Aviation piston engine start-up troubleshooting points
The main points of troubleshooting aviation piston engine start-up failure are as follows:
First, electrical system check
Battery inspection
Check that the battery voltage is sufficient, usually the battery voltage should be within the specified range (such as 12V or 24V systems).
Check whether the battery connection is firm, whether the electrode joint is clean, and whether there is corrosion or loosening.
Use a multimeter to measure the internal resistance of the battery to determine whether the battery performance is good.
Ignition system inspection
Check whether the ignition coil, spark plug and other components are working properly.
Use a high voltage tester to check whether the spark plug can produce enough high voltage sparks.
Check that the primary and secondary winding resistance of the ignition coil is normal.
Check whether the pulse coupling, distributor, contact and other components of the magneto (such as equipment) are working properly.
Starting circuit check
Check whether switches, relays, fuses and other components in the starting circuit are working properly.
Use a multimeter to measure the voltage and current in the starting circuit and determine whether there is a short circuit or open circuit.
Check whether the connection wire and plug in the starting circuit are in good contact and whether there is loosening or corrosion.
Second, fuel system check
Fuel pump inspection
Check whether the fuel pump can work normally and whether the output pressure meets the requirements.
Use the fuel pressure gauge to check the output pressure of the fuel pump.
Check whether the drive motor or mechanical parts of the fuel pump are working properly.
Fuel filter check
Check the fuel filter for blockage and clean or replace it if necessary.
Check whether the fuel filter is installed correctly and whether there is leakage.
Fuel line inspection
Check fuel lines for blockage or leakage to ensure that fuel can be supplied to the engine.
Use a flashlight or an endoscope to check the inside of the fuel line.
Check whether the fuel line connection is firm, whether there is loosening or corrosion.
Third, mechanical system investigation
Cylinder compression force check
Check whether the compression force of the cylinder is enough, usually it should reach a certain standard value (such as 120 to 160 psi).
Use the cylinder pressure gauge to test the cylinder compression force.
Check the sealing of the cylinder, such as the cylinder gasket, piston ring and other components are intact.
Piston, connecting rod, crankshaft inspection
Check whether the piston, connecting rod, crankshaft and other parts are working properly, and whether there is wear or damage.
Use vernier calipers, micrometers and other tools to measure the size and shape of the parts.
Check whether the connection between the components is firm, and whether there is loosening or breaking.
Starting device check
Check whether the starting motor can work normally and whether the output torque meets the requirements.
Measure the output torque of the starting motor using a torque wrench.
Check whether the starting gear meshes well with the flywheel tooth ring and whether there is wear or damage.
Fourth, other investigation points
Air intake system check
Check whether the air filter is blocked and clean or replace it if necessary.
Check whether the inlet is unimpeded and whether there is blockage or leakage.
Cooling system inspection
Check that the cooling system is working properly to ensure that the engine temperature is moderate.
Check whether components such as the water pump, heat sink, and cooling fan work properly.
Check whether the coolant level and concentration meet the requirements.
Operating procedure check
Check that the operator is following correct operating procedures, such as start-up procedures, fuel supply, cooling system, etc.
Check that the operator is familiar with the performance and characteristics of the engine and can correctly respond to various abnormal situations.
Fifth, troubleshooting process
Preliminary inspection
Observe the phenomena in the engine starting process, such as starting time is too long, starting failure, etc.
Listen to the sound of the engine when it starts and determine whether there is an anomaly.
Check engine instrument indicators, such as tachometer, oil pressure gauge, etc., are normal.
System check
Based on the results of the preliminary inspection, the possible failure system (e.g. electrical system, fuel system, mechanical system, etc.) is identified.
Check the faulty system in detail according to the above troubleshooting points.
Fault location
Determine the faulty component or location based on the system troubleshooting result.
Use professional inspection tools and equipment to further verify the faulty part or location.
Fault handling
Based on the fault location, take corresponding measures, such as replacing the faulty component, cleaning or replacing the filter, and adjusting system parameters.
Follow the safety regulations to ensure the safety of the human body and the device.
Trial verification
After dealing with the fault, test verification is carried out to ensure that the engine can start and run normally.
Observe the phenomenon and sound of the engine starting process to determine whether there is an anomaly.
Check the engine instrument indication is normal, to ensure that the parameters meet the requirements.
Through the inspection and treatment of the above points, the problem of starting the aviation piston engine can be effectively solved to ensure the normal operation of the engine.
