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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Manual gearbox / driveline issue shunt or knocking help.



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      02-26-2018, 05:24 PM   #1
ChawenHalo
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Manual gearbox / driveline issue shunt or knocking help.

Hi fellas.
I've recently just started to get a slight rattle (sort of clonk-clonk-clonk) when coming off throttle at lower speeds (roundabouts, junctions, parkings) especially when there is a slight gradient. I can hear it from the gearbox area and feel it very slightly on the gear stick.

Although I sometimes get a crunch from 1st to 2nd when the car is cold, I'm not sure its the gearbox's fault as it makes no difference if I've depressed the clutch or not and it won't do it at higher speed / heal and toeing etc. This makes me think that it could be down to the drive line and prop shaft thingies (and this something I know peanuts about. The thing is when I last had this knocking off throttle it was on a proper sports coupe and a serious chassis. It also did it all the time and came from the back off the car not the centre / gearbox area.

Bearing in mind my car is XDrive (although I doubt it has anything to do with it) Any ideas?
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      02-27-2018, 02:10 AM   #2
rasa bmw
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flex disc/centre bearing..deffo sounds like one or both of them,,and if you get gearstick shake that would deffo be the centre bearing..ive had it before couple of years ago..and only last month changd the flex disc/new bolts also..thats on my e46..my e90 is fine
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      02-27-2018, 07:06 AM   #3
ChawenHalo
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Quote:
Originally Posted by rasa bmw View Post
flex disc/centre bearing..deffo sounds like one or both of them,,and if you get gearstick shake that would deffo be the centre bearing..ive had it before couple of years ago..and only last month changd the flex disc/new bolts also..thats on my e46..my e90 is fine
Cheers. That does not sound too bad. I think over here they call it a "Flector" and its a 120 part + I imagine about 200 to install...:

Odd that sort of thing should fail so soon, the car only has 140 000 km / 88k miles...

Will get the X Drive checked at the same time. Anyone knowledgeable on what to lookout for?
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      02-27-2018, 06:08 PM   #4
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On my E46 i went though a prop donut every 40k miles!
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      03-01-2018, 04:44 AM   #5
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If I said giubo disc, is that what we are talking about here?
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      03-01-2018, 05:00 AM   #6
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Quote:
Originally Posted by blueh88 View Post
If I said giubo disc, is that what we are talking about here?
Yup.
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      03-02-2018, 02:04 PM   #7
ChawenHalo
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Driving around today symptom is getting worse. On slight uphill and sometimes flat ground as a knock-knock-knock type rattle from behind the gearbox are as soon as I take off my foot of the gaz at low speeds. BMW are taking a look 1st thing Monday morning to see if it something serious. Will report back.
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      03-07-2018, 01:22 PM   #8
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I might add that my car is starting too pi$$ me off... I'd like to get to the end of mechanical gubins to start to upgrade. Never had such a problem child of car. Rant over
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      03-08-2018, 07:26 AM   #9
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Did BMW find out what was causing the knocking sound?
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      03-08-2018, 12:45 PM   #10
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Quote:
Originally Posted by bishbosh View Post
Did BMW find out what was causing the knocking sound?
Yep, just had a test drive with one of their Tech fellas. He reckons its the transfer case starting to go. As to why this is only noticeable when slowing down is beyond me tbh...

I had read many moons ago about all the bull$hit about having exactly the same tyres thread all round (something he actually did re-iterate) and the need to change all 4 tyres on Xdrive cars. Given that BMW offers (on M pack for example) staggered wheel options (wider at the back) on their Xdrive cars means its complete nonsense and they're just covering their asses for a poor quality transfer case. To be fair though this problem is common also to all non real 4x4 (like Pajeros/ Shoguns; Toys; Subarus etc.) of the like Audi and Mercedes.

Interestingly he told me that during training they told their staff that these transfer cases do not live past 120000 km which seems to confirm plenty of litterweb stories.

From memory its just a case of the actuator motor rather than the entire transfer case but I have a lot more digging to do. I did however mention it to him and he smiled and said that a customer had showed him a video and that you could get the part on German Ebay. Fair cop me says. From what I remember its a 200 part and about 20 mins (1 hr if your a mechanic newby like me) work.

If anyone's got any advice / experience with X-Drive, it would be welcomed!

1. Is xdrive on LCI same and pre-LCI?
2. Just the tranfer case actuator motor/ could it be something else?

And I arrest my case: This car is really starting to pi$$ me off, majorly
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