?t=20865
Point 2 sounds like a prop support bearing to me, or it could even be the Prop shaft coupling between the gearbox and the prop.... just a guess but that's where I'd start looking!
http://www.realoem.com/bmw/enUS/showpar ... Id=26_0217
E86 Coupe 3.0si Sport - Montego Blue, Pearl Grey with Piano Black dash
BC BR series Coilovers, powerflex bushes, 15mm spacers, Custom SS exhaust, CDV delete
BC BR series Coilovers, powerflex bushes, 15mm spacers, Custom SS exhaust, CDV delete
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- Lifer
- Posts: 4621
- Joined: Fri Dec 31, 2010 9:38 pm
E85 3.0si drivetrain noises
just done some research on it, i found this statement from the guy on here who did the job himself
'The thing is this happens long before anyone would expect worn diff parts. The problem is the seal isn't very effective and is exposed to constant water spray, so the grease gets flushed out prematurely. The procedure simply replaces the lost grease. The symptomatic clunking is caused by the end of the output flange banging against the inner diff housing. There's no real pressure involved, so wear caused from ignoring it isn't a huge issue, but it's really annoying!'
which is a good enough statement for me not to piss about with it
'The thing is this happens long before anyone would expect worn diff parts. The problem is the seal isn't very effective and is exposed to constant water spray, so the grease gets flushed out prematurely. The procedure simply replaces the lost grease. The symptomatic clunking is caused by the end of the output flange banging against the inner diff housing. There's no real pressure involved, so wear caused from ignoring it isn't a huge issue, but it's really annoying!'
which is a good enough statement for me not to piss about with it
18 Z4s owned to date.
Current: 2.5i Titan silver
Daily driver: 480bhp M140i Shadow edition.
Current: 2.5i Titan silver
Daily driver: 480bhp M140i Shadow edition.
- saseinlinie
- Newbie
- Posts: 44
- Joined: Tue Aug 29, 2017 10:26 am
E85 3.0si drivetrain noises
Great info guys, and the parts don't look expensive, I'll prob get the greasing done and the bearings replaced when i do the oil change in spring, since it's not something I can do myself. For this year the Z4 season is almost over.
- Crazy Harry
- Senior Member
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- Joined: Fri Jan 13, 2017 12:32 pm
- Location: Breckland Norfolk
E85 3.0si drivetrain noises
For some of us the seasons never over! Get the top off - loads of clear dry days over autumn and winter. Fleece on, heater on (and heated seats) and if you must a hat on and enjoy the roads. But it is my daily driver
- saseinlinie
- Newbie
- Posts: 44
- Joined: Tue Aug 29, 2017 10:26 am
E85 3.0si drivetrain noises
sure except here winter tyres are mandatory by law starting november...so until spring I will probably only put about 500km on the car, doing an uninsured warm-up drive every few days to keep everything lubricated
- ph001
- Lifer
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- Location: N. Yorkshire.
E85 3.0si drivetrain noises
Agreed. Those cold crisp ultra clear days in winter are amazing with the top down and the right clothing on.
- bradz
- Member
- Posts: 455
- Joined: Thu Jul 11, 2013 6:26 pm
- Location: Bedford
E85 3.0si drivetrain noises
First this I would check is the rubber doughnut on end of gearbox - About £20
Adam
Adam
Z4M Coupe, E92 M3, E46 M3 Track car
- saseinlinie
- Newbie
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E85 3.0si drivetrain noises
Thanks Adam, I will research on this doughnut what does it do ?
LE: I think it's also called prop/drive shaft joint
https://blog.bavauto.com/14113/bmw-how- ... isc-giubo/
LE: I think it's also called prop/drive shaft joint
https://blog.bavauto.com/14113/bmw-how- ... isc-giubo/
- bradz
- Member
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- Joined: Thu Jul 11, 2013 6:26 pm
- Location: Bedford
E85 3.0si drivetrain noises
That's the one.
When they are worn they become loose and there can be play in the drivetrain.
I changed mine at 75k and it was in pretty bad condition.
When they are worn they become loose and there can be play in the drivetrain.
I changed mine at 75k and it was in pretty bad condition.
Z4M Coupe, E92 M3, E46 M3 Track car