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If the detergent type lubricating oil being used in a diesel engine is black, the oil （）
A . must be centrifuged
B . must by filtered
C . must be changed
D . is holding finely dispersed carbon in suspensio
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A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）
A、the use of a poor quality oil
B、the deterioration of its properties
C、the formation of deposits
D、the reduction in heat transfer ability
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Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.
A . overspeed trip
B . audible/visual alarm
C . the ships/boats general alarm
D . reserve oil storage tank
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A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）
A . a high viscosity index
B . a low viscosity index
C . neutralize acids
D . resist oxidation at high temperature
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The burning of fuel oil in a diesel engine having a high sodium content, will cause （）
A . corrosion and grooving of exhaust valves
B . corrosion and gumming of the fuel injection pump
C . salt deposits in the exhaust manifold
D . slag deposits in the fuel injection equipment
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Dirt in the fuel oil system of a diesel engine can cause （）.
A . clogged filters
B . poor combustion
C . overloading of the diesel
D . shock of fuel line
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Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A . low oil pressure
B . high coolant pressure
C . leaking fuel injector
D . cracked cylinder head or liner
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Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）
A . grinding the spare plunger to the barrel
B . replacing the plunger and the barrel
C . highly polishing both the plunger and barrel
D . replacing plunger only
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Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A . open the bypass line
B . cut in the lube oil cooler
C . pressurize the lube oil system
D . top off the expansion tank
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A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.
A . the engine was over filled
B . there might be a fuel leak
C . there might be a water leak
D . all of the above
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Leaking oil seals on a diesel engine turbocharger can cause（）
A . the engine to run after the fuel has been secured
B . the engine to over-speed
C . a fire
D . all of the above
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Diesel engine lube oil can become contaminated as a result（）
A . the water produced during combustion
B . the sulfur in the fuel
C . unburned fuel oil
D . all of the above
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High lube oil temperatures developing in a diesel engine can result from（）
A . high oil pressure
B . excessive bearing end play
C . plugged oil control rings
D . engine overload
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With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.
A . allow filtration of less viscous oil
B . decrease the pressure drop across the filter
C . improve overall filtration
D . all of the above
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Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.
A . acidity of the oil
B . pour point of the oil
C . flash point of the oil
D . viscosity of the oil
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Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）
A . electronic ignition system
B . compression of air by the piston
C . friction in the fuel injector
D . fuel oil bearing system
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Lubricating oil should be changed on a heavy duty diesel engine when（）.
A . it gets dark in color
B . a sample rubbed between fingers feels thin
C . it has been in use for a specified interval
D . it no longer supports combustio
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Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.
A . internal crankshaft passages
B . immersion in oil
C . splash lubrication
D . injection lubricatio
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The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）
A . clogged fuel injection pumps
B . increased cylinder liner wear
C . intake valve stem corrosion
D . varnish deposit on pisto
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Diesel oil may be used to cool （） of a diesel engine.
A . cylinders
B . exhaust valves
C . pistons
D . fuel valve
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In a diesel engine lube oil system, which of the following parts should be lubricated first?（）
A . Camshaft beatings
B . Main bearings
C . Piston crowns
D . Cylinder wall
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A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）
A . loss of additives from the lube oil
B . carbon deposits in the lube oil
C . excessive centrifuging
D . excessive fuel dilutio
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When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
A . filter to remove the fuel oil
B . use the settler to remove the fuel oil
C . remove the fuel oil by centrifuging
D . drain and then renew the lube oil supply
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The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）
A . determine the need for filter cleaning
B . measure any change in oil viscosity
C . prevent damage to the filter
D . determine the need for batch filtratio
