Universidad Nacional Experimental Marítima del CaribeVicerrectorado AcadémicoCoordinación de Idiomas

Maritime EngineeringMarine facilities

Prof: Lisbeth Belisario

Marine Diesel Engine

Diesel Engine

o A ship’s reciprocating machine (the internal combustion engine)

o No diesel engine is a single cylinder engine, there may be as many as twelve driving one crankshaft, but each cylinder is sufficient in operation

Main parts of the diesel engine

Cylinder cover

Piston

Cylinder liner

Crosshead

Connecting rod

Crankshaft

Assembly of large parts

Cylinder cover

The cylinder cover is made of steel and has a central bore for the exhaust valve, which is attached by means of four studs. The cover furthermore has bores for the fuel valves, which are mounted with tubular spacers and nuts. Other bores have been provided for starting valve, starting air inlet, safety valve and indicator cock.

PISTON

The piston consists of two main parts:

Piston Crown Piston Skirt

The piston crown is tightened to the upper end of the piston rod by means of screws. The screws are locked with locking wire. The piston skirt is tightened to the piston crown by means of flanged screws. The screws are locked with locking wire.

The cylinder liner is tightened against the top of the cylinder frame by the cylinder cover, so that it can expand freely downwards when heated during the running of the engine.

Cylinder liner

Crosshead with connecting rod

The crosshead is provided with two guide shoes fitted floating on the crosshead ends. The centre part of the crosshead is housed in the crosshead bearing.

The connecting rod connects the piston to the crankshaft and is responsible for transferring power from the piston to the crankshaft and sending it to the transmission.

The crankshaft is semi-built, i.e. the parts are either shrunk or welded together.

The main bearings are lubricated via a main lubricating oil pipe that branches off to the individual bearings, whereas oil for lubricating the crankpin bearings is supplied from the crossheads through bores in the connecting rods.

Crankshaft

The bedplate is made in one section, consisting of two welded, longitudinal girders and a number of cross girders which support the main bearings. The main bearings, which are of the thin-shell type, consist of steel shells, lined with tin-aluminium and coated with a tin-flash layer.

Assembly of large parts

MAIN ENGINE

"...If the wheelhouse is the brain of the ship, the engine room may be called the heart of the ship".

W. Somerset Maugham "Mister Know-All"

Thank you very much!