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经大修后的发动机即使更换了新件,如不重视以下部位的检查,将很难达到大修的目的。 (1)压缩余隙 如更换了活塞、连杆、缸体等部件或磨修曲轴后,在未安装气缸盖前,应检查活塞凸出量。根据活塞凸出量值的大小,估算出压缩余隙的大概值。安装气缸盖后。必须进行压缩余隙的测量(可在喷油嘴安装孔处检查)。压缩余隙过大时,将使燃烧室容积增大,压缩比降低,导致燃烧不好,工作无力;压缩余隙过小,将造成活塞顶撞气缸
After the overhaul of the engine even if the replacement of new parts, if you do not attach importance to the following parts of the inspection, it will be very difficult to achieve the purpose of overhaul. (1) Compressed clearance If piston, connecting rod, cylinder block or other parts are replaced or grinding crankshaft, check the amount of piston protrusion before installing the cylinder head. According to the size of the piston bulge, estimate the approximate value of compression clearance. After installing the cylinder head. Compression clearance must be measured (check at nozzle mounting hole). Compression clearance is too large, it will increase the volume of the combustion chamber, reducing the compression ratio, resulting in poor combustion, work weakness; compression clearance is too small, will cause the piston against the cylinder