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Cummins QSL Engine Parts – Complete Catalog for Dependable Marine Performance

Introduction to Cummins QSL Marine Engines

Cummins QSL engines are renowned for their unmatched durability, efficiency, and performance in marine applications. Specifically engineered to meet the demands of commercial vessels and trawlers, the QSL series ensures thousands of hours of reliable operation, even in challenging marine environments. Whether you're powering a workboat, ferry, or trawler, these engines deliver consistent horsepower, high torque, and fuel efficiency.

At Diesel Pro Power, we understand how critical it is to keep your Cummins QSL engine running smoothly. That's why we offer an expansive selection of genuine and high-quality replacement parts, designed to match Cummins specifications and backed by our fast shipping and customer-first approach.

Why Choose Diesel Pro Power for Cummins QSL Engine Parts?

1. Over 40,000 Satisfied Customers Worldwide

With a global customer base spanning marine professionals, shipyards, and fleet managers, Diesel Pro Power is trusted by over 40,000 customers worldwide. Our commitment to quality and reliability has made us the go-to source for Cummins QSL engine parts, ensuring you receive products that meet your performance expectations.

2. Intuitive, User-Friendly Website

Our website is intelligently designed for ease of navigation, allowing both novices and experienced technicians to quickly locate the exact Cummins QSL parts they need. Each product page provides detailed descriptions, diagrams, and technical specifications to ensure compatibility with your engine.

3. Excellent Reviews and Service

We take pride in delivering not only premium parts but also unparalleled customer service. Our customers consistently praise our knowledgeable support staff, prompt responses, and accurate order fulfillment. Read our reviews to see how we consistently go above and beyond.

4. 24-Hour Worldwide Shipping

Diesel Pro Power’s industry-leading shipping speeds ensure that your Cummins QSL parts arrive when you need them most. Whether you’re docked in a bustling harbor or operating a remote trawler, we’ll deliver within 24 hours worldwide, so you can resume operations without delay.

Comprehensive Cummins QSL Engine Parts Catalog – Aftermarket Solutions for Marine Applications

Introduction to Cummins QSL Marine Engines

Cummins QSL engines are known for delivering reliable power in marine environments, from commercial trawlers to workboats and ferries. Their robust inline-six design and fuel-efficient operation make them ideal for long service intervals and demanding conditions. To keep these engines performing at their best, Diesel Pro Power offers a complete catalog of aftermarket Cummins QSL parts, designed to meet or exceed performance expectations without the OEM price tag.

Our inventory includes high-quality, aftermarket components for every system of the engine, from fuel delivery and cooling to air handling and electrical. Whether you’re performing routine maintenance or a full engine rebuild, you’ll find everything you need in one place, ready for fast, worldwide delivery.

1. Rebuild Kits and Related Components for Cummins QSL Engines

Our aftermarket rebuild kits offer everything needed to restore your engine, including cylinder liners for complete engine block rejuvenation. Each kit includes:

  • Cylinder liners, pistons, rings, wrist pins, and clips.

  • Upper and lower gasket sets to reseal the engine.

  • Bearings and seals for the crankshaft, camshaft, and connecting rods.
    These comprehensive kits ensure long-lasting engine performance and reliability.

2. Gauges and Related Components for Cummins QSL Engines

Our aftermarket gauges provide accurate monitoring of vital engine parameters:

  • Oil pressure and temperature gauges to prevent engine damage.

  • Tachometers for precise RPM monitoring.

  • Available in both mechanical and electrical designs, complete with installation hardware.

3. Engine Water Pumps and Related Components for Cummins QSL Engines

Keep your cooling system running smoothly with aftermarket engine water pumps, featuring:

  • High-flow designs to maintain optimal coolant circulation.

  • Corrosion-resistant materials for long life.

  • Available gaskets, seals, and hardware for complete installation.

4. Marine Water Pumps and Related Components for Cummins QSL Engines

Our aftermarket marine water pumps are engineered for saltwater use, including:

  • Corrosion-resistant housing and impellers.

  • Impeller kits and seal replacements.

  • Designed to deliver consistent cooling performance in harsh marine environments.

5. Cylinder Heads and Related Components for Cummins QSL Engines

Choose from a range of aftermarket cylinder heads and components:

  • Complete cylinder heads with or without valves.

  • Replacement valves, springs, inserts, and head gaskets.

  • Precision-machined for optimal airflow and combustion efficiency.

6. Fuel Pumps and Related Components for Cummins QSL Engines

Ensure reliable fuel delivery with our aftermarket fuel pumps:

  • High-pressure mechanical or electric pumps.

  • Seals, gaskets, and mounting hardware for complete installation.

  • Designed for consistent flow and durability.

7. Turbochargers and Related Components for Cummins QSL Engines

Boost your engine’s power and efficiency with our aftermarket turbo solutions:

  • Turbocharger assemblies for enhanced airflow.

