Author Topic: Helicoils  (Read 3489 times)

Offline BSA500

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Helicoils
« on: 30.06. 2010 08:50 »
I have to helicoil the drive side crankcase bolt holes(x 3).I have the kit and am ready to go(kit from Unithread great prices and service).Problem is one of the threads to be done has been previously(sp) helicoiled and it seems to be backing out or at least not sitting as it should.Can I just drill it out with the drill bit supplied and carry on *sad2*

Online bsa-bill

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Re: Helicoils
« Reply #1 on: 30.06. 2010 08:58 »
doubt you will have much luck trying to drill the insert out BSA 500, probably too hard and if you get offline you'll take out metal you will need.
If you can prize up the top thread and get hold of it with pliers it should twist out, then put a new insert in ( maybe run the tap through it first, but lightly).
No harm putting a bit of loctite in with the insert.
I've used helicoils with great sucsess others prefer different types
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline muskrat

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Re: Helicoils
« Reply #2 on: 30.06. 2010 09:10 »
G'day BSA500,
                         Don't drill it. Try to get a thin sharp scribe under the end of it and prise it out of its groove and get a pair of long nose pliers onto it and screw it out. I assume the cases are still together, you might be able to use the helicoil tap without drilling. Pack the flutes of the tap (and drill if you have to use it) with grease. Only go a couple of threads at a time and back it out, clean off grease and swarf, repack and go again. Use loctite on the new helicoils. To break off the tang pack the slot of the tool with grease and give it a sharp tap, the tang will be trapped in the grease not inside your motor.
Cheers
Bill beat me to it. *smile*
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Offline BSA500

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Re: Helicoils
« Reply #3 on: 30.06. 2010 09:14 »
Must be the way to go for two of you to have the same reply.Yes the cases are together I intend to wash down the insides with a solvent with the sump plate off as well.
Andy

Offline muskrat

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Re: Helicoils
« Reply #4 on: 30.06. 2010 09:25 »
Great minds think alike.
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Online BSA_54A10

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Re: Helicoils
« Reply #5 on: 30.06. 2010 10:13 »
Gee dose that mean I have a "great mind" ?

Dental pick to lift the edge,
Angled end tweezers to lift it off the hole
Pointed nose lock jaws to wind it out
Bike Beesa
Trevor

Offline muskrat

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Re: Helicoils
« Reply #6 on: 30.06. 2010 10:27 »
Some people have little tools  *red* LOL
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Online chaterlea25

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Re: Helicoils
« Reply #7 on: 30.06. 2010 12:00 »
Hi All,
I prefer the "time sert" inserts as these are solid and cannot move after being fitted
there is a danger with helecoils that later they might move inwards (after several removals of the case screws)
time serts can be fitted into the helecoil tapped hole if required
HTH
John O R
1961 Super Rocket
1963 RGS (ongoing)

Online bsa-bill

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Re: Helicoils
« Reply #8 on: 30.06. 2010 13:21 »
Hi John - I think I maybe have these in my Alloy head, they are copper coloured with a bit of a flange at the top, is that them and what are they like to fit??
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online chaterlea25

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Re: Helicoils
« Reply #9 on: 30.06. 2010 22:37 »
Hi Bill,
Thats the guys!! copper or black in colour,
easier to fit then a helecoil, theres a gizmo to make a recess for the tiny flange then screw them in with the expander "tap" this expands the inner ends to prevent them moving
and theres no tang to break off and lose in the crankcase *smile* *smile*
HTH
John O R
1961 Super Rocket
1963 RGS (ongoing)

Online trevinoz

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Re: Helicoils
« Reply #10 on: 30.06. 2010 23:36 »
There is a tool for removing Helicoils.
It is a triangular shape and wedges into the coil and allows it to be wound out.
I have had success with a file tang.
Trev.

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Re: Helicoils
« Reply #11 on: 01.07. 2010 11:03 »
good to know that Trev but so much more fun to struggle along with wrong stuff and broken finger nails, and then there's those little blue/black bits you get when the pliers slip off and nip your skin - joy
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

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Re: Helicoils
« Reply #12 on: 01.07. 2010 15:08 »
I have a little rule regarding thread inserts.
Helicoils go where the thread dose not have to be gas/oil tight . eg primary covers, blind holes etc.
Solid inserts ( Time cert being 1 brand ) go where the hole needs to be pressure / oil tight , eg spark plugs, sump etc.
Any fastener that goes into a hole with an insert is always coated with anti sieze paste or loctite depending upon how often it is to be removed.
Wire inserts are not necessarily pressure tight.
Bike Beesa
Trevor

Offline BSA500

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Re: Helicoils
« Reply #13 on: 02.07. 2010 08:40 »
Sucess.The metal around the insert was damaged and I had to file it down,looked like it had tried to pull out.After filing I could'nt get hold of the end so I wound in a tap until it locked and then wound it out and out came the insert.Cleaned up the threads and wound in a new one with locktight,I think the thread in the case is a little sloppy so I will test to find out if its still not good I have some tappex self threading inserts but you need a larger hole for those.
Andy

Offline BSA500

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Re: Helicoils
« Reply #14 on: 09.07. 2010 09:02 »
Well that went down the crapper.The insert is way too loose to use seems the old helicoil had done some damage while trying to escape.Looks like I have to strip the motor to get a more involved repair.Bugger.
Andy