1. The climate is cold. When the temperature drops below 0°C, it can be very difficult to start a diesel engine, even if all its components are in good condition. In such conditions, preheating the engine is essential before attempting to start it. This can be done using a block heater or a preheater, which helps warm up the engine and makes the starting process smoother.
2. The timing of fuel supply is crucial. If the diesel fuel is injected too late when starting a cold engine, the fuel may mix with air and exit as a milky white substance, making it hard for the engine to ignite. On the other hand, if the fuel is supplied too early, the engine might experience backfiring when cold, but it could fail to start when hot. Proper timing adjustment is necessary to ensure smooth operation in all conditions.
3. Excessive valve clearance or poor decompression can lead to difficulties in starting. If the clearance between the valves and their seats is too large, it can cause improper sealing and reduce compression, making the engine harder to turn over. This results in a heavy crankshaft feel and difficulty reaching the required starting speed. Regular maintenance and proper adjustment of valve clearance are important to prevent this issue.
4. Worn-out plunger parts in the injection pump can cause irregular performance, especially at low speeds. While the engine may run smoothly at higher speeds, it might lack power and emit no smoke when operating at low RPMs. This is a clear sign of wear in the injection pump's plunger assembly. The best solution is to replace the affected components to restore proper fuel delivery and engine performance.
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