Camshaft And Fuel Cam

Question 1

What is the purpose of a camshaft?

Answer 1

To drive the fuel pumps, cylinder lubricators and maintain engine timing.

Question 2

What are two methods of driving a camshaft on a large marine diesel engine?

Answer 2

Gearing or Cam Chains.

Question 3

What is the speed of the camshaft relative to the crankshaft on a four-stroke engine?

Answer 3

0.5 Speed of the Crankshaft.

Question 4

What is the speed of the camshaft relative to the crankshaft on a two-stroke engine?

Answer 4

The same speed as the crankshaft.

Question 5

What are two items of ancillary equipment that can be driven via the timing chain?

Answer 5

Main engine speed governor drive & Air Starting Distributor.

Question 6

What equipment is used to give warning of conditions that could lead to an explosion in the crankcase?

Answer 6

Oil mist detector?

Question 7

What does a fuel cam for a unidirectional diesel engine indicate?

Answer 7

It indicates the Point of Injection, Peak, and Slow return.

Question 8

What is the characteristic of the cam for fuel injection in a unidirectional medium speed engine?

Answer 8

The cam has fast lift for injection and a downturn to avoid shock loading.