A Combined Reseater for Valves and Valve Seats.
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IT FALLS to the lot of every owner of commercial vehicles at some time or other to see that the valves of the engine on his vehicles are trued up." This is a job which is simple to carry 'out if proper tools are employed, and it is one which, is usually undertaken in the user's own garage or workshop. There are various wellstried methods of truing-up valves Which are all more or less satisfactory, but if the utmost efficiency is to be obtained from the engine it is essential that the job be accurately performed.
One of the most efficient little appliances which is designed for this purpose is a combined reseater for valves and valve seats known as the j. and S. tool. This tool differs from many others designed for the same purpose in that it trues the valve and valve seat from one central bearing, ensuring a true surface at an accurate angle to the stem.
The manufacturers and patentees of the J. and S. reseater are A. A, Jones and Shipman, Ltd., of Leicester, and they put up three sets which are specifically intended for garage use. The No. 4 set is illustrated in the accorn panying sketch, and it is equipped with the necessary accessories to enable valves and seats from 11 ins, internal diameter to 219s. ins, exterior diameter to be accurately trued up. The actual contents of the set, are a 219s-in. valve cutter, a hand vice, seating cutters of five sizes, pilots and bushes, and an operating handle.
It would perhaps be as well to give a brief description of the design of the tool, -which can be rapidly and accurately employed on the valve seats of all internal-combustion engines in which circular-seated valves are used.
The cutter is of oil-hardened steel and is Made with a male end having accurately generated spiral teeth cut an it at the valve angle to deal with the seatings, and with a female end having similar cutting teeth to deal with the
valve itself. A steel bush which is externally tapered, and with a parallel hole of the same did/lister as "the Valve stem, is inserted .in the cutter and is _ readily replaceable with bushes having toles of different diameters. The steel spigot is also of the same diameter as: the valve stem, and fits in the cox
responding bush in the cutter. It is used to locate the cutter centrally with the valve seating and stem bearing. The spigot is readily removable from the wrench rod handle to which it is secured by a hollow -setscrew. Projections or pegs on the wrench engage with corresponding slots or holes in the cutter for rotating it by means of the operating handle. This handle is-formed with one end offset at 90 degrees and squared to -form a wrench which can be used to tighten or loosen the hollow setscrew for the removal of the pilot bar, and also to secure the wrench to the stem of the valve when rotating the valve face against the female end of the cutter.
The outside of the hardened steel cutter is knurled in order to give a firm grip to the hand when the, valve stem is being rotated. Two flats are also provided so that the cutter can be conveniently held in sti vice, and any
pressure can be obtained by the simple adjustment of a spring. The general operation af the tool will be well understood 'by all those who have been faced with the necessity for carrying out valve truing and resealing jobs.
The company claim that the ,reversible cutter will completely _renew.: the angular facings of any circular valves and seatings in a fraction of the time taken by other methods, and that it encures. • absolute concentricity of the mating surfaces. The tool is certainly extremelp-well 'made, and all the parts are accurately machined.