Regarding a Diesel engine
crankcase, the gener alarrangement and installation should preclude the
possibility of ________./free entry of air to the crankcase
A diesel engine crankcase
ventilation system ______________./removes combustible gases
Internal combustion
engine crankcase vent outlets must be equipped with ______./corrosion resistant
flame screens
What function is provided
by the crankcase ventilation system on
some diesel engines?/Prevents the accumulation of combustible gases.
The crankcases of many
diesel engines are kept under a slight vacuum to _____________./reduce the risk
of explosion
The crankcase of many
diesel engines are kept under a slight vacuum by the ______________./crankcase
exhaust fan
When may the crankcase
ventilation pipes or oil drain pipes of two or more engines be connected?/No
interconnection may be made between the crankcase ventilation pipes or oil drain pipes.
Crankcase explosion
relief valves should be of the ________./return seating type
Explosion relief valves
on diesel engine crankcases should relieve the pressure at not more than
_________./0.2 bar
How many crankcase relief
valves are required for a 13 inch bore,
eight cylinder in-line engine?/8
With regards to a diesel
engine crankcase explosion, the most violent is the _____________. I. primary explosion II. secondary explosion/II only
Which of the listed
problems would be indicated by an
accumulation of water in one cylinder, in addition to the crankcase of
an idle diesel engine?/Cracked cylinder liner.
The direct cause of a
crankcase explosion can be attributed to ______________./an overheated bearing
The possibility of a
diesel engine crankcase explosion will be increased by operating an engine
____________./with a leaking crankcase inspection cover gasket
Which of the following
problems could develop due to the accumulation of oil vapors in the crankcase
of a diesel engine?/Crankcase explosion
When oil vapor, oxygen
and hot spots are present at the same time within a crankcase, which of the
following hazards could develop?/Explosion
Which of the listed
conditions is most likely to cause a crankcase explosion?/Fuel dilution of the
lube oil
Crankcase explosions in
propulsion diesel engines result from _____________./the ignition of unburned
fuel and air in the crankcase
The blower type crankcase
ventilation system ____________./removes combustible gases from the crankcase
Provision is to be made
for ventilation of an enclosed diesel
engine crankcase by means of a small ________./breather or by means of a slight
suction not exceeding 1" of water
Under normal conditions,
the main source of crankcase oil contamination is attributed to
______________./breakdown of the lubricating oil
Which of the following
conditions is most likely to occur when unburned fuel contaminates the
crankcase of a diesel engine?/Lube oil is diluted and its viscosity is reduced.
When fuel enters the
crankcase of a diesel engine, it
_____________./dilutes the lube oil and reduces its viscosity
If a crankcase explosion
occurs in a diesel engine, which of the listed actions should be taken?/Allow
the engine to cool before opening the crankcase.
If a crankcase explosion
occurs in a diesel engine, you should
stop the engine and _____________./allow the engine to cool naturally
If a crankcase explosion
has occurred in a diesel engine, and the crankcase remains intact, which of the
following precautions should be observed?/The crankcase should remain unopened
until the engine has cooled.
If water is found in the
crankcase of a diesel engine, the cause may be due to _____________./all of the
above
How does water enter the
crankcase of a diesel engine?/As water vapor contained in blow-by.
Water accumulating in the
crankcase of a diesel engine could indicate _____________./a cracked cylinder
liner
Diesel engine
"blow-by" into the crankcase is caused by excessive ring
____________./gap clearance
In a diesel engine,
blow-by is a result of combustion gases leaking into the crankcase past the
_____________./compression rings
An increase in crankcase
pressure generally indicates
_____________./worn engine cylinder liners
A substantial increase in
crankcase pressure could be an indication of _____________./a worn cylinder
liner
An increase in diesel
engine crankcase pressure generally indicates excessive _____________./piston
ring blow-by
A substantial increase in
crankcase pressure could be an indication of a/an _____________./worn cylinder
liner
If you notice smoke
coming from the crankcase exhaust fan outlet of an operating diesel engine, you
would suspect ___________./broken piston rings |
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