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Daihatsu
5LDK-20
The Daihatsu 5LDK‑20 is a 5‑cylinder vertical water‑cooled direct‑injection diesel engine delivering up to 925 kW at 900 rpm, capable of running on both marine diesel oil (MDO) and heavy fuel oil (HFO).
925.0 kW
Power
13,500 kg
Weight
MDO / HFO
Medium
Engine Specifications
5
Cylinders
200 mm
Bore
300 mm
Stroke
4-stroke
Stroke Type
Inspector Detail
▸
Common issues
- Cylinder liner wear, accelerated when running extensively on HFO
- Piston ring wear or sticking from carbon deposits
- Injector wear causing black smoke or uneven cylinder exhaust temperatures
- Turbocharger fouling reducing available power at rated rpm
- Governor or fuel rack linkage wear affecting speed control
- Jacket cooling water corrosion where inhibitor levels are not maintained
- Main/big-end bearing wear over extended service
Inspection checklist
- Check exhaust gas temperature spread between cylinders
- Inspect turbocharger for fouling and bearing condition
- Check cylinder liner bore for wear and scuffing
- Inspect piston rings and ring grooves at overhaul
- Check fuel injector spray pattern and opening pressure
- Verify jacket cooling water treatment and inhibitor concentration
- Sample crankcase lube oil for fuel/water contamination
- Check main and big-end bearing clearances at scheduled overhaul
- Test governor response and overspeed trip
- Inspect fuel rack and linkage for wear/free play
Service intervals
| Lube oil sample analysis | monthly |
| Lube oil and filter change | per maker specification and oil analysis trend |
| Fuel injector overhaul | every 4,000-6,000 running hours |
| Piston/liner inspection (top overhaul) | every 8,000-10,000 running hours |
| Main/big-end bearing inspection | every 10,000-14,000 running hours |
| Turbocharger overhaul | every 6,000-10,000 running hours, per maker interval |
Typical wear limits
| Cylinder liner wear | commonly limited to roughly 0.3-0.5% of bore diameter for this class of medium-speed trunk piston engine before renewal is considered - confirm the exact figure against Daihatsu's DK-20 manual |
| Piston ring end gap | wear limit is maker-specific for this bore/stroke - confirm against Daihatsu's manual rather than a generic figure |
| Main/big-end bearing clearance | typically a few tenths of a millimetre depending on journal size - confirm against the maker manual before condemning a bearing |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Fuel injector
- Piston ring set
- Cylinder liner
- Exhaust valve and seat
- Main bearing shells
- Big-end bearing shells
- Cylinder head gasket set
Safety
- High-pressure fuel injection system - a fine fuel jet can penetrate skin, never check for leaks by hand
- Hot exhaust manifold and turbocharger surfaces
- Rotating flywheel and coupling guards must be fitted before running
- Heavy fuel oil handling where fitted - burns and fire risk from hot HFO
- Crankcase pressure relief provisions must be kept clear and functional
Class survey
Main propulsion engines are Continuous Survey Machinery items; class attends crankshaft deflection readings, bearing clearance records and governor/overspeed trip tests at survey, with running hours since major overhaul reviewed where the vessel is enrolled in a Continuous Machinery Survey scheme.
Estimated lifetime:
Medium-speed trunk piston engines of this smaller bore class typically run to a major overhaul in the 20,000-28,000 running hour range, with overall engine life exceeding 80,000-100,000 hours through successive parts renewal - typical for this engine family.
Components & Design
Component data being added…
Technical Data
Type
Vertical water-cooling direct injection 4-cycle diesel engine
Mean Effective Pressure (Pme)
2.16-2.45 MPa
Piston Speed @ 900 rpm
9.00 m/sec
Piston Speed @ 720 rpm
7.20 m/sec
6DK-20e Dry Weight
16.0 tonnes (16000 kg)
5DK-20e Dry Weight
13.5 tonnes (13500 kg)
8DK-20e Dry Weight
22.0 tonnes (22000 kg)
Displacement (6-cylinder calculated)
56.5 liters (56500 cc)
Cooling System
Jacket cooling with fresh water and sea water cooler option
Fuel Injection
Direct injection with nozzle cooling system (critical for HFO operation)
Starting System
Direct electric start (6DK+); Air motor start (5DK)
power kw
925
rpm
900
fuel type
HFO/MDO
configuration
L
source
manufacturer datasheet
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Common failures & inspection points
Fuel injection nozzle corrosion from improper cooling temperature control. Low temperatures cause sulfated corrosion on nozzle tip; high temperatures cause carb
Vibration and fatigue failure of fuel oil piping due to high-pressure oscillations; documented technical bulletin countermeasures exist
Cylinder ring groove wear and chromium plating degradation requiring renewal; chromium-plated piston rings must be replaced when original surface appears worn
O-ring degradation in cooling water connecting pipes leading to sealing failures and coolant leakage; improved O-ring specifications documented
Piston ring seal degradation causing insufficient compression pressure; non-airtight piston rings require maintenance or replacement
Type-general inspection and maintenance points for this equipment category — not model-specific.
Suppliers & Spare Parts
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Equipment Model #123422
· ✓ still in production
Wer liefert dieses Teil? 70 Betriebe im Verzeichnis · 15 aus Herstellerlisten
SIMARINA UAB
Klaipeda, Lithuania
Shanghai Huiyang Marine Spares & Repairs Co., Ltd.
Shanghai, China
Aba Eko Gas Station Astypalaia
Leipzig, Germany
Alfa Marine Solutions
Poland
Antwerp Diesel Pumps NV
Deurne / Antwerp, Belgium
Aramco Green Marine Llc Fz
Saudi Arabia
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