Camshaft & Fuel Cam

Question 1

2. With reference to marine diesel engines; a) State the purpose of a camshaft.

Answer 1

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

Question 2

2. With reference to marine diesel engines

b) State 2 methods of driving a camshaft on a large marine diesel engine.

Answer 2

The 2 methods are gearing or cam chains.

Question 3

c) State the speed of the camshaft relative to the crankshaft on:

i) a 4 stroke engine
ii) a 2 stroke engine

Answer 3

c) i) ½ the speed of the crankshaft

c) ii) the same speed as the crankshaft