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 | |
