Cummins 6CT Engine Parts

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Cummins 6CT Engine Parts for Marine and Industrial Use

The Cummins 6CT engine is one of the most respected platforms in the diesel engine market. Designed for longevity, performance, and versatility, it powers both marine vessels and industrial equipment across the globe. Whether you're performing regular maintenance or a full engine rebuild, Diesel Pro Power offers a comprehensive selection of Cummins 6CT parts—backed by expert support and 24-hour worldwide shipping.

About the Cummins 6CT Engine

A Legacy of Strength and Versatility

The 6CT engine is part of Cummins’ C Series family, offering 8.3 liters of displacement in an inline 6-cylinder configuration. It combines robust design with high torque output and impressive fuel economy, making it ideal for applications where uptime and reliability are critical.

Engine Highlights:

Displacement: 8.3L (506 cubic inches)
Configuration: Inline 6-cylinder
Power Output: Up to 430 HP depending on tuning and configuration
Fuel System: Mechanical (early models) or electronic (later 6CTA models)
Cooling: Seawater/freshwater cooled (marine) or radiator cooled (industrial)
Aspiration: Turbocharged and aftercooled

The 6CT platform is known for its high torque at low RPMs, simple maintenance requirements, and long service life—all qualities that have made it a favorite in both marine propulsion and industrial operations.

Applications for the Cummins 6CT Engine

Marine Applications

The 6CT is widely used in:

Trawlers and fishing boats
Crew boats and pilot vessels
Passenger ferries and tour boats
Harbor service boats and commercial craft
Auxiliary marine power systems

Its ability to operate efficiently under heavy load and its compatibility with marine cooling systems make it a top pick for commercial fleets and private operators.

Industrial Applications

Outside of marine use, the Cummins 6CT also powers:

Excavators and wheel loaders
Irrigation and industrial water pumps
Standby and prime power generators
Construction machinery and drilling rigs
Off-road agricultural vehicles

The 6CT’s adaptability allows for both stationary and mobile applications, giving it an edge in sectors that demand uptime, durability, and simple serviceability.

Buy Cummins 6CT Parts Online

At Diesel Pro Power, we make it easy to buy genuine and aftermarket Cummins 6CT parts online. Our catalog is optimized for speed, accuracy, and ease of use—whether you’re an engineer, fleet manager, or boat owner.

Freshwater Pumps for Cummins 6CT

Maintain engine temperature and prevent overheating with high-performance freshwater components:

Freshwater pump assemblies
Thermostat kits
Pump seals and fan belts
Radiator cleaners and coolant additives

Our pumps are covered by warranty and built for continuous marine or industrial duty.

Cylinder Heads for Cummins 6CT

Ensure optimal compression and combustion with quality head components:

Complete cylinder heads (with or without valves and springs)
Valve seals, valve springs, and head bolts
Exhaust valves and intake valves
Head gasket sets and torque specs documentation

All heads are pressure-tested and machined to meet Cummins standards for flatness, seal quality, and valve seating.

Rebuild Kits for Cummins 6CT

Restore your engine to like-new condition with one of our comprehensive rebuild options:

Pistons and piston ring sets
Lower and upper gasket sets
Connecting rod shell sets
Crankshaft shell sets
Thrust washers and main bearings

We also offer individual rebuild components like piston kits, head gasket kits, and seal kits for targeted repairs.

Seawater Cooling Components For Cummins 6CT

If your Cummins 6CT is in a marine vessel, you’ll need durable seawater components to keep it cool and corrosion-free:

Raw water pump assemblies
Thermostats and temperature sensors
Basket strainers and zinc anodes
Seawater hoses and clamps

These parts are marine-grade and optimized for long life in saltwater environments.

Additional Cummins 6CT Parts Available Online

We carry an extensive list of additional components to keep your Cummins 6CT engine running reliably:

Crankshafts and Rotating Assemblies For Cummins 6CT

Crankshafts
Main bearings and connecting rods
Vibration dampers
Crankshaft seals

All rotating assemblies are balanced to OEM specs and ideal for full rebuilds.

Marine Cables and Switches For Cummins 6CT

Marine throttle and shift cables
Toggle switches
Start/stop switch kits
Remote control panels

Engineered for resistance to saltwater, vibration, and continuous-duty cycles.

Oil and Fuel Filters For Cummins 6CT

Spin-on oil filters
Fuel/water separator filters
Mounting bases and brackets
Filter wrenches and accessories

High-filtration media ensures extended engine life and cleaner performance.

Sensors, Gauges, and Electronics For Cummins 6CT

Oil pressure sensors
Water temperature sensors
Tachometers, voltage gauges, and hour meters
Multi-function gauge panels

All electronics are designed for marine or rugged industrial use, fully sealed and tested for accuracy.

Gaskets, Sealants, and Paint For Cummins 6CT

Full engine gasket kits
RTV silicone sealants and threadlockers
Cummins red and black engine enamel
Degreasers, flushes, and corrosion protectants

Finish your repairs with professional-grade sealing and paint solutions.

Why Buy Cummins 6CT Parts from Diesel Pro Power?

24-Hour Worldwide Shipping

Every in-stock item is shipped within 24 hours—delivered to ports, job sites, shops, and marinas across the globe.

