Caterpillar 3304 Engine Specs

by Brianna Collins
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With a company history stretching back to the 1880s, Caterpillar was an industrial machinery, tractor and engine company with more than 80 years of engine manufacturing experience when it released the 3304 engine in 2009. This heavy-duty industrial engine operates on natural gas rather than diesel fuel.

General Engineering

This in-line, four-stroke-cycle engine from 2009 has a max brake horsepower of 95, a bore and stroke of 4.8 inches by 6.0 inches and a displacement of 425 cubic inches. It also features rich-burn combustion, a hydra-mechanical governor and a power density of 17.6 pounds per bhp. It has an oxygen rating of 2.0 percent.


While the 2009 Caterpillar 3304 is capable of 95 bhp at 100 percent workload, it has a power of 71 bhp when workload is reduced to 75 percent. It has an exhaust stack temperature of 1,018 degrees Fahrenheit at 100 percent workload and 984 degrees at 75 percent. Additionally, it has an engine speed of 1,800 revolutions per minute and a fuel consumption of 7,567 BTU per bhp-hour at 100 percent load and of 7,842 at 75 percent.


The 3304 engine measures 45.60 inches in length, 29.28 inches in width, 46.11 inches in height and has a dry weight of 1,670 pounds. It also has a jacket water capacity of 4.2 gallons, a lube-oil system refill of 8.3 gallons and an oil change interval of 250 hours.

Standard Equipment

Additional standard equipment for the 3304 includes an air cleaner with rain cap, a gear-driven jack water pump, an Altronic V ignition system and an instrumentation service meter. Other standard specs include an oil cooler, an oil filler and dipstick, mounting system engine supports and a shutoff protection system for added safety. It comes with a Cat Yellow paint job.

Optional Specs

Optional features for the Caterpillar 3304 include a battery charging system, ammeter gauge, positive locking control system, expansion tank and radiator. Other optional specs like blower fan, fan drive, mufflers for reduced noise, a wiring harness, auxiliary pump, flywheel stub shaft, an air pressure regulator, battery cables and relevant tool set are available for an additional charge.

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