所谓擅自改装,就是使用者出于各种目的,未经有关部门批准,自行改变原生产厂的设计、改动零件或尺寸、数量和安装位置的措施。实际上,目前用户改装机动车辆大致有以下几种形式:改变总体结构。例如换汽油发动机为柴油发动机,改纸芯空气滤清器为油浴式气滤器等:提高行驶速度。例如拆除柴油机喷油泵高速器的铅封,进行不合理调整(特别是调 The so-called unauthorized modification, is the user for a variety of purposes, without the approval of the relevant departments, to change the original design of the original plant, changing parts or size, quantity and installation location of the measures. In fact, the current user modified motor vehicles generally have the following forms: change the overall structure. For example, for gasoline engine for diesel engine, paper core air filter for oil bath air filter, etc.: to improve driving speed. For example, remove the seal of diesel injection pump high-speed, make unreasonable adjustments (especially tune