Originally posted by eacmen
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Loud thud when going into reverse SMG, strange clutch egements
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Originally posted by BMW_QAS View PostBefore I swapped out to manual my car had semi-similar issues. Took a long time to go into reverse, gear change indicator would blink and the car would not go into gear, only gears selectable were odd gears 1,3,5. As it turns out my car had multiple problems.
The transmission mount crossbar was cracked in two places and the “ears” of the transmission were broken off. Nothing was physically supporting the transmission. Car had aluminum mounts on the engine and trans.
Inside the transmission bellhousing the plastic shift pivot point was broken completely. The shift arm was free floating. The throw out bearing looked original, and had copiously large amounts of sludge and yuck all over it. The clutch disc was worn almost to the rivets.
What I’m trying to say is: You may have multiple issues. Don’t rule anything out until you or a mechanic you trust looks at the system as a whole.
Good luck,
-Steve
Took it for a drive yesterday, this time when I started it up, waited for the RPMs to drop after being cold and no slamming in reverse. Weird.
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Here is the cross brace. The cracks could not be seen by just looking under the car. The crossbar fell apart when the load on the transmission was removed.1 Photo
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Before I swapped out to manual my car had semi-similar issues. Took a long time to go into reverse, gear change indicator would blink and the car would not go into gear, only gears selectable were odd gears 1,3,5. As it turns out my car had multiple problems.
The transmission mount crossbar was cracked in two places and the “ears” of the transmission were broken off. Nothing was physically supporting the transmission. Car had aluminum mounts on the engine and trans.
Inside the transmission bellhousing the plastic shift pivot point was broken completely. The shift arm was free floating. The throw out bearing looked original, and had copiously large amounts of sludge and yuck all over it. The clutch disc was worn almost to the rivets.
What I’m trying to say is: You may have multiple issues. Don’t rule anything out until you or a mechanic you trust looks at the system as a whole.
Good luck,
-Steve
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Originally posted by Johnvu View PostI had a similar loud clunking issue when downshifting at higher RPM and what felt like weird shuttering and chatter at low speed. It turned out the front poly diff bushing extruded itself onto the diff and out of the housing. I just replaced it with the upgraded design from revshift. The car no longer has these issues and drives very solid.
I would suggest two things:
1. Run the smg bleed and adaptation procedures again. I ran mine like 5 times after my relocation lol.
2. Check the front diff bolts and all diff bushings.
Good luck and hopefully this helps!
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I had a similar loud clunking issue when downshifting at higher RPM and what felt like weird shuttering and chatter at low speed. It turned out the front poly diff bushing extruded itself onto the diff and out of the housing. I just replaced it with the upgraded design from revshift. The car no longer has these issues and drives very solid.
I would suggest two things:
1. Run the smg bleed and adaptation procedures again. I ran mine like 5 times after my relocation lol.
2. Check the front diff bolts and all diff bushings.
Good luck and hopefully this helps!
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I'd take it the shop cudzich09 mentioned as I've seen them mentioned a bunch over the years but couldn't think of the name. Much better place to start than a dealer.
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Originally posted by eacmen View Post
If it was the front diff bolt you would hear a clunking sound during load change. Many front diff bolts have been misdiagnosed as "M clunk".
If you have a go pro mount it under the car looking at the diff and watch what it does when you shift gears. Or get a buddy to look under the car while you're shifting in a parking lot. If the bolt backed out or bushing gone bad you should see some significant movement when engaging/disengaging the clutch.
My bet would be the adaptation procedure was not run or there may be a physical issue with the clutch (slave cyl, clutch wear, etc). I would start by bleeding the clutch slave (just because its an easy thing to do) and then doing an adaptation.
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Originally posted by oceansize View PostAlso:
9. Check front diff bolt.
If you have a go pro mount it under the car looking at the diff and watch what it does when you shift gears. Or get a buddy to look under the car while you're shifting in a parking lot. If the bolt backed out or bushing gone bad you should see some significant movement when engaging/disengaging the clutch.
My bet would be the adaptation procedure was not run or there may be a physical issue with the clutch (slave cyl, clutch wear, etc). I would start by bleeding the clutch slave (just because its an easy thing to do) and then doing an adaptation.
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Originally posted by oceansize View Post
Post a new thread stating you are looking for a specialist shop in Chicago, you will get good advice on where to go and where not to go.
(224) 676-0756
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