1. Exhaust temp of one unit is high; what could
be the reason?
Leaky injector, leaky exhaust valve, scavenge fire, incorrect fuel injection timing,
incorrect fuel pump setting,scavenge ports choked, temp indicator faulty.
2. How is Lube Oil For X head lubrication
delivered in (B/W & SULZER Engines)
Separate pipe from Main Engine sump in
B&W and separate cross head pump for Sulzer engines.
3. How many tie rods will be there?
Function of tie rods? Function of tie rods is to hold the cylinder block,
engine frame and bed plate under compression. 2N+2
4. What is the role of the Thrust block?
The role of thrust block is to transmit the axial thrust from the propeller to
the hull to avoid misalignment of crankshaft.
5. Where is the thrust bearing in MC series or
R T A engines’?
In MC series engines thrust block is placed after the flywheel.
7. Why is the thrust bearing close to the engine
and not close to the stern tube?
Area near stern tube small and not adequately stiffened.
8. What is the role of the stuffing box?
Isolate crankcase from combustion chamber, avoid mixing of oils,avoid
combustion products going to Crankcase.
9. What is the difference between stuffing box
drain oil and scavenge space drain oil?
Scavenge space drain oil is cylinder oil. Stuffing box drain oil is Crankcase oil.
10. What are the strokes in 2 stroke and four
stroke engines?
Compression/ expansion stroke. Suction/compression/power/exhaust.
11. Why is fuel timing important?
Efficient combustion, avoid fuel knock, maximum power output, avoid after
burning.
12. Why are 2 springs sometimes used in inlet
and exhaust valves?
Avoid breaking or bending due to Resonance, one right hand and other left hand,
twisting moment neutralized, increase closing force on valve, avoid valve
bounce
13. What is MEP and MIP?
Mean effective pressure, mean indicated pressure.
14. Are there engines W/O cylinder head?
Yes, double acting doxford 2 stroke opposed piston engines.
15. Why is an expansion tank provided in jacket
cooling water system?
Air
removal, replenishing water,expansion of hot liquid, positives suction head for
pump