Whitworth bolts

[k. rogers]

I need two 4" x 1/2" BSW bolts or studs so I can use my flywheel puller. Anybody know a stockist happy to sell just two?

[george garside]

The late Roy Braddock, a renowned authority & club vice president always used wooden wedges and a sledge hammer to remove flywheels on the twins, This was, he said, because it eliminated the possibility of cracking the flywheel which could occur when using a pullar on a particularly stubborn one. He had 2 hardwood wedges around 18" to 24 " long and abaout4" wide tapering from zero to 2" ( if my memory serves me right) but the dimensions are probably not that critical.

The crankcase is stood on the timing case end and the wedges are placed behind the flywheel facing opposite ways & either side of the end of the crankshaft. They are hammered alternately with a sledge hammer and off the flywheel pops~! I watched him do this many times and used this method myself , borrowing Roy's wedges!

george

[Jack]

For ones and twos I find ebay to be a great place for this kind of thing, but can't see any bolts long enough for this particular question.

Found this supplier, showing 1/2" x 4" hex bolts, not sure if you need 4" of thread on there? http://www.thomassmithfasteners.com/hex ... s_bsw.html - they're not particularly cheap, but they will sell singles.

If you just need a set screw then they've got those too for much cheaper http://www.thomassmithfasteners.com/hex ... s_bsw.html

Worth checking the shipping cost too with singles retailers like this. I have no experience of dealing with them, but they seem to be one of fairly few with what you need available.

Jack.

[Tony Fearn]

Hello again Ken,

My homemade flywheel puller (over 30 years old) consists of a rectangle if 1/2" thick steel with a couple of lengths of screwed bar with nuts.

Tomorrow I'll go to the garage and see if there's any 1/2" Whit. screwed bar left somewhere, and let you know through JowettTalk.

I know of the wedge method that George mentions, and IP and I used it sucessfully on my 1927 long two engine, but on the crankshaft pulley.

Don't know whether the rim on the engine casing that the gearbox bolts on to, being over 70 years old, will be able to stand wedges and a lump hammer.

Tony.

[Keith Andrews]

I assume u guys have Whit tape and dies sets.....
just run a die down some rod.

[Forumadmin]

Not so easy on high tensile which is what is required for this application.
I get most of my bolts from f-e-s.co.uk

[Tony Fearn]

Hi Ken,
There's no whit screwed rod left (or it might just be under a pile of Jowett bits somewhere).
But nihil desperandum, I found some 10 x 1/2" long bolts and, as KA suggested, I've cut them down to about 4 1/2", removing the head, and screwed both ends of each of them with a 1/2" Whitworth die.

They're on their way to you by courtesy of The Post Office together with a couple of nuts and washers.

If you buy me half a pint in Wales, we'll call it straight.

Tony.

[k. rogers]

Tony, you are a star! I might even stretch to a whole pint!

[k. rogers]

Finally got around to using the puller today using the bolts which Tony sent (thanks again, Tony) and success, off the flywheel popped without any trouble at all!