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 Damaged shock and rear caliper bolts

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evansnows
Grignapoco
Grignapoco
evansnows


Posts : 123
Join date : 2019-06-05

Damaged shock and rear caliper bolts Empty
PostSubject: Damaged shock and rear caliper bolts   Damaged shock and rear caliper bolts Icon_minitime1Sat Aug 28, 2021 1:58 pm

Yesterday I finally got round to stripping down and regreasing the rear suspension.
Fortunately nothing was dry and rusted.

The rear shock cylinder was pitted from road gravel being thrown onto it.
As it happens I recently read the thread on rear huggers and saw that someone had suggested the same solution that I used on my
900  Cagiva Elefant. A rubber skirt. I pop rivetted it in place with a strip of flat aluminium bar on the inside to hold the rubber in place.

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I also didn't like that the rear caliper was held in place with two bolts that were originally secured with some form of loctite.
I replaced them with two stainless steel socket head bolts drilled to take locking wire.

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Doc.
Don Abbondio
Don Abbondio
Doc.


Posts : 84
Join date : 2017-04-22
Age : 59

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PostSubject: Re: Damaged shock and rear caliper bolts   Damaged shock and rear caliper bolts Icon_minitime1Sun Aug 29, 2021 1:36 am

That Lock-Wiring hurts my Aircraft Engineer's Eyes, please re-do it!! Shocked
You should really de-burr the holes as well, those sharp edges can wear away at the wire.

Nice to see someone else using Lock-Wire though, so it's a good start. Thumbs Up

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janguzzi
Biondino
Biondino
janguzzi


Posts : 249
Join date : 2014-08-26
Age : 54

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PostSubject: Re: Damaged shock and rear caliper bolts   Damaged shock and rear caliper bolts Icon_minitime1Tue Aug 31, 2021 10:19 am

Stainless steel screws should not get used for brake calipers.
Simply use 8.8 screws and ensure the correct tightening torque.
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paulbrice
GRiSO Capo
GRiSO Capo
paulbrice


Posts : 1216
Join date : 2015-01-04
Age : 60

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PostSubject: Re: Damaged shock and rear caliper bolts   Damaged shock and rear caliper bolts Icon_minitime1Tue Aug 31, 2021 11:56 am

affraid uh ohh; here comes the A2 30X/8.8/Ti tensile strength -- snap -- fastener bolt thread AGAIN !
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janguzzi
Biondino
Biondino
janguzzi


Posts : 249
Join date : 2014-08-26
Age : 54

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PostSubject: Re: Damaged shock and rear caliper bolts   Damaged shock and rear caliper bolts Icon_minitime1Tue Aug 31, 2021 11:59 am

We have such a thread? At the German TÜV you could "get in trouble" with e.g. A2-70 screws.
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paulbrice
GRiSO Capo
GRiSO Capo
paulbrice


Posts : 1216
Join date : 2015-01-04
Age : 60

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PostSubject: Re: Damaged shock and rear caliper bolts   Damaged shock and rear caliper bolts Icon_minitime1Tue Aug 31, 2021 12:09 pm

The forums are littered with arguments both ways about rusty motorbike bolts (regular tensile steel) replaced with stuff that doesn't rust; they usually range between pure technical engineering perspective, through 'you need to reduce the torque settings' to the 'never had any issues in practice' angle. Trouble is they never end.

I've worked with TUV (in a professional role) in the past but limited to industrial process safety; I'm sure they won't be checking my GRiSO nuts or bolts anytime soon Wink
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Doc.
Don Abbondio
Don Abbondio
Doc.


Posts : 84
Join date : 2017-04-22
Age : 59

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PostSubject: Re: Damaged shock and rear caliper bolts   Damaged shock and rear caliper bolts Icon_minitime1Sat Oct 16, 2021 10:20 am

I was half expecting the TUV lights and sirens to go berserk when I crossed the Border into Germany on my Stelvio! What a Face What a Face
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