The overhaul of diesel generator set internal combustion engine is a restorative repair. It is mainly to restore the power performance, economic performance and fastening performance of diesel generator set internal combustion engine, ensure the integrity of diesel generator set internal combustion engine and extend its service life.
The timing of diesel generator set internal combustion engine overhaul is generally determined according to the specified working hours and technical conditions. The working hours of internal combustion engine overhaul of different diesel generator sets are also different, for example, the first overhaul period of 4135 diesel engine is 6000h. This time is not unchangeable. For example, due to improper use and maintenance or poor working conditions of diesel generator set internal combustion engine (dusty, often working under overload, etc.), it may not be able to continue using before reaching the working hours. Therefore, when determining the overhaul of diesel generator set internal combustion engine, in addition to the number of working hours, the following overhaul conditions should also be considered.
① The internal combustion engine of the diesel generator set is unable to work (the speed drops greatly after loading, and the sound changes suddenly), and the exhaust emits black smoke.
② It is difficult to start the internal combustion engine of diesel generator set at normal temperature, and there is knocking noise on the crankshaft bearing, connecting rod bearing and piston pin after heating.
③ When the temperature of the internal combustion engine of the diesel generator set is normal, the cylinder pressure cannot reach 70% of the standard pressure.
④ The fuel and oil consumption rate of diesel generator set internal combustion engine has increased significantly.
⑤ The out-of-roundness and taper of the cylinder, the clearance between the piston and the cylinder, and the out-of-roundness of the crankshaft journal and connecting rod journal exceed the specified limits.
The basic contents of diesel generator set include: repair or replacement of crankshaft, connecting rod, cylinder liner, valve seat and valve guide. Repair the eccentric bearing. Replace the plunger pair, oil outlet valve pair and needle valve pair. Repair and weld the oil pipe and joint. Repair and replace the water pump and governor, and remove the scale in the water jacket. Check, repair and adjust the lines, instruments, charging generators and starting motors in the power supply system. Install, inspect, test and adjust all systems, and conduct load test run.
During the overhaul of diesel generator set internal combustion engine, its main components shall be repaired, and the whole engine shall be decomposed into assemblies, assemblies, assemblies and parts, which shall be inspected and classified, and thoroughly inspected, repaired and reassembled according to the repair technical conditions.
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