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Frozen bolt! Advice? #722438
23/10/21 11:31 PM
23/10/21 11:31 PM
Joined: Dec 2020
Posts: 163
Ann Arbor
craig from mich Offline OP
L - Learner Plates On
craig from mich  Offline OP
L - Learner Plates On

Joined: Dec 2020
Posts: 163
Ann Arbor
Help! advice? trying to replace this torx bolt on the sprocket pinion (see arrow). It's absolutely frozen. We broke 5 torx bits on it. We tried heat, impact driver....Does penetrating fluid work on these? We're running out of options. Anyone with stories, or options?

[Linked Image]


2011 BMW 328xi Black/Black (Klaus)
2012 M3W RAF Green/Tan (Klanky)
Re: Frozen bolt! Advice? [Re: craig from mich] #722440
23/10/21 11:49 PM
23/10/21 11:49 PM
Joined: Dec 2017
Posts: 1,335
Evergreen, Colorado, USA
britmog Offline
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britmog  Offline
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Joined: Dec 2017
Posts: 1,335
Evergreen, Colorado, USA
BUGGER that is a quandary, feel your frustration unfortunately don't have an answer.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: Frozen bolt! Advice? [Re: craig from mich] #722442
23/10/21 11:51 PM
23/10/21 11:51 PM
Joined: Oct 2012
Posts: 2,624
Furry Boots City
RedThree Offline
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RedThree  Offline
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Furry Boots City
If I remember correctly, it's a Torx Plus bolt rather than a normal Torx so needs the specific Torx Plus bit to get proper purchase on it.
Apologies if you've already got this...

Re: Frozen bolt! Advice? [Re: craig from mich] #722443
23/10/21 11:59 PM
23/10/21 11:59 PM
Joined: Jun 2012
Posts: 1,805
United Kingdom, Lincolnshire
planenut Offline
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planenut  Offline
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Joined: Jun 2012
Posts: 1,805
United Kingdom, Lincolnshire

You need to use a Torx Plus 45 bit, as stated in the S&S Engine Manual page 3-47 (freely available on this link. https://www.mtwc.co.uk/wp-content/uploads/2018/01/SandS-X-Wedge-1.pdf) The replacement crank pinion bolt should be a new 12 point head bolt and is part of the cam chest modification kit, more info on this available on the MTWC website as well......but you probably know that Craig 😉. If the TP45 bit doesn't work or the head is damaged I have heard of welding a nut to the end and using that while still hot to remove it.

Re: Frozen bolt! Advice? [Re: craig from mich] #722444
23/10/21 11:59 PM
23/10/21 11:59 PM
Joined: Dec 2020
Posts: 163
Ann Arbor
craig from mich Offline OP
L - Learner Plates On
craig from mich  Offline OP
L - Learner Plates On

Joined: Dec 2020
Posts: 163
Ann Arbor
no, I didn't know. We went at that for some time. We doused it in penetrating catalyst. Afriad that will not help because there's no way for that to work in down that long bolt. And we'll perform burnt offerings tonight and go at it again tomorrow.


2011 BMW 328xi Black/Black (Klaus)
2012 M3W RAF Green/Tan (Klanky)
Re: Frozen bolt! Advice? [Re: craig from mich] #722445
24/10/21 12:04 AM
24/10/21 12:04 AM
Joined: Dec 2020
Posts: 163
Ann Arbor
craig from mich Offline OP
L - Learner Plates On
craig from mich  Offline OP
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Posts: 163
Ann Arbor
Actually welding a nut is what we're thinking. Anyone with history of doing this, I am all ears. (And there's NO WAY that was torqued to a mere 35 lbs)


2011 BMW 328xi Black/Black (Klaus)
2012 M3W RAF Green/Tan (Klanky)
Re: Frozen bolt! Advice? [Re: planenut] #722447
24/10/21 12:10 AM
24/10/21 12:10 AM
Joined: Dec 2020
Posts: 163
Ann Arbor
craig from mich Offline OP
L - Learner Plates On
craig from mich  Offline OP
L - Learner Plates On

Joined: Dec 2020
Posts: 163
Ann Arbor
Ian, any chance that's a left hand thread?


2011 BMW 328xi Black/Black (Klaus)
2012 M3W RAF Green/Tan (Klanky)
Re: Frozen bolt! Advice? [Re: craig from mich] #722448
24/10/21 12:58 AM
24/10/21 12:58 AM
Joined: Feb 2019
Posts: 3,461
Port Orchard, WA.
LightSpeed Offline
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Port Orchard, WA.
Getting the bolt hot will expand it in the threads and lock it tighter, but welding a nut to it and waiting until it is cold and heat the sprocket might work.

Re: Frozen bolt! Advice? [Re: craig from mich] #722450
24/10/21 02:31 AM
24/10/21 02:31 AM
Joined: Jul 2019
Posts: 2,060
L
Luddite Offline
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Luddite  Offline
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L

Joined: Jul 2019
Posts: 2,060
Zero experience of this engine, but craig from mich, could be right, looks to me like there is an "L" cast into the case alongside the pinion...?

Re: Frozen bolt! Advice? [Re: craig from mich] #722451
24/10/21 03:09 AM
24/10/21 03:09 AM
Joined: Oct 2012
Posts: 2,624
Furry Boots City
RedThree Offline
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RedThree  Offline
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Joined: Oct 2012
Posts: 2,624
Furry Boots City
I'm stuck a long way away from my M3W at the moment, or any of the documentation and parts that I have for it but I'm pretty damn certain that it is a conventional right hand thread and that the apparent L beside the pinion is just two sides of a shallow square recess in the casting.
The couple of times that I undid the Torx Plus bolt before converting to the later style I found that it took all that my impact wrench would give to undo it and that was with the correct bit.

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