Description
About the 3306 Cat Engine for Sale
The used 3306 Cat engine for sale at Vaz Auto Solutions has become a popular choice for many heavy-duty diesel operators thanks to its high performance, legendary durability, and extensive parts availability compared to other engines in its class. Whether you’re in construction, mining, marine, agricultural, generator service, or older Class 8 trucking, the Caterpillar 3306 engine is a trusted workhorse that has powered countless industrial and commercial applications for over three decades.
The 3306 Family Position
The Caterpillar 3306 sits in the middle of Caterpillar’s traditional industrial / marine / on-highway diesel lineup:
- 3304 (smaller predecessor, 7.0L Inline-6)
- 3306 (THIS LISTING, 10.5L Inline-6), the workhorse mid-range diesel
- 3406A / 3406B / 3406C (larger 14.6L Inline-6 used in Class 8 trucks like the legendary 3406B)
- 3406E (electronic version of 3406, predecessor to C15)
In the modern Caterpillar lineup, the 3306 was effectively succeeded by the C9 (in industrial / marine markets) and ultimately by the C13 ACERT (in on-highway truck applications, though the C13 is significantly different architecture).
Why Choose a Used 3306 Cat Engine?
- Engine Configuration: Inline-six with 10.5-liter displacement. Direct injection system delivers better fuel economy and reduces cooling system load compared to pre-combustion chamber designs. Pre-combustion (3306PC) variants are also available for applications requiring that specific fuel system architecture.
- Durability: Constructed with a ribbed cast iron block and top-deck cooling shelf design for improved coolant circulation, ensuring stable engine temperatures even under sustained heavy loads. High manufacturing quality includes a boron steel forged crankshaft and cast aluminum pistons for low wear and long service duration.
- Maintenance and Serviceability: Mechanical fuel system with externally accessible injectors that are easily serviced. Many accessories are directly engaged with gears (water pump, oil pump), reducing belt-driven maintenance requirements and improving long-term reliability.
- Performance: Single fixed-geometry turbocharger (on turbocharged variants) provides consistent power delivery. Management electronics (on 3306C and later production variants) optimize efficiency and fuel consumption while providing diagnostic capability.
- Versatile Applications: Widely used across construction, mining, agricultural, marine, generator, and on-highway truck sectors due to its excellent performance and adaptability across duty cycles.
- Longevity: Engineered for sustained service of approximately 1,000,000 miles or 20,000 to 30,000 operating hours before requiring a major inframe rebuild. This longevity is the foundation of the 3306’s enduring market reputation.
- Cost-Effective: A used 3306 represents significant savings compared to purchasing a new or remanufactured engine while delivering comparable remaining service life when properly inspected and maintained.
- Reliability: Caterpillar engines are renowned for their robust performance and longevity, and the 3306 is one of the most-respected examples in the Cat lineup.
- Availability: Used 3306 engines and parts are widely available across North America, reducing lead times and parts cost for your project.
3306 Variants Available
We offer several 3306 variants depending on your application requirements:
| 3306 NA (Naturally Aspirated) | The base 3306, approximately 218 hp. Used in lower-load industrial and marine applications. |
|---|---|
| 3306T (Turbocharged) | Turbocharged 3306, approximately 245-270 hp. Used where higher power output is required. |
| 3306B | The most common 3306 variant, generally turbocharged, with proven reliability across construction, marine, and on-highway truck applications. |
| 3306C | Electronic-control variant of the 3306, with Cat ECM for diagnostic and emissions optimization. |
| 3306PC (Pre-Combustion Chamber) | Pre-combustion chamber fuel system, used in some industrial and marine applications. |
| 3306DI (Direct Injection) | Direct injection variant emphasized in many on-highway truck and modern industrial applications for improved fuel efficiency. |
The 3306 Engine Fits
Construction Equipment:
- Caterpillar 235 / 245 hydraulic excavators
- Caterpillar D6 / D7 dozers
- Caterpillar 966 / 980 wheel loaders
- Compactors and scrapers (various Cat models)
Agricultural Machinery:
- Challenger MT800 series tractors
- Claas Lexion harvesters
- Various large agricultural equipment
Mining Equipment:
- Large haul trucks (mid-size mining applications)
- Mining excavators and loaders
Marine Applications:
- Tugboats and workboats
- Commercial fishing vessels
- Mid-sized recreational yachts
- Various marine propulsion installations
Industrial Applications:
- Caterpillar 3306 generator sets (prime and standby power)
- Industrial pumps (well-service, irrigation, dewatering)
- Air compressors (Sullair and similar industrial compressor packages)
Transport Vehicles:
- Older Class 8 trucks (Peterbilt, Kenworth, Mack with Cat 3306 option)
- Dump trucks and specialty trucks
- Vocational truck applications
Condition and Quality Assurance
When you purchase a used 3306 Cat engine for sale from Vaz Auto Solutions, you can rest assured about the quality and condition of the engine. Our used engines undergo rigorous testing and refurbishment to meet industry standards. Quality measures include:
- Thorough Inspection: Every engine is meticulously inspected for defects or wear
- Performance Testing: Engines are bench-tested where possible to verify operational efficiency
- Variant Authentication: Specific 3306 variant (NA / T / B / C / PC / DI) is documented for ECM and application compatibility
- Donor Application Documented: Construction equipment, generator, marine, agricultural, or on-highway truck origin verified
- Hours / Mileage Documented: Where verifiable from donor records
For precise pricing and availability, please contact us directly at (240) 301-0095.
