Sat Jul 10, 2021 6:01 pm by Buzzman72
The MT-97 shows the pushrod as IH part number 69733R11.
The ag engine doesn't cross over to this number, or vise-versa.
But I found a TON of specs on this part, under NSN 2805-00-374-9399:
Technical Data | NSN 2805-00-374-9399
Characteristic Specifications
MATERIAL STEEL
END HARDNESS RATING 57.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM
END CASEHARDENING INDICATOR CASEHARDENED
BODY OUTSIDE DIAMETER 0.375 INCHES NOMINAL
OVERALL LENGTH 11.969 INCHES NOMINAL
STYLE DESIGNATOR K6 SPHERICAL, UNDERCUT OPTIONAL FLAT FIRST END
CHAMFER ANGLE IN DEG K12 CUP W/SHOULDER AND CHAMFER SECOND END
SHOULDER LENGTH 77.5 SECOND END
CHAMFER LENGTH 0.063 INCHES NOMINAL SECOND END
UNDERCUT DIAMETER 0.281 INCHES NOMINAL SECOND END 0.365 INCHES MINIMUM AND
UNDERCUT WIDTH 0.370 INCHES MAXIMUM FIRST END 0.109 INCHES MINIMUM AND
END LENGTH 0.125 INCHES MAXIMUM FIRST END 0.3085 INCHES MINIMUM AND 0.3165 INCHES MAXIMUM FIRST END
END LARGEST DIAMETER 0.344 INCHES NOMINAL SECOND END 0.382 INCHES MINIMUM AND 0.386 INCHES MAXIMUM FIRST END
FLAT DIAMETER 0.500 INCHES NOMINAL SECOND END
END SPHERICAL RADIUS 0.150 INCHES NOMINAL FIRST END 0.191 INCHES MINIMUM AND 0.193 INCHES MAXIMUM FIRST END 0.1865 INCHES MINIMUM AND
SPHERICAL RADIUS DEPTH 0.1885 INCHES MAXIMUM SECOND END
BODY TYPE 0.209 INCHES NOMINAL SECOND END
III FSC APPLICATION DATA TUBULAR
THE MANUFACTURERS DATA GASOLINE ENGINE,NONAIRCRAFT
MANUFACTURERS CODE 71772
DESIGN CONTROL REFERENCE I18-1872
Apparently, this pushrod had a military usage. But it exclusive to the straight-valve SD and BD engines.
Since this spec shows a cup end [at the rocker arm], I don't trust that Melling part number at O'Reilly.
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