Engine Repair Exam Questions Answered Correctly Latest Version ()

Engine Repair Exam Questions Answered Correctly Latest Version () Cylinder Block - Answers Houses the area whrre combustion happens, Maybe be made from iron or aluminum, this is what the heads and oil pan connect to. What can be identified by a vacuum test ? - Answers Improper valve or ignition timing, Manifold leak, Weak valve spring, Leaking head gasket, Carburetor or Injector adjustment, Burnt or leaking valves, Sticking valves, Restricted catalytic converter, uneven compression, Restricted exhaust system An engine makes a sharp metallic rapping noise at idle that is present wether the engine is hot or cold, Noise disappears at acceleration or higher speeds. - Answers Worn piston pins What is a compression ratio ? - Answers The ratio of air/fuel mixture How long is the stroke of an engine compared to the length of crankshaft throw ? - Answers Twice the size What engine system removes burnt gasses and reduces noise produced by the engine ? - Answers Exhaust In an over square engine the bore is _____ than the stroke - Answers Bigger What does the selective catalytic converter do in newer diesel vehicles ? - Answers Reduce harmful emissions What's the minimum number of valves in a 4 stroke engine ? - Answers 2 How many degrees of crank shaft rotation are require to complete a 4 stroke cycle ? - Answers 720° Causes of low oil pressure are ? - Answers Pump related problems, plugged oil pickup screen, weak or broken oil pressure relief valve, low oil level, contaminated oil, or low oil viscosity Causes of high oil pressure are ? - Answers Too much oil, cold oil, high oil viscosity, Restricted oil passages, or a faulty pressure regulator What can be caused by abnormal oil pressure ? - Answers Loss of performance, excessive engine noise, and poor starting What does a fuel cell electric vehicle rely on to produce electricity? - Answers Hydrogen Are both gasoline and Diesel engines internal combustion ? - Answers Yes Which V-type engine valve train design may use four camshafts ? - Answers DOHC Can poor fuel economy be used by a missing thermostat ? - Answers Yes True or False ? Diesel engines only run on 4 stroke principle ? - Answers False All OHV engine designs use one camshaft in the block ? - Answers No GM cane out with one that uses two What engine type uses principles from both gasoline and Diesel engines ? - Answers Stratified What is a W engine configuration? - Answers Two V-type engines put together at the crankshaft Does the lubrication system help do? - Answers Transfer heat from one pet to another for cooling Does torque always increase with engine RPM ? - Answers No High engine compression ratio usually requires higher octane fuel ? - Answers Yes What procedure is recommended before mounting the engine onto an engine stand ? - Answers Remove the flex plate or fly wheel What vehicle type has the most straight forward procedure for removing the engine ? - Answers RWD Are water based cleaning solutions necessarily biodegradable? - Answers No In which order should cylinder head bolts be removed ? - Answers Starting on inside moving out Why is it a good idea to organizers during removal ? - Answers To remember their proper location Which term best describes the build up of mineral deposits inside the cooling system ? - Answers Scale if it is necessary to remove the a/c compressor what should be done first ? - Answers Evacuate the system What type of parts cleaning method requires additional shot blasting or washing ? - Answers Thermal Which cleaning method loosens dirt from parts using microscopic bubbles created by high frequency sound waves ? - Answers Ultrasonic What is the minimum number of bolts required to safely mount engine to engine stand ? - Answers 4 Which material should not be cleaned with caustic soda ? - Answers Aluminum Is the flex plate or flywheel removable once mounted to the engine stand ? - Answers No Citrus based non toxic determines can be used in a hot jet spray washer ? - Answers Yes Using cleaning ovens are a more environmentally acceptable method than chemical cleaning ? - Answers Yes Should the timing belt cover be removed before the water pump ? - Answers No It is a good idea to immediately discard all gaskets so they don't get accidentally reused ? - Answers No it's a good idea to keep the old gaskets to compare to the new ones Can a hot soak tank be big enough to accommodate an entire engine block ? - Answers Yes To prevent cylinder head war page during disassembly the head bolts should be removed in a specific pattern ? - Answers Yes An electric cooling fan assembly and radiator can be removed together - Answers True FWD cars engines are removed from underneath ? - Answers Yes Why are cylinders deglazed ? - Answers To ensure proper ring sealing Is a cup a type of core plug ? - Answers Yes What is a babbit - Answers A soft material made of tin and lead What is driven by the crankshaft at the front of some engines ? - Answers Timing chain Where is the diameter of the piston measured ? - Answers Skirt What is the main advantage of an automatic honing machine ? - Answers Let's the technician work way more accurately Which procedure should you use to bore a cylinder ? - Answers Bore to the new piston size and Hone to the clearance spec What is the function of the harmonic balancer ? - Answers To absorb torsional vibrations of the crankshaft Each half of a split bearing is made so that it is slightly larger than exactly half. What is this extension called ? - Answers Crush What can happen if the cylinder ridge is not removed ? - Answers The top ring and piston ring groove could be damaged What are most pistons made of ? - Answers Aluminum What type of bearing commonly used to support crank shaft ? - Answers Insert