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The Cummins ISB 4.5 engine stands out as a workhorse across marine and industrial applications, offering a balance of power, reliability, and efficiency. At Diesel Pro Power, we understand how critical this engine is to your operation—whether it powers a vessel or industrial equipment. That’s why we provide premium replacement and upgrade parts for the Cummins ISB 4.5, backed by global 24-hour shipping and unparalleled customer support. The ISB 4.5 engine is a mid-range diesel engine developed for marine propulsion, generator sets, and various off-highway industrial uses. Known for its compact build and robust torque curve, it offers dependable performance in a range of configurations. Features such as high-pressure common rail (HPCR) fuel systems, electronic engine management, and low emissions make it a favorite among engineers and operators alike. If your ISB 4.5 requires a full overhaul, Diesel Pro Power has the complete kits needed to get the job done. Our kits include: Upper Gasket Kits: All essential gaskets to reseal your engine’s top end. Lower Gasket Kits: Crucial for maintaining oil pan and crankcase integrity. Full Engine Rebuild Kits: Pistons, rings, liners, bearings, gaskets, and seals—all in one comprehensive package. Complementary Fluids and Cleaners: Cooling system treatment, radiator flush, and oil system cleaners for a professional finish. These kits are designed to OEM standards and packaged for convenience, eliminating guesswork and ensuring a complete restoration. Cooling is essential for peak performance. Choose from: Fresh Water Pumps: Built to handle the thermal demands of continuous use. Pump Seals and Repair Kits: Replace just what’s worn—perfect for routine maintenance. Drive Belts for Alternators and Fans: Engineered for long life and smooth operation in harsh environments. [Internal Link Placeholder for Cooling System Maintenance Blog] Cylinder heads are critical for compression, combustion, and emissions control. Our selection includes: Remanufactured Cylinder Heads: Pressure-tested, machined, and ready to install. Valve Springs, Keepers, and Retainers: Factory-spec replacements for reliable sealing. Intake and Exhaust Valves: Hardened for durability under marine and industrial loads. Each head is inspected to ensure integrity and compatibility with ISB 4.5 block configurations. Fuel efficiency and injector timing are the heart of performance. We offer: Fuel Pumps (Mechanical and Electronic): High-pressure delivery for complete atomization. Injection Pump Gasket Kits: Ensure leak-free operation and consistent performance. Fuel Filters and Water Separators: Protect your system from contaminants and corrosion. [Internal Link Placeholder for Fuel System Diagnostics Guide] The crankshaft is the foundation of your Cummins ISB 4.5 engine’s rotating assembly. It transforms the up-and-down motion of the pistons into the rotational power that drives your vessel or industrial machinery. At Diesel Pro Power, our crankshafts are engineered for long-lasting durability and smooth operation, even under high-load conditions. To support a full bottom-end overhaul, we also carry: Main Bearings and Rod Bearings – Precision-fit components that ensure consistent lubrication and minimal wear. Thrust Washers – Protect the crankshaft from axial movement and maintain proper endplay. Crankshaft Seals – Essential for preventing oil leaks and safeguarding internal components from contamination. These components are manufactured to meet or exceed OEM specifications, giving you peace of mind with every repair or rebuild. The camshaft is critical for controlling the timing and lift of your engine’s intake and exhaust valves. In the Cummins ISB 4.5 engine, precise camshaft function ensures optimal air/fuel combustion and exhaust flow, directly impacting power output and fuel efficiency. Diesel Pro Power provides camshafts specifically designed for ISB 4.5 engine configurations, offering: Timing Gears – Matched to ensure proper synchronization between the camshaft and crankshaft. Camshaft Bearings – Designed to handle the high loads of marine and industrial engine cycles. Valve Train Components – Including lifters, rocker arms, and pushrods to complete your top-end system. All components are built for rugged conditions and are ideal for maintaining engine integrity in both preventative and corrective maintenance operations.  Everything is aligned to strict OEM specifications to reduce friction and wear over time. Keep your marine application responsive and intuitive with: Throttle and Shift Cables Control Levers Remote Start Switches These parts ensure seamless command of the engine’s output from any helm station. We stock a wide array of ISB 4.5 electronic components, including: Oil Pressure Sensors Water Temperature Sensors ECU Modules and Wiring Harnesses All sensors are marine-grade and resistant to moisture, vibration, and corrosion. Professionals and fleet operators alike benefit from having the right tools on hand: Feeler Gauge Sets: Ideal for valve adjustments during top-end rebuilds. Fuel Filter Wrenches: Eliminate the struggle of changing out cartridges. Impeller Pullers: Speed up raw water pump maintenance. Oil Filter Wrenches: Compatible with a range of Cummins marine filters. These tools