Komatsu 6D170 Marine Engine Parts
The Komatsu 6D170 belongs to Komatsu’s heavy-duty 170-series diesel engine family. It is a large inline six-cylinder diesel engine designed for demanding applications where durability, dependable operation and long engine life are important.
In marine and marinized installations, an older Komatsu 6D170 may have accumulated many operating hours and undergone several repairs during its working life. Fuel-system components may have been serviced, cylinder-head components rebuilt, cooling equipment replaced or major internal components inspected during previous overhauls.
This history matters when ordering replacement parts.
Two engines carrying the same basic 6D170 designation may not necessarily have exactly the same equipment currently installed.
Alfa Marine Spare Parts supports Komatsu 6D170 Marine Engine Spare Parts requirements for:
- Routine Maintenance
- Fuel-System Repair
- Cooling-System Repair
- Lubrication-System Repair
- Cylinder Head Repair
- Air Intake and Exhaust Repair
- Internal Engine Repair
- Major Engine Overhaul
Depending on availability, supply options can include:
- Genuine Komatsu Parts
- OEM-Quality Components
- Selected Aftermarket Parts
- Remanufactured Components
- Maintenance Parts
- Repair Components
- Overhaul Parts
What Is the Komatsu 6D170 Engine?
The Komatsu 6D170 is a heavy-duty inline six-cylinder diesel engine from Komatsu’s 170-series family.
Major engine systems and assemblies can include:
- Cylinder Block
- Cylinder Head
- Valve Train
- Pistons
- Piston Rings
- Piston Pins
- Connecting Rods
- Crankshaft
- Main Bearings
- Connecting Rod Bearings
- Camshaft
- Timing Gear System
- Fuel Injection System
- Air Intake System
- Exhaust System
- Cooling System
- Lubrication System
- Starting System
- Charging System
When adapted for marine operation, additional equipment can be incorporated into the installation, including marine cooling and exhaust components.
Komatsu 6D170 Technical Information
The exact technical specification of a Komatsu 6D170 should be confirmed from the engine identification plate, serial number and application documentation.
Technical InformationKomatsu 6D170ManufacturerKomatsuEngine Family170 SeriesEngine Model6D170Fuel TypeDieselCylinder ArrangementInline 6-CylinderOperating CycleFour-StrokeCoolingLiquid CooledLubricationPressure Lubrication
Exact bore, stroke, displacement, aspiration arrangement, rated power and operating speed should be confirmed against the particular 6D170 engine specification rather than assumed from another Komatsu 170-series model.
Why Is the Complete Komatsu 6D170 Model Important?
The 6D170 designation sits within a wider Komatsu engine family.
Related designations can include engines such as:
- Komatsu 6D170
- Komatsu S6D170
- Komatsu SA6D170
- Komatsu SAA6D170
These model names should not automatically be treated as interchangeable.
Differences between versions can affect:
- Air Intake Components
- Exhaust Components
- Fuel-System Components
- Cooling Components
- Gaskets
- Pipework
- Mounting Components
- Internal Engine Components
- Application-Specific Equipment
This is why the complete identification plate should be checked when requesting parts.
Is the Komatsu 6D170 the Same as the S6D170?
The model names should not automatically be treated as the same engine specification.
When identifying parts, use the designation shown on the actual engine identification plate.
If the plate identifies the engine as 6D170, the parts request should begin with 6D170 rather than automatically changing the model to S6D170, SA6D170 or SAA6D170.
For major components, also provide:
- Engine Serial Number
- Existing Part Number
- Component Manufacturer
- Casting Number Where Available
- Clear Photographs
Komatsu 6D170 Fuel-System Parts
The fuel system has to provide clean and correctly metered fuel to all six cylinders.
Potential requirements can include:
- Fuel Injectors
- Injector Components
- Fuel Injection Components
- Fuel Supply Components
- Fuel Transfer Components
- Primary Fuel Filters
- Secondary Fuel Filters
- Fuel-Water Separator Elements
- Fuel Pipes
- Fuel Return Components
- Injector Seals
- Fuel-System Gaskets
- O-Rings
What Are Signs of a 6D170 Fuel-System Problem?
Possible symptoms can include:
- Difficult Starting
- Rough Running
- Uneven Cylinder Operation
- Increased Exhaust Smoke
- Reduced Engine Power
- Increased Fuel Consumption
- Poor Response Under Load
- Abnormal Combustion Noise
However, these symptoms should not automatically be blamed on the injectors.
Similar symptoms can result from:
- Poor Fuel Supply
- Restricted Fuel Filters
- Intake Restriction
- Low Compression
- Valve Problems
- Internal Cylinder Wear
Diagnosis should therefore consider the complete engine condition.
