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Performing a full service on a Nanni N4.65 marine diesel engine involves changing the oil, replacing oil and fuel filters, servicing the raw water cooling system, and inspecting the sacrificial anode. To change the oil, use the engine’s integrated pump to drain the crankcase through the front-mounted access point.1:37 When replacing the oil filter, lubricate the O-ring with oil and tighten it by hand to avoid damaging the threads.5:20 For the fuel system, isolate the Racor pre-filter and engine-mounted filter by closing the fuel supply and return valves to prevent air infiltration.8:17 Pre-filling new fuel filters with clean diesel reduces the time required to bleed the system.14:28 Inspect the Racor filter element for organic growth or debris, which indicates fuel contamination.9:38 Replace the raw water pump impeller by closing the intake seacock, removing the pump cover, and applying silicone grease to the new O-ring.19:59 Finally, remove the sacrificial anode from the exhaust elbow to check for corrosion, replacing it if necessary while ensuring the threads are greased but the anode surface remains clean.31:56 Regular maintenance and logging service dates prevent engine failure.

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