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drmini in aust
PostPosted: Thu Jun 16, 2011 11:32 am 
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religious status
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW
I have just successfully fixed a Mk1 S dizzy with this problem, without doing any welding.
I machined the cracked shoulder doen to 1.100" dia, then made and shrink fitted an alloy ring on there. Now that it's solid metal like the later dizzys (45D etc) it won't crack again.

Soooooooo, bring out your dead dizzys... :P :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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66S
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PostPosted: Thu Jun 16, 2011 12:05 pm 
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998cc
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Joined: Wed Sep 13, 2006 7:26 am
Posts: 900
Location: Christchurch New Zealand
Common fault Doc. Another way is to cut a diagonal split in the ring. This makes it a slip fit and the clamp then clamps the ring on the dizzy. Well done !!

Al


Last edited by 66S on Thu Jun 16, 2011 12:15 pm, edited 1 time in total.

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Morris 1100
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PostPosted: Thu Jun 16, 2011 12:09 pm 
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Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124
Mine has just enough metal for the clamp to grab onto. It could do with fixing.
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simon k
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PostPosted: Thu Jun 16, 2011 12:11 pm 
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Joined: Wed Sep 08, 2004 9:27 pm
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Location: Wodonga - Vic/NSW border
I "fixed" dad's with some of that "knead it" epoxy stick stuff. Worked OK, but I'll use your idea if it breaks again Kev ;)
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