Daedong Marine Diesel Maintenance Schedule

Daedong Marine Diesel Maintenance Schedule DD6CE. Serviced by trained technicians at
805 Marine Diesel Mechanic, supporting Ventura, Oxnard,
Channel Islands Harbor, and Santa Barbara Harbor. Our mobile, dockside team follows the factory Daedong schedule and adapts it to local saltwater conditions so your engine runs cooler, cleaner, and longer.

Below you’ll find your original Daedong DD6CE hourly schedule—kept intact—followed by practical guidance that explains what each interval covers, plus pro tips for Ventura and Channel Islands waters, a short note on customization, and a fast way to book service.

Daedong Marine Diesel Maintenance Schedule:

Daily.

• Drain fuel /water Seperator (Racors)
• Cooling System Coolant Level – Check.
• Engine Air Cleaner Service Indicator – Check
• Engine Oil Level – Check.
• Marine Transmission Oil Level – Check.

250 hrs or yearly whichever comes first.

• Primary fuel filter element – Replace.
• Secondary fuel filter element – Replace.
• Engine Oil & Oil Filter – Change
• Raw water pump impeller – Replace.
• Raw water pump Seal – Check the state of wear of the seawater pump rotor. Replace if necessary.
• Descale/Flush Raw water System components. Check seawater/engine oil heat exchanger, seawater/engine coolant heat exchanger and intercooler heat exchanger (air-seawater). Clean if necessary
• Check zinc anode wear; replace (4) if necessary. In warm and very salty waters such as the Mediterranean, please check anodes every 6 months.
• Engine Coolant – Check.
• Check the condition of the air filter, Clean and replace if necessary.
• Turbo Charger – Inspect & Wash.
• Exhaust/Raw water Mixing Elbow – Inspect/Clean.
• Serpentine Belt – Inspect/Replace if necessary.
• Belt Tensioner – Inspect/Replace.
• Fuel Tank – Drain (Strip) water condensation from bottom of tank.
• Check the condition of the oil vapor recirculation filter; replace the filter if necessary.
• Fault memory reading via diagnostics tool

500 Service Hours or yearly:

• Replace Raw water pump impeller.
• Inspect Raw water pump Seals.
• Replace Zinc Anodes
• Descale/Flush Raw water System components.
• Replace Engine Coolant.
• Clean Intake Silencer Element (Air Filter)
• Inspect & wash Turbo Charger.
• Replace Rubber Hoses as needed.
• Replace Exhaust/Raw water Mixing Elbow.
• Inspect wire connections.
• Drain (strip) fuel tank. Check for signs of condensation inside the fuel tank. Clean if necessary.
• oil vapor recirculation filter: replace.
• Check auxiliary belt (V belt) (alternator and engine cooling water pump).
• Replace fuel filter element.
• Change Engine Oil & Filter.

750hrs or 2 years whichever comes first.

• Replace fuel filter element.
• Change Engine Oil & Filter.
• Replace Raw water pump impeller.
• Replace Zinc Anodes.
• Replace Engine Coolant.
• Replace Intake Silencer Element (Air Filter)
• Inspect & wash Turbo Charger.
• Inspect/Replace Serpentine Belt.
• Replace Rubber Hoses.
• Replace Exhaust/Raw water Mixing Elbow.
• Inspect wire connections.
• Descale/Flush Raw water System components. Check seawater/engine oil heat exchanger, seawater/engine coolant. heat exchanger and intercooler heat exchanger (air-seawater). Clean if necessary.
• Adjust Propeller Shaft Alignment.
• Replace Lagging of Turbocharger.
• Drain (strip) water condensation from bottom of fuel tank.

NOTE: These are Daedong Marine periodic maintenance recommendations strait out of the service manual.
Some of these seem excessive to me such as, Replacing Lagging of Turbocharger every 2 years. Here at
805 Marine Diesel Mechanic, we can customize your diesel engine’s periodic maintenance to fit your needs.

Smooth Sailing: The Ultimate Daedong Diesel Maintenance Guide

Your Daedong DD6CE is engineered for dependable power and low fuel consumption—but only if service is consistent. Below we translate the official checklist into plain language, so you know what’s being done and why it matters in Southern California waters.

Daily Checks (5-minute routine)

Draining Racors removes water before it reaches injectors; verifying coolant and oil levels protects the most expensive parts of the engine. Monitoring the air-cleaner indicator avoids power loss and soot buildup. A quick transmission level check catches leaks early.

250 Hours / Annual (protection & prevention)

This service resets filtration (fuel, oil, crankcase), renews the raw-water impeller, and descales heat-exchangers to restore cooling flow. We inspect the turbo and the mixing elbow, check belts/tensioners, and strip condensation from the tank—a leading cause of microbial growth.

500 Hours / Annual (depending on duty)

We repeat critical items and replace zincs, coolant, and elbows while cleaning the intake silencer and turbo. Electrical connections are cleaned and protected. If your boat idles often or tows, we may pull some 750-hour items forward.

750 Hours / 2 Years (deep refresh)

Beyond filters and fluids, this interval targets rubber (hoses, belts), alignment, and thermal components (lagging). We flush the entire raw-water circuit and verify that heat-exchangers and intercoolers are clean and pressure-tight.

Pro Checks We Add for Ventura & Channel Islands Waters

• Zincs & Strainers, More Often: Warm, saline water eats anodes faster; we recommend mid-interval inspections.
• Heat-Exchanger Scaling: We use approved descalers and confirm flow/ΔT (temperature drop) after cleaning.
• Oil Sampling (optional): Trend wear metals, soot, and fuel dilution to right-size your oil interval.
• Battery Load & Voltage Drop: Prevent no-start events and alternator issues before a long run.
• Sea-Trial / Berth-Trial: Verify WOT RPM, temps, boost, and exhaust backpressure under load.

Fuel, Cooling & Reliability Tips

Fuel System

• Keep tanks topped after trips to minimize condensation and water in fuel.
• Use biocide and stabilizer for seasonal layups; log treatment dates in your engine room log.
• Upgrade filtration if you cruise offshore frequently—see our
  Fuel Filter System Upgrade.

Cooling & Exhaust

• Replace pressure caps when weak; low pressure raises boil-over risk.
• Inspect the mixing elbow for scale and corrosion—overheating often starts here.
• Always carry a spare raw-water impeller and gasket set on board.

Belts, Hoses & Electrical

• Replace aged hoses proactively—failure can be catastrophic and messy.
• Check belt dust around pulleys (slip sign); verify tensioner condition.
• Clean and protect electrical connectors with marine-safe dielectric products.

About 805 Marine Mechanic

805 Marine Mechanic is a veteran-owned mobile diesel service supporting Ventura Harbor, Channel Islands Harbor, Santa Barbara Harbor, and Oxnard. We specialize in scheduled maintenance, seawater system descaling, turbo and exhaust inspections, diagnostics, and reliability upgrades—performed in-slip with OEM-spec parts and fluids. Every visit includes clear notes, photos on request, and next-interval recommendations tailored to your hours and duty cycle.