Neway PF140-5/16" -.001" | Valve Cutter Guide Pilot | Top Diameter .375

Description

Neway PM140-5/16"-.001"  | Standard Series Solid Valve Guide Pilot | Top Diameter .375
Center Portion of Taper (Middle) -  0.3115" (7.91mm)
Widest Portion of Taper (Top) -----  0.3125" (7.94mm)
Bottom Portion of Taper Length - 3.00" Long
Top Portion of Pilot Shaft (Cutter Portion):  .375 Diameter - 3.00" Long
Center-less ground for extremely tight tolerances.
Made in USA
The following information is from Neway Manufacturing Technical Recommendations:
The pilot is absolutely critical to getting a concentric valve seat. It “pilots” the cutter by indicating off the same bearing surfaces that the valve stem will be riding on, and carrying that center-line up to the cutter. If the pilot is not straight and concentric, the cutter cannot form a concentric seat. Neway pilots are center-less ground, a process that enables us to hold extremely tight tolerances.
Solid pilots have a very slight taper ground into them, so that they lock into the valve guide. The rate of taper is just .0007” per inch (7 microns/cm). This very slight taper means that the pilot will be hanging onto enough of the length of the guide bore to accurately capture the center-line. The flip side of having such a slight amount of taper is that a single pilot can only accommodate a small amount of variance between guide bore sizes, so you will usually require more than one solid pilot for any given nominal size.
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