  • Gaskets, clamps, and intercooler hoses for secure installation.

  • Designed for improved performance and reduced turbo lag.

8. Oil System Components and Related Parts for Cummins QSL Engines

Maintain lubrication and cooling with our aftermarket oil system parts:

  • Oil pumps for consistent circulation.

  • High-efficiency oil filters and coolers.

  • Seals, gaskets, and pressure switches to maintain system integrity.

9. Crankshafts and Related Components for Cummins QSL Engines

Our aftermarket crankshafts provide a reliable core for engine performance:

  • Precision-ground crankshafts for smooth rotation.

  • Bearings, seals, and thrust washers to support longevity.

10. Camshafts and Related Components for Cummins QSL Engines

Ensure precise valve timing with our aftermarket camshafts:

  • Camshafts engineered for durability and accuracy.

  • Matching bearings, bushings, and gears for complete installation.

11. Piston Kits and Related Components for Cummins QSL Engines

Our aftermarket piston kits offer complete combustion solutions:

  • Pistons, rings, wrist pins, and cooling jets.

  • Available in standard and oversized configurations.

  • Designed for optimal compression and durability.

12. Connecting Rods and Related Components for Cummins QSL Engines

Connect power from pistons to crankshaft with aftermarket connecting rods:

  • Precision-machined rods for strength and fit.

  • Bearings, bolts, and hardware for secure assembly.

13. Exhaust Components and Related Parts for Cummins QSL Engines

Improve emissions control and performance with aftermarket exhaust components:

  • Manifolds, elbows, gaskets, clamps, and insulation wraps.

  • Stainless steel options for enhanced durability.

14. Gaskets and Related Seals for Cummins QSL Engines

Our aftermarket gasket sets ensure leak-free operation:

  • Complete sets for head, oil pan, exhaust, and intake.

  • Designed to withstand temperature and pressure fluctuations.

15. Sensors and Related Components for Cummins QSL Engines

Monitor engine health with aftermarket sensors:

  • Camshaft, crankshaft, temperature, and pressure sensors.

  • Engineered for reliable readings and system control.

16. Switches and Related Components for Cummins QSL Engines

Control vital systems with aftermarket switches:

  • Oil pressure, fuel pressure, and temperature switches.

  • Available with mounting hardware and wiring.

17. Manuals & Tools for Cummins QSL Engines

Simplify maintenance with our aftermarket tools and manuals:

  • Service manuals for comprehensive guidance.

  • Specialty tools like feeler gauges, impeller pullers, and wrenches.

18. Starter & Alternator and Related Components for Cummins QSL Engines

Ensure dependable power with aftermarket electrical components:

  • High-torque starters and high-output alternators.

  • Mounting hardware, connectors, and wiring harnesses.

19. Hose, Clamp and Related Components for Cummins QSL Engines

Secure fluid transfer with aftermarket hoses and clamps:

  • Durable coolant and oil hoses.

  • Heavy-duty clamps and adapters for leak-free connections.

20. Fuel Filters and Related Components for Cummins QSL Engines

Protect your fuel system with aftermarket filters:

  • Primary and secondary fuel filters with water separation capabilities.

  • Housings, seals, and brackets for complete system integrity.

Ordering Cummins QSL Engine Parts from Diesel Pro Power

Easy Online Shopping Experience

Our online catalog is intuitive and easy to navigate, with detailed product descriptions and compatibility guides. Simply select your engine model, browse categories, and add items to your cart.

Exceptional Customer Support

Our experienced customer service team is ready to assist you. Whether you need help identifying parts, placing an order, or troubleshooting an issue, we’re here to help. Contact us at 1-888-433-4735 or via our online form.

Fast, Reliable Shipping

We pride ourselves on our 24-hour worldwide shipping policy, ensuring that your Cummins QSL parts arrive as quickly as possible, no matter where your vessel is located.

FAQs for Cummins QSL Engines

  1. Are Cummins QSL engines designed for marine applications?
    Yes, Cummins QSL engines are specifically engineered for marine environments, delivering reliable performance for trawlers and commercial vessels.

  2. What are common signs that my Cummins QSL engine needs maintenance?
    Watch for power loss, overheating, fuel consumption changes, unusual noises, or coolant leaks—these can signal maintenance needs.

  3. How do I identify the correct parts for my Cummins QSL engine?
    Locate the engine’s serial number and consult our detailed catalog to ensure proper part selection.

  4. What makes Diesel Pro Power a preferred supplier for Cummins QSL parts?
    We combine a comprehensive parts inventory, fast shipping, and superior customer service to meet your needs quickly and reliably.

  5. How can I ensure the longevity of my Cummins QSL engine?
    Perform regular maintenance, use genuine replacement parts, monitor fuel and cooling systems, and promptly address any performance issues.

