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Common-rail injection Air injection Jerk pump injection Distribution injection
no fuel will be delivered through the nozzle the nozzle will overheat and crack time of injection will change fuel will leak into the drain line
a leaking fuel injection nozzle a clogged air filter early fuel injection burned valves
quantity of fuel injected is decreased quantity of fuel injected will always be increased start of injection is advanced duration of injection will always be greater
exhaust valves mechanical lubricators cooling water pumps fuel injection pumps
low sulfur content in the fuel a loose injector inlet connection late fuel injection high injection pressure
The process begins after TDC The process ends before TDC When the piston is near to the TDC the fuel injection ends None of the above is true
deliver proper fuel quantity to the injection nozzle provide rapid fuel injection cutoff control fuel quantity entering the pump body control fuel pressure delivered to the combustion chamber
Quantity of fuel injected tends to be decreased Quantity of fuel injected will always be increased Start of injection tends to be advanced Duration of injection will always greater
Fuel injection timing will change Nozzle operation will be unaffected Fuel will leak into the drain line Fuel will not be delivered
control fuel injection time more precisely control fuel injection rate more precisely meet the environmental requirements meet high engine speed requirements
assist in a quick cutoff of fuel injection allow oil backflow from the injector to the helix reduce fuel oil pressure between injection strokes meter the quantity of fuel delivered
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
excessively late fuel injection oil in the air charge water in the fuel injection continuing after the fuel charge is ignited
corrosion and grooving of exhaust valves corrosion and gumming of the fuel injection pump salt deposits in the exhaust manifold slag deposits in the fuel injection equipment
late fuel injection early fuel injection high exhaust temperature from that cylinder decreased effective stroke from that injector
fuel treatment fuel combustion fuel injection fuel separating
delivering the same quantity of fuel to each cylinder for each power stroke accordingto engine load maintaining the metering adjustment for a reasonable period under all load conditions timing fuel injection to obtain maximum power and good fuel economy distributing the fuel to all parts of the combustion chamber for proper combustion
The amount of fuel injected will be increased The start of injection will be retarded The nozzle will permit fuel to dribble The spray pattern will be distorted
excessive fuel pressure high lube oil viscosity inadequate fuel injection excessive starting air pressure
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