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Jun 14th, 2026
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Joined: Dec 2020
Posts: 212
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Dec 2020
Posts: 212 |
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]](https://www.tm-img.com/images/2021/10/24/pinion-nut.jpg)
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Joined: Dec 2017
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Talk Morgan Expert
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Talk Morgan Expert
Joined: Dec 2017
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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) tis no more
2013 M3W (Olga)
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Joined: Oct 2012
Posts: 2,822 Likes: 155
Talk Morgan Expert
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Talk Morgan Expert
Joined: Oct 2012
Posts: 2,822 Likes: 155 |
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...
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Joined: Jun 2012
Posts: 2,242 Likes: 72
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
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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.
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Joined: Dec 2020
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OP
L - Learner Plates On
Joined: Dec 2020
Posts: 212 |
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.
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Joined: Dec 2020
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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)
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Joined: Dec 2020
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L - Learner Plates On
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OP
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Joined: Dec 2020
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Ian, any chance that's a left hand thread?
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Joined: Feb 2019
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Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
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.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: Jul 2019
Posts: 5,438 Likes: 467
Charter Member
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Charter Member
Joined: Jul 2019
Posts: 5,438 Likes: 467 |
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...?
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Joined: Oct 2012
Posts: 2,822 Likes: 155
Talk Morgan Expert
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Talk Morgan Expert
Joined: Oct 2012
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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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