AUTO ENGINE REPAIR (SOS MICHIGAN VALVE TRAIN) EXAM QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES ALREADY GRADED A+

AUTO ENGINE REPAIR (SOS MICHIGAN VALVE TRAIN) EXAM QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES ALREADY GRADED A+ “What is enclosed in the vehicle vin? - CORRECT ANSWER Engine type, body style, and transmission type." "The most likely cause of a bent push rod? - CORRECT ANSWER Excessive valve guide clearance" "Technician A says that it is important to drive the customers vehicle to verify the complaint as part of your diagnosis procedure. Technician B says its a good idea to check for related TSB's - CORRECT ANSWER Both" "Technician A says the main bearing clearances can be checked with plasty gauges. Technician B says that you can check main bearing clearances with a feeler gauge. Who is correct? - CORRECT ANSWER Tech A" "The oil filter on a customer's car is bulged out. Technician A says this could be caused by an improper filter installation. Technician B says this can only be caused by a pressure regulator that is stuck. Who is correct? - CORRECT ANSWER Tech B" "Internal cracks on a cast iron cylinder head can be located by which of the following methods: A) magnetic particle testing B) pressure testing C) dye penetrate testing D) all the above - CORRECT ANSWER D) all the above" "Typical valve guide clearance would be A) 0.010- 0.020 B) 0.002- 0.005 C) 0.005- 0.010 D) 0.001-0.002 - CORRECT ANSWER D) 0.001-0.002" "Valve margin must be at least? A) 1/8 B) 1/16 C) 1/32 D) 1/64 - CORRECT ANSWER C) 1/32" "Umbrella type valve guide seats are installed: A) before the valve B) before the spring C) with the spring compressed D) on the guide - CORRECT ANSWER B) before the spring" "A concave face on the base of a hydraulic lifter is an indication of? A) overheating B) lack of rotation C) lack of lubrication D) normal wear - CORRECT ANSWER D) normal wear" "Excessive camshaft end play can be caused by? A) written timing gears B) a worn thrust plate C) debris behind the thrust plate D) worn timing chain - CORRECT ANSWER B) a worn thrust plate" "Camshaft lift is the difference between? A) base circle diameter and lobe height B) journal diameter and line height C) camshaft runout and base circle diameter D) base circle runout and lobe height - CORRECT ANSWER A) base circle diameter and lobe height" "All of the following methods can be used to find cracks in aluminum heads EXCEPT: A) pressure test B) magnetic particle detection C) visual inspection D) dye penetrant - CORRECT ANSWER B) magnetic particle detection" "Technician A says that umbrella valve seals are installed in their operating position during cylinder head assembly. Technician B says that positive seals are positioned by the valve. Who is right? - CORRECT ANSWER Neither" "Technician A says that excessive grinding of valve faces and seats allow the valve tips to move to far away from their spring seats. Technician B says grinding the stem tips helps to correct minor changes in valve spring installed height. Who is correct? - CORRECT ANSWER Tech A" "Technician A says that excessive cylinder head or block deck resurfacing on a pushrod engine can change the geometry between the valve stem tip and rocker arm. Technician B says that excessive grinding of the valve face and seat changes the geometry between the valve stem tip and rocker arm. who is correct? - CORRECT ANSWER Both" "Technician A says that a flat tappet hydraulic lifter rotate during operation. Technician B says the face of the lifter should be convex. Who is correct? - CORRECT ANSWER Both" "Technician A says that the valve lash should be adjusted at TDC on the compression stroke. Technician B says that hydraulic lifters should be adjusted at zero lash. who is correct? - CORRECT ANSWER Tech A" "Technician A says that cylinder head bolts should be loosened in the reverse order of the torque sequence. Technician B says that torque to yield head bolts cannot be reused. Who is correct? - CORRECT ANSWER Tech B" "A cylinder head is being disassembled. Technician A says that if a core plug appears OK, then it should be left in place. Technician B says that all studs should be removed. Who is correct? - CORRECT ANSWER Neither" "A valve margin of 1/64 in may cause: A) a clicking noise at idle speed B) valve overheating and burning C) improper valve seating D) valve seat recession - CORRECT ANSWER B) valve overheating and burning" "Valve seats are typically ground to an angle of: A) 15 or 20 degree B) 20 or 30 degree C) 30 or 45 degree D) 45 or 60 degree - CORRECT ANSWER C) 30 or 45 degree" "How do you tell bolt grade? - CORRECT ANSWER The number of lines on the bolt head is 2 less than the actual grade." "How do you know is a bolt is SAE or Metric? - CORRECT ANSWER Metric is marked with numbers and SAE is marked with lines." "What Grade bolt is this? What Type? A.) Grade 3 ; Metric B.) Grade 5; SAE C.) Grade 6; Metric D.) Grade 3; SAE - CORRECT ANSWER B) Grade 5; SAE" "What Grade bolt? Type? A.) Grade 8; SAE B.) Grade 8 ; Metric C.) Grade 6; Metric D.) Grade 4; SAE - CORRECT ANSWER Grade 8; SAE" "What grade bolt? Type? A) Grade 11; SAE B.) Grade 