2.dies engs.pdf

7/24/2019 2.Dies Engs.pdf

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Cylinder

Piston

CylinderHead

Inlet andExhaust

Valve Injector


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Used inmedium/ high

speeddieselengines


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Many components are similar tothe medium speed, 4 strokeengines.

The main components that aredifferent will be shown


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Cylinder Piston Cylinder

Head Exhaust

Valve Injector Inlet

Ports


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Exhaust valve andinjectors in head.

Air enters thecylinder via ports in

the liner (scavengeports) underpressure.

The crankcase is

sealed from thecombustion space.

Piston rods andconnecting rods.


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of a large slowspeed dieselengine


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Inlet(scavenge)port atbottom


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The bearing between thepiston rod and con rod


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Increases poweroutput

Improves

efficiency Improves

scavenging Used on 2 and 4

stroke engines


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2 strokeengine


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Fresh water cooling

Seawater cooling

Lubricating oil Fuel oil

Air start


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Centrifugal pumpscirculate fresh

water through theengine and assoc.system.

Heater

Cooler


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Also cools othersystems -hydraulic oil, aircompressors,

refrigerationplants

Engine coolingonly shown.

SW circ pump

Strainer


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Separatedrain tank

Strainers

Pumps

Cooler Filters

Purifier

Cylinderlubrication

Oil cooling


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Scavenge Fires

Crankcase Explosions

Air Start line explosions


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Occur in Slow Speed Engines. Deposits from:

After burning Ring blow-by

Injector faults Dirty scavenge space

Indicated by high scavenge temperatures,surging turbocharger, power loss, exhaust

smoke and sparks, hot trunking, an usualsmell and paint peeling on engine.


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Formation of a hotspot: Overheated bearing

Defective piston rod gland.

Timing chain.

Worn piston rings. Adjacent scavenge fire.

Fuel oil dilution

Small initial explosion, larger

second if no crankcase relief doorsfitted.

Engine will need to be shutdown


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Occurs when oil in the air start line isignited by a heat source.

Needs a heat source:

Needs fuel:


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Bursting discs, and or relief valvefitted between the distributor andthe start air valve.

Fusible plug. Flame trap in delivery line.

Turning gear interlock.

Drain valves fitted.

2.dies engs.pdf

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