help ensure precision maintenance and reduce labor time during routine services. From tugboats to yachts, the ISB 4.5 engine powers a wide variety of vessels thanks to its: Compact footprint Clean emissions profile Strong low-end torque It also excels in: Construction Equipment Agricultural Machinery Stationary Power Generation Operators trust the ISB 4.5 for its durability and minimal downtime across demanding environments. No matter where you’re located—on land or at sea—our team ships Cummins ISB 4.5 parts within 24 hours, ensuring minimal operational delay. Our customer service team includes diesel engine experts. We’ll help you: Identify the correct parts Provide installation advice Offer maintenance recommendations Whether via phone, email, or live chat, we’re here to help you every step of the way. With over 40,000 + satisfied customers worldwide, our reputation is built on: Genuine parts Fast shipping Transparent support Real-world marine and industrial experience The Cummins ISB 4.5 is a compact, high-performance, electronically controlled diesel engine designed for modern industrial and marine applications. Developed as a smaller counterpart to the larger ISB 5.9 and ISB 6.7 engines, the ISB 4.5 brings the same durability, fuel efficiency, and compliance with stringent emissions regulations—but in a more space-efficient and lighter package. This engine is especially well-suited for medium-duty equipment, auxiliary marine power, construction machinery, and mobile gensets where power, emissions compliance, and footprint must all be balanced. Featuring high-pressure common rail fuel injection, advanced turbocharging, and fully integrated electronic controls, the ISB 4.5 engine offers a powerful, modern solution for users needing a versatile engine that meets Tier 3 and Tier 4 Final emissions standards without compromising performance. Its design prioritizes uptime, serviceability, and torque output, making it a favorite among equipment manufacturers and aftermarket rebuilders alike. Specification Detail Engine Type 4-cylinder, inline, 4-stroke diesel Displacement 4.5 liters (275 cubic inches) Bore x Stroke 4.02 in x 4.88 in (102 mm x 124 mm) Aspiration Turbocharged and Aftercooled Fuel System High-Pressure Common Rail (HPCR) with ECM Valvetrain OHV, 4 valves per cylinder Compression Ratio 17.3:1 Power Output 130–210 HP @ 2,600–2,800 RPM Peak Torque 400–520 lb-ft @ 1,600 RPM Cooling System Liquid-cooled with belt-driven water pump Lubrication Capacity Approx. 11 quarts (10.5 liters) Dry Weight ~775–850 lbs (352–386 kg) Emissions Certification EPA Tier 3 / Tier 4 Final, Euro Stage IV–V Engine Control Full-authority ECM with CAN-bus communication The ISB 4.5 combines the durability of cast-iron block and head design with the sophistication of electronic fuel management. Its compact architecture allows easy installation in tight engine bays while still delivering the torque needed for demanding mechanical loads. High-Pressure Common Rail (HPCR) Fuel System: Enables superior combustion efficiency and fuel atomization, translating to better performance, lower emissions, and reduced noise. Full-Authority Electronic Control Module (ECM): Provides precise fuel delivery, load balancing, self-diagnostics, and data logging via CAN bus, facilitating remote monitoring and fleet management. Compact Footprint: Smaller than traditional inline-six engines, allowing for integration into smaller gensets, mobile units, or auxiliary marine machinery. Robust Turbocharging & Aftercooling: Delivers efficient power and responsiveness, even at lower RPMs, with improved engine breathing and thermal management. Emissions Compliance: Offers Tier 4 Final and Stage V readiness, making it acceptable in regulated markets like the U.S., Canada, and the EU. Low NVH (Noise, Vibration, Harshness): Advanced design reduces overall vibration, enhancing operator comfort and protecting surrounding systems. The ISB 4.5’s balance of size, emissions compliance, and performance makes it suitable for a wide variety of aftermarket repowers, gensets, auxiliary marine systems, and mobile equipment. It excels in duty cycles where consistent mid-range power and fuel economy are critical. The ISB 4.5 is frequently used in marine auxiliary systems, including onboard generator sets and hydraulic systems on vessels requiring low-emissions, electronically managed power solutions. Its size and emissions profile make it ideal for Tier 4-compliant vessels and retrofits. Marine diesel gensets for yachts, crew boats, and work vessels Power units for hydraulic cranes, winches, or thrusters Desalination systems and utility pumps Support equipment for harbors and drydocks Vessel heating, refrigeration, or fire suppression systems The engine’s compact form and low emissions output make it a favored choice for repowers in vessels operating in emissions-controlled waters or looking to future-proof their auxiliary power systems. Due to its Tier 4 compliance, the ISB 4.5 is used across stationary generator installations and trailer-mounted mobile gensets designed for use in environmentally sensitive zones or commercial installations with strict air quality standards. Mobile field power units (80–125 kW range) Backup generators for healthcare and telecom facilities Prime power in construction job sites or oilfields