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Question 1

What are the two functions of the crankshaft?

Answer 1

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

Question 2

The 5 main parts of the crankshaft are:

Answer 2

• Nose
• Fillet
• Crank Web
• Counterweights
• Crank Flange

Question 3

The purpose of the internal drilling in a crankshaft is:

Answer 3

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

Question 4

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

Answer 4

A one piece, forged, steel alloy

Question 5

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

Answer 5

The journals

Question 6

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

Answer 6

• 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)

Question 7

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

Answer 7

X = 360° / 16
X = 22.5°

Question 8

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

Answer 8

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

Question 9

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

Answer 9

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.