10; SAE C.) Grade 10; Metric D.) Grade 9; Metric - CORRECT ANSWER Grade 10 ; Metric" "What is Plasty gauge? - CORRECT ANSWER Provides a simple but precise method for the measurement of clearance between fitted surfaces." "Piston Slap is defined as: A.) Piston-to-wall clearance (Cold running) B.) Piston ring to cylinder clearance (Hot running) C.) Piston to connecting rod noise (Hot running) D.) Piston to piston pin noise (Cold running) - CORRECT ANSWER A.) Piston to wall clearance (Cold running)" "A compression test shows that one cylinder shows to much leakage. During the air test could be heard coming from the tailpipe what could be the cause? A) bad piston rings B) bad head gasket C) bad exhaust gasket D) exhaust valve not seating - CORRECT ANSWER D.) exhaust valve not seating" "Technician A says that main bearing oil clearances can be checked with plasty gages. Technician B says that main bearing oil clearances can be checked with a feeler gauge. Who is Correct? - CORRECT ANSWER Tech A" "An engine is burning to much oil. Technician A says its the valve guides. Technician B says its tapered cylinder walls. Who is correct? - CORRECT ANSWER Both" "A compression test is being done on an in- line four cylinder engine. Cylinder two and three have readings of 10 psi cylinder one has a reading of 140 psi and cylinder four has 145psi. Technician A says its a blown head gasket Technician B says its bad valve timing. - CORRECT ANSWER Tech A" "What is the most likely cause of low fuel pressure in a fuel injection engine? A) clogged fuel filter B) clogged injector C) restricted fuel line D) stuck closed pressure regulator - CORRECT ANSWER A) clogged fuel filter" "The pressure and volume of a mechanical fuel pump are both below spec. Technician A says that an air leak in the fuel line between the tank and the pump could be the cause. Technician B says that a plugged fuel tank pick-up filter is the cause. - CORRECT ANSWER Both" "Technician A says that a turbocharger boost is controlled by a wastegate. Technician B says the wastegate is controlled by the engine vacuum. Who is correct? - CORRECT ANSWER Both" "NATEF certifies automotive: A) dealerships B) independent garages C) technicians D) training programs - CORRECT ANSWER D) training programs" "All of these are ASE certifications except A) automotive transmission/ transaxle B) engine repair C) service and maintenance D) suspension and steering - CORRECT ANSWER C) service and maintenance" "Which part is most likely the problem if a light does not come on during an instrument panel bulb check? A) bulb B) fuse C) sender D) switch - CORRECT ANSWER A) bulb" "What organization certifies automotive technicians? A) ASE B) AYES C) NATEF D) OSHA - CORRECT ANSWER A) ASE" "Which engine oil has lubricating properties? A) conventional oil B) crude oil C) plain oil D) synthetic oil - CORRECT ANSWER D) synthetic oil" "Technician A says an ABS will pulsate the breaks during hard stops. Technician B says ABS breaks are found only on vehicles that have been imported. Who is correct? - CORRECT ANSWER Tech A" "Before servicing the supplemental restraint system, what should a technician do as a safety precaution? A) cut the wires B) disarm the system C) probe the wires with a test light D) remove the airbag - CORRECT ANSWER B) disarm the system" "Which of the following is NOT required when replacing a cylinder head gasket? A) checking for warpage B) checking for squareness C) checking for leakage D) cleaning the bolt holes - CORRECT ANSWER B) checking for squareness" "Cylinder head gasket failure may be due to all of the following except: A) coolant leaks B) compression leaks C) oil leaks D) vacuum leaks - CORRECT ANSWER D) vacuum leaks" "Which of the following should be checked before disassembling the cylinder head? A) rocket arm alignment B) OHC cam bore alignment C) valve spring installed height D) surface warpage - CORRECT ANSWER C) valve spring installed height" "Which of the following is NOT a method of correcting excessive valve stem to guide clearance? A) knurling the valve face B) knurled the guide C) reaming for oversize D) guide replacement - CORRECT ANSWER D) guide replacement" "To raise the seat contact on the valve face above, which combination of stones should be used? A) 45 degree and 60 degree stones B) 30 degree and 45 degree stones C) 15 degree and 30 degree stones D) 30 degree and 60 degree stones - CORRECT ANSWER A) 45 degree and 60 degree stones" "Camshaft lift is defined as: A) the distance the valves are open B) the height of the lobes on the camshaft C) the time the valves stay open D) the time the valves stay closed - CORRECT ANSWER B) the height of the lobes on the camshaft" "Technician A says that a burned valve could be the result of too little valve lash. Technician B says excessive valve lash could cause very fast camshaft wear. Who is right? - CORRECT ANSWER Both" "A taping noise can be heard coming from the upper part of an engine running at idle. which of the following could be the cause? A) valve clearance out of adjustment B) worn rocker arm shaft C) loose exhaust manifold D) all the above - CORRECT ANSWER D) all the