SOS MECHANIC CERTIFICATE ENGINE
REPAIR COMPREHENSIVE EXAM STUDY
GUIDE COMPLETE QUESTIONS AND
SOLUTIONS
●● 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
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?
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?
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.
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
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.
Answer: Both
, ●● The most likely cause of a bent push rod?
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
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?
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?
Answer: 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.
REPAIR COMPREHENSIVE EXAM STUDY
GUIDE COMPLETE QUESTIONS AND
SOLUTIONS
●● 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
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?
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?
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.
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
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.
Answer: Both
, ●● The most likely cause of a bent push rod?
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
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?
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?
Answer: 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.
