Reamer Coolant Bushings:

Variables such as reamer material or design, engine valve guide material, temperature at the reamed surface, drill speed, operator movement and inconsistent feedrates affect the engine valve guide reaming process. By controlling these variables to the best extent possible, the valve guide reaming process can quickly and easily produce highly accurate, and consistently sized valve guide bores that are superior to even new valve guides!  Our reamer coolant bushings are designed to minimize the affects of both the temperature at the reamed surface and operator movement.

The reamer bushings are precisely machined from 52100 steel before being hardened. This hardening ensures that your valve guides will be consistently reamed without any out-of-rounding caused by worn bushings. The bushings are provided with a coolant port that sends the coolant directly to the leading edge of the reamer. The outer diameter of each bushing is ground to an OD of 0.6247+/- 0.0002 in. to fit tightly into your existing valve seat cones. The barrel is perpendicular to the seat cone mating surface to within 0.0005 in. and the bore is concentric with the barrel to within 0.001 in. 

By placing the reamer/cone/bushing assembly against your engine valve seat while reaming the guide, you are eliminating any error that would otherwise have been caused by operator movement. By using the reamer bushing, you'll also be injecting the reamer cutting surface with coolant which reduces the temperature at the cutting surface and washes away the metal particles. Thus, your reamed guides will be more consistent. They'll also be perfectly aligned with the valve seats, and have a better surface finish. For more information on the advantages on wet reaming, read our study entitled, Effect of Coolant Use on Valve Guide Diameter During Reaming.

The following bushings are in stock for immediate delivery.

These bushings can be used for dry reaming or connected to coolant systems. Other sizes can be made to your specifications. Call for more information.

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