To keep the inside working parts of your engine clean, use engine oil and fuel that have tested engine cleaning properties.
为保持引擎内部工作部件的清洁，使用经检测具有清洁引擎性能的机油和燃料。
The car after a period of time after the operation, the cleaning time of engine cooling system is very necessary.
汽车经一段时间运行后，进行一次发动机冷却系统清洗是十分必要的。
The foundations of shaft bearings of the main engine and aux engines shall be sufficient strength in consider easy for draining, cleaning and maintenance.
主辅机的轴承底座应该具有足够的强度，同时需考虑便于排水、清扫及维护。
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