Expert Customer Service

Need help finding the right part? Our experienced customer service team provides:

Compatibility checks
Installation advice
Custom shipping support
Rebuild recommendations

Reach us by phone or email for expert, friendly help.

Over 40,000 Satisfied Customers

We’ve built trust by offering high-quality parts, fast delivery, and honest service. That’s why over 40,0000 customers return to Diesel Pro Power.

Easy-to-Use Website

Our intuitive interface helps you:

Search by engine model or part number
Use visual aids to identify parts
Add items to cart and checkout securely in minutes

Verified Reviews

See why marine engineers, contractors, and boat owners rate Diesel Pro Power as the go-to source for Cummins 6CT parts.

Engine Specifications & Applications of the Cummins 6CT Engine

Introduction

The Cummins 6CT diesel engine is part of the trusted C Series platform and is widely used in marine and industrial markets thanks to its balance of power, simplicity, and rugged design. With a displacement of 8.3 liters, the 6CT is a step above earlier models like the 6B or 6BT, offering more torque and a stronger block for medium-duty and heavy-duty use cases.

This engine is a bridge between full mechanical systems and early-stage electronic integration, depending on the configuration. Many 6CT engines retain a mechanical injection system, making them popular for rebuilders, commercial operators, and service fleets working in remote or regulated-light environments. Their heavy-duty internal components and global availability of aftermarket parts make them a prime choice for repower projects and ongoing equipment service.

Cummins 6CT Engine Specifications

Specification	Detail
Engine Type	Inline 6-cylinder, 4-stroke diesel
Displacement	8.3 liters (505 cubic inches)
Bore x Stroke	114 mm x 135 mm (4.49 in x 5.31 in)
Fuel System	Mechanical (Bosch inline or rotary pump)
Aspiration	Turbocharged or turbocharged/aftercooled
Compression Ratio	17.5:1
Rated Horsepower Range	185–325 HP (138–242 kW)
Peak Torque	Up to 900 lb-ft (1220 Nm)
Max RPM Range	1800–2600 RPM (governed)
Cooling System	Water-cooled, gear-driven pump
Oil Capacity	6.5–7.5 gallons (24–28 liters)
Dry Weight	Approx. 1,450–1,500 lbs (658–680 kg)
Emissions Compliance	Tier 1 or Tier 2 (depending on market)

Key Features of the Cummins 6CT

High Displacement, Compact Size – The 6CT offers more torque than the 6BT/5.9 platform without increasing engine footprint significantly.
Mechanical Fuel System – Retains ease of service and reliability in harsh or remote conditions.
Turbocharged Options – Turbocharging improves power delivery and fuel efficiency, particularly under load.
Industrial-Grade Durability – Hardened crankshaft, thick block casting, and large rod bearings enhance longevity.
Versatile Integration – Compatible with a wide range of industrial power units and marine platforms.

Marine Applications of the Cummins 6CT

In marine markets, the Cummins 6CT engine is known for dependable performance and its ability to withstand long hours in coastal or offshore environments. It is a top pick for both auxiliary systems and main propulsion in medium-duty vessels.

Marine Applications

Marine Generator Sets (Gensets)
The 6CT powers 60Hz and 50Hz gensets across ferries, trawlers, tugboats, offshore service vessels, and commercial fishing boats. Its stable RPM and mechanical fuel system make it reliable for continuous or backup power needs.
Hydraulic System Power
Common in deck equipment such as cranes, winches, and pumps on vessels where power density and engine access are critical.
Propulsion Engines (Light Commercial)
Turbocharged and aftercooled versions of the 6CT are used for main propulsion in workboats and small passenger vessels, especially in countries or applications not requiring Tier 3 or Tier 4 emissions levels.
Fire Pumps and Bilge Systems
The engine's durability and independence from electronic controls make it ideal for onboard emergency systems that must start and operate reliably under all conditions.

Benefits for Marine Use

Fully mechanical versions work without ECU, ideal for salt-air and humid environments.
Can be keel-cooled or matched with a heat exchanger.
Configurable with marine-certified exhaust manifolds, alternators, raw water pumps, and control panels.
Simple rebuilds and diagnostics make it ideal for ship engineers and offshore crews.

Industrial Applications of the Cummins 6CT

In industrial sectors, the 6CT delivers consistent high-torque performance and low operational cost in demanding environments. Its mechanical injection system is particularly attractive for applications where downtime must be minimized, and emission regulations are not overly strict.

Generator and Power Applications

Prime and Standby Generators
Utilized in data centers, manufacturing plants, cold storage facilities, and mining operations where uptime is critical.
Mobile Generator Units
Mounted on trailers or skids for disaster recovery, field operations, and utility backup across continents.
Remote Installations
Chosen for off-grid power in oilfields, logging camps, and rural installations where Tier 4 diagnostics are not feasible.

Construction and Equipment Applications

Asphalt Equipment & Pavers
Loaders, Cranes, and Graders
Skid-mounted Pumps
Diesel-powered Compressors and Blowers

With its steady torque and overbuilt components, the 6CT handles heavy-duty construction cycles and continuous operation with minimal fuss. It’s a favorite among equipment owners looking to extend equipment life without investing in newer, electronically controlled Tier 4 units.