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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Apr-29-2017, 12:11:51 AM   #1
SinaE46
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Default A thread to clarify SMG Compression Spring part# confusion

Hey family,

As SMG owners know, the compression spring failure for the tranny is a common occurrence. We know the tell-tale symptoms and even have DIY for a repair.

However, it is still unclear to me which springs are the correct part number for replacement. BMW revised the original spring design and improved with a thicker spring. It is not easy to distinguish which is the new and improved one from product descriptions online. BMW still has both p/n in circulation. So...

1) Which spring part numbers should be avoided/which should be purchased?
2) Have all four of the SMG compression spring been redesigned/strengthened or just the "main spring"?

Here are links to just some of the relevant part numbers.

https://tinyurl.com/lbantdk - #23317511337 seems is "Main Spring"
https://tinyurl.com/ml945jf - #23311228405
https://tinyurl.com/kq3hd79 - #23311228397
https://tinyurl.com/lr86mml - #23311228393

Here is a diagram for a visual help
http://www.realoem.com/bmw/enUS/show...diagId=23_0887

Last edited by SinaE46; Sun, Apr-30-2017 at 09:29:11 AM.
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Old Sun, Apr-30-2017, 09:29:25 AM   #2
SinaE46
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Default Re: A thread to clarify SMG Compression Spring part# confusion

Hey guys. Any help with this stuff would be awesome!
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Old Sun, Apr-30-2017, 03:00:17 PM   #3
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Default Re: A thread to clarify SMG Compression Spring part# confusion

6 Speed Manual:
#23317511337
#23311228405

SMG:
#23311228397
#23311228405


Use Realoem to resolve these questions, when you look at these drawings, on the 6 speed you will see a gear position switch and bell housing locking pins on one, SMG does not have these parts so you instantly can tell:
6 speed manual:
http://www.realoem.com/bmw/enUS/show...diagId=23_0887

SMG:
http://www.realoem.com/bmw/enUS/show...diagId=23_0956


Looking again at realoem, it lists the six speed spring as superseding the SMG spring #23311228397, when I converted an SMG to manual, the rolling locking pin and spring were different lengths. I am surprised that the manual spring would fit in the SMG since it is longer. I am wondering if this is an error.

Last edited by ddaniel1; Sun, Apr-30-2017 at 11:40:12 PM. Reason: correction
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Old Mon, May-01-2017, 04:29:02 AM   #4
SinaE46
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Default Re: A thread to clarify SMG Compression Spring part# confusion

Quote:
Originally Posted by ddaniel1 View Post
6 Speed Manual:
#23317511337
#23311228405

SMG:
#23311228397
#23311228405


Looking again at realoem, it lists the six speed spring as superseding the SMG spring #23311228397, when I converted an SMG to manual, the rolling locking pin and spring were different lengths. I am surprised that the manual spring would fit in the SMG since it is longer. I am wondering if this is an error.
Thanks DDaniel!

Your post revealed I was using the 6speed diagram the entire time. Hence my idea for replacing 4 compression springs instead of only 2 in the SMG diagram.

It seems the six speed spring (#23317511337) is beefed up and the replacement for commonly broken compression spring (#23311228397) in the SMG? The item description states "D:1.40" for 6speed spring and "D:1.25" for the SMG.

Is the "D" a measurement of Depth or Diameter? Does "D:1.40" mean the spring is superior?

Last edited by SinaE46; Mon, May-01-2017 at 06:36:57 AM.
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Old Tue, May-02-2017, 04:58:20 AM   #5
ddaniel1
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Default Re: A thread to clarify SMG Compression Spring part# confusion

I think the D spec is wire diameter, but I dont know for sure. BTW The spring for the locking pin broke in half on me, it allowed the roller locking pin to shift 90 degrees and lock my shifter in 4th. Its a good idea to keep it fresh.
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Discussing A thread to clarify SMG Compression Spring part# confusion in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)