Helicoils

[muskrat]

G'day Andy,
                    Bugger is right. Which hole is it ? There might still be a way.
Cheers

[BSA500]

Bottom hole on the driveside crankcase for the primary chaincase so it leaks like a b*****d it looks pretty well stuffed.
Andy

[BSA_54A10]

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

[bsa-bill]

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)

[BSA500]

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

[wilko]

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!

[wilko]

By the way this was on a Matchless twin!

[muskrat]

Or you could drive a timber dowel into the hole and use a self tapping screw !!! LOL

[bsa-bill]

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

[MG]

One of these could be helpful: 

[BSA500]

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

[BSA500]

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

[bsa-bill]

only thing better than a good fix is a free good fix

[BSA500]

You're not wrong  .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.

[BSA_54A10]

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.