The cylinder block and the crankcase are of a separate type and are tightened firmly with the bedplate by means of the tension rods with high rigidity.
Sufficient strength is provided within these components by inceased wall thickness and appropriate arrangement of ribs coping with increased Pmax.
The intake manifold made of cast iron is fitted compactly on starboard side (exhaust manifold side) of the engine.
2) Crankshaft and bearings
R-R forged steel (flowing grain forging method) excelling in strength is used for crankshaft to provide sufficient strength against high combustion pressure. White metal is used for main bearing metal and aluminum alloy metal is used for crankpin bearing. Both metals are of thin shell type providing high load durability.
3) Piston
The piston is of assembling type composing of the piston crown made of forged steel and the piston skirt made of cast iron. The assembling type piston has so designed that is provided with sufficient strength and durability to sustain mechanical and thermal stresses due to high combustion pressure.
Four each compression rings are fitted on each piston. The top ring is of gas tight (GT) type to avoid combustion gas from leaking.
A couple of oil scraper rings of high pressure type with coil expander are arranged above the piston pin hole to avoid oil up into the combustion chamber and to lubricate properly the sliding face of the cylinder liner preventing cylinder liner wear and piston burn.
4) Connecting rod
The conneting rod is forged of carbon steel and its big end forms crankpin bearing. The crankpin bearing is of three-piece type which allows big diameter of crankpin and minimum piston overhauling height providing sufficient stiffness against combustion pressure and inertia force.
5) Cylinder liner
The cylinder liner is made of special cast iron and its wall is made thicker for increased combustion pressure. The cylinder bore is cooled to keep temperature at top ring position appropriate.
The cylinder liner is also supported at its half way to prevent cavitation errosion at its cooling jacket side caused by fine vibration.
