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Farmall & IHC Tractors Discussion Forum
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Re: 300 piston

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300jk

01-19-2014 11:22:12
174.226.2.178



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I was just wondering what the stock piston would measure . I think someone along the way may have put oversize sleeves in it with a stock size piston. Sleeves mic at 3.626 or close to that . Piston is around 3 9/16. Poisons do not have ih on them but have the number 2076 . Just trying to figure out what it has in it . Thanks for the help !




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D Slater

01-19-2014 11:51:39
184.14.177.12



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 Re: 300 piston in reply to 300jk, 01-19-2014 11:22:12  
Original piston diameter was 3.560 to 3.562. For your sleeve measurement the piston should be 3.622 to 3.623. Think it was in the early sixties that IH stopped getting 3-9/16 pistons and sleeves. Since the bare block bore was the same for a C-169 and C-175 engine IH started using the C-175 ones as replacements for both engines. replacement 3-5/8 pistons have the small piston pin. So if you have a big pin C-169 engine setup now, adapter pin bushings are used in the rods to match the small piston pin.

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Janicholson

01-19-2014 11:44:51
74.60.94.18



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 Re: 300 piston in reply to 300jk, 01-19-2014 11:22:12  
THe pistons would measure that small if measured at the ring lands. (where the rings are located.
To get a good size measurement, it is necessary to measure on the skirt below the rings, looking for a maximum real diameter. Also reasonable is to use long feeler gauge blades with the piston in the hole, (no rings). I use .0015", .002", .0025", .003", and so on up to .0085". More than this might be found in a hotrod but not a tractor. the pull force on the feeler when checking this way is about one pound of force. The thicker the gauge the more force needed as they are flat and the cylinder is circular.
It would not be reasonable for the piston to be assembled with .0625+ clearance. It would not operate. Jim

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