WHAT ARE THE THINGS TO INSPECT DURING SCAVENGE SPACE INSPECTION , ACTION TO BE TAKEN IN CASE OF SCAVENGE FIRE, INSPECTION AFTER SCAVENGE FIRE

SCAVENGE SPACE INSPECTION

• CHECK THE MAIN BLOWER INLET FLAP VALVES. THESE SHOULD BE FREE TO OPEN AND SHOULD CLOSE WHEN RELEASED.
• TURN THE ENGINE SO THAT PISTON IS VIEWABLE FROM THE  SCAVENGE PORTS.
• INSPECT THE PISTON SKIRT FOR THE SIGN OF SCUFFING OR ABRASION.
• INSPECT THE RINGS FOR DAMAGE AND RING GROOVES FOR EVIDENCE OF CARBON BUILD UP.
• PUSH THE PISTON RING WITH BRASS ROD TO CHECK THE ELASTICITY OF PISTON RING.IF IT FEEL HARD TO MOVE EITHER IT IS STUCK OR BROKE.
• TURN THE PISTON DOWN TO INSPECT THE PISTON CROWN FOR SIGNS OF DEPOSIT AND BURNING ALSO CHECK SIGN OF POOR INJECTION OR CRACKING.
• IF YOU NOTICE OIL DROPLET ON PISTON CROWN IT SIMPLY GIVES INDICATION THAT INJECTOR IS DRIPPING WHICH MAY LEAD TO CROWN FAILURE.
• USING MIRROR LOOK UP THE LINER FOR EVIDENCE OF CORROSION SCUFFING AND ABRASION CORROSION .
• CHECK ALL SCAVENGE DRAIN ARE CLEAR OR NOT 
• CHECK IF THE SLUDGE GENERATED HAVE PRESENCE OF VERY FINE METAL PARTICLES.
• CHECK CONDITION OF LOCKING WIRE BELOW PISTON RING BELOW PISTON WHICH HOLD SKIRT AND CROWN TOGETHER.
• CHECK RELIEF VALVE AT THE MANIFOLD OF THE SCAVENGE SPACE ENTRANCE, NORMALLY PRESSURE SETTING IS ABOUT 10 PERCENT OF NORMAL SCAVENGE PRESSURE.
• IF BLACK SPOT ARE TO BE FOUND ON PISTON RING THIS COULD INDICATE BLOW PAST FROM PARTICULAR UNIT.
• IF OIL IS TO BE FOUND DRIPPING FROM UNDERSIDE OF PISTON RING THIS MEANS THAT O-RING INSIDE THE PISTON COOLING SPACE IS LEAKING.

ACTION TO BE TAKEN IN CASE OF SCAVENGE FIRE.

ACTION TAKEN IN CASE OF SCAVENGE FIRE DEPENDS UPON TYPE OF FIRE , WETHER THE FIRE IS SMALL OR LARGE IN CASE OF LARGE FIRE SIGN SUCH AS PEELING AND BLISTERING OF PAINT LARGE REDUCTION IN ENGINE RPM AND SURGING OF TURBOCHARGER WILL BE NOTICED.

FOR SMALL FIRE

• START REDUCING ENGINE RPM TO SLOW OR DEAD SLOW.
• INCREASE THE CYLINDER LUBRICATION OF THE AFFECTED UNIT, SPECIAL CARE MUST BE TAKEN AS THE INCREASED LUBRICATION MUST NOT FEED THE FIRE, IF FIRE INCREASES DO NOT INCREASE LUBRICATION.
• THE FIRE CAN BE DUE TO LEAKY FUEL VALVE , SO LIFT UP THE PUMP OF AFFECTED UNIT.
• KEEP SCAVENGE DRAIN CLOSED.
• KEEP MONITORING SCAVENGE AND EXHAUST TEMPERATURE AND LET THE FIRE STARVE.
• AFTER FIRE IS OUT LOOK FOR THE CAUSE OF FIRE AND RECTIFY IT.
• AFTER RECTIFYING START INCREASING RPM.
• KEEP MONITORING SCAVENGE TEMPERATURE FOR ANY SIGN OF REIGNITION.

FOR LARGE FIRE

• STOP THE ENGINE IMMEDIATELY ENGAGE TURNING GEAR AND KEEP ENGINE ROTATING WITH THE HELP OF TURNING GEAR.
• EXTINGUISH FIRE WITH FIX FIRE FIGHTING SYSTEM FOR SCAVENGE SPACE . THIS MAY BE CO2 SYSTEM OR STEAM CONNECTION FOR SMOTHERING OF FIRE.
• ONCE AFTER CONFIRMING THAT THE FIRE IS EXTINGUISHED THE SCAVENGE SPACE IS ALLOWED TO COOL DOWN AND LATER OPENED FOR INSPECTION AND CLEANING OF SCAVENGE SPACE.

INSPECTION AFTER SCAVENGE FIRE

• INTENSE FIRE MAY CAUSE DISTORTION AND MAY AFFECT PISTON ALIGNMENT.
• CHECK BY TURNING THE ENGINE AND WATCH MOVEMENT OF PISTON IN LINER CHECK FOR ANY OCCURRENCE OF BINDING AT PART OF STOKE AS BINDING INDICATE MISALIGNMENT.
• CHECK SPRING ON SCAVENGE SPACE RELIEF DEVICE, IF THE DEVICE WAS NEAR THE FIRE.
• PISTON ROD PACKING SPRING ALSO SHOULD BE CHECKED WHICH MAY HAVE BECOME WEAKEN DUE TO OVERHEATING.
• CHECK THE LINER AND PISTON RINGS FOR THE SIGN OF DISTORTION OR BURNING MARKS.
• CHECK DIAPHRAGM AND FRAME OF THE AFFECTED PART.
• CHECK GUIDE AND GUIDE SHOES.
• CHECK TENSION OF THE BOLTS.