The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: v8ivor on 18.11. 2015 19:47

Title: Separating A10 crankcases
Post by: v8ivor on 18.11. 2015 19:47

I hope you can help me yet again ! Has anyone got any tips on separating the crankcase halves ( I think it's old joint paste holding them ) And I can't shift the woodruff key on the crankshaft/ oil pump gear.

Title: Re: Separating A10 crankcases
Post by: bsa-bill on 18.11. 2015 22:29

I'll state the common cause of crankcases not parting, forgive me if it is not this but we've probably all done it - forgot the internal nut (oft referred to as the infernal nut  )

Title: Re: Separating A10 crankcases
Post by: v8ivor on 18.11. 2015 23:32

Thanks Bill, but that's off, I will try and remove the studs in case they have corroded in the alloy cases.

Title: Re: Separating A10 crankcases
Post by: Topdad on 19.11. 2015 11:21

no disrepects also But I've seen sump plates put up a hell of a fight when splitting cases  *lol* seriously perhaps either or both main bearings . The timing side ,I seem to remember gets a ridge at its end and the drive side can just be stubborn . Sure I've been able to apply reasonable leverage  from the inside to start the process . best of luck, Bob

Title: Re: Separating A10 crankcases
Post by: v8ivor on 20.11. 2015 08:27

Thanks Bob, I've only applied hand pressure so far, but wanted to check it out with you guys first in-case you had some tips, so I will apply some leverage from the inside next  ( If I can shift that stubborn woodruff key ) ,Ivor.

Title: Re: Separating A10 crankcases
Post by: Rocket Racer on 21.11. 2015 23:17

as long as ALL the bolts are undone, a few discreet taps with a rubber mallet or a mallet will normally get them apart.

Title: Re: Separating A10 crankcases
Post by: bsa-bill on 22.11. 2015 10:44

Quote

discreet taps

Ah now, pleasant memory's of being indiscreetly tapped up  *whistle*

Title: Re: Separating A10 crankcases
Post by: Guy Wilson on 23.11. 2015 08:15

I've recently split two  crankcases without too much resistance. Apart from doing an idiot test (which I have to do regularly) and re checking all the securing bolts are removed, its probably just the passage of time and a bit of surface rust/gasket holding it together.  I A few taps with a rubber mallet should be enough.
Guy

Title: Re: Separating A10 crankcases
Post by: v8ivor on 23.11. 2015 19:49

Thanks Guy,
I separated them using two rubber faced sash clamps in reverse, top and bottom. It was the gasket sealant mainly around the studs doing the holding.
And I was being over cautious because I've worked on engines after someone's used a hammer and chisel before.
Thanks to everyone else as well.

Title: Re: Separating A10 crankcases
Post by: BSA_54A10 on 16.12. 2015 09:16

A trick that has worked well for me is supporting the "top" half of the case by the throat and sump.
Pop this in the oven with a nice lump of roast.
After a while the bottom 1/2 will drop offdue to the heat & weight of the crank.
Flip it over and allow the crank to drop out of the other side.
No wacking required.
Enjoy the roast.