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Improved Marine Diesel is Simple in Design | and Dependable in BY R. H. BACON a boat there are two major fac- tors which must receive careful consideration. The first of these is the over all cost of operation, and the second is the dependability of the par- ticular type of power which is to be used. The diesel engine has shown that it will operate at a very low I: THE selection of an engine for SECTIONAL VIEW OF THE NEW TYPE FAIRBANKS, MORSE & CO. DIESEL ENGINE FOR MARINE SERVICE fuel and labor cost but there is still a doubt in the minds of some boat owners as to whether the Diesel en- gine can be counted upon to operate R. H. Bacon is a member of the staff of the Diesel Engine division of Fairbanks, Morse & Co., Chicago. Operation year after year without loss of time or without high maintenance costs. Without dependability, low fuel consumption and a minimum person- nel are not of much value, for the cost of a few service interruptions. will offset any gain in reduced operating costs. As a matter of fact, however, a high grade Diesel engine is an ex- tremely dependable machine. The main- tenance costs are low and the life of the equipment is long. When the diesel engine was first developed, and during the early years of its use, some mechanical troubles were experi- enced. Such failures, however, are matters of history. The improvements in diesel engine design and manufac- ture have been fully as great as in the automobile engine and it is as unfair to compare the present day marine oil engines with the early types as it would be to compare the modern automobiles with those of an early era. is shown Two Cycle-Solid Injection One of the advances which have been made in diesel engine practice has been in the development of the two cycle airless injection type on ac- count of the mechanical and operat- ing simplicity of this design. The four cycle engine requires both inlet and exhaust valves, which require care in setting to produce the best effi- ciency and they must be frequently ground in order to keep the engine in good operating condition. Low grades of fuel oil, particularly those of a heavy sticky consistency, and thos2 20 Aft end of new Fairbanks, Morse Marine Diesel Engine— Built in starboard and port models for twin installations— View shown is of a starboard model—The Air Compressor the foreground—Circulating pump is at the right containing a considerable sulphur con- tent, cause trouble with the valves due to earbon or corrosion. The early diesel engines also re- quired the use of high pressure air for atomizing the fuel and this fur- ther complicated the construction. A multiple stage air compressor, which was necessary to furnish this high pressure air, added another feature of equipment to be looked after and the adjustment of the amount of air injected with the fuel required con- siderable care. The air injection en- gine has, of course, been improved in its mechanical design and is being used successfully, particularly in con- nection with large diesel engines. Both in this country and abroad, how- ever, the trend has been distinctly toward the development of two cycle airless injection types and it appears that the engine of the future, even in the larger sizes, will be of this type. Simplicity A Big Factor In order to understand the reasons which lie back of the simplicity of the two cycle airless injection diesel en- gine, it is necessary to have some idea as to how this type operates. The marine diesel engine, which has re- cently been developed by Fairbanks, Morse & Co., is an example of a late (Continued on Page 50) TO IRS a RR IT Ne et Te