有一台正常行驶的北京BJ212吉普车,驾驶员保养化油器和更换发动机机油后,发动机内部发出一种异常响声,且在低速、中速、高速均有此响声。 根据响声特点,判断可能是保养化油器时掉进异物所致。打开缸盖检查气缸内并无异物,燃烧室内也无碰撞痕迹,气门、气门弹簧,锁片都符合要求,又打开油底壳抽出活塞,检查活塞连杆组和机油泵,还是没有发现问题。最后,对配气机构机件仔细检查,发现三缸排气门推杆有轻微弯曲,且推杆底部球 There is a normal driving Beijing BJ212 jeep, the driver to maintain the carburetor and replace the engine oil, the engine issued an unusual noise, and in low, medium, high speed have this sound. According to the characteristics of the sound, the judge may be maintenance carburetor fell into the foreign body caused. Open the cylinder head to check the cylinder is no foreign body, no signs of collision within the combustion chamber, valves, valve springs, lock pieces are in line with the requirements, and open the oil pan out of the piston, check the piston rod set and the pump, or did not find the problem. Finally, the valve train parts carefully examined and found that three-cylinder exhaust valve putter slightly bent, and the bottom of the putter ball