An Inexpensive Cylinder-liner Press Handy Tool for Inserting and Extracting
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Liners Recently Added to Barra Range ADEVICE that should prove an asset to the engine-overhaul shop has recently been added to the comprehensive range of tools and equipment marketed by E. P. Barrus, Ltd., 35-37, Upper Thames Street, London, E.C.4. A product of the Ohio Piston Co., it is described as a portable sleeve press, and its function is the insertion or extraction of cylinder liners. It is available in two sizes—up to 4-in, and from 4-in. to 7-in, diameters—which cost, respectively, £7 10s. and £8.
The apparatus consists of a long. square-threaded screw, having at its base a fixed end-piece, carrying a crossbar, and a bead-piece, incorporating a nut rotatable by a worm gear, free to travel along it. The power to oper
ate the worm gear is provided by a portable electric drill or a hand brace, a 1-in, hexagon being formed on the end of the worm shaft to transmit the drive ; there is another on the screw itself for quick adjustment. Normally, a key in the head-piece fits in a keyway on the screw, preventing rotation of the latter, but this can be released at will.
The method of inserting a liner is to pass the screw through liner and cylinder, to insert the crossbar so that its ends bear on the bottom end of the cylinder, and then to adjust the head down on to the top of the liner, which it will press into position when the Tint is turned by means of the worm. To withdraw a liner, a cylindrical distance piece of greater internal diameter supports the head-piece, and the liner is extracted into it, a suitable fitting being substituted for the bar ?,t the lower end of the screw.