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A key component of your Yanmar marine engine, the marine injector sprays diesel fuel at very high pressure directly into the combustion chamber. Over many hours of cruising, wear is often gradual: combustion slowly deteriorates before turning into a real breakdown. DAM Marine offers a complete range of genuine Yanmar and high-quality replacement injectors and seals to restore your engine's full performance.
A mechanical injector is not just a simple spray hole: it is an ultra-precise valve that opens at a specific pressure, known as the calibration or opening pressure. This threshold ensures an extremely fine diesel mist and perfect injection timing.
Over time, the internal spring weakens and the opening pressure drops. The result? Diesel dribbles or forms large droplets that burn poorly. Because the engine keeps running, this fault often goes unnoticed at first. To preserve the engine's perfect balance, it is strongly recommended to replace all injectors at the same time on a multi-cylinder block.
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You can gently clean the outside of the nozzle, meaning the carbon deposits, with a brass brush, but never touch the spray holes. Fuel additives are excellent preventive products to limit fouling, but they will never repair a weakened spring or a scratched needle.
It is not mandatory, but inspect them carefully. If the conical seats, meaning the pipe ends, are marked, or if the pipe was twisted during a previous dismantling, it will leak. Never force or bend them to make installation easier.
Several warning signs should alert you to the condition of your injection system:
A bench test at a diesel specialist can check and adjust the calibration, using shims, if the injector body is still in good condition.
However, replacement with a new part is the safest and often the most cost-effective solution if your engine has many hours. Once the needle is marked, the nozzle is too carboned up or the body shows corrosion, repair becomes obsolete. Starting again with a new genuine Yanmar set ensures reliability for the coming seasons.
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