Komatsu 6D170 Fuel Injectors
Potential requirements can include:
- Complete Fuel Injectors
- Injector Components
- Injector Seals
- Fuel Pipes
- Fuel Return Components
- Associated Hardware
One 6D170 Cylinder Is Running Differently — Is the Injector Bad?
It could be, but the injector is only one possibility.
If one cylinder behaves differently from the other five, investigate:
- Injector Performance
- Fuel Delivery
- Cylinder Compression
- Intake Valve Condition
- Exhaust Valve Condition
- Valve Adjustment
- Piston Condition
- Piston Ring Condition
- Cylinder Condition
Comparing cylinders can help determine whether the problem is related to fuel delivery or mechanical condition.
Komatsu 6D170 Air Intake Parts
Potential requirements can include:
- Air Filter Elements
- Air Cleaner Components
- Intake Pipes
- Intake Hoses
- Intake Connections
- Intake Manifold Components
- Clamps
- Gaskets
- Seals
Can a Restricted Air Filter Cause Black Smoke?
Yes.
A diesel engine needs sufficient clean air for efficient combustion.
Restricted airflow can contribute to:
- Black Exhaust Smoke
- Reduced Engine Power
- Poor Response Under Load
- Higher Exhaust Temperature
- Increased Fuel Consumption
The air filter and complete intake path should therefore be inspected when diagnosing smoke or reduced performance.
Komatsu 6D170 Exhaust-System Parts
Potential requirements can include:
- Exhaust Manifold Components
- Exhaust Pipes
- Exhaust Connections
- Exhaust Gaskets
- Sealing Components
- Fasteners
- Associated Hardware
What Does Soot Around a 6D170 Exhaust Joint Mean?
Soot around an exhaust joint can indicate leakage.
Possible causes include:
- Failed Exhaust Gasket
- Loose Fasteners
- Damaged Flange
- Distorted Sealing Surface
- Cracked Exhaust Component
Cleaning away the soot does not correct the problem.
The source of the exhaust leak should be investigated.
Komatsu 6D170 Cooling-System Parts
Potential requirements can include:
- Cooling-Water Pump
- Water-Pump Components
- Thermostats
- Thermostat Housing Components
- Cooling Pipes
- Cooling Hoses
- Oil Cooler Components
- Gaskets
- O-Rings
- Seals
Why Can a Komatsu 6D170 Overheat?
Possible causes can include:
- Low Coolant Level
- Poor Coolant Condition
- Thermostat Problems
- Reduced Cooling-Water Pump Performance
- Restricted Cooling Passages
- Oil Cooler Restriction
- Cooling-System Contamination
- Restricted Coolant Flow
For a marine installation, the raw-water side of the cooling system should also be investigated.
Why Does the 6D170 Run Hot Only Under Load?
This can provide an important clue.
At light load, the engine produces less heat.
As engine load increases, considerably more heat must be transferred through the cooling system.
A partially restricted or deteriorated cooling system may therefore appear normal at light load but struggle during sustained operation.
Areas to investigate can include:
- Coolant Level
- Coolant Condition
- Thermostat
- Cooling-Water Pump
- Cooling Passages
- Oil Cooler
- Cooling-System Restrictions
On a marine installation, seawater flow and heat-exchanger condition should also be considered.
Komatsu 6D170 Cooling-Water Pump Parts
Potential requirements can include:
- Complete Cooling-Water Pump
- Pump Housing
- Pump Shaft
- Bearings
- Mechanical Seal
- Impeller
- Gaskets
- O-Rings
Does a Bad 6D170 Water Pump Always Leak?
No.
A water pump can lose circulation performance without producing an obvious external coolant leak.
Possible problems can include:
- Bearing Wear
- Mechanical-Seal Deterioration
- Impeller Damage
- Internal Corrosion
- Cavitation
- Coolant Contamination
The pump should therefore be evaluated as part of the complete cooling system.
Komatsu 6D170 Marine Seawater Pump Parts
Where the 6D170 has been adapted for marine service, a separate raw-water or seawater pump may form part of the installation.
Potential requirements can include:
- Complete Seawater Pump
- Pump Housing
- Pump Shaft
- Bearings
- Mechanical Seal
- Impeller Where Applicable
- Wear Components
- Cover Components
- Gaskets
- O-Rings
Are All Komatsu 6D170 Marine Seawater Pumps the Same?
Not necessarily.
Marine cooling equipment can depend on how the engine was marinized and how the vessel's cooling system was designed.
The seawater pump should therefore be identified from the actual installed component.
Useful information includes:
- Pump Manufacturer
- Pump Model
- Existing Part Number
- Engine Serial Number
- Clear Photographs
- Mounting Arrangement
- Pipe Connections
- Hose Connections
Komatsu 6D170 Marine Heat Exchanger Parts
Depending on the marine installation, potential requirements can include:
- Complete Heat Exchanger
- Heat Exchanger Core
- Tube Bundle
- Housing
- End Covers
- Cooling Connections
- Gaskets
- O-Rings
- Seals
Why Can a Marine Heat Exchanger Cause Overheating?
