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A scotch yoke radial compressor especially adapted for use in automotive airconditioners having a cast aluminum crankcase which is split along a plane axially passing through the center lines of the radially oriented cylinders. Each of the crankcase halves has a plurality of radially extending semicylindrical recesses which, when assembled, form the cylinders. Cylindrical cylinder liners are preassembled to the pistons and this assembly is then placed in one of the crankcase halves with the liners being received in their respective semicylindrical recesses. The second crankcase half is then secured to the first, again with the semicylindrical recesses overlying the cylinder liners. The distal ends of the liners are sealed by means of annular flanges which are clamped between the crankcase and the valve plate assemblies located at the ends of the cylinders.