Fuel System System and Adjusting Flashcards
A properly tuned engine results in?
Lowest possible exhaust emissions
Most efficient engine operation
Maintains rated power output
Reliable engine operation and maximum service life
A tune up can involve what?
Valve and injector adjustments, governor adjustments, engine brake adjustments, injection pump timing checks, Injection nozzle testing
The interval for a tune-up is affected by operating conditions like?
Type of engine load (continuous, intermittent)
Application (on road, off road, stationary)
Excessive valve clearance causes what?
Delayed valve timing and reduced valve openings
A malfunctioning fuel injector can cause what?
Hard starting, Rough idle, Low power, White smoke, Black smoke, Combustion knock
Most hydraulic fuel injectors can be bench tested for?
External leakage, Nozzle opening pressure, Spray pattern, Nozzle chatter, Needle seat to face leakage, Back leakage
To ensure smooth engine operation, the maximum variation in needle valve opening pressure between injectors must be?
Less then 50 PSI
In order to confirm a proper spray pattern, you must know the?
Number of spray holes
Angle at which the holes discharge from the nozzle
To check for needle seat leakage, fuel pressure must be maintained at?
150-200 PSI lower than opening pressure
A dynamometer does what?
Absorbs and measures the power output of an engine
All dynamometers have what three basic components?
A power absorption unit
A load control
A torque measuring device
What are the 3 types of dynamometers?
Engine flywheel
Rear wheel
Power takeoff
Horsepower is equal to what?
Torque x RPM divided by 5252
How do most engine manufacturers rate the fuel economy?
Brake specific fuel consumption (BSFC)
Naturally aspirated engine have a power loss of what for every ____ feet in elevation gain?
3% for every 1000 feet
