The multi-cylinder engine motorcycle has advanced performance and complex structure. At present, there are few reference materials. When the engine fails, it is often difficult to maintain.
1, fault inquiry and test before dismantling
Any motorcycle will break down, and when it does, there are signs and signs. Before repair, maintenance personnel should be like the doctor to the patient, to the owner of the car carefully asked the omen of the failure of the vehicle, the external performance, may cause the failure and the owner ignored the relevant factors, such as what happened before the vehicle and the elimination situation. Any negligence may bring a lot of unnecessary trouble to the maintenance work. After asking clearly, maintenance personnel must personally test the car, hand touch, ear listening, eyes, nose and smell, and repeatedly experience the fault phenomenon and fault characteristics of the vehicle.
2, grasp the main fault factors, determine the parts to be removed
Motorcycle faults are complex and diverse, especially motorcycles with multi-cylinder engines. There are often many factors leading to the same fault, and the factors interact and influence each other. The fault is not easy to be accurately diagnosed and completely eliminated. For this fault, maintenance personnel should not rush to dismantle the vehicle. First of all, according to the personal test experience, combined with the introduction of the owner, summarize all the relevant factors that may cause this kind of failure, draw the causal relationship diagram. Consider the relevant factors in the diagram, grasp the main cause factors, determine the fault location, determine which parts need to be disassembled for inspection.
3. Make good records of car dismantling
According to the principle of "outside before inside, easy before difficult", the cars are dismantled in order. For motorcycles whose structure is not very familiar, parts are recorded in the order of dismantling, including adjusting the assembly position of small parts such as washers. Assembly diagrams should be drawn for parts with complex assembly relationships.
4, the parts with the same name do coloring marks
There are many parts with the same name in the heat engine part of multi-cylinder engine. Although these parts with the same name seem to have the same structure, shape and size, the wear and deformation of the parts with the same name cannot be consistent after the motorcycle is used for a long time. As a cylinder of two exhaust valve wear is not consistent, if the two exhaust valve after assembly, exhaust valve and exhaust valve seat is difficult to seal reliably. Therefore, the parts with the same name should not be exchanged as much as possible. The parts with the same name of the same cylinder shall be colored and marked, and the parts with the same name removed from different cylinders shall be placed separately.
5, mark the valve timing
The distribution system of multi-cylinder engine is one of the most complex and critical systems of the engine. The marking methods of the distribution timing of different engines are often different, and the distribution timing and ignition timing are coordinated and unified. If any adjustment is wrong, the engine will not work normally. For not very familiar models, valve mechanism before disassembly, to explore clear valve timing and ignition timing mark meaning and proofreading method. If the mark is not on or unclear, make a mark and then disassemble it.
6. Loading requirements
After troubleshooting, the vehicle shall be loaded in reverse sequence according to dismantling records, coloring marks and valve timing. During assembly, the engine cooling channel, oil channel, airway and sealing surface shall be sealed, scale, oil scale and carbon deposit shall be cleaned, and air discharge in cooling channel and hydraulic brake pipeline shall be clean, etc.
In short, the structure of multi-cylinder engine motorcycle is complex, the current reference is not much, the repair is difficult, maintenance can not rush to success, blind disassembly, should be good at analysis, safe method, careful handling.
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