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Daihatsu

6DK-26

Name: Daihatsu 6DK-26
Brand: Daihatsu
SKU: OSE-38104

The Daihatsu 6DK-26 is a six‑cylinder, four‑stroke marine diesel main engine delivering up to 2100 kW at 750 rpm, featuring turbocharging, intercooling and direct injection.

2100.0 kW

Power

Engine Specifications

Cylinders

260 mm

Bore

380 mm

Stroke

2,100 kW

MCR Power

750.0 rpm

MCR RPM

4-stroke

Stroke Type

Family: Daihatsu Diesel DK · Tier: IMO Tier II · Fuel: HFO, MDO

Inspector Detail

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Common issues

Exhaust valve seat recession/spindle burning on continuously loaded cylinders, seen as exhaust temperature drift
Cylinder liner bore polishing/wear from lube oil feed rate mismatched to fuel sulphur content
Piston ring wear/sticking from carbon buildup, raising lube oil consumption and blow-by
Turbocharger compressor/turbine fouling reducing charge air pressure and increasing exhaust smoke
Fuel injector wear/coking causing uneven combustion between cylinders
Charge air cooler fouling or leakage reducing intercooling effectiveness and raising thermal load
Main/big-end bearing wear from oil contamination or extended change intervals
Governor/actuator linkage wear affecting speed control and load response

Inspection checklist

Trend exhaust gas temperature per cylinder, investigating significant deviation from the mean
Check turbocharger boost pressure/speed against the maker's load diagram
Inspect cylinder liner wear and piston condition at scheduled overhaul
Sample lube oil for water, fuel dilution, TBN, viscosity and wear metals
Inspect fuel injectors for spray pattern/opening pressure
Check valve clearances and exhaust valve seat/spindle condition
Verify charge air cooler pressure drop trend for fouling
Check governor response and overspeed trip function
Inspect turbocharger bearing condition/clearance

Service intervals

Valve clearance check	per maker manual, typically every 2,000-3,000 running hours
Injector service	typically every 4,000-6,000 running hours
Turbocharger overhaul	typically every 12,000-18,000 running hours
Lube oil analysis	every 250-500 running hours or per PMS
Piston/liner inspection	typically every 8,000-12,000 running hours

Typical wear limits

Cylinder liner bore wear	typically up to about 0.3-0.4% of nominal bore diameter for this class before renewal is considered - confirm against the engine's own manual
Piston ring gap	typically 0.8-1.4 mm for this bore class - confirm against the engine's own manual
Main bearing clearance	typically 0.15-0.30 mm depending on journal size - confirm against the maker's tolerance table

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

Cylinder liner
Piston and ring set
Exhaust/inlet valves and seats
Fuel injector assembly
Main and big-end bearing shells
Turbocharger repair kit
Charge air cooler element/gasket set

Safety

Crankcase explosion risk after undetected bearing distress - follow the cooling-down procedure before opening inspection doors after a suspected overheat
High-pressure fuel system can cause injection injury - depressurise before disconnecting lines
Hot exhaust/turbocharger surfaces and charge air piping during running inspection
Rotating flywheel/coupling guarding must be verified before removing covers

Class survey

Falls under Continuous Survey Machinery or periodic survey depending on notation; class typically reviews running hours since last overhaul, crankshaft deflection records, oil analysis trend and outstanding running-hour based maintenance items against IMO Tier II compliance records.

Estimated lifetime: Medium-speed 4-stroke main engines of this class typically run 100,000-150,000+ hours to major overhaul under the maker's maintenance scheme; actual life depends on load profile, fuel quality and maintenance history.