S195柴油机气门座的一般使用寿命在1500小时以上。可是有的机手和修理工却随意更换,有的机车一年更换两次以上。当然,如果由于空气滤清器长期不保养,柴油机长期烧机油等原因,使气门座磨损严重,或气门座密封环带上烧出麻点,经铰修后,气门下陷量超过规定值1.8毫米时,是必须更换的,否则,就没有必要更换气门座。随便更换气门座,不仅降低其使用寿命,而且 S195 diesel valve seat of the general service life of more than 1,500 hours. However, some mechanic and repairman are free to change, and some locomotives more than twice a year. Of course, if the long-term maintenance of the air filter, diesel engine long-term burning oil and other reasons, the valve seat wear serious, or valve seat sealing ring with a burning pockmarked, the hinge repair, the valve sag exceeds the required value of 1.8 mm When it is necessary to replace, otherwise, there is no need to replace the valve seat. Just replace the valve seat, not only reduce its service life, but also