 

Engine Specifications & Applications of the Cummins QSL Engine

Overview

The Cummins QSL is a high-performance, heavy-duty diesel engine that delivers exceptional reliability, fuel efficiency, and power density. Part of Cummins’ Tier 3 and Tier 4-capable lineup, the QSL engine was developed for off-highway, marine auxiliary, and industrial use where consistent torque and emissions compliance are essential. With a displacement of 8.9 liters, the QSL is known for its robust construction, strong mid-range power, and modern electronic control systems.

Despite being electronically managed, the Cummins QSL still attracts a loyal following in the aftermarket due to its longevity, low total cost of ownership, and extensive OEM adoption. It’s an excellent platform for both new installations and repower scenarios in industries where emissions standards are a growing concern and downtime is not an option.

Cummins QSL Engine Specifications

Specification

Detail

Engine Type

6-cylinder inline, 4-stroke turbo diesel

Displacement

8.9 liters (543 cubic inches)

Bore x Stroke

114 mm x 145 mm (4.49 in x 5.71 in)

Aspiration

Turbocharged and charge air-cooled

Fuel System

High-pressure common rail (HPCR)

Emissions Compliance

Tier 3 / Tier 4 Final / Stage V

Power Output Range

250–400 HP (186–298 kW)

Peak Torque

1000–1300 lb-ft (1355–1760 Nm)

Governed Speed

1800–2200 RPM

Cooling System

Water-cooled

Oil Capacity

Approx. 11 gallons (42 liters)

Dry Weight

Approx. 1,750 lbs (794 kg)

Control System

Cummins ECM with full diagnostics

This engine is widely used in OEM and replacement roles, particularly where Tier 3+ compliance is required but maximum uptime and power delivery are non-negotiable.

Notable Features of the Cummins QSL

  • High-Pressure Common Rail (HPCR) system delivers precise fuel control for improved emissions and power.

  • Robust Block Design provides long-term durability under continuous load.

  • VGT Turbocharger (Variable Geometry Turbo) allows rapid throttle response and superior torque at low RPMs.

  • Integrated Electronic Control Module (ECM) provides diagnostics, efficiency tuning, and emissions management.

  • Extended Service Intervals reduce downtime and lower lifecycle costs.

Marine Applications of the Cummins QSL Engine

While more commonly used in industrial and power generation roles, the Cummins QSL also has a significant presence in the marine sector—particularly for auxiliary applications and select propulsion roles.

Marine Use Cases

  • Marine Generator Sets (Gensets)
    The QSL’s governed speed and excellent fuel control make it ideal for 60Hz and 50Hz marine generators. It is used widely on ferries, commercial trawlers, and offshore support vessels for auxiliary power.

  • Hydraulic and Pump Drives
    QSL engines are employed to power hydraulic systems for cranes, winches, and thrusters. Its steady torque and high fuel efficiency make it a dependable auxiliary engine for shipboard operations.

  • Emergency or Standby Marine Systems
    The QSL provides reliable operation for emergency bilge pumps, fire suppression pumps, or backup generator units, especially in newer fleets that require Tier 3 or Tier 4 emissions compliance.

  • Propulsion (Selective Use)
    Some low-speed, mid-sized commercial boats use the QSL for main propulsion, particularly in markets with emissions mandates that prohibit older mechanical engines.

Marine Advantages

  • Excellent low-end torque for hydraulic system applications.

  • Quiet operation with reduced vibration.

  • Full ECM integration allows vessel-wide diagnostics and performance monitoring.

  • Available in both keel-cooled and heat exchanger variants.

Industrial Applications of the Cummins QSL Engine

In industrial markets, the Cummins QSL has become a standard for Tier 3 and Tier 4 operations in demanding environments. Its strong torque curve, rugged components, and electronic fuel system make it ideal for continuous-duty and load-bearing applications.

Power Generation

  • Prime Power & Standby Gensets
    The QSL is a favored engine for commercial and industrial generator sets, especially those operating in construction, remote sites, and critical infrastructure such as hospitals and data centers.

  • Mobile Generator Systems
    Rugged enough for trailer-mounted power systems used in disaster relief, mining camps, and mobile telecom infrastructure.

  • Load-sharing Installations
    The QSL supports load-shedding systems in hybrid and multi-unit installations due to its ECM-controlled governor and consistent RPM stability.

Construction Equipment

  • Found in high-performance equipment such as:

    • Wheel Loaders

    • Excavators

    • Cranes

    • Pavers

    • Graders

Its variable turbo and strong torque curve make it particularly well-suited to heavy-duty equipment that must perform in both low-speed and high-load scenarios.

Agriculture & Irrigation

  • Diesel Water Pumps

  • Stationary Engine Power Units

  • Field Power Systems

The engine’s ability to operate long hours at a fixed RPM, coupled with its emissions compliance, make it ideal for modern large-scale agricultural operations

 

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