BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)


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      10-10-2018, 09:38 PM   #23
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Drives: a little blue coupe
Join Date: Jun 2014
Location: The Golden State

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Originally Posted by Yeineken View Post
Same noise. Have had it since I can remember. I had a family member who rebuilds transmissions look at it and listen to it while running on a lift. Figured out it's the oil pump in the transmission making the noise and it's not hurting anything.

Hope that helps.

2011 N55 DCT
I have a 2011 N55 DCT as well and have had the same sound since always. Never really worried about it and thought it was just another 'normal' sound from these engines, but good to hear you had it checked out and confirmed it is normal.

Edit: meant to say just another 'normal' sound from these cars, since the sound is not actually coming from the engine.

2011 E82 N55 135i ///M Sport 7-SP DCT LeMans Blue/Black Boston Leather
Dinan S2 & PPK BMW PE BMW PS 313s Blacklines Black & Chrome Grilles Pirelli P Zeros 225/255
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      10-11-2018, 02:15 PM   #24
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Drives: 2013 Deep Sea Blue 135i
Join Date: Apr 2018
Location: Lincoln, NE

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Its good to hear that news from someone that works on transmissions. After talking to my tech we both were pretty much under same assumption that it was just a noise and he was thinking that it may be the pump just being noisy.
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      10-13-2018, 11:07 PM   #25

Drives: E82 135i 7DCT
Join Date: Jul 2016
Location: 2153

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Originally Posted by neepertech View Post
Update. 2 days after I connected ISTA+ to it there has been no more of the noise. It fucking stopped. All previous symptoms have been absent for about a month. I dealt with it for 3+ months prior. I was worried that it was a fluid level and the tranny was scavenging for fluid. I dropped the underbody pan today and pulled the tranny fill plug. IT WAS FULL! I'm at a WTF and FML point now. Noise has stopped, tranny is full of DCT fluid. I put the car on 4 point stands, checked level then pulled the allen plug and a good bit of the "lifetime" fluid ran out! I need to send back 2L of Pentosin DCT fluid back to ECS. I have no fucking idea what is/was wrong with it. No more noises, it's never acted bad. Just was really noisy and I still don't like it. I'm going to have the dealer change all DCT fluids and filters as a precautionary when I can get it to the city. The good news is is that it does not seem to be a catastrophic causing failure. I still drive the shit out of it and it always hooks up with no slippage. It's an awesome transmission. I did diagnose what I though was tranny pan leakage to a bad motor oil change. The motor pan was caked with overspill. It's all cleaned up now and will report back in a month or 2 with another trans fluid check.

Through the ISTA+ software you can run the tranny through the gear actuators with the clutch pack disengaged manually which I did. Maybe this cleared something up???? Hell if I know.

I'd like to add that the tranny has 93k on it and the fluid that came out looked good but had a dark tint to it. It looked like synth motor oil after 1k miles. Too dark for my tastes but what I would expect with a wet clutch with half the miles. This tranny seems to have an awesome filtering system. I've never done the transmissions any favors and am willing to beat the piss out of it to find a breaking point. It looks to be holding up though. It never slips, and always grabs under max torque. It did not smell or taste for that matter burnt or of abuse. I am familiar with wet clutches in bikes and this looks very clean. Getreg made a good one and I'm quite impressed.

I hate to end a thread this way but I DON'T FUCKING KNOW guys!
You opened the filler with the engine off? Oil will definitely come out. That is why you have to do the initial check with the engine idling, and top off once the fluid is 40*c. The pump needs to be spinning and circulating the oil to achieve the correct fill level.

Re-adapting the transmission/clutch can fix a lot of issues!
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      10-16-2018, 10:28 PM   #26
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Drives: 2012 135i Convertible
Join Date: Jan 2017
Location: Lost Angeles

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Well you can add me to the list -

2012 135i N55 Convertible w sport pkg.

Like someone else already noted, has happened since I can remember but seems to be getting worse over time. I also notice if im on a slight incline..backing up...the DCT seems to "slip/catch" a little, causing a judder. I swear this damn thing is at the dealer as often as its on the road.
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