Useful Equipment for Reconditioning Valves
Page 35
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A Range of Black and Decker Tools Designed to Facilitate all Valve re conditioning Operations
T"condition of the valves and valve seats has an important bearing upon the economy and smooth-running characteristics of any commercial-vehicle engine, and these components usually receive careful attention when overhauls are undertaken, When maintaining a fleet of machines it is obviously undesirable, if maximum efficiency is to be attained, that the valves and seats be reconditioned manually when the provision of suitable equipment for these operations may, at the same time, effect coesiderable savings.
A new range of equipment for this purpose has recently been introduced by Black and Decker, Ltd., Slough, and the various tools have been carefully designed and incorporate a number of advanced features.
An accompanying illustration shows the latest valve refacer and it will he noted that it is a self-contained unit, power being obtained from two AC/DC motors, obtainable with voltages of 110, 220 or 250. One moter in the base drives the wheel spindle, whilst the second motor, incorporated in the work-head housing, drives the collet spindle through a . double-reduction belt.
A new method is employed for feeding the valve acmes the wheel, and it is claimed that this combines the accuracy of a screw feed with the speed of lever feed. Less than one turn of the handle is required to traverse the average valve face; the head is adjustable for any valve angle up to 90 degrees.
A useful attachment for the machine is a micrometer valve-. stem grinder for squaring and grinding Fordson valve stems to the exact tappet clearance. The attachment is easily fitted and enables this operation to be carried out quickly and with a high degree of accuracy.
For use in conjunction with the refacer is the VibroCentric valve-seat grinding outfit, which is also shown in an accompanying illustration. The spindle which drives the stone is connected through a sliding joint to the armature shaft, which, when unloaded, rotates at 12,000 r.p.m. A simple mechanical device automatically vibrates the spindle and lifts the stone from the valve seat once every revolution. This vibrating action makes it possible to deal accurately •and quickly with valve seats of stellite, alloy steel or cast iron.
The Vibro-Centric outfit is available in the form of a fitted kit box containing all the necessary components for valve-seat reconditioning. Mention should also be. made of the B. and D. Electric Valve Shop, which comprises the refacing machine, mounted on a neat cabinet running on castors. The Vihro-Centric outfit is kept in the cabinet, together with the necessary pilots, stones, sleeves, etc. An adjustable lamp is a handy fixture on top of the cabinet and may be used for lighting the refacer or the stone-dressing stand which is adjacent.