Marine heat exchangers can gradually lose heat-transfer capacity because of:
- Salt Deposits
- Scale
- Sediment
- Marine Growth
- Corrosion Products
- Debris
- Restricted Seawater Flow
This is one reason an engine may operate normally at light load but begin running hot when vessel demand increases.
Komatsu 6D170 Lubrication-System Parts
Potential requirements can include:
- Engine Oil Pump
- Oil Pump Components
- Engine Oil Filters
- Oil Cooler
- Oil Cooler Components
- Oil Pressure Components
- Oil Pipes
- Oil Lines
- Gaskets
- O-Rings
- Front Crankshaft Seal
- Rear Crankshaft Seal
Low Oil Pressure — Does the Komatsu 6D170 Need a New Oil Pump?
Not automatically.
Possible causes can include:
- Low Oil Level
- Incorrect Lubricating Oil
- Deteriorated Oil
- Restricted Oil Filter
- Oil Pump Wear
- Pressure-Regulating Problems
- Excessive Bearing Clearance
- Internal Engine Wear
- Pressure Sender or Instrumentation Problems
On an older engine, bearing condition becomes particularly important.
If excessive internal clearance is responsible for pressure loss, replacing only the oil pump will not correct the underlying problem.
Komatsu 6D170 Oil Cooler Parts
Potential requirements can include:
- Complete Oil Cooler
- Oil Cooler Core
- Oil Cooler Housing
- Oil Connections
- Cooling Connections
- Gaskets
- O-Rings
- Seals
Oil-cooler condition should be considered when investigating abnormal lubricating-oil temperature or overall cooling performance.
Komatsu 6D170 Cylinder Head Parts
Potential requirements can include:
- Cylinder Head Components
- Cylinder Head Gaskets
- Intake Valves
- Exhaust Valves
- Valve Guides
- Valve Seats
- Valve Springs
- Rocker Components
- Valve-Train Components
- Injector Sealing Components
- Valve Cover Gaskets
When Should Komatsu 6D170 Cylinder Head Components Be Inspected?
Cylinder-head inspection may become necessary following:
- Engine Overheating
- Coolant Loss
- Head-Gasket Failure
- Low Compression
- Valve Problems
- Uneven Cylinder Performance
- Abnormal Combustion
- Major Engine Overhaul
Inspection should determine which components remain serviceable and which require repair or replacement.
What Should Be Checked During Cylinder Head Inspection?
Important areas can include:
- Cracking
- Corrosion
- Flatness
- Sealing-Surface Condition
- Intake Valve Condition
- Exhaust Valve Condition
- Valve Seats
- Valve Guides
- Valve Springs
- Previous Machining
- Heat Damage
If the engine has suffered severe overheating, cylinder-head inspection becomes especially important.
Komatsu 6D170 Cylinder Head Gaskets
A failed head gasket should raise two questions:
What needs replacing?
and
Why did it fail?
Possible contributing conditions can include:
- Engine Overheating
- Cylinder Head Distortion
- Damaged Sealing Surfaces
- Cooling-System Problems
- Previous Assembly Problems
Replacing the gasket without correcting the original cause can lead to another failure.
Komatsu 6D170 Pistons and Piston Rings
Potential requirements can include:
- Pistons
- Piston Ring Sets
- Piston Pins
- Piston Pin Bushings
- Retaining Components
Possible indications of piston, ring or cylinder deterioration can include:
- Excessive Blow-By
- Increased Oil Consumption
- Reduced Compression
- Difficult Starting
- Exhaust Smoke
- Reduced Engine Performance
Does Excessive Blow-By Mean the 6D170 Only Needs New Rings?
Not necessarily.
Possible causes can include:
- Piston Ring Wear
- Cylinder Wear
- Piston Wear
- Ring-Groove Wear
- Internal Engine Damage
Installing new rings into excessively worn cylinders will not restore the engine correctly.
The pistons, rings and cylinder condition should be evaluated together.
Komatsu 6D170 Connecting Rod Parts
Potential requirements can include:
- Connecting Rods
- Connecting Rod Bearings
- Big-End Bearings
- Small-End Bushings
- Connecting Rod Bolts
- Associated Hardware
Connecting rods deserve careful inspection following:
- Bearing Failure
- Lubrication Failure
- Piston Damage
- Serious Internal Engine Damage
Komatsu 6D170 Crankshaft and Bearing Parts
Potential requirements can include:
- Complete Crankshaft
- Main Bearings
- Connecting Rod Bearings
- Big-End Bearings
- Thrust Components
- Crankshaft Gear Components
- Front Crankshaft Seal
- Rear Crankshaft Seal
Why Should a 6D170 Crankshaft Be Measured Before Ordering Bearings?
