This Operation Manual has been prepared for your safe and effective use οΙ the engine. Read through this Operation Manual and fully understand the saIety precautions and precautions regarding the operation, checking and servicing before using this engine.
Outline of Structure
This engine is designed Ιο be a crankcase integrated, susρension metal structure as shown in the below sectional view. For its installation, there are the lixed suρρorting to fix it directly on the common bed and the antivibration suρρorting to fix the mounting foot and generator on the common bed via rubber vibration insulators.
Structure of Major Parts
- Cylinder block: Provided with side covers οη both the operating side and the non-operating side, the cylinder block is a duplex wall structure made of casting integrating the boost air manifold (boost air chamber), main lubricating οil pipe and main cooling water pipe.
- Cylinder liner: Made of a special cast iron, the cylinder lίner has the special thermal treated surface. The liner face is finished with precision honing. On the upper part of inner diameter of the liner, an anti-polish ring is mounted.
- Cylinder head: The cylinder head is of the 4-valve type equipped with two suction valves and two exhaust valves and arranged with a fuel injection valve at the center. The cylinder head is clamped by tightening four bolts under the hydraulic pressure. The exhaust valve seat is water cooled, and the fuel injection valve is mounted with a sleeve.
- Piston and piston rings: The piston is special cast iron. Its upper parts is cooled by the cocktail shaker method using lubricating οil that passes through the connecting rod and piston pin. The skirt is provided with special coating. The piston rings are Ιννο compression rings, and their sliding surface is chrome-plated. Besides, there is one οίl ring combined with a coil expander whose sliding surface is also chrome-plated.
- Connecting rod: The big end of a connecting rod is an obliquely split structure, and its mating surfaces are serrated. The connecting rod bolts are Ιννο tap bolts tightened Ιο the specified angle.
- Crankshaft and main bearings: Α balance weight is attached Ιο each arm of the crankshaft by tightening the balance weight clamping bolts Ιο the specified angle. The main bearing is of the suspension metal type. ΑΙ the flywheel-side timing gear case of the Νο.1 main bearing, the Νο.Ο main bearing is provided, and ίΙ is attached with thrust metal and journal metal. Each bearing cap is fixed with Ιννο mounting bolts and two side bolts on both the operating side and non operating side. The mounting bolts are tightened Ιο the specified hydraulic pressure.(The side bolt of the Νο.Ο main bearing cap is equipped only on the non-operating side.)
- Camshaft: The suction/exhaust cam and fuel cam form a monoblock structure with the camshaft. ιι is split in two at the bearing part between the Νο.3 & Νο.4 cylinders.
- Fuel injection pump: The fuel injection pump is of the Bosch type. The delivery valve is a pressure equalizing valve, and the plunger barrel is of the Ιορ closed type. The fuel injection timing is adjusted by means of the adjusting bolt of tappet of pump driving gear.
- Fuel injection valve: The type using the high viscosity fuel οil is cooled with the cooling water running through the fuel injection sleeve mounted οπ the cylinder head. Α heat transfer bush (copper) is installed between the fuel injection nozzle and the injection valve sleeve, thus indirectly cooling the injection nozzle. The engine using the ΜΟ οίl does ποΙ use the indirect cooling system nor a heat transfer bush. The injection pressure is adjusted with the spring shoe fastened with the adjusting nut.
- Starting and stopping devices: The engine is started by an air motor using the compressed air. Το stop the engine, the start/stop lever is set in the STOP position. Το stop the engine by the remote operation, the air piston is actuated Ιο set the rack of fuel injection pump at the non-injection position. The startlstop lever and turning device are interlocked with the respective switches Ιο prevent starting by erroneous operation.
Lubricating Οil System
The lubricating οil discharged Irom the pump is regulated of its pressure Ιο the specilied value by the pressure regulating valve. Then, the lub. οil passes through the cooler and strainer and then enters the main gaIIery of the cylinder block. The lubricating oilline is branched at the main gallery. The οil passes through each part and returns Ιο the οίl pan and then the common bed. Each lub. οil passage Iranched 011 Irom the main gallery is a drilled hole structure, excluding lines leading Ιο the pressure regulating valve and governor driving gear. The οil suction part of the pump varies according Ιο the engine installation types. In the case an engine instaIIed by the fixed supporting, the fixed suction part is the command bed; in the case of antivibration supporting, it is oil pan.
Cooling Water Ρipe System
The cooling system of this engine is Ιο cool the engine (cylinder liner and cylinder head) with hot fresh water and the lubricating οίl cooler and boost air cooler with cold fresh water. This cooling system is called the dual fresh water line cooling system of the mixing type.
The cooling water discharged Irom the cold water pump passes through the boost air cooler and lubricating οίl cooler, and then returns Ιο the Iresh water cooler side. However, a part of the cooling water passes through the cooling water passage on the cylinder block and Ilows into the cold water suction side through the automatic thermostatic valve.
The cooling water discharged Irom the hol water pump returns 10 the cylinder jacket, cylinder head and cooling water collecting pipe and then Ιο the automatic thermostatic valve which controls the temperature of thus returned cooling water.
The cooling water flown into the cylinder head cools the combustion surface and periphery of luel injection valve sleeve and then cools the exhaust valve seat. After that, the cooling water floes into the cooling pipe.