一台BJ632A旅行客车,发动机经大修竣工后试车,运转几分钟后可视3、4缸排气歧管发红,红得似电热丝。经试验能将报纸、香烟点燃,但1、2缸排气歧管温度正常无异样。 是何缘故导致排气歧管温度过高发红? 一般认为是配气机构所致,虽然曲轴正时齿轮与凸 A BJ632A travel passenger car, engine overhaul completed after the test run, visual 3,4-row exhaust manifold after a few minutes running red, red like heating wire. The test can be newspapers, cigarettes lit, but the normal temperature of 1,2 cylinder exhaust manifold without exception. What causes the exhaust manifold temperature is too red? Generally considered to be caused by the valve mechanism, although the crankshaft timing gear and convex