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Jan Attenstedt and Nigel Calder discuss whether to perform a 2,000-hour service on a Yanmar 4JH4TE 75-horsepower engine.0:13 The manufacturer recommends removing and inspecting the fuel injectors and injection pump at this interval.0:21 The engine owner reports that the unit currently runs efficiently, starts reliably, and consumes no oil.0:29 Calder advises against the invasive procedure if the engine shows no performance issues, noting that manufacturer service intervals are often arbitrary and depend heavily on the specific duty cycle of the engine.1:07 He warns that removing and reinstalling these components introduces the risk of human error, such as improper pump timing, which can lead to unintended mechanical consequences.1:30 Calder suggests maintaining the current routine service schedule and only addressing the fuel system if specific symptoms of failure emerge.1:41 The primary takeaway is that preventive maintenance on fuel injection systems should be driven by performance indicators rather than strictly adhering to manufacturer-recommended hour intervals when the engine is operating correctly.

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