ENGINEERING LESSON GUIDE 8

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INTRODUCTION TO NAVAL ENGINEERING
DIESEL ENGINES
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USES OF THE DIESEL

• Shipboard emergency electrical power
• Ships boats
• Amphibious landing craft
• Main Propulsion (LST, MCM, MSO, LSD-41 class, Sea
  Shadow)

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DIESEL ENGINE STRUCTURE
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STATIONARY PARTS

• Engine Frame
• Cylinder Block
• Crankcase
• Oil Sump
• Cylinder Assembly
• Liner Heads

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MOVING PARTS

• Piston
• Piston Rings
• Piston Pin
• Connecting Rod

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• Crankshaft and main bearings
• Flywheel

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• Camshaft and Cams
• Lifters, pushrods, and rocker arms
• Intake and exhaust valves
• Injectors
• Accessory Drive Mech.

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THE FOUR STROKE ENGINE
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THE TWO STROKE DIESEL ENGINE
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4 STROKE vs. 2 STROKE

• One power stroke vs. two in the same time period
• 2 Stroke needs a blower
• 2 Stroke combustion process not as complete
• 2 Stroke will usually use a supercharger

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DIESEL ENGINE SUBSYSTEMS
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• Fuel Oil System
• Deliver fuel (must inject the same amount of fuel
  each time, at the same rate, at the proper time,
  and at a sufficient pressure.
• Lube Oil System
• Must provide adequate lube oil so that friction
  and wear can be reduced to a minimum.
• Air Systems
• blowers
• Ignition Systems

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• Engine Cooling System
• Large amount of heat generated
• 3 purposes
• Prevent overheating and the resulting breakdown
  of the LO film that separates the rubbing engine
  surfaces
• Prevent overheating and the resulting loss of the
  strength of the metal
• Prevent excessive stresses in or between the
  engine parts resulting from unequal temperature
• Two types
• Open
• Closed

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• Propulsion Drive Mechanism
• Indirect drive
• Reduction gear
• Reverse gear
• Clutch/Coupling
• Direct drive

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QUESTIONS?
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Reading

• Introduction to Naval Engineering
• Chapter 12, pp. 225-244
• Principles of Naval Engineering
• Chapter 16, pp. 16-1 - 16-35

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QUESTIONS ????