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Routine maintenance for a Yanmar 3JH marine inboard engine includes changing the oil, replacing the oil and fuel filters, swapping the impeller, and tensioning the alternator belt.0:11 To drain the oil, use a manual pump inserted into the dipstick tube to extract approximately 5 liters.0:47 When replacing the oil filter, smear a small amount of clean oil on the new gasket to ensure a proper seal, and tighten it by hand to avoid over-tightening.3:32 Before removing the impeller, close the engine raw water intake to prevent flooding.4:38 Lubricate the new impeller with the provided grease and ensure the vanes are oriented for clockwise rotation.4:45 After replacing the fuel filter, fill it with clean diesel to minimize the need for manual bleeding.6:48 Bleed the fuel system by opening the bleed screw on the filter housing and pumping until air-free fuel emerges.7:28 Adjust the alternator belt tension by loosening the mounting bolts on the slotted adjustment bar, aiming for a maximum deflection of one centimeter under finger pressure.7:22

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