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Flashcards in 190201f Deck (9)
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1
Q

What are the two functions of the crankshaft?

A
  • Converts the reciprocating motion of the piston and connecting rods to rotary motion
  • Drives the camshaft and engine accessories
2
Q

The 5 main parts of the crankshaft are:

A
  • Nose
  • Fillet
  • Crank Web
  • Counterweights
  • Crank Flange
3
Q

The purpose of the internal drilling in a crankshaft is:

A

To provide a path for oil to travel from the main journals to the rod journals

4
Q

Camshafts used in medium/high speed diesel engines are usually made using:

A

A one piece, forged, steel alloy

5
Q

Crankshafts used in diesel engines are usually hardened to improve the wear characteristics of what part?

A

The journals

6
Q

Name four factors that determine the arrangement of the crankshaft throws:

A
  • The number and arrangement of cylinders in the block
  • The cylinder firing order
  • Engine balancing
  • Main bearing loads (preventing adjacent cylinders from firing in sequence)
7
Q

Calculate the number of degrees between firing impulses on a two-stroke, sixteen cylinder, engine:

A
X = 360° / 16
X = 22.5°
8
Q

What would the mating cylinders be in a four-stroke engine, with six cylinders, with a firing order of: 1-5-4-8-6-3-7-2

A

1&6; 5&3; 4&7; 8&2

9
Q

TRUE or FALSE: An unbalanced engine would have reduced mechanical efficiency.

A

TRUE - An unbalanced engine would run rough with excessive vibration/stress on the components and have reduced mechanical efficiency resulting in a loss of power.