Engine Specifications for a Westerbeke 4-107

by Solomon Poretsky
itstillruns article image
sailboat image by pearlguy from Fotolia.com

The Westerbeke 4-107, also known as the Four-107, is an inline four-cylinder diesel engine designed for marine applications. Made by the J. H. Westerbeke Corporation of Boston, Massachusetts, the Four-107 is designed for use in sailboats although it can work in just about any type of marine vessel. One of its defining features is its relatively small size and low weight, making it easy to install and extremely flexible in its use.


Designed to fit in the tightest of engine compartments, the Westerbeke Four-107 measures 20 3/4 inches wide, and 26 1/4 inches tall. Although its length can vary based on which reduction gear is installed, the engine itself is 34 inches long with the gears adding anywhere from 5 1/16th to 7 inches of length. Direct drive models weigh 475 lbs., and a reduction gear adds an additional 20 lbs.


When turning at its maximum continuous speed of 3,000 revolutions per minute, the Westerbeke 4-107 generates 40 horsepower. At that speed, it consumes only 1.3 gallons of diesel fuel per hour, on average.

Engine Specifications

The Westerbeke Four-107 is a four-cycle engine with four in-line cylinders. Each cylinder has a 3 1/8 inch bore and a 3 1/2 inch stroke. The engine has a total displacement of 107 cubic inches, or approximately 1,750 cubic centimeters.

Standard Features

Westerbeke ships this engine with a 14 ampere generator, although more powerful alternators are also available. It has a freshwater cooling system with a heat exchanger, and features filters for both fuel and lubrication oil. As shipped, it is designed to rotate a left hand propeller.


The 4-107's cylinder block and cylinder head are made from a single piece of alloy iron. Its pistons are made of a lightweight aluminum alloy and the crankshaft is forged chrome molybdenum steel.

More Articles

article divider