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Discussion Starter #1
Hi all,

So I was taking my e92 320d M Sport for a nice spirited Sunday drive down some country lanes earlier today when I noticed a clinking/whining/grinding noise in 6th gear, I was doing around 60 at the time and it seemed to be speed dependant as to how loud it got. Once I realised that the noise seemed to be in connection with the gear, I dipped the clutch which made the noise go away, I then gave it a couple of throttle taps and again, no noise.

By this time I was pretty certain it was my 6th gear dying. I changed down into 5th gear and accelerated and no noise! Slowed down a bit more, dropped into 4th and BOOM! The noise was back! I pulled off in 4th and got the same grinding noise but slightly quieter than 6th.

Now I'm starting to get a bit concerned, I pulled over and went through the full range. 1st... no noise, 2nd... no noise, 3rd... slight noise but no where near as bad, 4th... grinding noise coming from the shifter and vibrations coming through, 5th... no noise, 6th... horrendously loud grinding noise and vibrating in the shifter.

My first thought is that its my gearbox dying a very slow, painful and extremely loud death. However, I've since spoken with a few people who have advised that this could be relating to other transmission issues such as the flywheel, loose mounts, timing chain or clutch issues. The noise itself is coming direct from the shifter, the vibrations can be felt through the shifter, along the center tunnel and also in the clutch if dipped very slightly.

Any idea's if this is likely to be the timing chain or more likely to be be the gearbox on it's way out?

Any help is MASSIVELY appreciated!
 

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It's either low on oil or you have a bearing going had inside...the 4,5,6th gear is high inside the transmission and is mounted together on a shaft...if your oil is low it's not getting the proper oil it needs it will make noise.....remove the fill plug and put your small finger in and see if you touch oil....full is when it level with the fill hole

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Also look for where the oil went if it's low...most commonly it's the input shaft by the clutch...second is output shaft

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Discussion Starter #4
It's either low on oil or you have a bearing going had inside...the 4,5,6th gear is high inside the transmission and is mounted together on a shaft...if your oil is low it's not getting the proper oil it needs it will make noise.....remove the fill plug and put your small finger in and see if you touch oil....full is when it level with the fill hole

Sent from my LG-H901 using Tapatalk
Thank's Saii1!

I'm going to check the gearbox oil tomorrow all being well! bit skeptical of it being the oil due to it only being 3rd, 4th and 6th. 5th is extremely smooth so this is throwing doubt in my mind on it being something simple :(

When you say bearing, any bearing's specifically or known for going?

Thanks for the help!
 

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Input shaft bearing is the most stressed because of its location and the forces it's subject to, If the upper rack bearings are not in oil it could make a whining noise not to mention what might be happening to the gears but they won't last long like that before permanent damage is done. Thoes bearings are the most sensitive because there the highest ones in the transmission and the first ones out of oil. Now don't get me wrong here being low on oil won't hurt them to a point....oil sling still get oil to them but when it gets to low then there's a problem.

Automatic transmissions you know when there low...they will slip and you get a light on the dash but manual transmissions you could blow a seal and loose 70% of your oil and never know for miles or till it's usually to late

Sent from my LG-H901 using Tapatalk
 

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Discussion Starter #6
Input shaft bearing is the most stressed because of its location and the forces it's subject to, If the upper rack bearings are not in oil it could make a whining noise not to mention what might be happening to the gears but they won't last long like that before permanent damage is done. Thoes bearings are the most sensitive because there the highest ones in the transmission and the first ones out of oil. Now don't get me wrong here being low on oil won't hurt them to a point....oil sling still get oil to them but when it gets to low then there's a problem.

Automatic transmissions you know when there low...they will slip and you get a light on the dash but manual transmissions you could blow a seal and loose 70% of your oil and never know for miles or till it's usually to late

Sent from my LG-H901 using Tapatalk
Oil level checked... unfortunately this isn't the cause! :cry:

I've caved in and booked it in to be looked at by a specialist on Wednesday... all being well it's just going to be a box recon and nothing else broken down there too! :(
 
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