The present invention is to prevent the carbon deposited on the nozzle sheet portion provided between the cylinder head and the nozzle of the diesel engine, in order to easily detach the nozzle sheet from the cylinder head portion, the outer peripheral surface of the nozzle 20 and the cylinder head (10) The nozzle sheet 30 inserted for airtightness between the fastening holes of the c) has an uneven side clearance a with a predetermined gap along the circumference and the inner circumferential surface of the fastening hole of the cylinder head, and the side clearance a is expanded. It is an engine sticking prevention nozzle structure in which the gap is set to 100 to 150 µm and the reduction part gap is set to 0.5 to 1.00 mm.
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