Motorcycle engine is a complex mechanical system. In order to ensure convenient maintenance and safe disassembly and assembly, many assembly parts are equipped with positioning pins or limit snap springs.
This thing is inconspicuous, so many people ignore it, but in fact, as an indispensable accessory in a complex system, every detail has been finalized after thousands of trials, and has its own necessity.
Some repairmen said that these small parts are fine if they are not installed, and they will not affect the driving of the car. Is this really the case?
※※What will happen if the positioning pin is missing?
If the positioning pin of the cylinder is missing, it will cause partial wear of the cylinder, plug and ring, resulting in a decrease in engine power output, weak driving, unable to run at high speed, greatly increased fuel consumption, and more serious wear and tear, which will also cause misalignment of the cylinder gasket and cause oil leakage leak.
If the gear box positioning pin is missing, it will cause the box body to not fit properly, the main and auxiliary shafts will be misaligned, reduce the contact area of the gears, cause the oil leakage of the box body, and increase the wear of the gears.
If the positioning pin of the crankcase is missing, it will cause the power output of the crankshaft to be stuck, and the operation will be difficult, which will affect the power performance of the engine.
If the positioning pin between the multi-cylinder engine and the gearbox is missing, it will cause the starter motor to hit the teeth.
※※What will happen if the positioning pin is wrongly installed?
If the positioning pin is selected to be too long, it will affect the sealing performance of the relevant parts of the engine, causing oil leakage from the crankcase and gearbox, burning through the gasket between the cylinder head and the cylinder, difficulty in starting the engine, and driving weakness.
If the positioning pin of the cylinder head is too long, it will cause the cam to run loose, the noise will be loud, and the engine will be weak.
If the positioning pin is too thin or too small, the positioning function will be lost, resulting in various failures of missing positioning pins, resulting in the failure of the fixing screws to be tightened.
If the oil passage positioning pin is wrongly installed, or if it is too thick, it will block the oil passage, affect the lubrication effect, cause abnormal wear of the engine, and affect the engine life and power output.
In addition, the positioning pins have their own specifications, and the replacement needs to be strictly in accordance with the relevant standards, and the material cannot be changed at will, or put on and on!
