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low exhaust back pressure air in the fuel system gasket blow –by or leakage incorrect assembly of idler springs
temperature viscosity lever level
cylinder head cracks piping joints pump leaking all of the above
cooling water vapor from the boiler starting air hot gases
gravity and feed oil cups grease cups hand during installation leakage through the stuffing box
oil rings only compression and scraper rings cylinder liner sealings cylinder liner ring grooves
slack enough to allow slight leakage of fluid slightly clocked brought up tight so as not to allow any leakage fitted with a relief valve
broken down stuck oil leakage carbonized
water leakage steam leakage oil leakage air leakage
escapes overheats expands accelerates
closed, and no leakage permitted across the shaft packing closed, and only slight leakage permitted across the shaft packing open, and no leakage permitted across the shaft packing open, and only slight leakage permitted across the shaft packing
unusual vibration excessive worn parts abnormal pressure any of the above
excessive internal leakage in the pump low discharge pressure and fluid flow excessive fluid level in the hydraulic reservoir operation of the pump at 100% efficiency
erosion and cratering of the nozzle orifices fuel leakage into the nozzle drain line fuel leakage before and after injection insufficient fuel delivery though that nozzle
oil leakage in engine-room hot work （welding, cutting, etc.） static electricity All of the above
too low lead water in fuel too tight spring leakage
a high exhaust temperature a high smoky exhaust a high output a high compression
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