Maintenance Procedures. Test 5 – Online Maritime Tests

If you are going to enter the engines crankcase (go inside), how will you secure the engine after you have closed the main starting air valve ?

Keep a man posted in the control room to watch that nobody tries to start the engine.
Close absolutely all valves on the starting air bottle.
Engage the turning gear on the engine.
Close the instrument air supply.

What will the effect be, if you have a fuel injector valve that is dripping after the injection is finished ?

Less carbonizing.
Damage to piston and liner.
Better combustion.
Greater output of the engine.

During inspection of piston and liners through scavenging ports, piston rings on all units were found as shown (micro seizure). The best way to stop its progress is:

Replace all piston rings
Increase cylinder oil consumption
Run engine at lower load.
Increase cylinder oil consumption, determine fuel quality and readjust the fuel oil purifiers

Some engine manufacturers recommend that washing of the compressor side is not carried out. Is this due to;

Greasy sludge from the compressor sticking between the fins in the air coolers, necessitating extra cleaning of these.
The thermal shock exhibited by the vanes.
The nozzle ring becoming corroded.
Large volumes of water being carried over into the cylinders of the engine.

To achieve best possible combustion in our engine, we want to have:

a beam of solid fuel hitting the top of the cylinder liner.
let some of the fuel go to the overflow pipe.
a beam of solid fuel, hitting a warm piston top.
an atomization of the fuel injected into the combustion chamber.

Why is the tightening of the timing chain important?

To reduce vibration in the chain.
To reduce the noise level
To avoid high wear down of chain and chain wheel tooth and a potential breakdown.
To get the right timing on the engine.

Review Answers