一、柴油机水温过高极易沸腾:小型柴油机工作十几分钟后,水箱中的循环冷却水沸腾起来,这是气缸凸出量消失所至。换用新的气缸套,恢复气缸凸出量后,故障即排除。二、柴油机自行熄火:小型四轮拖拉机运行中柴油机突然自行熄火,随后摇车再起动极为困难。这是气缸燃烧积碳严重,导致气门不能密封,从而引起燃烧室严重漏气,造成气缸无压缩力,再次起动困难。研磨气门和气门座后,运转即正常。三、热车起动困难:东方红-150型拖拉机的柴油机更换活塞后,冷车好起动,但熄火后马上热车起动却非常困难,这是活塞环边隙过小所致。由于边间隙过小,在热车时,活塞环因受热膨胀而卡死在环槽内,密封失效,导致气缸压缩力不足,从而造成起动困难。更换合格活塞环后,故障现象即消失。四、油路进空气:小四轮拖拉机使用中发现其柴油机油路中经常进空气,排除后运转一段时间,油路中又发现有空气,并导致柴油机自行熄火。这是高压气体通过喷油嘴针阀偶 First, the diesel engine water temperature is extremely easy to boil: Small diesel engine working ten minutes later, the water tank in the circulating cooling water boiling up, this is the cylinder bulge disappears. For the new cylinder liner, the amount of cylinder protrusion restored, the fault is ruled out. Second, the diesel engine self-extinguishing: a small four-wheel tractor diesel engine suddenly self-extinguishing, and then start the car very difficult. This is a serious cylinder combustion carbon deposition, leading to the valve can not be sealed, resulting in serious leakage of the combustion chamber, resulting in no compression of the cylinder, start again difficult. Grinding valve and valve seat, the operation is normal. Third, the hot car starting difficulties: Dongfanghong -150 tractor diesel engine replacement piston, the cold good start, but the hot car immediately after the start but very difficult to start, which is too small piston ring gap caused. As the side clearance is too small, in the hot car, the piston ring due to thermal expansion and stuck in the ring groove, seal failure, resulting in insufficient cylinder compression force, resulting in difficult to start. After the replacement of qualified piston rings, the fault disappears. Fourth, the oil into the air: Small four-wheel tractor found in the diesel engine oil often into the air, ruled out after a period of time, the oil was found in the air, and led to the diesel engine self-extinguishing. This is high pressure gas through the nozzle needle