If an engine experiences a sharp, metallic rapping noise only when it is idling, the trouble could be worn:
`Main bearings
`Piston pins
`connecting rod bearings
`piston skirts correct answers Piston pins
On a port fuel-injected engine, the cause of excessive black smoke in the exhaust cou...
On a port fuel-injected engine, the cause of excessive black smoke in the exhaust could be:
`low fuel pressure
`an intake manifold vacuum leak
`high oxygen sensor voltage
`high fuel pressure correct answers High fuel pressure
During a cylinder power balance test on a four-cylinder port fuel-injected engine, one cylinder has a 75-
rpm drop and the other cylinders have a 125-rpm drop. Technician A says that the cylinder with a 75-rpm
drop may have a burned exhaust valve. Technician B says that the cylinder with the 75-rpm drop may
have a bad fuel injector. Who is correct?
A only
B only
Both A and B
Neither A nor B correct answers Both A and B
While discussing cylinder head service, Technician A says that torque-to-yield bolts may be reused if
they are not damaged. Technician B says that torque-to-yield bolts are usually tightened to a specific
torque and then rotated a certain number of degrees. Who is correct?
A only
B only
, Both A and B
Neither A nor B correct answers B only
The cause of excessive valve stem height could be:
`An improperly installed valve guide
`excessive material machined from the head surface
`a worn valve guide and stem
`excessive material removed from the valve seat correct answers excessive material removed from the
valve seat
While diagnosing an engines timing belt condition, Technician A says that some vehicle manufacturers
recommend checking timing belt wear by measuring the installed length of the belt tensioner. Technician
B says that on some engines the valves will strike the top of the pistons if the timing belt jump breaks.
Who is correct?
A only
B only
Both A and B
Neither A nor B correct answers Both A and B
While discussing engine sealants, Technician A says that RTV sealer dries in the absence of air.
Technician B says that anaerobic sealer dries in the absence of air. Who is correct?
A only
B only
Both A and B
Neither A nor B correct answers B only
While measuring cylinder taper and out-of-round, Technician A says that the cylinder diameter should be
measured at two vertical locations. Technician B says that cylinder our-of-round is the difference between
the cylinder diameter in the thrust and axial directions. Who is correct?
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