Main engine TROUBLE SHOOTING

REDUCED COMPRESSION PRESSURE

• Defective or worn out piston rings
• Worn or oval cylinder liner
• Incorrect exhaust valve timing.
• Burnt piston crown
• Damaged or burnt exhaust valve.
• Insufficient scavenging

LOSS OF POWER

• Fuel rack setting incorrect.
• Faulty injector.
• Loss of compression
• Fouling of hull 
• Change in VIT rack setting
• Insufficient air.
• Faulty fuel pumps
• Governor malfunctioning
• Change in fuel timings

OVERSPEED

• Fuel rack stuck
• Fault in governor
• Racing of propeller

ENGINE FAILS TO TURN ON AIR

• Pressure in air bottle too low
• Isolating valve on air distributor closed
• Low control air pressure
• Turning gear interlock
• Bursting diaphragm of air starting line damage
• Valve for operating auto start valve not opening.
• Valve for operating air to distributor not operating.
• Isolating valve in air bottle closed
• Control valve for air distributor stucking.
• Main starting air valve jammed.
• Reversing not taken place.

ENGINE TURNS ON AIR BUT DOES NOT FIRE

• Shut down piston of fuel pumps.
• Valve supplying air to puncture valve not cut off.
• Boost air not supplied to governor.
• Governor air booster does not supply adequate oil pressure.
• Pre set control air signal to governor too low
• Fuel pump index too low.
• Fuel filter blocked.
• Auxiliary blower not functioning
• Service tank valve shut.
• Faulty piston ring , liner wear down may lead to insufficient compression pressure.