Английский язык: Сборник текстов и упражнений для студентов специальности "Эксплуатация судовых энергетических установок". Писарева Л.П. - 51 стр.

                                         Lesson 21
                             Highly- Rated MAK Diesel Engine

       Machinenfabric Kiel introduced their most powerful engine, the M 55 IAK in 1966. The
maximum continuous rating has been increased more than two and a half. Modifications to the
cooling arrangements and running gear have been done. The engine is now offered with 6, 8
and 9 cylinders in- line and 12 & 16 cylinder in vee-form giving a range of unit powers from
2500 to over 10000 bhp.
       The basic design of this long-stroke 450 mm bore by 550 mm model is conventional. A
three-piece cast-iron frame, comprising bedplate sump, crankcase and entablature are secured
by long tie-bolts. The crankshaft has substantial overlap between the main journals and the
crankpins and is carried in thin steel bearings with a lead-bronze lining, nickel overlay and a
galvanised lead-tin running lining. Articulated connecting rods in the vee engines reduce the
engine length. One-piece oil-cooled aluminium alloy pistons are used, even for heavy fuel op-
eration when a two-ring insert and chrome-plated rings are fitted. To improve running of the
piston rings and reduce wear, the piston run in soft-nitrided cylinder liner.
       The cylinder head carries two inlet and two exhaust valves, the latter in water-cooled
cages with stellite-faced valve seats and chrome-plated stems. Hardened valve cams are shrink-
fitted on to the camshaft where as the fuel cam is adjustable. Reversible engines have cams
with double contours connected by helicale transition surfaces. These allow the camshaft to be
moved axially by hydraulic servo without the need to lift the tappet. L'Orange provides the fuel
injection equipment, well-suited to heavy fuel operation.
       Most of the components are easily accessible.
       The MAK M551AK engine has been chosen as the propulsion unit for cargo vessels built
in Germany.


                                   Words to be memorized

     powerful engine                        мощный двигатель
     to increase                            увеличить
     running gear                           передаточный механизм
                                            (ходовой механизм)
     conventional                           обычный
     sump                                   поддон, отстойник
     to secure                              крепить
     tie bolts                              анкерная связь
     overlap                                перекрытие, напуск
     journal                                шейка вала
     crankpin                               палец кривошипа, шатунная
                                            шейка каленвала
     overlay                                покрытие (лаком, краской)
     lining                                 прокладка; облицовка, заливка
                                            (подшипника)
     bearing lining                         антифрикационный слой
                                            подшипника
     articulated                            шарнирный
     insert                                 вставка
     wear                                   износ
     nitride                                нитрид (соединение металла с азотом)
     cage                                   коробка
     v. seat                                седло клапана

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