Abstract: A tool for machining or repairing a worn counterbore in the cylinder block is provided with a feed control device. The refacing tool has a base structure which is attachable to the engine block. A shaft is rotatably and slidably mounted in the base structure in alignment with the counterbore and the shaft is operable by hand or by a power mechanism. Secured to the lower end of the shaft is a cutter head carrying a cutting tool mounted in a position to engage adjoining faces of the counterbore. The feed control device has an internally threaded tubular body secured to the base structure and a feed screw is threaded into the body to extend alongside the shaft. A feed plate is secured to the shaft to engage the top of the feed screw so that downward movement of the shaft is limited by corresponding movement of the feed screw. Between the feed plate and the feed screw there is a drive mechanism which rotates the screw as the shaft is rotated.