PROBLEM TO BE SOLVED: To surely prevent oil leakage occurring at a narrow position, and to perform early repair.;SOLUTION: An oil leakage prevention method includes: a mold frame forming step which forms a cylindrical mold frame 50 for surrounding a joint 30 of piping 21, 22 forming an oil passage; a filling step which pours and fills an inorganic filler U from an opening 57 formed at the mold from 50; and a curing step which cures the inorganic filler U in the mold frame 50. In the mold frame forming step, disk-shaped end plates 51, 52 larger in diameter than the joint 30 are attached on the piping 21, 22, after that, both ends of one sheet material 55 are pasted to external peripheral faces of the end plates 51, 52 while cylindrically bending the sheet material, and thus the cylindrical mold frame 50 is formed.;COPYRIGHT: (C)2012,JPO&INPIT
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