The subject innovation is in the box and, at the same time, accurately and also in a state where one of the bores (2) formed to provide a compression performance test of the single-cylinder engine block device which enables be made full performance test thereunder to be capable of performing a quick performance test the crank case 14 coupled to the scan-cut single-cylinder cylinder block (10) and; One of the combustion chamber is formed, and one of the intake and exhaust pipe is connected, and, the gasket 22 in a state of single-cylinder cylinder head 12 joined to the cylinder block 10 through an as; The cylinder head 12 and cylinder head cover 18 and the oil pan are respectively disposed in upper and lower portions of a crankcase (14) (20); In that the cylinder block crank shaft 15 that are provided in a rotatable state to 10 and the crank case 14 is composed of the diagnosis device (26) combined extend.
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