[SEL] Crankshaft extending

[Michael Young]

Hi,  this is what I had done on a largish pommy engine ('06 9 1/2hp Hornsby 
Ackroyd - ie. single flywheel).  It had a bad bend in the 3" crank, that had 
been cut off just outside the bend.  A spiggot was turned on the stub end 
and another piece of 3" and a bit with  the same size hole as the spiggot 
pressed on to make up the correct length.  The joint was then welded and 
ground on the lathe back to the 3".  It is so good I cant tell exactly where 
the join is and no I didnt do it myself - I paid a few bucks to a guy who is 
smarter than me - worth every cent.  Sure I wouldnt try and drive anything 
with it, but I would mount a pulley on it just for show. The engine lives 
now and runs quite nice.  I posted this a few weeks ago, but here it is 
again

http://www.youtube.com/watch?v=2w0yXj5-yiw


Michael Young
5 Beech Crescent
Orange  NSW  2800
AUSTRALIA
http://community.webshots.com/user/mioldengines

----- Original Message ----- 
From: "Best, George" <George_Best at adp.com>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Thursday, September 13, 2007 2:32 AM
Subject: [SEL] Crankshaft extending


> I've got an engine where someone took a hacksaw and shortened the
> crankshaft for some reason.  Maybe it stuck out too far and they didn't
> want to use a belt pulley on it.
>
> I'm wondering if it is feasible to extend the crankshaft, or should I
> find replacement crankshaft instead?
>
> What I'm thinking is that I could put the crankshaft on the lathe and
> true up where they cut the shaft.  Then center bore the shaft.
> Make an extention piece with a stub to fit the bored hole in the
> crankshaft.
> Press the extention piece in.
> Weld the seam.
> Then clean up the joint in the lathe.
>
> Does this sound like a feasible way to fix the crankshaft?
>
>
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