BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: boriscross on 21 Aug, 2020, 16:02

Title: Loosening seized barrels on a 1966 A65 Hornet.
Post by: boriscross on 21 Aug, 2020, 16:02
I guess this question has been asked many times but I'm in the process of stripping a 1966 A65 Hornet engine. The barrels are seized solid to the pistons. I've put release oil down the barrels (and I believe there has been some down there for a while). Up to now I can't get any movement at all.  I would appreciate any advise on how to proceed with this.
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: chaz on 21 Aug, 2020, 16:59
apparently coka cola is a good unseize fluid.
otherwise its a piece of plastic/wood and a hammer
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: craigc11g on 21 Aug, 2020, 19:17
where are the pistons now in the boars , top , half way etc
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: Mike Farmer on 21 Aug, 2020, 20:33
 :) :) :)

is the engine still in the frame.. If not---Put a rope around the cylinders and hang them up. Just a couple of inches above the ground is fine. Then use a wooden block and a big hammer. What you'll actually be doing is knocking the engine off the cylinders. If you just try to hammer them in situ you'll only be fighting against the crankshaft.

OR Pour a drop of petrol on top of the piston and set fire to it. Not both cylinders at the same time.

Mike 8) 8) 8)
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: Mike40M on 21 Aug, 2020, 21:22
Just a link: http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=360454
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: Mike Farmer on 22 Aug, 2020, 08:47
 :) :) :)

That works then :)

Mike 8) 8) 8)
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: craigc11g on 22 Aug, 2020, 12:31
if the pistons @halfway down the boar and engine still it frame no problem but you need to get to the end of the crank , primary side , fix and apply a load to the crank and hit top of pistons with a hard wood drift , it will move and you wont have to set fire to the bike .
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: boriscross on 23 Aug, 2020, 21:05
Thanks for all the suggestions I have loosened it now using a mixture of WD40, 3 in 1 oil and light machine oil gave it a tap every hour or so using a heavy hammer and a sawn off broom handle after 24 hours of that treatment it became loose,
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: Mike Farmer on 24 Aug, 2020, 09:02
 :) :) :)

Brilliant and thanks for up date

Mike 8) 8) 8)
Title: Re: Loosening seized barrels on a 1966 A65 Hornet.
Post by: Nanonevol on 24 Aug, 2020, 14:44
A penetrant like Kroil, PBlast or Liquid Wrench would help a lot.
But it's done.  Good job.