Diesel engine Q&A

The relationship between power, torque, and speed for non-road diesel engines is governed by the following formula, established under ISO 15550.### The Standard FormulaThe relationship is defined by the equation for mechanical power:P = (T × N) / 9,550Where: P = Power (kW) | T = Torque (N·m) | N   Read More>

Based on ISO standards and international engineering practice, the definitions and conversions for engine power units are as follows.### ⚙️ ISO Definitions of Power UnitsThe SI (International System of Units) unit for power is the Watt (W), with kilowatt (kW) being the most commonly used multiple in   Read More>

1. 40Cr (Induction Hardened)· Physical Properties & Microstructure:· Base Condition: Quenched and tempered (Tempered Sorbite), hardness 270–300 HB.· Surface Hardening: Induction hardening + low-temperature tempering, surface hardness 42–48 HRC.· Case Depth: Approx. 2–3 mm (deep, compressive residual   Read More>

I. Core Recommendation- When a motor fails, it is recommended to replace the entire motor rather than replacing only the rotor or stator separately.II. Reason Analysis1. Motor Construction Differences: - Motors from different manufacturers vary in the number of coil turns and materials used. - The   Read More>

I. Problem Overview- The engine starting motor frequently fails, and users generally believe it is a quality issue. In reality, usage habits have a significant impact on the motor's lifespan.II. Starting Motor Parameters- The current is high at the moment of startup, ranging from tens of amperes to   Read More>

What is valve clearance?The gap between the valve stem and rocker arm (or tappet) when the valve is fully closed.Why adjust it?· Ensure proper sealing of combustion chamber.· Prevent power loss and overheating.· Reduce wear and noise from valve train components.When to adjust?· As specified in the e   Read More>

1. Faulty AVR (Automatic Voltage Regulator): The AVR fails to supply or control the DC current needed to create the rotor's magnetic field.2. Brush/Wearing Issues (if applicable): Worn-out, stuck, or dirty brushes prevent excitation current from reaching the rotor.3. Failed Rotating Diodes (if appli   Read More>

Maintaining the three filters (air, fuel, oil) is crucial for the performance and longevity of a small diesel generator.1. Air Filter· Function: Protects the engine by trapping dust, dirt, and debris from the intake air.· Consequences of Neglect: A clogged filter restricts airflow, causing: · Loss o   Read More>

For small, air-cooled, single or twin-cylinder diesel engine using splash lubrication in winter conditions, the core principle is: Prioritize cold-start performance while maintaining adequate high-temperature protection.1. The Key Metric: Oil Viscosity Grade (e.g., 15W-40)This is the most critical f   Read More>

Focus on these key factors:1. Application: What is the primary task? (e.g., flood drainage, irrigation, construction dewatering).2. Performance: Match the pump's Flow and Head to your job's requirements.3. Engine: Look for a reliable, air-cooled diesel engine, like Siwei Power:)4. Solid Construction   Read More>