[AT] Drawn out 1949 AC-B engine rebuild

Mike meulenms at gmx.com
Sat Mar 7 16:56:35 PST 2015


I know nothing about AC engines, are they sleeved. If so you can buy a 
kit that has pistons, rings, sleeves, and take all the guess work out of 
it. If not you'll probably need to get it bored and get the proper over 
sized rings. You are going to need to find a machine shop to help you 
they are invaluable. Keep the questions coming, it's been a long time 
since someone did a rebuild and needed help with it. Your bottom end 
might be fine check the clearances with Plasti gauge like Jester said.

Mike M

On 3/7/2015 4:25 PM, Mogrits wrote:
> About 10 yrs ago my B became very hard to start and just as hard to keep
> running. A compression test revealed...that it had almost none!
>
> So one weekend while a cousin was visiting we tore down the tractor and
> engine and found we could rock the pistons in the cylinders by hand.
> Obviously the pistons, rings or sleeves or all the above were very worn. I
> bagged all the bolts and photo-documented it all and still have all the
> parts neatly arranged but have not touched it in that time. I need to get
> off my butt and get that tractor back in the field.
>
> What are the lists recommendations as to how to proceed? I purchased
> Spencers book on engine rebuilding and read it years ago, but it is still
> outside my wheelhouse as to what is necessary and what isn't. What do I
> check in the crank and what will need to be done there based on those
> findings? Head/valve work while it's apart?
>
> I'm asking for the kick in the pants that I've missed since George Willer
> passed.
>
> (BTW, this tractor has no ignition issues as the magneto was very
> professionally rebuilt by the now passed list member/magneto whisperer
> whose name I can't recall) He was an extremely kind and funny man. When he
> returned the rebuilt magneto he warned me not to park the tractor outside
> as an errant breeze might move the tractor enough to generate a spark!
>
> Warren
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