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 Post subject: Pedal thread problem ...
PostPosted: Sat Nov 03, 2012 1:00 pm 
PoTM Winner
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Joined: Tue Sep 25, 2012 7:21 pm
Posts: 1156
This mornings tinkering has yeilded another problem ....

At some point the thread has obviously been knackered in the drive side crank pedal spindal hole ... I didn't notice this when I removed the pedal.

When I offered up the new pedal the hole was too big :shock:

On inspection of the pedal spindal I removed weeks ago I now see the drive side pedal has a "sleeve" making it bigger.

The crank hole has been tapped out bigger and this "sleeve" in the pedal spindle is obviously bringing it up to size to fit.

Where do I get one of these sleeves to fit the new pedal in with?

Is this a "Helicoil"? and if so how do you fit them?

Here is a picture of the pedal that came out ...

Image


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 Post subject:
PostPosted: Sat Nov 03, 2012 2:14 pm 
Gold Trader
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Joined: Sun Jun 22, 2008 1:38 pm
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Location: OZ
Its a helicoil

normally fitted with a special t shaped tool. If you grip the helicoil lightly in a vice you might be able to unscrew it from the old pedal. then you just screw it onto the new pedal and refit carefully.

Andy


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 Post subject:
PostPosted: Sat Nov 03, 2012 2:21 pm 
PoTM Winner
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I'm reluctant to mess about with the old pedal as, at this point it is the only one that can be used in this crank.

Where can you buy helicoils for 9/16?


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 Post subject:
PostPosted: Sat Nov 03, 2012 2:31 pm 
Gold Trader
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Joined: Sun Jun 22, 2008 1:38 pm
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Location: OZ
Any bike shop that fixes stuff rather than than just fitting new stuff will have em

Alternatively specialist tool shops will stock helicoil kits, and maybe spares....

Andy


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 Post subject:
PostPosted: Sat Nov 03, 2012 4:16 pm 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1321
Location: Cotswolds
Back in the 1960's there was a kit made with a reamer, double ended tap and threaded inserts. We used to fix the insert by gently expanding the ends with a small hammer.
You might be able to screw it back in then use a small punch to expand the inner edge so that the insert would stay in.


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 Post subject:
PostPosted: Sat Nov 03, 2012 7:22 pm 
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 1799
Location: A wretched hive of scum and villainy...
I can help you out with a new helicoil if you need...about £5 UK posted, or you can send me the crank and pedal, and I'll take the old one off the pedal or fit a new one in the crank.

I usually fit with Loctite 638 retainer to make sure it stays in the crank, rather than screwing out with the pedal.

Made a nice tandem crossover set with 3 sets of Campag UT cranks...got a few helicoils left over.

All the best,


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 Post subject:
PostPosted: Sat Nov 03, 2012 10:18 pm 
PoTM Winner
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Well thanks for the input.

Using a pair of rubber lined grips I have removed the sleeve from the old pedal which appears to be a metal cylinder that has a thread inside and out.

I have been able to reuse the sleeve to put the new pedal in and tighten it just as tight as I would normally and it's solid.

Looking at the park tools site

http://www.parktool.com/blog/repair-hel ... ushing-kit


The sleeve looks exactly like that. If its good enough for them it's good enough for me.


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 Post subject:
PostPosted: Sun Nov 04, 2012 12:06 am 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1321
Location: Cotswolds
As you say, its a threaded sleeve, specially made for crank repair, a helicoil is just like a coil spring.
We used to secure them by gentle use of a small ball pein hammer, and finish with a thread tap.
Try this, page 83. Yes 1939.

http://oldroads.com/brown_brothers_1939.asp


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 Post subject:
PostPosted: Sun Nov 04, 2012 12:15 am 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8223
Location: Cumbria
Doesn't look look like a helicoil to me..just a repair from the olden days..

We had a selection of "oversise" bottom bracket cups and the like which we used with the corresponding taps.....

Shaun


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 Post subject:
PostPosted: Sun Nov 04, 2012 4:20 pm 
Retrobike Sponsor
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Joined: Sat May 22, 2010 10:33 pm
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Location: Suffolk
If it is a heli coil then I keep the cyclus ones. Drop me a pm if you need one.


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