Automotive Motor troubleshooting method

Trouble phenomenon: When driving an Automotive Motor, sometimes the engine can be started by running, and sometimes the engine cannot be started by not running.

　　Troubleshooting:
　　 The failure phenomenon is that when the Automotive Motor is turned on, sometimes the Automotive Motor can start the engine; sometimes it does not turn. When the Automotive Motor is not rotating, its electromagnetic switch has a "click, click" sound.
　　 When overhauling, first check the battery to make sure it is fully charged. Then remove the Automotive Motor from the engine and disassemble it for inspection. During inspection, it was found that its four brushes were excessively worn, and there were obvious burn marks on the surface of the commutator. Due to the poor contact between the brushes and the commutator, the failure of the Automotive Motor to turn when it is not turning is caused. Repair the surface of the commutator with a lathe, then replace four new brushes, repair the Automotive Motor and install it for testing. At this time, the Automotive Motor is turned on, and the Automotive Motor drives the engine normally, and the engine also runs smoothly. The fault is completely eliminated.

　　 The failure phenomenon is the same. When the Automotive Motor can't rotate normally, it shows a decrease in power.
　　 When overhauling, first check the battery to make sure it is fully charged. Then the Automotive Motor was removed from the engine. During the disassembly process, it was found that the front sliding bearing of the Automotive Motor had come out of the bearing hole on the rear scoop of the engine. The Automotive Motor rotor loses support due to damage to the front bearing, resulting in a decrease in the sweeping power of the rotor, so sometimes it is unable to drive the engine.

　　 Take a new copper sliding bearing, inlay it in the bearing hole on the rear scoop of the engine according to the process requirements, and then put the Automotive Motor for routine maintenance and loading test. At this time, the Automotive Motor is turned on, and the Automotive Motor drives the engine normally, and the engine also runs smoothly. The fault is completely eliminated.

　　 The failure phenomenon is the same. When the Automotive Motor is not running, there is no "click, click" sound of the electromagnetic switch.
　　 When overhauling, first check the battery to make sure it is fully charged. Locate the Automotive Motor solenoid switch drive line on the right side of the battery in the cabin, and disconnect its connector. Connect the solenoid switch drive line directly from the battery to the ignition wire, and the Automotive Motor drives the engine normally at this time. The preliminary judgment may be that the contacts of the ignition switch start gear are sometimes in poor contact and cause the above failures. After installing a new ignition switch, and then turning on the Automotive Motor, the Automotive Motor fully restored its normal functions. The fault is completely eliminated.

　　 The failure phenomenon is the same. The symptoms are irregular.
　　 During the overhaul, first check the battery to confirm that it is fully charged. Then remove the Automotive Motor from the engine and disassemble it for inspection. During the disassembly process, it was found that there were nylon scraps in the machine. Careful observation revealed that the support frame of the nylon shift fork was broken. Since the support frame is in the mounting hole, it can maintain its original shape even if it is broken when it is not disassembled, but sometimes it loses its support function, which causes the above-mentioned failure.

　　 Take a new fork assembly to repair the Automotive Motor, and then install it for testing. At this time, the Automotive Motor is turned on, and the Automotive Motor drives the engine normally, and the engine runs smoothly. The fault is completely eliminated.
　　 The failure phenomenon is the same. However, the obvious symptom is that the electromagnetic switch is sucked and reapplied and frequently moves when the Automotive Motor is used.

　　 During the overhaul, first check the battery to confirm that it is fully charged. Then remove the Automotive Motor from the engine. Analyze from the fault phenomenon the suction and pull coil of the electromagnetic switch works normally; while the holding coil works abnormally. The electromagnetic switch was removed from the Automotive Motor, and it was tested that it kept the coil open. Take a new electromagnetic switch and install it on the Automotive Motor, and then install the Automotive Motor on the car for testing. Call Automotive Motor at this time. The Automotive Motor drives the engine normally, and the engine runs smoothly. The fault is completely eliminated.