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Allis Chalmers HB112


DaninWashington

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DaninWashington

I have an AC HB112 that need an engine rebuild. Looking for parts and advice. Thank you in advance.

 

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The B&S cast iron 12HP/30CI has a 3-7/16" bore and oversize pistons are extremely hard to find. You can bore it to 3-9/16" for a standard 14,15 or 16HP/32CI piston. The 0.020" undersize connecting rod, P/N 390306, are becoming hard to find but there is one on eBay. I would also replace both valves. The intake valve used before date code 7004171 is P/N 230861. The intake valve used after date code 7004161 is P/N 261206 which supersedes to P/N 394435. The seat angles are different. If you need P/N 230861, there is one on eBay. The original exhaust valve is P/N 261207 which supersedes to P/N 394436. The seat angles are the same. There is a difference between the old and new style valve keepers. The rest of the parts should be still available. Need more help PM me.

Edited by Bill725
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