Troubleshooting Starting Issues on IHI 35J

[MikePhua]

The IHI 35J is a compact, reliable machine used in construction and heavy equipment operations. However, like any piece of machinery, it can experience starting issues that may hinder its performance. If your IHI 35J won’t start, this guide can help you diagnose and resolve common problems.
Common Causes for Starting Issues

1. Battery Problems
   • Battery Charge: A weak or dead battery is often the most common cause for starting issues. Check the battery voltage using a multimeter. If it’s low, try jump-starting the machine or replace the battery if necessary.
     
   • Corroded Terminals: Battery terminals can accumulate corrosion, preventing proper electrical flow. Clean the terminals and reconnect them securely.
     
2. Fuel System Issues
   • Fuel Quality: If the machine hasn’t been used for a while, old or contaminated fuel can cause starting problems. Drain the old fuel and replace it with fresh diesel or the required fuel for the engine.
     
   • Clogged Fuel Filter: A clogged or dirty fuel filter can obstruct fuel flow, making it difficult for the engine to start. Replace the fuel filter if necessary.
     
   • Fuel Pump Malfunction: The fuel pump is responsible for transferring fuel from the tank to the engine. A malfunctioning pump can result in no fuel reaching the engine. If you suspect a problem with the fuel pump, it may need to be replaced or repaired.
     
3. Electrical System Failures
   • Ignition Switch: A faulty ignition switch can prevent the machine from starting. Inspect the ignition switch for wear and ensure it’s functioning properly.
     
   • Starter Motor: The starter motor is responsible for cranking the engine. If the engine doesn’t crank when you turn the key, the starter motor could be faulty. You can test the starter by bypassing the ignition switch or checking the starter relay and solenoid.
     
   • Fuses and Relays: A blown fuse or faulty relay can prevent the machine from starting. Check the fuses and relays related to the starting circuit, and replace any that are faulty.
     
4. Engine Sensors and Wiring
   • Crankshaft Position Sensor: If the crankshaft position sensor is faulty, the engine may fail to start. This sensor helps the engine control unit (ECU) determine the position of the crankshaft. If the sensor fails, it may prevent the engine from firing. Inspect the sensor and wiring for damage or wear.
     
   • Wiring Issues: Loose or damaged wiring can disrupt the starting process. Inspect all wiring, especially around the starter and ignition system, for any visible signs of damage or wear.
     
5. Starter Solenoid Issues
   • Solenoid Failure: The solenoid is responsible for engaging the starter motor when the ignition is turned on. If the solenoid is faulty, it won’t send the signal to the starter motor, preventing the engine from cranking. Check the solenoid and replace it if needed.
     
6. Engine Compression Issues
   • Low Compression: Engine compression is crucial for starting. If the engine has low compression due to worn-out piston rings or valve issues, it can cause difficulty in starting. Conduct a compression test to verify the engine’s health. Low compression will require engine repairs or a rebuild.
     
7. Air Intake Blockage
   • Dirty Air Filter: A clogged or dirty air filter can restrict airflow into the engine, making it difficult for the engine to start. Inspect the air filter and replace it if necessary.
     
   • Blocked Air Intake: Check the air intake system for any obstructions. Ensure there are no blockages in the intake manifold, pipes, or air filter housing.
     

Step-by-Step Troubleshooting

1. Check the Battery
   • Start by testing the battery voltage. If the voltage is below the recommended level, try charging the battery. If the battery is old or damaged, it might need replacement.
     
   • Clean the battery terminals and ensure the cables are properly connected.
     
2. Inspect the Fuel System
   • Drain any old or contaminated fuel from the tank. Refill with fresh fuel and check the fuel filter for clogging. Replace the fuel filter if necessary.
     
   • Inspect the fuel pump for any signs of malfunction. If the pump isn’t functioning correctly, it will need to be repaired or replaced.
     
3. Examine the Electrical System
   • Inspect the ignition switch for any faults. Test the starter motor by bypassing the ignition switch. If the starter doesn’t engage, check the starter relay and solenoid for defects.
     
   • Replace any blown fuses and ensure all electrical components are in working order.
     
4. Inspect Engine Sensors and Wiring
   • Check the crankshaft position sensor for damage. Inspect wiring connections, especially around the starter and ignition system.
     
   • If you suspect faulty wiring, repair or replace the damaged sections.
     
5. Test the Starter Solenoid
   • Check the starter solenoid for proper operation. If the solenoid is faulty, it will prevent the starter from engaging. Replace the solenoid if necessary.
     
6. Verify Engine Compression
   • Conduct a compression test to check for low compression in the engine. If compression is low, further engine diagnostics or repairs may be necessary.
     
7. Check the Air Intake System
   • Inspect the air filter and replace it if it’s clogged or dirty. Ensure the air intake system is free of obstructions that could impede airflow to the engine.
     

Conclusion
Starting issues with the IHI 35J can arise from a variety of causes, including problems with the battery, fuel system, electrical components, and more. By systematically checking each system and following the troubleshooting steps, you can identify and resolve the issue. If these solutions do not solve the problem, it may be necessary to consult a professional technician for further diagnostics and repairs. Regular maintenance is key to preventing these issues from arising and ensuring your IHI 35J runs smoothly for years to come.