Remachining basic bore for valve seat rings 01.8 352/352 A 11 Release coupling nut and draw back tool at quick·action screw. while slightly raising cutter. 12 Turn hand crank and simultaneously hold lower knurled collar for horizontal feed. Reface bottom end surface until stop screw contacts body. 13 Remove cutter. and measure bore (be sure to obtain valve seat ring/bore overlap). See 1.2/4 for bore dimensions. UKO 30 40221 42-01 6.5/3