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检修一台配S195柴油机的长春—12型小四轮拖拉机,在安装齿轮室盖时,由于没有预先将凸轮轴推靠,就扣合齿轮室盖,结果造成油泵扳手座管状半圆形凸台与凸轮轴相卡滞,碰伤凸台壁。装后柴油机工作一段时间,损伤的凸台受凸轮轴窜动的摩擦冲击力作用而折断,使凸轮轴失去轴向定位,而产生过大的轴向窜动,引起柴油机供油正时与配气正时产生周期性波动变化,导致柴油机工作不正常,转速忽高忽低的现象。重新车制一新件,安装时,不但注意了将凸轮轴推靠,而且采取先扣合齿轮室盖,后装油泵扳手座的做法。同时又在未装油泵扳手座闷头和轴后盖前,插
Overhauled a Changchun -12 small four-wheel tractor with S195 diesel engine. When the gear chamber cover was installed, the gear chamber cover was fastened because there was no pre-camshaft thrust, resulting in a tubular semi-circular boss Cams with the cam shaft, bump convex wall. Installed after the diesel engine working for some time, damage to the boss by the impact of the camshaft movement of the impact of the role of the fracture, the camshaft lost axial positioning, resulting in excessive axial play, causing the timing and distribution of diesel fuel Gas timing produces periodic fluctuations, resulting in diesel engine is not working properly, the phenomenon of high and low speed. Re-car a new piece, the installation, not only pay attention to the camshaft push, and take the first snap gear chamber cover, after the installation of the pump wrench seat approach. At the same time not installed in the pump wrench seat head and shaft back cover, insert