SOS MECHANIC ASSESSMENT 2026
QUESTIONS AND ANSWERS GUARANTEED TO
PASS
◉ 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.
Who is correct? Answer: Both
◉ NATEF certifies automotive:
A) dealerships
B) independent garages
QUESTIONS AND ANSWERS GUARANTEED TO
PASS
◉ 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.
Who is correct? Answer: Both
◉ NATEF certifies automotive:
A) dealerships
B) independent garages
