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Farmall & IHC Tractors Discussion Forum
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M W pistons

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960

03-01-2007 20:55:01




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How does one tell the difference between M & W and Firecrater pistons in an M as viewed from the top while in the engine.




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Lawmar

03-02-2007 05:24:52




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 Re: M W pistons in reply to 960, 03-01-2007 20:55:01  
Experience - If you tear enough M farmall engines down you get to know what the different pistons look like. Same with heads. I bought a 400 Farmall and with simply taking one spark plug out I could tell it had IH Fire Crater Pistons in it and it had the 450 or 281 ci head on it. I came out good on that tractor. Of course none of this helps you. You will need to get a M&W piston and look at it and then take a look down your spark plug hole. You may want to buy a fiber optic viewer if your not sure what to look for. Or buy a head gasket and pull the head. Two people can have a head off in 20-30 minutes 40-60 if your slow. You oculd also have someone with some experience look down in there also. A viewer will also let you see ring groove and condition of the valves.

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960

03-02-2007 10:22:52




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 Re: M W pistons in reply to Lawmar, 03-02-2007 05:24:52  
I have the head off and am looking for the description of visual differences as I am looking at the piston tops.



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ChadS

03-02-2007 17:15:30




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 Re: M W pistons in reply to 960, 03-02-2007 10:22:52  
The new style pistons will be a D shaped, double humped dome(SM-450) , pretty square on its shape,,, the firecraters will have a small dip on one side, the domes will be more rounded at the tops of the domws, rather than a boxy shape. The M"s new style domes are a D shaped dome, not very tall, maybe .250 tall if that. Hope this helps ChadS



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