DEVIATION IN DIAGRAM DUE TO FAULTS IN INDICATOR :-
VIBRATION IN CORD OR DRIVE
INDICATOR CORD TOO LONG
INDICATOR CORD TOO SHORT
INDICATOR PISTON WORKS SLUGGISH IN CYLINDER AND MOVES BY JERK
SPRING TOO WEAK
VALVE LEAKY
DEVIATION IN CARD DUE TO FAULT IN ENGINE :-
MAXIMUM PRESSURE TOO LOW, BUT COMPRESSION PRESSURE CORRECT. CHECK THE FUEL VALVE FUNCTION AND SPRAY DIRECTION. IF THEY ARE FOUND OK THEN THE FUEL OIL IS INJECTED TOO LATE AND THE FUEL PUMP LEAD SHOULD BE INCREASED.
MAXIMUM PRESSURE TOO HIGH, BUT COMPRESSION PRESSURE NORMAL. TOO EARLY IGNITION. THE FUEL PUMP LEAD SHOULD BE REDUCED.
COMPRESSION AND MAXIMUM PRESSURE BOTH TOO LOW. LEAKY PISTON RINGS, EXHAUST VALVE LEAKY, INCREASED VOLUME OF COMBUSTION SPACE, SCAVENGE AIR SUPPLY TOO LOW.