above" "When a cylinder head is disassembled, the stem height on one valve is found to be to high. Which of the following can be correct? A) regrind the valve B) regrind the valve seat C) install a new valve seat D) install a shim - CORRECT ANSWER C) install a new valve seat" "Technician A says that the finish left on the cylinder head by a resurfacing machine must be appropriate for the head gasket that will be used. Technician B says that the finish can be checked with a metal card that has sample patches of various surface textures. Who is correct? - CORRECT ANSWER Both" "After reassembling a hydraulic lifter, Technician A says that is should be tested with a leak down tester. Technician B says that the leak down rate is how far the lifter plunger moves within a set time period. Who is correct? - CORRECT ANSWER Both" "When a cylinder head with an overhead camshaft is discovered to be warped, which of the following is the MOST correct repair option? A) replace the head B) check for cracks, straighten the head, resurface the head C) resurface the head, then straighten it D) straighten the head, resurface the head, check for cracks - CORRECT ANSWER B" "Technician A is rebuilding an engine with a timing chain. Technician B is rebuilding an engine with a timing belt. Technician A says that the timing chain is stretched and must be replaced, however, the timing sprockets appear to be in good shape so they can be refused. Technician B says he is replacing the timing belt and that this requires him to also replace the timing sprockets. Who is correct? - CORRECT ANSWER Neither" "Technician A says that threads and the underside of the hex head on a bolt must be cleaned to obtain correct torque. Technician B says that clamping force measured when reading a torque wrench will be changed when using thread lubricants. Who is correct? - CORRECT ANSWER Both" "Two technicians are discussing engine valve seals. Technician A says to apply a light coat of engine oil to new oil seals and push them in. Technician B says you can install the intake oil seal into the exhaust side or install the exhaust oil seal into the intake side because they are interchangeable. Who is correct? - CORRECT ANSWER Tech A" "Valve adjustment is necessary following the replacement of a: A) crankshaft B) piston C) balancer D) cylinder head - CORRECT ANSWER D) cylinder head" "Technician A says that a steel scraper should be used to clean the gasket surfaces on aluminum cylinder head. Technician B says that some manufacturers provide a torque sequence for head bolts on aluminum cylinder heads. Who is correct? - CORRECT ANSWER Tech B" "A feeler gauge measurement is 0.014 in. Technician A says that the cylinder head should be resurfaced. Technician B says that the block warpage should be measured. Who is correct? - CORRECT ANSWER Both" "Technician A says that the first step is using a thread insert is to use a tap to thread the opening to match the external threads on the replacement threads. Technician B says that the thread insert should be installed with the proper sized drill but. Who is correct? - CORRECT ANSWER Neither" "Technician A says that when measuring valve spring tension, the measurement should be taken with the spring at the installed height. Technician B says that if a shim is to be used under the valve spring, the shim should be installed under the spring in the tension gauge. Who is correct? - CORRECT ANSWER Both" "Technician A says that worn valve lock groves may cause the valve locks to fly out of place with the engine running, resulting in severe engine damage. Technician B says that worn valve lock groves may cause a clicking noise with the engine idling. Who is correct? - CORRECT ANSWER Tech A" "Technician A says that worn valve stem seals may cause rapid valve stem and guide wear. Technician B says that worn valve stem seals may cause excessive oil consumption. Who is correct? - CORRECT ANSWER Tech B" "Technician A says the valve stems and guides should be measured at vertical locations. Technician B says that valve guide diameter should be measured with a hold, or snap gauge. Who is correct? - CORRECT ANSWER Both" "Technician A says that excessive valve spring tension may cause bent pushrods. Technician B says that improper valve timing may cause bent pushrods. Who is correct? - CORRECT ANSWER Both" "Technician A says that hydraulic valve lifter bottoms should be flat or concave. Technician B says that a sticking lifter plunger may cause a burned exhaust valve. Who is correct? - CORRECT ANSWER Tech B" "Technician A says that excessive camshaft bearing clearances may result in lower than specified oil pressure. Technician B says that excessive camshaft bearing clearance may cause a thumping noise when the engine is idling. Who is correct? - CORRECT ANSWER Tech A" "A transverse mounted engine with front wheel drive must be removed from the car. All of the following are generally recommended EXCEPT: A) removing the engine and transaxle ad a unit B) Disconnecting the speedometer cable C) Disconnecting the half shafts D) removing the differential gears - CORRECT ANSWER D) removing the differential gears"