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一台495A型柴油机(上海50型拖拉机动力),我们对其进行了大修:修磨了曲轴,并配了合适的主轴瓦和连杆瓦,主轴瓦加0.25毫米,连杆瓦加0.50毫米;修镶了气门口,换了新气门、气门导管、新气缸垫及新的活塞环(上海活塞环厂生产)。安装后试车,并没发现异常现象。可大约使用了十天,发现发动机烧机油,并从排气管向外喷,而且一天比一天严重。当时,由于农忙,我们没有及时修理,只好让它带病工作。又过二十天发现每
A 495A diesel engine (Shanghai 50 Tractor Power) was overhauled: the crankshaft was sharpened and fitted with a suitable mainshaft and connecting rod, plus 0.25 mm for the mains and 0.50 mm for the connecting rod, Repair of the valve opening, for a new valve, valve guides, new cylinder pads and a new piston ring (Shanghai Piston Ring Factory production). After the installation test, did not find abnormalities. It took about 10 days to find that the engine had burnt the oil and spurted it out of the exhaust pipe and was getting worse day after day. At that time, due to busy farming, we did not promptly repair it and we had to let it work sick. Another twenty days found each