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Original Post (Thread Starter)
#716782 09/04/2021 8:27 PM
by Laurens
Laurens
Driving up the Grimselpass this week my wife suddenly lost all traction in her M3W. Shifting gears was possible. The revs went up normal But the car wouldn’t go forward. She stopped and we changed cars. To my surprise I could get the car moving like normal. Very strange. We couldn’t get a clue what happened. All looked normal again and we could drive home 100 kilometers without any problems. Today we went out for a short ride. After 30 kilometers suddenly the same happened again. We stopped. I went in her car and drove away like normal. But this time there was a noise from the back of the car. Suddenly same happened as above and lost all traction. Looking under the back I found out what was wrong. The Supermax sprocket gave up his duty.
So need to get a new one.
The only question remains how was it possible, after the first time this happened, to drive an other 130 kilometers without any problems?

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[Linked Image]
Liked Replies
#806296 Aug 26th a 09:37 AM
by Bunny
Bunny
Last week, after 16185 miles, my Supermax pulley finally gave up the ghost on the Antwerp ring road. Given the choice, I would have preferred for it to have happened closer to home but hey-ho.

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With the benefit of hindsight, I got it completely wrong in my post (dated 3rd June) in this thread. It's now clear to see that what I thought were shortened grub screws were in fact full length ones that had sheered off. Therefore, at that time there were probably only 3 full length screws remaining so a disastrous outcome was all but inevitable.

[Linked Image]
[Linked Image]

Looking at what’s left of the grub screws, they appear to be quite soft and malleable. Stainless steel maybe? Why on earth don’t Supermax use high tensile grub screws that would resist sheering?

[Linked Image]

If I had my time again, I would double-up on the screws, using high tensile ones this time. I'm sure that would have saved the holiday, prevented a lot of stress for me and Mrs Bunny (not to mention saving me from parting with a substantial amount of wonga).

Massive shout out to Chas & Steve at M3W Services (France) who pulled out all the stops to get a replacement pulley sent out to me as soon as humanly possible. Thanks guys!
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