Author Topic: Helicoils  (Read 3490 times)

Offline muskrat

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Re: Helicoils
« Reply #15 on: 09.07. 2010 10:10 »
G'day Andy,
                    Bugger is right. Which hole is it ? There might still be a way.
Cheers
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Offline BSA500

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Re: Helicoils
« Reply #16 on: 09.07. 2010 10:34 »
Bottom hole on the driveside crankcase for the primary chaincase so it leaks like a b*****d it looks pretty well stuffed.
Andy

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Re: Helicoils
« Reply #17 on: 09.07. 2010 11:33 »
Solid insert come in a couple of "oversizes" to counter problems such as yours.
Might be worth wile to chase up you local thread repair man and pop over armed with some good beer.
My local will do 4 or 5 for the same labour charge
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Trevor

Online bsa-bill

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Re: Helicoils
« Reply #18 on: 09.07. 2010 11:34 »
Bottom hole - Providing the insert you will use will allow it, I would repair it in situ, with the sump plate off and as much precautionary grease as you can manage and then flush it clean from through the hole and up through the sump, something like an aerosol with the fine tube/pipe on it, block the end of the pipe and make a little hole on the side of the pipe in the direction you want the contents to go ( contents being something that wont harm engine oil)
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 BSA500

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Re: Helicoils
« Reply #19 on: 09.07. 2010 11:43 »
Looks beyond my skills pretty chewed up prob better to go for a clean up,weld etc maybe offer some 'favours' to the local engineering bods *eek*

Offline wilko

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Re: Helicoils
« Reply #20 on: 10.07. 2010 01:42 »
I'm amazed how people are ready to pull out a motor so easily!! Personally i find it a pain for such a fix.Can't you just go up to another size thread with appropiate sized screw until the next serious rebuild? I avoided a pull down due to leaking twin crankcases by withdrawing the front stud and meticulously cleaning with solvent, blasting with air and filling the stud hole with silastic, reinserting stud and now no leak after 2 thousand miles!

Offline wilko

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Re: Helicoils
« Reply #21 on: 10.07. 2010 01:43 »
By the way this was on a Matchless twin!

Offline muskrat

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Re: Helicoils
« Reply #22 on: 10.07. 2010 10:04 »
Or you could drive a timber dowel into the hole and use a self tapping screw !!! LOL
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, .
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Re: Helicoils
« Reply #23 on: 10.07. 2010 10:19 »
a screw ???, have they stopped making 6 inch nails then.

Wilko's thoughts on using a bigger thread might have repercussions further down the line when you come to fix it.
Can't help wondering though if just plugging the hole and relying on the other studs to keep it on would work to keep oil in until you get around to a more secure fix
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 MG

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Re: Helicoils
« Reply #24 on: 10.07. 2010 10:24 »
One of these could be helpful:  *smile* *smile* *smile*
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

www.histo-tech.at - Restoration, Repairs, Racing

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Offline BSA500

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Re: Helicoils
« Reply #25 on: 10.07. 2010 10:41 »
Ha amatuers I can strip this down in 40 minutes.10 minutes in and the head is already off.I will go for a full repair as opening up a larger hole would mean opening up the chaincase as well to take the larger screw.This way its done properly and no need to go in again.As I am fixing her after being damaged by the thieving gits and waiting on the paint job(and cash flow :!) it gives me something to do.Typical the weathers great *sad2*

Offline BSA500

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Re: Helicoils
« Reply #26 on: 14.07. 2010 14:22 »
Had an idea asked a ace welder at work to fill the hole with weld.That's done,now I will bolt on the spacer and use that as a template to drill the hole and then run the helicoil drill in and retap for the helicoil as I feel thats stronger.Cost? nothing ace *smile*

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Re: Helicoils
« Reply #27 on: 14.07. 2010 14:59 »
only thing better than a good fix is a free good fix *smiley4*
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 #28 on: 14.07. 2010 15:17 »
You're not wrong  *smile*.Useful tip time if you can lay your hands on Xylene(I work for a pharmaceutical company) it dissolves red hermatite(sp) with a little rubbing with a rag dipped in it.BEWARE this is highly flammable and the vapours can give a nasty headache/high/death if not well ventilated-perhaps not a good idea after all.At your own risk etc etc.

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Re: Helicoils
« Reply #29 on: 16.07. 2010 11:31 »
If you have trouble getting Xylene, tell the druggist that you need it clean the oil lense on your daughters microscope that she is using for her college  homework.
In Oz it is a scheduled substance (used in manufacture of drugs ) and you need a license to buy it but the above usually works for a  1oz bottle.
In some places buying it will automatically get your name on FDA watch lists so be a little careful, particularly if you might have the odd puff on funny fags.
Bike Beesa
Trevor