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一辆丰田皇冠(TOYOTA·CROWN)牌MSZL型超豪华轿车,发动机窜油、窜气严重,经查需要更换缸套。由于配件难以解决,只能停车,有待谋取国产配件改代,加以修复。该车发动机为5M型汽油机,直列六缸,缸间距离90mm,缸径为φ83mm,缸间壁厚度为7mm。经讨论决定,采用国产合金铸铁缸套代用。实行下端定位。选用国产NJ-230型车缸套(内径为φ82~(+0.06),外径为φ86.47~(+0.03)予以加工,基本符合原车技术要求。加工中应注意缸套外径表面粗糙度应达到Ra=
A Toyota Crown (TOYOTA · CROWN) brand MSZL super luxury sedan, the engine channeling oil, channeling gas serious, check the need to replace the liner. As the parts difficult to solve, only parking, to be made to replace the domestic parts, to be repaired. The car engine 5M gasoline engine, inline six-cylinder, cylinder distance of 90mm, bore diameter of φ83mm, cylinder wall thickness of 7mm. After discussion and decision, the use of domestic alloy cast iron cylinder liner substitution. Implementation of the bottom positioning. Select domestic NJ-230 type cylinder liner (diameter of φ82 ~ (+0.06), outer diameter of φ86.47 ~ (+0.03) to be processed, basically in line with the original car technical requirements. Processing should pay attention to the outer diameter of the liner surface roughness Degree should reach Ra =