Integral water jacket liners use O-rings near the bottom of the liner. These O-rings serve to ______________./prevent the escape of lubricating oil from the crankcase Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits, may cause _____________./increased piston wear The most severe cavitation erosion occurring on the waterside of diesel engine wet cylinder liners normally occurs ____________./near the middle of the thrust side of the liner A crack in a cylinder liner can be caused by _____________./restricted cooling water passages In a diesel engine, a cylinder liner should be replaced ifit is ______________.I. scuffedII. scored/II only is correct In a diesel engine, an integral liner is one in which thecooling water __________. I. flows through the cylinder liner jackets II. touches the outer side of the liner/I only The cylinder liner forming the cylinder wall and the inside of the water jacket is called a _____________./wet liner The purpose of counterboring the top of the cylinder liner, extending down to the top point of travel of the top compression ring, is to _____________./prevent wear of the liner from forming a ridge at the upper level of ring travel Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?/Pores in the plating aid in maintaining the lube oil film. A properly honed diesel engine cylinder liner will ________./shorten the ring break-in period The lower water seal on a diesel engine wet cylinder liner must allow for liner axial movement. This seal is most commonly a _____________./neoprene O-ring Which of the diesel engine cylinder liners listed has internal cooling water passages?/Integral water-jacket liner. The lower water seal on a diesel engine wet cylinder liner must allow for liner expansion and contraction. This seal is most commonly a _____________./neoprene O-ring It is easier to replace a dry cylinder liner than a wet one because ____________./water seals are not required One advantage of dry cylinder liners used in a diesel engine is the _____________./procedure to replace dry liners is simpler than for wet liners One of the advantages in the use of a dry liner over a wet liner is _____________./there is less likelihood of water leaking into the combustion space In certain cases, a cylinder liner can be refinished rather than replaced. When properly honed, the _____________./liner surface should have a crosshatch pattern A properly honed diesel engine cylinder liner will ________./shorten the ring break-in period Which of the following statements concerning cylinder liner wear in a single acting diesel engine is correct?/Excessive liner wear causes wear between piston rings and grooves. Generally, where should you expect to find the greatest amount of wear on a cylinder liner?/Opposite the top ring shortly after piston travel has ended the compression stroke. The rate of wear on a cylinder liner depends on the _____________./all of the above A scored diesel engine cylinder liner will cause __________./rapid wearing of piston rings Which of the following statements concerning cylinder liner wear is true?/Excessive liner wear causes wear between piston ring and groove. Scuffed cylinder liner surfaces in a diesel engine can result from ______________./operating an overheated engine Which of the following operations will have a direct impact on the rate of wear in a cylinder liner ____________./quality of fuel injected Scuffed cylinder liner wearing surfaces in a diesel engine can result from _____________./applying load to a cold diesel engine Scuffed cylinder liner wearing surfaces in a diesel engine can result from _____________./operating the engine overheated What is to be installed on an internal combustion engine if its cylinder bore exceeds eight inches?/Explosion relief valves An inline engine having a nine inch bore and more than eight cylinders will _________./have three explosion relief valves Cylinders diameters greater than 230 mm require additional safety devices when the scavenging spaces are openly connected to the cylinders. Which of the following devices will be used to protect such spaces?/Explosion relief valves What is required for crosshead type engines that have a scavenging space in open connection to the cylinder?/The scavenging space is to be permanently connected to an approved fire extinguishing system, entirely separate from the fire extinguishing system of the engine room. Engine displacement is equal to the cylinder _____________./area times the stroke, times the number of cylinders Successful combustion inside the cylinders of a diesel engine is dependent upon _____________./all of the above Turbulence in a diesel engine cylinder is of major importance in providing _____________./complete fuel/air mixing In a full floating wristpin, the pin is prevented from sliding against the cylinder walls by _____________./snap rings Individual cylinder performance in a diesel engine is routinely determined by exhaust gas _____________./pyrometer readings Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by _____________./a badly worn piston pin Combustion knock can occur in the cylinders of a diesel engine under any condition permitting _____________./excess fuel in the combustion chamber Excessive diesel engine cylinder exhaust back pressure will be caused by _____________./an obstruction in the exhaust silencer Which of the listed designs is effectively used to provide the turbulence necessary for proper combustion in a diesel engine cylinder?/Precombustion chamber The highest pressure in a diesel engine cylinder normally occurs _____________./after TDC Turbulence is created in the cylinders of a diesel engine to _____________./help mix fuel and air A diesel engine indicator diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the indicator spring is 1 mm = 1 kg/cm2, what is the cylinder mean effective pressure?/17.6 kg/cm2 Forcing the exhaust gases from the cylinder of an operating diesel engine with the aid of a blower is known as ________./scavenging The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called _________./supercharging A diesel engine indicator diagram measures 12.5 cm in length and has an area of 22 cm2. What is the cylinder mean effective pressure if the spring used has a scale of 1.25 mm equals 1 kg/cm2?/22.0 kg/cm2 Using a diesel engine indicator P-V diagram, the cylinder mean effective pressure is calculated to be 21.3 kg/cm2. What is the scale of the spring used on the indicator if the diagram area is 18.46 cm2 with a length of 13 cm?/1.5 The bore of a diesel engine cylinder describes the ________./inside diameter of the cylinder By comparing the exhaust gas output of each cylinder of a diesel engine, one method of determining if the engine load is balanced is by the use of a ______________./pyrometer By comparing the exhaust gas output of each cylinder of a diesel engine, one method of determining if the engine load is balanced is by the use of a ______________./pyrometer Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior to starting?/To ensure foreign material (water etc.) is not present in the cylinders. Cylinder linings constructed as an integral part of the block, are characterized by which of the following disadvantages?/They cannot be replaced. Wear is usually greatest at the top of the cylinder bore of a diesel engine due to the ____________./highest pressures being exerted For a diesel engine, individual cylinder performance is commonly determined by exhaust gas _____________./pyrometer readings Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?/Fuel Water accumulation in the cylinder of a secured engine is an indication that the _____________./cylinder liner may be cracked Which of the listed conditions will affect the mean effective pressure the most in the cylinders of a diesel engine?/Completeness in the mixing of the fuel and air The greatest turbulence in a diesel engine cylinder is created by the _____________./shape of the combustion chamber | |
