Diesel engines revision Questions Flashcards
What are the applications for a diesel engine on board
- air compressors
- fire pumps
- diesel generator
- main prpoilsion engines and motors
Explain how cylinders are numbered on an ‘inline’ engine
Cylinders are numbered from ‘free end’ starting with 1,2,3 ect to ‘drive end’
Explain how cylinders are numbered on an ‘vee’ engine
Vee engines, A&B banks can be identified by looking from ‘free end’
What is the purpose of a crankshaft
To turn reciprocating motion into rotary motion
What is the purpose of the flywheel
To promote ‘smooth running ‘ during the non-power strokes by storing kinetic energy
What is the purpose of the camshaft
To control the opening and closing of the correct sequence and is driven off the crankshaft .
At half the crank shaft speed
What is the purpose of the pushrod
To transfer motion from the camshaft to the rocker arms
What are four strokes cylcle
Induction stroke
Compression stroke
Power stroke
Exhaust stroke
What is the purpose of the fuel lift pump
To provide clean, ready to use fuel from the header tank to the diesel engine
What is the purpose of the oil cooler within a lub oil system and what medium does it use to achieve
The purpose of a oil cooler is to use cooling system so its vicosity in the lub oil is kept cool to a sorten temputre
The kittewake oil tester is testing the oil for what in the oil (four tests)
Water in oil
Insolubles
Viscosity
TBN acicity
How often is oil testing performed and where are the results stored
Weekly and in the engine log book
What makes up coolant? And to what ratio
Its a 50/50 mix of water and AL39
What are the 5 engine safty devices used to protect the engine
Low lub oil presure
Low coolant pressure
High lub oil temputer
High coolent temputer
Engine over speed
Who do you inform when any of the engine safty devices alarms trip
You should inform the MEOOW immediatly
what are the hazards when working with/around engines
Fire
Heat
Noise
Rotating machinery
Personal hygenie
what do you do for re-settinga trip/alarm
Investigate the cause of the trip
Rectify the fault
Rest the trip
What is the purpose of the fuel injector within a diesel engine
Fuel injector measured amount of high pressure, atomised fuel into the combustion chamber
What is a diesel engine
A diesel engine is a type of engine that compresses air into the cylinder and the injects furl into the hot compressed air and spontanous combustio occurs
What are the valves doing on a induction stroke on a diesel engine
The inlet valvues opens allowing fresh air into the cyclinder while at the same time the exhaust is closed
What are the piston movments on a
induction stroke
The piston moves from top dead centre (TBC) to bottom dead centre (BDC)
What causes the vaccum in a induction stroke
The increase in volume which causes depression, drawing air into the cylinder
What is the valve movement on a compression stroke
The inlet & exhaust valves are both closed
What is the piston movement in a compression stroke
The piston moves from bottome dead centre (BDC) to top dead centre (TDC)
Which compressing the air . As it becomes trapped in the cylinder the temputure and pressure rises
What does the fuel injector do when the piston is almost at TDC
The fuel injector sprays high pressure atomised fuel
When does the fuel injecter spray its high pressure , atomised fuel
When the piston is almost at top dead centre (TDC )
What happens when the fuel is injected into the high pressurised air on a compression stroke
It creates a ignition delay of the fuel igniting
What are the valves movements on a power stroke
Both valves remain closed
(same as compression stroke)
What is the piston movement on a power stroke and explain what else is happing at the same time on this stroke
The piston is passing TDC and starts to decend towards BDC
While the fuel has been ignited and combustion occurs
What causes the down push of the piston to BDC
It is the burning of air/fuel mix which causes a rapid increase of temputre and pressure and thta is what causes the mownt of the piston
What are the valves movement on a exhaust stroke
The exhaust valve are open
The inlet valve is closed
What is the piston movement on a exhaust stroke and what does the movement do
The piston rises from BDC to TDC
Which in turn pushes the waste gases through the exhaust