Here at Vaz Auto Solutions, you’ll find the best quality used 3306 engine for sale at a very reasonable price. Grab onto this absolute power of an engine, the legendary million-mile Caterpillar 3306.
Signs You Need a Replacement 3306
- Loss of compression on one or more cylinders
- Mechanical injection pump or injector failure
- Turbocharger failure (on turbocharged variants)
- Cylinder head crack symptoms (coolant in oil, white smoke, overheating)
- Connecting rod or main bearing knock under load
- Excessive blow-by or oil consumption
- Donor equipment retired and the 3306 is being moved to another chassis or application
- Generator or industrial repower project requiring proven Cat reliability
- Marine repower (commercial fishing, tug, yacht) requiring 3306-specific engine bed dimensions
Common 3306 Maintenance Considerations
- Oil and filter changes: Every 250 to 500 operating hours for industrial / marine / construction applications, or every 25,000 to 50,000 miles for on-highway truck applications
- Fuel filters: Critical for mechanical injection pump longevity, change at every oil interval
- Cooling system: Use Cat-approved coolant or compatible heavy-duty extended life coolant; service every 2-3 years
- Valve adjustment: Periodic valve clearance check per Cat operating manual
- Injector service: Have injectors flow-tested at major service intervals; replace as needed
- Turbocharger inspection: Check shaft play and exhaust housing condition periodically (turbocharged variants)
What Is Included, What Is Not Included
| INCLUDED | Long block: ribbed cast iron block, boron steel forged crankshaft, connecting rods, cast aluminum pistons, camshaft, cast iron cylinder head, valve train, oil pan, valve cover. Mechanical injection pump and injectors typically included from donor where applicable. Turbocharger typically included on turbocharged variants. |
|---|---|
| NOT INCLUDED | ECM (sold separately on electronic 3306C variants), wiring harness, intake manifold (typical), exhaust manifold (typical), starter, alternator, A/C compressor, water pump (sometimes), thermostat, oil cooler, transmission, motor mounts. |
| Fluids | Drained before shipping. Refill with Cat-approved 15W-40 diesel-spec engine oil or compatible API CK-4 / older spec per donor application. |
| Provenance Note | Donor application disclosed (construction, generator, marine, agricultural, on-highway truck). Variant authenticated for ECM compatibility where applicable. |
| Core Note | No core charge. You are not required to return your old engine. |
Vehicle Compatibility
The Caterpillar 3306 was used across an extraordinarily diverse range of platforms:
| Caterpillar Construction Equipment | CAT 235 and 245 excavators, D6 and D7 dozers, 966 and 980 wheel loaders, compactors, scrapers |
|---|---|
| Caterpillar Generator Sets | 3306 GenSet (prime and standby power), various industrial power packages |
| Marine Propulsion | Tugboats, fishing boats, mid-size yachts, commercial workboats |
| Agricultural Equipment | Challenger MT800 series tractors, Claas Lexion harvesters |
| Mining Equipment | Mid-size haul trucks, mining excavators and loaders |
| Industrial Equipment | Gardner Denver and Sullair pumps, industrial compressor packages |
| On-Highway Class 8 Trucks | Peterbilt, Kenworth, Mack, Freightliner with Cat 3306 engine option (older production) |
| Specialty Vehicles | Dump trucks, vocational trucks, fire apparatus, military vehicles with Cat 3306 option |
Variants exist with different ECM calibrations for industrial, marine, agricultural, and on-highway truck service. Tell us your application and we’ll match the appropriate 3306.
Condition and Inspection
Every used Caterpillar 3306 we ship goes through this process:
- All 6 cylinders compression tested, pressure per cylinder recorded
- Variant authenticated (3306 NA / T / B / C / PC / DI)
- Mechanical injection pump operation verified where possible
- Top-end inspection (heads, injectors, rocker arms)
- Turbocharger inspected for shaft play and bearing wear (turbocharged variants)
- Cylinder head visual inspection for cracks
- Donor application photographed and documented
- Approximate hours / mileage documented when verifiable from donor
Why Buy From Vaz Auto Solutions
- All 6 cylinders compression tested, results before you pay
- Variant authenticated (3306 NA, T, B, C, PC, or DI)
- Mechanical injection pump operation verified where possible
- Top-end inspection (heads, injectors, rocker arms)
- Turbocharger and aftercooler inspected (where applicable)
- Donor application traced across the 3306’s diverse deployment platforms
- Crated freight delivery to all 50 states for industrial / marine / Class 8 engines
- 15 day replacement warranty on internal defects
- Cat-experienced support team on the phone with knowledge of 3306 variant differences and the engine’s diverse applications
David Parker (verified owner) –
The 3306 Cat engine I bought from Vaz Auto Solutions was a great choice. It arrived quickly and was easy to install with clear instructions. Since installing it, the engine has been running smoothly without any issues. I’m impressed with the quality and service provided by Vaz Auto Solutions.
Marshall Wilson (verified owner) –
Vaz Auto Solutions delivered exactly what I needed with their 3306 Cat engine. It arrived promptly, was well-packaged, and installed without a hitch. The engine performs flawlessly, and I’m satisfied with the overall experience. I would recommend them for anyone looking for reliable auto parts.