There are three methods for identifying old and new diesel engines
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To determine the age and condition of an old diesel engine, you can follow a systematic approach that includes asking questions, visually inspecting the engine, and performing a few basic tests. This method helps you assess whether the engine is still in good working order or if it may need significant repairs.
First, ask questions. Inquire about when the engine was purchased, how long it has been in use, the reason for selling, any previous repairs, and which major components have been replaced. Also, ask about any ongoing issues or problems during operation. This gives you a better understanding of the engine's history and potential hidden flaws.
Second, take a close look. Check the model to see if it's an outdated or obsolete version. Examine the exterior for signs of wear, rust, or damage. Make sure all parts are present and in good condition—missing or damaged components can indicate poor maintenance or serious issues.
Third, perform a few simple tests. Start by manually cranking the engine to check fuel delivery to the injection pump. If the fuel injectors produce a clear, sharp sound, it suggests that the plunger and nozzle are functioning properly. A quiet gear chamber indicates minimal wear on the gears.
Next, move the flywheel up and down. If there’s no unusual noise or shaking, it means the main crankshaft bearings are in good condition. When rotating the flywheel, if there’s no squeaking, it shows that the connecting rod journals are not excessively worn.
Then, decompress the cylinder and crank the engine. If the piston rebounds strongly and the flywheel spins quickly, it means the cylinder liner, piston, and piston rings are in good shape. At this point, the oil pressure gauge should read at least 1 bar, and the oil buoy should rise quickly. Manual pressure testing should feel challenging.
Finally, try starting the engine. If it starts easily, emits colorless or light gray exhaust, runs smoothly without noise, and maintains stable RPM, it’s a sign that the engine is in excellent technical condition.
By following these steps, you can effectively evaluate the quality of an old diesel engine. This thorough assessment ensures that you can accurately determine its value before making a purchase decision.