Download Auto Engine Repair (SOS Michigan Test Prep Valve Train) 2024 Questions & Answers and more Exams Mechanical Engineering in PDF only on Docsity!
Auto Engine Repair (SOS Michigan Test
Prep Valve Train) 2024 Questions &
Answers | 100% Correct | Verified
What is enclosed in the vehicle vin? - ✔✔Engine type, body style, and transmission type. 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 - ✔✔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? - ✔✔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? - ✔✔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. - ✔✔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 - ✔✔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. - ✔✔Both The most likely cause of a bent push rod? - ✔✔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 - ✔✔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? - ✔✔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? - ✔✔Tech B 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? - ✔✔Both NATEF certifies automotive: A) dealerships B) independent garages C) technicians
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 - ✔✔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
- ✔✔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 - ✔✔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 - ✔✔C) valve spring installed height 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 - ✔✔D) all the above Typical valve guide clearance would be A) 0.010- 0. B) 0.002- 0. C) 0.005- 0. D) 0.001-0.002 - ✔✔D) 0.001-0. Valve margin must be at least? A) 1/ B) 1/ C) 1/ D) 1/64 - ✔✔C) 1/ Umbrella type valve guide seats are installed: A) before the valve B) before the spring C) with the spring compressed D) on the guide - ✔✔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 - ✔✔D) normal wear Excessive camshaft end play can be caused by?
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? - ✔✔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 - ✔✔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 - ✔✔C) install a new valve seat 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 - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔Neither 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? - ✔✔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? - ✔✔Both
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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔Both 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 - ✔✔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 - ✔✔C) 30 or 45 degree 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? - ✔✔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? - ✔✔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? - ✔✔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 - ✔✔D) removing the differential gears How do you tell bolt grade? - ✔✔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? - ✔✔Metric is marked with numbers and SAE is marked with lines.
