Komatsu SA6D170 Marine Engine Parts
The Komatsu SA6D170 belongs to Komatsu’s heavy-duty 170-series diesel engine family. It is a large inline six-cylinder, four-stroke diesel engine with turbocharging, designed for applications where strong torque, durability and reliable operation under sustained load are important.
In marine and marinized applications, these engines may remain in service for many years. As operating hours accumulate, requirements can move from normal filters, gaskets and seals to fuel-system components, turbocharger parts, cooling-system components, cylinder-head parts and eventually complete overhaul components.
But when an SA6D170 develops a problem, replacing the component that appears most obvious is not always the answer.
For example:
Black smoke does not automatically mean the turbocharger has failed.
Low oil pressure does not automatically mean the oil pump needs replacing.
Overheating does not automatically mean the cooling-water pump is bad.
The engine needs to be considered as a complete system.
Alfa Marine Spare Parts supports Komatsu SA6D170 Marine Engine Spare Parts requirements for:
- Routine Maintenance
- Fuel-System Repair
- Turbocharger Repair
- Air Intake and Exhaust Repair
- Cooling-System Repair
- Lubrication-System Repair
- Cylinder Head 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 SA6D170 Engine?
The Komatsu SA6D170 is a turbocharged inline six-cylinder diesel engine from Komatsu's 170-series heavy-duty engine family.
Major engine systems and assemblies include:
- Cylinder Block
- Cylinder Head and Valve Train
- Pistons
- Piston Rings
- Piston Pins
- Connecting Rods
- Crankshaft
- Main Bearings
- Connecting Rod Bearings
- Camshaft
- Timing Gear System
- Fuel Injection System
- Turbocharger
- Air Intake System
- Exhaust System
- Cooling System
- Lubrication System
- Starting System
- Charging System
In a marine conversion, additional equipment can include seawater pumps, heat exchangers and application-specific cooling and exhaust components.
Komatsu SA6D170 Technical Information
Exact ratings and specifications can vary according to the particular SA6D170 version and application. The engine identification plate and serial number should therefore be used when confirming application-specific technical information and spare parts.
Technical InformationKomatsu SA6D170ManufacturerKomatsuEngine Family170 SeriesEngine ModelSA6D170Engine TypeHeavy-Duty DieselCylinder ArrangementInline 6-CylinderOperating CycleFour-StrokeBore170 mmStroke170 mmDisplacementApprox. 23.15 LitresAspirationTurbochargedCoolingLiquid CooledLubricationPressure LubricationFuelDiesel
Rated output and operating speed should be confirmed from the exact engine specification because SA6D170 ratings can differ by version and application.
What Does Komatsu SA6D170 Mean?
The engine designation helps distinguish this model from related engines in the Komatsu 170-series family.
Related models include:
Komatsu S6D170
Komatsu SA6D170
Komatsu SAA6D170
Although they belong to the same broader engine family, their complete configurations are different.
What Is the Difference Between S6D170, SA6D170 and SAA6D170?
One of the most important differences is the air-handling configuration.
In general:
S6D170 → Naturally Aspirated
SA6D170 → Turbocharged
SAA6D170 → Turbocharged with Charge-Air Cooling
This distinction is important when ordering components.
It can affect:
- Turbocharger Components
- Air Intake Components
- Exhaust Components
- Manifolds
- Cooling Components
- Pipework
- Hoses
- Gaskets
- Seals
- Mounting Hardware
Parts should therefore be matched to the complete SA6D170 designation rather than simply ordered as "Komatsu 170-series parts."
Is the Komatsu SA6D170 Turbocharged?
Yes.
The Komatsu SA6D170 is turbocharged.
The turbocharger uses energy from the engine's exhaust gases to compress the incoming combustion air.
Potential turbocharger-related requirements can include:
- Complete Turbocharger
- Turbocharger Cartridge
- Compressor Components
- Turbine Components
- Bearings
- Seals
- Oil Supply Components
- Oil Drain Components
- Intake Connections
- Exhaust Connections
- Gaskets
- Mounting Hardware
Why Is the Turbocharger Important on the SA6D170?
The turbocharger is part of the engine's overall combustion-air system.
When turbocharger performance falls, the engine may not receive the airflow expected for the fuel being delivered.
Possible symptoms can include:
- Reduced Engine Power
- Black Exhaust Smoke
- Poor Response Under Load
- Increased Exhaust Temperature
- Abnormal Turbocharger Noise
- Oil Leakage
- Increased Oil Consumption
However, these symptoms do not automatically prove that the turbocharger itself has failed.
The SA6D170 Has Lost Power — Does It Need a New Turbocharger?
Not necessarily.
Reduced engine power can also result from:
- Restricted Air Filter
- Intake Restriction
- Exhaust Leakage
- Exhaust Restriction
- Restricted Fuel Filters
- Poor Fuel Supply
- Injector Problems
- Fuel Injection Problems
- Low Cylinder Compression
- Valve Problems
- Excessive Engine Load
The complete air, fuel and combustion systems should therefore be investigated before replacing the turbocharger.
