DCT service PSA: the "Sucking Jet Pump"

Tibi_M2 · 07-29-2024, 10:40 AM

Any news in the topic, what is the source of the sound?

M3_Legend · 01-06-2025, 07:50 PM

Here is a great Video from one of the BMW world leading shop in the UK. That jet Pump really gets worn compared to the new one. At 7:00 mins you see the difference

powerbait · 01-09-2025, 12:02 PM

Another thing worth looking at on the DCT are the transmission mounts, one of mine was sheared completely in half and the other was barely hanging on, more than 3/4 torn trough. This was with 57.5k miles on the clock back in March of 2022. My car is a 2010 and I'd been running the Bimmerworld stiffer engine mounts for maybe 10k at that point. Replaced with RevShift poly mounts, the lighter durometer, NVH isn't too bad, you can tell they are there and I quite like it. 5k miles since install, not a daily driver, a hand full of track events, all has been well. This thread makes me want to pull the sucking jet, especially after that video.
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Redd · 01-09-2025, 04:17 PM

Wow this is the first time I've seen worn DCT mounts...

spammysammich · 01-09-2025, 04:46 PM

Quote:

Originally Posted by Redd

Wow this is the first time I've seen worn DCT mounts...

Don’t be surprised. Soft rubber mounts somewhat near hot pipes and warm transmission case, they probably crack at 35k and perish by 70.

M3_Legend · 01-09-2025, 07:51 PM

This was my DCT jet pump at 88,000 miles. I’m Chasing a ramdon hard engagement on first gear. I’m about to take it to a shop to Relearn clutch adaptations.

Helmsman · 01-10-2025, 01:53 AM

Quote:

Originally Posted by powerbait

Another thing worth looking at on the DCT are the transmission mounts, one of mine was sheared completely in half and the other was barely hanging on, more than 3/4 torn trough. This was with 57.5k miles on the clock back in March of 2022. My car is a 2010 and I'd been running the Bimmerworld stiffer engine mounts for maybe 10k at that point. Replaced with RevShift poly mounts, the lighter durometer, NVH isn't too bad, you can tell they are there and I quite like it. 5k miles since install, not a daily driver, a hand full of track events, all has been well. This thread makes me want to pull the sucking jet, especially after that video.

Dang...wonder if the shop checked this when the box was down for sensor replacement recently...

bidzo · 06-24-2025, 10:35 PM

I'm currently chasing hard engagement in first gear and reverse too after sitting in traffic. Already did adaptations reset, jet pump replacement and service. Does anyone know what could be the issue? Car is 2010 E92 M3 with 83k Miles. Have GTS tune. This started happening after fixing the DCT leak from the filter and doing service.

KawBoy · 06-25-2025, 10:40 AM

Fluid level perhaps?

bidzo · 06-25-2025, 11:14 AM

Quote:

Originally Posted by KawBoy

Fluid level perhaps?

It was checked many times.

M3_Legend · 06-28-2025, 10:09 PM

Quote:

Originally Posted by bidzo

It was checked many times.

Have your checked your engine and trans mounts.

Assimilator1 · 06-29-2025, 06:40 AM

I can't see that causing hard engagement problems, thumping or clonking on drive take up or throttling off, yea sure, but not gear engagement.

The clutches in a DCT box are wet, right? Have they put in the right oil?

tdott · 06-29-2025, 05:06 PM

Quote:

Originally Posted by Redd

Wow this is the first time I've seen worn DCT mounts...

Same, I've change many with 100k miles and they don.t look bad, but due to age and how cheap replacements are, it's a good to change "while in there" for other jobs. Honestly haven't seen any that torn up yet even on cars that are tracked, but I believe it.

Quote:

Originally Posted by spammysammich

Don’t be surprised. Soft rubber mounts somewhat near hot pipes and warm transmission case, they probably crack at 35k and perish by 70.

Not in my experience from the ones I've change, but they are cheap and age makes them due for replacement even if they "look" fine, or they are upgraded with other mounts in the car.

Motown65 · 06-23-2026, 12:35 AM

Quote:

Originally Posted by bidzo

I'm currently chasing hard engagement in first gear and reverse too after sitting in traffic. Already did adaptations reset, jet pump replacement and service. Does anyone know what could be the issue? Car is 2010 E92 M3 with 83k Miles. Have GTS tune. This started happening after fixing the DCT leak from the filter and doing service.

Did you do the clutch take up with ista? Sounds like clutch take up or maybe the oil pump bolts are backing out and leaking there?

