Cummins marine engine

Types of Cummins Marine Engines

Cummins marine engines are designed to offer maximum power output with minimum fuel consumption. The primary types of Cummins marine diesel engines are as follows:

• QSB:

  Its small but mighty design allows the QSB5.9 to fit into various boat hulls. The usual power range is 160HP to 330HP, but it can provide up to 380HP for specific commercial vessels. Common uses include sport fishing, tug boats, and work vessels that operate in challenging conditions.

• QSC:

  The QSC8.3 has more power for bigger boats and jobs. With a larger size, it usually provides between 370HP and 600HP. You may find it powering larger sport fishing and tug boats, as well as some ferries and patrol boats.

• QSL:

  Even bigger, the QSL9.0 is for the most demanding marine jobs. Its heavy-duty build is suited for commercial, military, and cargo vessels on long journeys. Expect its power to be between 380HP and 600HP.

• QSK:

  Besides being more prominent, the QSK19 also offers more torque. With a block design that allows up to 38 liters of displacement, the QSK is the high-performance choice for maximum durability. In the high-performance category, the QSK stands out by giving users a winning choice. It has a record block design to provide a wide range of bore and stroke combinations to suit different needs and power requirements.

The other major models are:

• KTAA:

  A reliable work engine designed for boats used in demanding commercial fishing applications that need to endure daily use in harsh marine environments, like tugboats, ferries, and offshore supply vessels.

• ISX:

  An ultra-long-lasting engine that is an ideal choice for larger commercial boats, patrol vessels, and larger luxury yacht applications in the demanding marine environment that faces many daily challenges.

• ISM:

  A powerful high-performer built for the biggest jobs and demanding more significant commercial power requirements, including work boats, oil spill cleanup vessels, dredges, and cargo ships.

The strong focus on cutting exhaust emissions and fuel use means these marine engines must meet some of the world's most stringent marine emission regulations while continuing to provide maximum engine output and operational efficiency.

Specifications and Maintenance

The specifications of a Cummins marine generator vary depending on the model, but typical features include a 6.7L engine displacement, variable speed control, a direct injection fuel system, and a marine-grade cooling system.

Some common marine engine specifications are as follows. The engine model or type numbers are included in the specification lists.

• Density: The mass per unit volume is called density. Density compares the air and engine buoyancy to see how well it performs.
• HRR: This is the heat release rate measured during engine combustion. High or increasing HRR indicates powerful energy output.
• ISX CM850: This marine engine has a maximum output power of 322-626kw and an engine displacement of 15.0L.
• QSM11 CM870: This marine engine model has a maximum output of 746-1000kw. Its engine displacement is 11.8L.
• QSL9 CM871: This model has a maximum output power of 626-746kw and a displacement of 8.9L.
• QSM11 CM875: The QSM11 CM875 marine engine model has a maximum output power of 746-1000kw and an engine displacement of 11.8L.
• QSZ13.5: This model generates a maximum power of 1000-1300kw. It deserves mentioning that its engine displacement is 13.0L.
• QSK19: This powerful marine engine produces a maximum output power of 1560-2200kw and has a massive engine displacement of 19.0L.

Maintenance

Overall, a well-performed maintenance routine of a Cummins marine engine improves its performance and longevity. Some general maintenance tips are provided below:

• Refer to the user manual of the specific marine engine model. Follow the detailed maintenance instructions and schedule stated in the manual.
• Regular inspection of key components and parts of the engine, including the belts and hoses, fuel system, exhaust system, cooling system, electrical system, etc. Look for signs of wear and tear, damage or leaks, etc.
• Cleaning the marine engine on a regular basis is also necessary. Remove the salt buildup and other debris or deposits.
• Ensure the marine engine has adequate lubrication by regularly changing the oil and using the recommended oil products.
• Correctly adjust and periodically inspect the engine's settings while also checking its parameters to ensure smooth operation and optimal performance.
• Keep the marine engine's air intake systems clean and appropriately exchange air. Replace the air filters as required to avoid blockages and contaminants damaging the engine parts.