Komatsu SA6D170 Turbocharger Parts
Potential requirements can include:
- Complete Turbocharger
- Turbocharger Cartridge
- Compressor Wheel Components
- Turbine Components
- Turbocharger Bearings
- Turbocharger Seals
- Oil Feed Components
- Oil Drain Components
- Intake Connections
- Exhaust Connections
- Turbocharger Gaskets
- Mounting Components
Why Can an SA6D170 Replacement Turbocharger Fail Again?
Sometimes the failed turbocharger is the result of another engine problem rather than the original cause.
Before fitting a replacement turbocharger, investigate:
- Lubricating-Oil Supply
- Turbocharger Oil Drain
- Engine Oil Condition
- Air Intake Restriction
- Foreign-Object Damage
- Exhaust Restriction
- Excessive Exhaust Temperature
Installing a replacement without correcting the original cause can expose the new turbocharger to the same damaging condition.
Komatsu SA6D170 Air Intake Parts
Potential requirements can include:
- Air Filter Elements
- Air Cleaner Components
- Intake Pipes
- Intake Connections
- Intake Manifold Components
- Clamps
- Hoses
- Gaskets
- Seals
Can a Dirty Air Filter Make the SA6D170 Smoke?
Yes.
A turbocharged diesel still depends on having a sufficient supply of clean intake air.
A restricted air filter or intake path can contribute to:
- Black Smoke
- Reduced Power
- Poor Response Under Load
- Higher Exhaust Temperature
- Increased Fuel Consumption
The intake system should therefore be checked before assuming there is a fuel-injection or turbocharger failure.
Komatsu SA6D170 Exhaust-System Parts
Potential requirements can include:
- Exhaust Manifold Components
- Turbocharger Exhaust Connections
- Exhaust Pipes
- Exhaust Gaskets
- Sealing Components
- Fasteners
- Associated Hardware
Why Is an Exhaust Leak Before the Turbocharger Important?
The turbocharger turbine is driven by exhaust-gas energy.
If exhaust gases escape before reaching the turbine, turbocharger performance can be affected.
Possible signs can include:
- Soot Around Exhaust Joints
- Reduced Engine Response
- Abnormal Exhaust Noise
- Reduced Turbocharger Performance
Soot around the manifold or turbocharger flange should therefore be investigated rather than simply cleaned away.
Komatsu SA6D170 Fuel-System Parts
Potential requirements can include:
- Fuel Injectors
- Injector Components
- Fuel Injection Components
- Fuel Transfer Components
- Primary Fuel Filters
- Secondary Fuel Filters
- Fuel-Water Separator Elements
- High-Pressure Fuel Pipes
- Fuel Return Components
- Injector Seals
- Gaskets
- O-Rings
What Happens When the SA6D170 Fuel System Starts Losing Performance?
Possible symptoms can include:
- Difficult Starting
- Rough Running
- Uneven Cylinder Operation
- Increased Exhaust Smoke
- Reduced Power
- Increased Fuel Consumption
- Poor Response Under Load
- Abnormal Combustion Noise
The important point is that several engine problems can produce similar symptoms.
A smoking cylinder, for example, may involve the injector—but compression and valve condition should also be considered.
Komatsu SA6D170 Fuel Injectors
Potential requirements can include:
- Complete Fuel Injectors
- Injector Components
- Injector Seals
- High-Pressure Fuel Pipes
- Fuel Return Components
- Associated Hardware
One SA6D170 Cylinder Is Running Differently — Is the Injector Bad?
Possibly, but not automatically.
Investigate:
- Injector Performance
- Fuel Delivery
- Cylinder Compression
- Intake Valve Condition
- Exhaust Valve Condition
- Valve Adjustment
- Piston Condition
- Piston Ring Condition
- Cylinder Condition
Comparing one cylinder against the other five can provide useful diagnostic information.
Komatsu SA6D170 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 SA6D170 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
In a marine installation, the seawater side also needs to be considered.
Why Does the SA6D170 Run Hot Only Under Heavy Load?
This can be an important clue.
At low engine load, less heat needs to be removed.
When load increases, the cooling system must reject considerably more heat.
A cooling system that has lost part of its capacity may therefore appear normal during light operation but struggle under sustained load.
Investigate:
- Coolant Level
- Thermostat Operation
- Cooling-Water Pump Performance
- Cooling Passages
- Oil Cooler
- Cooling-System Restrictions
On marine installations, also investigate:
- Seawater Pump
- Sea Strainer
- Raw-Water Flow
- Heat Exchanger
- Raw-Water Pipework
Komatsu SA6D170 Cooling-Water Pump Parts
Potential requirements can include:
- Complete Cooling-Water Pump
- Pump Housing
- Pump Shaft
- Bearings
- Mechanical Seal
- Impeller
- Gaskets
- O-Rings
Does an SA6D170 Water Pump Have to Leak Before It Is Bad?
No.