07-29-2024, 10:40 AM	#67
Tibi_M2 Enlisted Member 13 Rep 30 Posts Drives: BMW OG M2 2018 Join Date: Feb 2024 Location: Luxembourg, Europe iTrader: (0)	Any news in the topic, what is the source of the sound?
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01-06-2025, 07:50 PM	#68
M3_Legend Captain 560 Rep 612 Posts Drives: BMW E90 & F31 Join Date: Oct 2014 Location: Tri state iTrader: (2) Garage List 2009 BMW 328i [9.67] 2013 BMW X5 [0.00] 2009 BMW M3 [10.00]	Here is a great Video from one of the BMW world leading shop in the UK. That jet Pump really gets worn compared to the new one. At 7:00 mins you see the difference __________________ 2009 E90 M3 DCT Space Grey current 2005 E53 X5 3.0 Alpine white sold 2008 E90 M3 6-speed Jerez Black sold 2008 E90 335I 6 Speed Black Sapphire M-sport sold 2006 E53 X5 Black Sapphire sold 2011 E91 Silver Automatic sold 2006 E91 Silver Automatic sold 2007 E91 Black sapphire 6 Speed Manuel current Last edited by M3_Legend; 01-08-2025 at 11:27 AM..
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01-09-2025, 12:02 PM	#69
powerbait postimus minimus 419 Rep 279 Posts Drives: M3 addiction Join Date: Jan 2014 Location: FL iTrader: (11) Garage List 2006 BMW M3 [10.00] 2011 BMW 1M [10.00] 2009 BMW M3 [10.00] 2010 BMW M3 [8.05] 1998 BMW M3 [9.30]	Another thing worth looking at on the DCT are the transmission mounts, one of mine was sheared completely in half and the other was barely hanging on, more than 3/4 torn trough. This was with 57.5k miles on the clock back in March of 2022. My car is a 2010 and I'd been running the Bimmerworld stiffer engine mounts for maybe 10k at that point. Replaced with RevShift poly mounts, the lighter durometer, NVH isn't too bad, you can tell they are there and I quite like it. 5k miles since install, not a daily driver, a hand full of track events, all has been well. This thread makes me want to pull the sucking jet, especially after that video.
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01-09-2025, 04:17 PM	#70
Redd Brigadier General 5039 Rep 4,842 Posts Drives: 2010 BMW E92 M3 Dakar Edition Join Date: Jul 2015 Location: Malaysia iTrader: (0)	Wow this is the first time I've seen worn DCT mounts...
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01-09-2025, 07:51 PM	#72
M3_Legend Captain 560 Rep 612 Posts Drives: BMW E90 & F31 Join Date: Oct 2014 Location: Tri state iTrader: (2) Garage List 2009 BMW 328i [9.67] 2013 BMW X5 [0.00] 2009 BMW M3 [10.00]	This was my DCT jet pump at 88,000 miles. I’m Chasing a ramdon hard engagement on first gear. I’m about to take it to a shop to Relearn clutch adaptations. Attached Images __________________ 2009 E90 M3 DCT Space Grey current 2005 E53 X5 3.0 Alpine white sold 2008 E90 M3 6-speed Jerez Black sold 2008 E90 335I 6 Speed Black Sapphire M-sport sold 2006 E53 X5 Black Sapphire sold 2011 E91 Silver Automatic sold 2006 E91 Silver Automatic sold 2007 E91 Black sapphire 6 Speed Manuel current Last edited by M3_Legend; 01-09-2025 at 07:53 PM..
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06-24-2025, 10:35 PM	#74
bidzo New Member 3 Rep 10 Posts Drives: 2010 BMW M3 Join Date: Jun 2025 Location: NY iTrader: (0)	I'm currently chasing hard engagement in first gear and reverse too after sitting in traffic. Already did adaptations reset, jet pump replacement and service. Does anyone know what could be the issue? Car is 2010 E92 M3 with 83k Miles. Have GTS tune. This started happening after fixing the DCT leak from the filter and doing service.
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06-25-2025, 10:40 AM	#75
KawBoy Captain 229 Rep 678 Posts Drives: 2012 E92 M3 Join Date: May 2012 Location: SE FL iTrader: (2)	Fluid level perhaps?
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06-29-2025, 06:40 AM	#78
Assimilator1 Major 877 Rep 1,289 Posts Drives: BMW M3 e92 08 & 330d e90 10 Join Date: Sep 2019 Location: UK, Surrey iTrader: (0) Garage List 2010 BMW 330d [8.00] 2008 BMW M3 [0.00]	I can't see that causing hard engagement problems, thumping or clonking on drive take up or throttling off, yea sure, but not gear engagement. The clutches in a DCT box are wet, right? Have they put in the right oil? __________________ . Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list.
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