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Farmall Cub Engine Kit

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Ron Haling

03-31-2008 05:36:23




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I have a Cub 1949 model Cub Serial No. 14241
I have just purchased an Engine Kit which has domed pistons.My understanding is that early Cubs like mine should use Flat top pistons and not dome as dome is for later model Cubs
Can anyone advise how important this issue is?
Should I have the domes machined down to flat?

Many Thanks




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Larry in WNY

04-01-2008 09:02:19




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 Re: Farmall Cub Engine Kit in reply to Ron Haling, 03-31-2008 05:36:23  
Can you measure from the center of the wrist pin to the end of the pistons? Then measure the new pistons the same way with the peak of the dome as the highest point. The difference should tell you if the head needs to be machined. A good machine shop should have the tools to measure your pistons.

Larry



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gene bender

04-01-2008 03:10:55




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 Re: Farmall Cub Engine Kit in reply to Ron Haling, 03-31-2008 05:36:23  
I doubt whether the manufacture of the pistons would have made them if they didnt fit.



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mkirsch

03-31-2008 11:01:53




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 Re: Farmall Cub Engine Kit in reply to Jack OH, 03-31-2008 07:44:10  
The combustion chambers may need to be clearanced on that old of an engine so the tops of the pistons don't hit. I don't think you need to machine the pistons themselves, and you can clearance the head yourself with a die grinder and a carbide bit.



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Janicholson

03-31-2008 06:41:57




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 Re: Farmall Cub Engine Kit in reply to Ron Haling, 03-31-2008 05:36:23  
The issue is compression, and this tractor can use all it can get. 11-12 hp is not much. The pistons will make more power. That said, the other issue is we can't tell how high the domes are. There are no valve clearance issues on a flat head engine design. So, the only way to check this is to put a piston on a rod and put it on the crank with the insert. (rings not needed). Place a thin layer of clay over the top of the piston (1/16" thick) then use the old head gasket, and a few head bolts in that cylinder to hold it down pretty well, no need to torque it. Then ---hand--- turn the engine through one revolution. and pull the head. If no marks, good to go. if marks are made, measure the thiscness of clay in the mark. If 1/32" or less, and in one spot, all the pistons need to be evenly machined to clear the 1/16" requirement (usually not much, but evenly to maintain exact wt.)
If it rotates and stops hard against something, leave it there, do not force (even by hand) the engine through the TDC position. THis will tell the tale. Good luck, JimN

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