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#Porta tool vw line bore tool portable
A portable line boring bar assembly, for in-line boring the main bearing bores of engine blocks for reestablishing their precise cylindricality and axial alignment longitudinally of such a block, comprising an elongated boring bar for extension longitudinally through the bores of said block centering means slidably mounted on said boring bar for temporary fitted engagement in selected bores of the block precisely to center the boring bar relative to said bores bar support means releasably mounted on said block in spaced relation to said bores to hold said boring bar in said centered position during powered rotation and axial feeding movement of the boring bar in the block, said bar support means including a plurality of bridging members individually having an upper bracket adapted to be bolted across said block, an arm adjustably extended through said bracket into the block, and a bearing on the distal end of said arm rotatably and axially slidably receiving said bar therethrough said arm of the bridging member having an upper end, a pair of diametrically opposed pins extended from said upper end of said arm, and slots in said bracket for receiving said pins therethrough to permit downward sliding of said bracket over the arm with said pins being angularly related to the slots upon rotation of the arm to align said bearing with said boring bar to provide a positive stop to preclude inadvertent disassembly by gravitational descent of the arm and bearing from the bracket should the boring bar be prematurely removed from said bearing and pre-set bore cutting means adapted to be releasably mounted in selected location along said boring bar adjacent to said bores of the block.Ģ. New and desire to secure by Letters Patent isġ. Having described my invention, what I claim as