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A Yanmar 4JH4TE diesel engine on a cruising sailboat failed to exceed 2,000 RPM and emitted heavy gray-black smoke under load.1:04 The host diagnosed the issue as a seized or carbon-fouled turbocharger after confirming the exhaust mixing elbow was clear.1:58 During the removal process, the host accidentally broke a high-pressure air port on the turbo housing, requiring professional repair at a local shop.21:02 After cleaning the carbon deposits from the turbine blades and reinstalling the unit with new gaskets, the engine successfully reached higher RPMs and the turbocharger resumed audible operation.29:49 Separately, the host installed an Arco Zeus external alternator regulator, which provides Bluetooth monitoring and multi-stage charging profiles for lithium batteries.5:53 The installation required wiring temperature sensors for the battery and alternator, though the host noted the existing alternator overheats due to poor engine bay ventilation.3:46 Replacing the throttle control cables also improved shifting performance.30:21 Cleaning carbon buildup from a turbocharger and ensuring proper gasket seals can restore engine power and eliminate exhaust smoke.

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