Emergency response and disaster recovery power trailers Export gensets to regulated markets (Europe, Canada, Australia) Its electronic governor and ECM capabilities allow the ISB 4.5 to maintain consistent RPM and voltage stability, making it ideal for environments with sensitive electrical demands or variable loads. The ISB 4.5 is increasingly found in mid-size construction equipment, especially in applications where space and emissions compliance are top concerns. With solid torque output and responsive acceleration, it serves operators in tight urban work zones and rugged off-road conditions alike. Skid steers and compact track loaders Mid-size excavators and backhoes Aerial lifts and material handlers Utility service vehicles and mobile cranes Mobile lighting and compressor units The combination of torque, electronic control, and compact size enables OEMs and aftermarket rebuilders to deploy the ISB 4.5 in a variety of niche roles that were previously underserved by older, less efficient diesel engines. In agricultural use, the ISB 4.5 brings reliable power to small- to mid-scale irrigation systems, feed handling equipment, and mobile farm utilities. Its emissions profile is particularly attractive for use in states and countries where Tier 4 Final engines are mandated. Diesel-powered irrigation pump engines Grain auger and conveyor drives Mobile generators for barns or workshops Biofuel production system engines Orchard sprayer and fertilizer cart propulsion For farmers and agri-businesses aiming to meet sustainability goals while reducing fuel costs, the fuel-efficient ISB 4.5offers a long-term, low-maintenance solution. Smaller oilfield and mining equipment now incorporate the ISB 4.5 in support roles where Tier 4 emissions compliance and compact installation are required, especially for equipment operating near populated areas or protected land zones. Portable fuel or fluid transfer pump engines Lighting towers and mobile power sources Frac water heating and agitation units Hydraulic skids for pipe handling or snubbing Seismic and exploration support machinery Operators in these environments benefit from the robust diagnostics, field-serviceable design, and consistent performance of the ISB 4.5—even under demanding environmental conditions. Diesel Pro Power supports thousands of operators and rebuilders working with Cummins ISB engines, and the 4.5L variant offers distinct advantages for aftermarket applications: Emissions-Ready: Tier 4 Final compliance enables legal use in strict regulatory environments and simplifies permitting for new installations. Ease of Integration: Compact design, electronic controls, and standardized mounting make repowers and conversions more straightforward. Durability: The cast-iron block and robust internal components deliver long-term value and extended maintenance intervals. Electronic Monitoring: ECMs offer plug-and-play integration with telematics and fleet diagnostics platforms. Wide Availability of Parts: From sensors to injection systems, the 4.5 shares numerous components with larger ISB models, ensuring long-term service support. Fuel Efficiency: Designed with efficiency in mind, it reduces operational costs over thousands of hours of service. The Cummins ISB 4.5 engine delivers an ideal combination of compact size, power density, emissions compliance, and modern electronic management—qualities that make it a standout in today’s diesel engine marketplace. Whether you’re outfitting a marine genset, installing a mobile power unit, or retrofitting industrial machinery, the ISB 4.5 offers the performance, reliability, and compliance needed to meet the challenges of modern operations. With broad global support and a track record of success across sectors, the ISB 4.5 remains one of the most dependable and serviceable engines for mid-range applications. Diesel Pro Power offers comprehensive aftermarket support to help keep your ISB 4.5 running at peak performance, whether in the harbor, in the field, or at the job site.
Cummins ISB 4.5 Parts
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Why the Cummins ISB 4.5 Is a Preferred Engine
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Complete Engine Rebuild Kits for cummins ISB 4.5
Fresh Water Cooling Pumps and Components for Cummins ISB 4.5
Cylinder Heads and Valve Train Components for Cummins ISB 4.5
Fuel System Parts for Cummins ISB 4.5
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Crankshafts for Cummins ISB 4.5 Engines
Camshafts for Cummins ISB 4.5 Engines
Marine Cables and Engine Control Accessories For Cummins ISB 4.5
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Common Applications for the ISB 4.5
Marine Propulsion and Generators
Industrial Uses
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Engine Specifications & Applications of the Cummins ISB 4.5 Engine
Introduction
Cummins ISB 4.5 Engine Specifications
Key Features of the ISB 4.5
Marine and Industrial Applications of the Cummins ISB 4.5
1. Marine Auxiliary Power & Gensets
Common Marine Applications:
2. Mobile and Stationary Industrial Gensets
Industrial Power Applications:
3. Construction and Utility Equipment
Equipment Types:
4. Agricultural Power Units
Agricultural Applications:
5. Oilfield Utility Systems
Oilfield Use Cases:
Benefits for Aftermarket Users
Conclusion
