What are the two functions of the crankshaft?
- Converts the reciprocating motion of the piston and connecting rods to rotary motion
- Drives the camshaft and engine accessories
The 5 main parts of the crankshaft are:
- Nose
- Fillet
- Crank Web
- Counterweights
- Crank Flange
The purpose of the internal drilling in a crankshaft is:
To provide a path for oil to travel from the main journals to the rod journals
Camshafts used in medium/high speed diesel engines are usually made using:
A one piece, forged, steel alloy
Crankshafts used in diesel engines are usually hardened to improve the wear characteristics of what part?
The journals
Name four factors that determine the arrangement of the crankshaft throws:
- 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)
Calculate the number of degrees between firing impulses on a two-stroke, sixteen cylinder, engine:
X = 360° / 16 X = 22.5°
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
1&6; 5&3; 4&7; 8&2
TRUE or FALSE: An unbalanced engine would have reduced mechanical efficiency.
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.