Uses of Cummins Marine Engines

Some common applications of the Cummins marine engine are as follows:

• Fishing Boats

  Cummins marine engines can be found in fishing vessels, such as trawlers and seiners. The commercial fishing industry uses these types of boats to catch fish in deep seas. Those fishermen rely on Cummins engines to guarantee that their boats are efficient and capable of handling various fishing activities.

• Tugs and Barges

  In order to haul heavy goods and containers, Cummins marine engines are employed in tugboats and barges. These workhorses travel through inland rivers and coastal waters, often pulling or pushing large ships. The durability and performance of Cummins engines ensure that tugboats and barges can operate even under heavy loads.

• Luxury Yachts and Ferries

  Cummins marine engines are often used in high-end yachts and passenger ferries. For these kinds of vessels, ride quality, smoothness, and comfort matter a lot. Also, they usually need to travel long distances. Cummins engines offer a quiet and comfortable driving experience along with long-distance travel capability.

• Workboats and Supply Vessels

  Workboats like platform supply vessels (PSVs) or anchor handling tug supply vessels (AHTS) also use Cummins marine engines. These boats operate on the high seas and are responsible for transporting supplies, equipment, and personnel to oil rigs and ships. Cummins engines provide the necessary power and reliability for workboats to perform their demanding offshore tasks.

How to choose a Cummins marine engine

• Determining vessel requirements:

  When choosing a Cummins marine diesel engine for a new vessel build or replacement in an existing vessel, it's essential to consider the purpose of the vessel. The vessel's type, size, weight, and operating speed need to be taken into account along with the seas and distances typically navigated. Depending on this, the power output of the engine must be sufficient but not excessive to achieve the desired speed and maneuverability while maintaining fuel efficiency and avoiding unnecessary costs and emissions.

• Considering engine types and fuel sources:

  Factors such as the vessel's weight, size, operating speed, and fuel efficiency need to be considered when choosing the engine type. A damp marine environment requires the engine to have rust-proof materials and water-resistant design features. Overall, the engine's reliable performance and reputation are crucial.

• Evaluating engine age and emission standards compliance:

  The engine's age is an essential aspect of its development. While older engines may be simpler and easier to work on, more critical components like the electronic control unit (ECU) and common rail fuel injection systems could require specialist knowledge and diagnostic tools. Therefore, it's necessary to consider whether the crew has the skills and equipment to maintain the engine correctly. Since stricter marine diesel engine emission standards are in place globally, mainly pertaining to nitrogen oxide (NOx) emissions, it is important to ascertain whether the engine complies with the applicable regional emission standards.

• Assessing maintenance and repair services:

  When considering the marine engine to be used, it's important to determine the level of maintenance required and the engine's repairability. The shipowner will need to establish a maintenance schedule and consider the engine's long-term susceptibility to wear and tear. While some engines may be prone to damage over time, others may be more enduring. Some engines may require specialized repairs and replacement parts sourced from niche suppliers, while others have widely available service parts. It's important to consider the supply chain's availability and compare it to the expected service life of the engine to make an informed decision.

Cummins marine engine FAQ

Q1. What is the function of a marine engine?

A1. A marine engine's primary function is to propel the vessel so that it can move through the water. Additionally, depending on the type and size of the vessel, a marine engine may also generate electricity for onboard systems and equipment, power the vessel's steering mechanism, and drive auxiliary equipment such as pumps and compressors.

Q2. What are the two types of marine engines?

A2. There are two primary types of marine engines: the inboard engine and the outboard engine. The inboard engine is installed inside the hull of the vessel and is typically based on automobile engines. On the other hand, the outboard engine is mounted outside the vessel, either at the transom or an engine well. It is a self-contained unit consisting of a gearbox, electric motor, and engine.

Q3. How long does a marine engine last?

A3. A well-maintained marine engine can last between 20 to 30 years. This is, of course, depending on factors such as the type of the engine, usage, and the quality of maintenance and care.

Q4. What is the horsepower of a marine engine?

A4. Marine engines are designed to produce power in terms of horsepower. The size and type of the vessel determine marine engine horsepower. A small boat may have a marine engine with 50 to 150 horsepower, while larger vessels, such as yachts and fishing boats, may have marine engines with 200 to 600 horsepower. Large commercial vessels, such as cargo ships and tankers, may have powerful marine engines ranging from several thousand horsepower to more than 10000 horsepower.