About the Caterpillar 3116 Engine

The 3116 Cat engine is a reliable, turbocharged diesel engine renowned for its robust performance in medium-duty applications. This engine is used in medium-duty trucks, buses, construction machinery, marine propulsion, and heavy industrial applications. If you're searching for a used 3116 Cat engine for sale, you've come to the right place. We offer a wide selection of competitively priced engines to meet your needs, with full donor application identification and inspection documentation.

The CAT 3116 Heritage

The Caterpillar 3116 was produced from 1987 through 1997 as Caterpillar's medium-duty Inline-6 diesel engine. The 3116 brought the proven Caterpillar engineering quality and dealer service network to the medium-duty market that had been dominated by Cummins B-series engines. The 3116 uses mechanical unit injection combined with turbocharging and aftercooling, delivering power output from 205 HP through 350 HP across the various configurations for trucks, buses, marine, and industrial applications.

In 1997, Caterpillar replaced the 3116 with the CAT 3126, which added HEUI (Hydraulic Electronic Unit Injection) fuel injection and a slightly larger 1mm bore for improved performance and emissions compliance. The 3126 was succeeded by the CAT C7 engine in 2003 (still in current production for marine and industrial applications), continuing the engineering lineage that began with the 3116.

Why Buy a CAT 3116 Engine

• Engine Design: 6-cylinder Inline configuration; turbocharged and aftercooled design; displacement of 6.6 liters (403 cubic inches), bore 4.13 inches, stroke 5.00 inches
• Power and Torque: Horsepower output ranging from approximately 205 to 350 HP; strong torque delivery (520-860 lb-ft) especially at lower RPMs, ideal for vocational and commercial applications
• Reliability and Durability: Robust Caterpillar engineering with rugged design; long expected service life under medium-duty conditions
• Fuel Efficiency: Optimized fuel consumption for medium-duty applications; balanced power-to-fuel efficiency ratio
• Emissions Control: Compliance with the EPA emissions regulations in effect during 1987-1997 production
• Serviceability: Caterpillar dealer network support remains strong; easy maintenance and service access
• Adaptability: Suitable for medium-duty trucks, buses, construction equipment, and marine applications; configurable to meet specific application requirements
• Cooling System: Efficient cooling system with belt-driven centrifugal water pump; maintains optimal operating temperatures even under sustained load

The 3116 Cat Engine Fits

The CAT 3116 powered a wide range of medium-duty equipment during its 1987-1997 production:

• Medium-Duty Trucks: International 4700 series, Ford LN series, Freightliner FL series
• Buses: Blue Bird TC2000, Thomas Built Saf-T-Liner MVP ER
• Construction Equipment: Caterpillar 416B Backhoe Loader, Caterpillar 926E Wheel Loader, Caterpillar D30D Articulated Dump Truck, Caterpillar 518 Skidder
• Marine Vessels: Bayliner 3488 Motor Yacht, Hatteras 38 Convertible Sportfish
• Specialty Vehicles: Pierce Arrow XT Fire Truck, Road Rescue Ambulance, various rescue and emergency response vehicles
• Industrial Applications: Stationary generators, irrigation pumps, air compressors

Performance and Efficiency

The CAT 3116 excels in medium-duty performance, offering superior torque and fuel efficiency for its displacement class. Designed to endure the rigors of intensive truck and bus duty cycles while maintaining optimal performance, the 3116 has earned its reputation in the medium-duty diesel market.

Life Expectancy and Maintenance

Maintaining a used 3116 Cat engine is straightforward thanks to its robust mechanical fuel injection design. With proper upkeep, these engines can last between 5,000 to 10,000 hours of service. Regular maintenance includes oil and filter changes, fuel filter replacement, periodic system checks, and proper cooling system service.

Comparisons: 3116 vs 3126 Cat Engines

Understanding the differences between the 3116 and 3126 Cat engines is important for buyers:

• 3116 (1987-1997): Mechanical unit injection, 4.13 inch bore, the original Cat medium-duty 6.6L
• 3126 (1997-2003): HEUI electronic fuel injection, 1mm larger bore (4.17 inch), slightly different ECU calibration, emissions-compliant successor
• C7 (2003-present): Modern successor of the 3126, currently produced for marine and industrial applications

Both 3116 and 3126 share the renowned Caterpillar durability and efficiency. The choice between them often comes down to ECU and fuel system compatibility with the donor equipment.

Customer Reviews and Testimonials

Many satisfied customers have shared their success stories using our used 3116 Cat engines. The consistent feedback points to high satisfaction rates regarding reliability and value compared to dealer reman pricing.

Vehicle Compatibility

Condition and Inspection

• Donor application confirmed (truck, bus, construction, marine)
• All 6 cylinders compression tested
• Unit injector condition documented
• Turbocharger condition assessed
• Aftercooler condition documented
• Oil pressure verified at idle and operating temperature
• Cooling system inspected
• Block visual inspection
• Donor application confirmed (truck, bus, construction, marine)
• All 6 cylinders compression tested
• Unit injector condition documented
• Turbocharger and aftercooler condition assessed
• Oil pressure verified
• Free crated freight to all 48 contiguous states
• 15 day replacement warranty on internal defects
• Caterpillar-experienced support team on the phone