3116 Caterpillar Diesel Engine Specifications

by Chester Rockwell
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The Caterpillar 3116 is a turbocharged diesel engine used for marine propulsion. It can be used alone or in tandem to power boats and is compatible with a number of different Caterpillar marine transmissions that can provide faster or slower acceleration depending on a vessel's intended use. The transmission chosen can also change the engine's overall size and weight, with faster transmissions adding the most weight and size.

Standard Equipment

Standard equipment on the 3116 engine includes the alternator, the flywheel and the cooling system, among other features. Keeping vibration and movement to a minimum is an onboard torsional vibration damper. The alternator is a belt-drive 12-volt unit capable of outputting 51 amps. The included cooling system includes oil coolers for both the engine and transmission, an auxiliary sea water pump, an expansion tank, and a water-based cooler for the exhaust manifold.

Engine Design Specifications

Powering the 3116 four-stroke diesel engine are six inline cylinders with bores of 4.13 inches and strokes of 5 inches. The engine's overall displacement is 402 cubic inches; its compression ratio is 16 to 1. The 3116 is capable of generating peak power levels of 205 horsepower at 2,400 rpm and 350 horsepower at 2,800 rpm. Its overall fluid capacity is 6.6 gallons for engine oil and 7.4 gallons for the engine's cooling system. Total dry weight of the 3116 is reported at 1,500 pounds. With the base model transmission installed, the engine is 63.2 inches long, 33.8 inches high and 32.1 inches of width.


The base model marine transmission, the MG5050, adds a weight of 189 pounds to the 3116 engine and 2.3 inches of length, offering variable-speed gear ratios of 1.53 to 1, 2.04 to 1 and 2.43 to 1. The fastest transmission, the MG507-1, is also the heaviest, weighing in at 350 pounds but adding no extra length. This transmission features variable speed gear ratios of 1.5 to 1, 1.98 to 1, 2.54 to 1 and 2.99 to 1.

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