晋州市祁底村赵某有台装1105型柴油机的拖拉机，运转中排气冒黑烟，加负荷更严重。起初机手认为是柱塞、喷油头有问题，更换后仍然冒烟；又更换了缸套、活塞、活塞环，仍不见效。我被聘去修理，根据故障征象，冒黑烟肯定是燃烧不完全所致。造成燃烧不完全的原因，一是供油量过 Zhaoyang Village, Zhaozhou, Jinzhou City, has a tractor equipped with a 1105 diesel engine. During the operation, black smoke exhausts and the load is more serious. At first, the driver thought it was a plunger, there was a problem with the fuel injector, and the smoke was still emitted after the replacement. The cylinder liner, piston and piston ring were replaced and the result was still not effective. I was hired to repair, according to the signs of failure, black smoke must have been caused by incomplete combustion. Cause incomplete combustion reasons, one is the fuel supply too