A pump can lose circulation performance without producing an obvious external leak.
Possible problems include:
- Bearing Wear
- Mechanical-Seal Problems
- Impeller Damage
- Internal Corrosion
- Cavitation
- Coolant Contamination
Cooling-system diagnosis should therefore look beyond external leakage alone.
Komatsu SA6D170 Marine Seawater Pump Parts
A marinized SA6D170 may use a separate raw-water pump as part of the vessel's cooling arrangement.
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 SA6D170 Marine Seawater Pumps the Same?
Not necessarily.
Marine conversion equipment can differ between installations.
The seawater pump may have been supplied as part of the marinization package rather than as a standard base-engine component.
For accurate identification, provide:
- Pump Manufacturer
- Pump Model
- Existing Part Number
- Engine Serial Number
- Clear Photographs
- Mounting Arrangement
- Pipe and Hose Connections
Komatsu SA6D170 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 Under Load?
A heat exchanger can gradually lose efficiency because of:
- Salt Deposits
- Scale
- Sediment
- Marine Growth
- Corrosion Products
- Debris
- Restricted Seawater Flow
A partially restricted heat exchanger may remove enough heat at light load but become insufficient when the engine is working harder.
Komatsu SA6D170 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 SA6D170 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 Main-Bearing Clearance
- Excessive Connecting Rod Bearing Clearance
- Internal Engine Wear
- Oil Pressure Sender or Instrumentation Problems
If excessive bearing clearance is responsible for the pressure loss, replacing only the oil pump will not correct the underlying wear.
Komatsu SA6D170 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 SA6D170 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 what can safely be reused, reconditioned or replaced.
Komatsu SA6D170 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 wear include:
- Excessive Blow-By
- Increased Oil Consumption
- Reduced Compression
- Difficult Starting
- Exhaust Smoke
- Reduced Engine Performance
Does Excessive Blow-By Mean the SA6D170 Just 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 complete piston-and-cylinder condition should be inspected and measured.
Komatsu SA6D170 Connecting Rod and Bearing Parts
Potential requirements can include:
- Connecting Rods
- Connecting Rod Bearings
- Big-End Bearings
- Small-End Bushings
- Connecting Rod Bolts
- Main Bearings
- Thrust Components
Connecting rods deserve particular attention following bearing failure, lubrication problems or major piston damage.
Komatsu SA6D170 Crankshaft Parts
Potential requirements can include:
- Complete Crankshaft
- Main Bearings
- Connecting Rod Bearings
- Thrust Components
- Crankshaft Gear Components
- Front Crankshaft Seal
- Rear Crankshaft Seal
Why Should the SA6D170 Crankshaft Be Measured Before Ordering Bearings?
An older engine may already have undergone one or more overhauls.
The crankshaft may previously have been:
- Polished
- Repaired
- Reground
- Replaced
Inspection should consider:
- Main Journal Diameter
- Connecting Rod Journal Diameter
- Surface Condition
- Scoring
- Taper
- Out-of-Round Condition
- Heat Damage
- Evidence of Previous Machining
If journal dimensions have changed, the required bearing specification may also be different.
Measure first. Select bearings second.
Komatsu SA6D170 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
- Turbocharger 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 SA6D170 engine configuration.
Komatsu SA6D170 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
- Turbocharger Components
- Cooling-System Components
- Lubrication-System Components
Depending on inspection results, additional requirements can include:
- Crankshaft
- Connecting Rods
- Camshaft
- Fuel Injectors
- Fuel Injection Components
- Complete Turbocharger
- Cooling-Water Pump
- Oil Pump
- Oil Cooler
- Starter Motor
- Alternator
Should an SA6D170 Overhaul Kit Be Ordered Before Disassembly?
Some routine overhaul components can be planned in advance.
However, the final parts requirement should ideally follow inspection and measurement.
Once the engine is open, the workshop can determine:
Are the cylinders within acceptable condition?
Can the pistons be reused?
Has the crankshaft previously been machined?
Which bearings are required?
What condition are the cylinder-head components in?
Are the connecting rods serviceable?
Does the turbocharger require repair or replacement?
A practical sequence is:
Identify → Disassemble → Clean → Inspect → Measure → Confirm Parts → Rebuild
What Information Should You Send for Komatsu SA6D170 Parts?
For accurate Komatsu SA6D170 Marine Engine Spare Parts identification, provide:
- Engine Model: Komatsu SA6D170
- Complete Engine Variant
- 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 turbochargers, fuel equipment, cooling pumps, seawater pumps, starter motors, alternators and marine conversion components, identification directly from the currently installed component is particularly useful.
Who Do We Supply?
Alfa Marine Spare Parts supports Komatsu SA6D170 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 SA6D170 Marine Engine Parts Supply
Alfa Marine Spare Parts supports Komatsu SA6D170 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 an injector, turbocharger, cooling-water pump, seawater pump, cylinder-head component, crankshaft, bearings, gasket set or a complete SA6D170 overhaul package, correct identification remains the starting point.