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CAT 3306 Engines

Caterpillar 3306 Engines For Sale

Big Bear Engine Company Warranty SealThe old adage, “If it ain’t broke don’t fix it.” still rings true today with the Caterpillar 3306 Engine. You can’t go wrong with this perfectly engineered engine. For over 40+ years this engine continues to power America. It is known for its reliability, easy maintenance and stamina to get any job. This engine will easily go 1,000,000 miles before major overhaul.

Our component build CAT 3306 Engines have improved the original design to achieve more horsepower, better torque and fuel economy. The extended long blocks are built with mostly brand new parts, exactly to OEM specifications and come with an industry leading warranty. Some non wearable parts are rebuilt from cores such as inlet and outlet connections, aftercoolers, solenoids etc... Note these are aftermarket hybrid units built to 9Y Arrangement legacy specifications. The 9Y Arrangement is a good replacement for around 20+ popular dozers, scrapers, tractors, wheel loaders, dump trucks, compactors and rollers.

CAT 3306 Extended Long Block Engines:

Our 3306 component built engines also known as (extended long blocks) come with most everything you need to replace your existing failed engine. These industrial rated CAT 3306 Engines are built with brand new aftermarket and OEM ISO 9001 parts, to exact OEM tolerances and have less than a 1% parts failure rate. As a guide an extended long block is roughly 75% of a complete build out and is a perfect solution for a customer who has an existing 3306 but experienced some internal catastrophic failure. Most customers will merge the extended long block with still workable parts from their old engine. In addition to our extended long blocks we also offer standard remanufactured long blocks built to your serial number. A traditional reman 3306 is more suitable if you have an older PC (Pre Combustion Chamber) model vs. the DI (Direct Injected). Our extended long block 3306DI Model engines include:

• Block
• Cylinder Head
• Camshaft and Lifters
• Crankshaft
• Connecting RodsCAT 3306 Surplus Engine
• Rocker Assemblies
• Gaskets, Liners, Rings, Seals, Wrist Pins, Bearings
• Injectors
• Oil Pump and Water Pump
• Oil Cooler
• Oil Filters
• Intake and Exhaust Manifolds
• Housings (Front and Rear)
• Brackets and Pullys
• Fuel Injector Pump
• Turbo
• Oil Pan
• Standard 12 Months Parts Replacement Warranty
• 1 and 2 Year Extended Parts/Labor Warranties Also Available

CAT 3306 Engine History

Ask any old time trucker about the CAT 3306 and they will all tell you the same thing: the old girl is reliable. The Caterpillar 3306 Engine remains one of the best designed and dependable engines Caterpillar ever produced. The engine is a 10.5 L inline six cylinder diesel or natural gas engine.

The engine was first manufactured in the early 1970s replacing the older 1673 and 3160 models. The CAT 3306 was first widely used in the CAT 225 Excavator in 1973 and was manufactured all the way up until the late 1990s whenAERA Association Member emissions technology changed. The C7 and C9 replaced the 3306 starting in 2004 when Tier III and Tier IV emissions requirements became standard.

The CAT 3306 are known to be for their reliability due to the uncomplicated design. The earlier versions were equipped with the precombustion chambers and later replaced with direct injection. The newer left hand scroll fuel system are also very reliable versus the older sleeve metering fuel systems.

The 3306 won’t win any races but it is a heck of a workhorse producing 563 – 967 ft/lbs. of torque. Modern CAT 3306s with injector and turbo upgrades will over 1000 ft/lbs. of torque. Consequently, modern CAT 3306 engine’s average horsepower ratings are between 218 – 360 hp with turbo and injector performance upgrades.

The original models averaged much lower horsepower ratings between 180 – 200 hp with most later models maybe getting 270 hp on a good day. The original max horsepower rating was 270 hp (JWAC Jacket Water After Cooled) and 300 hp ATTAC (Air to Air After Cooled) at the end of the engine’s lifecycle. The original CAT 3306 is similar to the CAT 3406 except it only has 2 valves per cylinder vs. the 4 with the 3406. All new CAT 3306DI engines have 4 valves per cylinder. The original indirect injection engines average 8 – 11 gallons of diesel fuel per hour but modern direct injection CAT 3306s average much better GPH ratings. Unlike the CAT 3406, the CAT 3306 natural gas application is just as durable as the diesel version.

The CAT 3306 engine was a workhorse in the Caterpillar heavy duty diesel engine lineup for than 25+ years and was mass produced in quantity. The engine was installed in in a lot of D6 and D7 Dozers, 12G, 14G and 140G Motorgraders but is also found in everything from rollers, scrapers, excavators, dump trucks, cement mixers, gensets, front end loader and industrial pumps. Back in the 1970s and 1980s the engine was installed in all of the major truck manufacturers such as Peterbuilt, Kenworth and Freightliner. Those engines would have never made the cut today as much more powerful engines are installed in Class 8 Over-the-Road Vehicles. The engine is also found in a lot of vocational trucks, step vans, delivery vehicles and bread trucks. The CAT 3306B was a huge hit in the marine industry and was successfully installed in millions of small boats from tugs, dredges, ferries, pump boats, drifters, trawlers and fireboats.

Caterpillar 3306 Specs

Engine Data

Configuration Inline 6 Cylinder
Displacement 10.5 L, 638 cubic inches
Bore x Stroke 4.75" x 6.00"
Cylinder Head Cast Iron
Engine Block Cast Iron
Firing Order 1-5-3-6-4-2
Compression Ratio 15.0 : 1
Injection Direct Injection
Aspiration Turbocharged Aftercooled
Valve Train OHV, 2 valves per cylinder
Weight 2265 lbs (Dry)
Oil Capacity 10.25 Gallons
Governor Hydramechanical or PSG
Horsepower 230- 350 hp @ 2300 rpm
Torque 585 lb-ft @ 2000 rpm


Give us a call today at 844-340-4114 for immediate sales and support for the Cummins 4BT, Cummins 6BT or CAT 3306. If you have any questions check out our FAQ Page. We are always ready to help or just listen to your crazy off-roading adventures!

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