An older engine may already have undergone previous overhaul work.
The crankshaft may have been:
- Polished
- Repaired
- Reground
- Replaced
Inspection should consider:
- Main Journal Diameter
- Connecting Rod Journal Diameter
- Journal Surface Condition
- Scoring
- Taper
- Out-of-Round Condition
- Heat Damage
- Evidence of Previous Machining
The required bearings should be selected according to the actual crankshaft condition and specification.
Measure first. Select bearings second.
Komatsu 6D170 Camshaft and Timing Parts
Potential requirements can include:
- Camshaft
- Camshaft Bearings
- Timing Gears
- Gear-Train Components
- Timing Covers
- Timing Cover Gaskets
- Valve-Train Components
- Related Bushings
During a major overhaul, timing and camshaft components should be inspected rather than automatically assumed to be reusable.
Komatsu 6D170 Gaskets and Seals
Potential requirements can include:
- Complete Engine Gasket Set
- Upper Gasket Set
- Lower Gasket Set
- Cylinder Head Gaskets
- Valve Cover Gaskets
- Intake Gaskets
- Exhaust Gaskets
- Oil Cooler Gaskets
- Cooling-System Gaskets
- Injector Seals
- O-Rings
- Front Crankshaft Seal
- Rear Crankshaft Seal
The gasket package should be matched to the exact Komatsu 6D170 engine configuration.
Komatsu 6D170 Starter Motor and Alternator Parts
Potential electrical requirements can include:
- Starter Motor
- Starter Solenoid
- Starter Components
- Alternator
- Alternator Components
- Drive Belts
- Pulleys
- Belt-Tension Components
- Electrical Connections
For an older installation, identification from the currently installed starter or alternator can be particularly useful because these components may have been replaced previously.
Komatsu 6D170 Overhaul Parts
A major engine overhaul can require:
- Pistons
- Piston Rings
- Piston Pins
- Main Bearings
- Connecting Rod Bearings
- Thrust Components
- Connecting Rod Bushings
- Cylinder Head Components
- Intake Valves
- Exhaust Valves
- Crankshaft Seals
- Complete Gasket Sets
- Engine Seal Kits
- Fuel-System Components
- Cooling-System Components
- Lubrication-System Components
Depending on inspection results, additional requirements may include:
- Crankshaft
- Connecting Rods
- Camshaft
- Fuel Injectors
- Fuel Injection Components
- Cooling-Water Pump
- Oil Pump
- Oil Cooler
- Starter Motor
- Alternator
Should a Komatsu 6D170 Overhaul Kit Be Ordered Before Disassembly?
Some planned service parts can be prepared beforehand, but the final overhaul requirement should ideally follow inspection and measurement.
Once the engine has been opened, important questions can be answered:
Are the cylinders still serviceable?
Can the pistons be reused?
Has the crankshaft been machined previously?
Which bearings are required?
What condition are the cylinder-head components in?
Are the connecting rods serviceable?
A practical sequence is:
Identify → Disassemble → Clean → Inspect → Measure → Confirm Parts → Rebuild
This helps build the overhaul around the actual condition of the engine rather than assumptions.
What Information Should You Send for Komatsu 6D170 Parts?
For accurate Komatsu 6D170 Marine Engine Spare Parts identification, provide:
- Engine Model: Komatsu 6D170
- Complete Model Shown on Identification Plate
- Engine Serial Number
- Engine Identification Plate
- Existing Komatsu Part Number
- Component Manufacturer Number
- Part Description
- Quantity Required
- Clear Photographs
- Vessel or Equipment Application
- Delivery Country or Nearest Port
For fuel equipment, cooling pumps, seawater pumps, starter motors, alternators and marine conversion components, information from the currently installed component is particularly useful.
Who Do We Supply?
Alfa Marine Spare Parts supports Komatsu 6D170 requirements for:
- Shipyards
- Ship Repairers
- Marine Engineers
- Chief Engineers
- Technical Superintendents
- Fleet Operators
- Marine Service Companies
- Commercial Fishing Companies
- Offshore Operators
- Government Fleets
- Maritime Contractors
- Boat Builders
- Marine Equipment Distributors
- Commercial Vessel Operators
Worldwide Komatsu 6D170 Marine Engine Parts Supply
Alfa Marine Spare Parts supports Komatsu 6D170 Marine Engine Spare Parts requirements across major marine markets, including Spain, Italy, Monaco, France, the Netherlands, Belgium, Germany, Greece, the United Kingdom, Dubai and the UAE, Nigeria, Miami and Florida, Texas, Toronto and Canada, the Caribbean, South America and other major international seaports.
Whether the requirement involves fuel injectors, cooling-system components, cylinder-head parts, pistons, crankshaft bearings, gasket sets or a larger 6D170 overhaul package, accurate engine and component identification remains the starting point.