ENGINE REPAIR MICHIGAN MECHANIC
COMPREHENSIVE EXAM 2026 QUESTIONS
AND ANSWERS 100% CORRECT
◉ THE HYDRAULIC LIFTERS ARE NOISY AT HIGHWAY SPEEDS
BUT QUIET AT LOW SPEEDS. WHAT SHOULD YOU DO FIRST AS
YOU DIAGNOSE THIS PROBLEM. ANSWER: A. CHECK LIFTER
LEAKDOWN RATE.
B. CHECK CRANKCASE OIL LEVEL. (CORRECT AWNSER)
C. CHECK LIFTER CLEARANCE HOT. (NOT CORRECT AWNSER)
D. CHECK LIFTER CLEARANCE COLD.
◉ THE VALVE TIMING ON MOST ENGINES IS CONTROLLED
BY:. ANSWER: A. AN ON BOARD COMPUTER. (NOT CORRECT
AWNSER)
B. A CENTRIFUGAL ADVANCE UNIT.
C. A VACUUM ADVANCE UNIT
D. A BELT, CHAIN OR GEAR DRIVE. (CORRECT AWNSER)
◉ THE BEARING INSERTS BELOW HAVE BEEN PLASTIGAGED.
WHAT CAN YOU DETERMINE ABOUT THESE PICTURES.
,ANSWER: A. BOTH BEARING JOURNALS ARE OUT OF ROUND.
(NOT CORRECT AWNSER)
B. INSERT "B" HAS MORE CLEARANCE.
C. INSERT"A" HAS MORE CLEARANCE.
D. BOTH BEARINGS HAVE EXCESSIVE TAPER.
◉ THE COMPRESSION TEST HAS SHOWED THAT THE MIDDLE
TWO CYLINDERS ON ONE SIDE OF A V-8 ENGINE HAD
READINGS OF 50 PSI. THE OTHER CYLINDERS HAD READINGS
BETWEEN 135 PSI AND 140 PSI. WHAT IS THE LIKELY CAUSE
OF THIS CONDITION. ANSWER: A. A BURNED EXHAUST VALVE
B. A BLOWN INTAKE MANIFOLD GASKET.
C. A BLOWN HEAD GASKET. (CORRECT AWNSER)
D. A BURNED INTAKE VALVE. (NOT CORRECT AWNSER)
◉ EXCESSIVELY WORN VALVE GUIDES:. ANSWER: A. MAY BE
REPLACED IF REMOVABLE.
B. MAY BE REAMED TO OVERSIZE.
C. MAY CAUSE OIL CONSUMPTION.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
◉ INTAKE VALVE DEPOSITS, AS SHOWN BELOW:. ANSWER: A.
WILL NOT AFFECT ENGINE PERFORMANCE.
, B. CAN REDUCE VOLUMETRIC EFFICIENCY AND AFFECT
HIGH RPM PERFORMANCE.
C. CAN CAUSE DRIVEABILITY PROBLEMS DURING COLD
ENGINE OPERATION.
D. BOTH B AND C. (CORRECT AWNSER)
◉ WHAT IS BEING CHECKED ON THE VALVE SPRING IN THE
ILLUSTRATION BELOW. ANSWER: A. INSTALLED HEIGHT
(CORRECT AWNSER)
B. SQUARENESS
C. COIL TAPER
D. TENSION (NOT CORRECT AWNSER)
◉ YOU ARE USING A VACUUM GAUGE CONNECTED TO THE
INTAKE MANIFOLD. WHICH OF THE FOLLOWING IS TRUE.
ANSWER: A. WHEN THE ENGINE IS RAPIDLY ACCELERATED,
THE NEEDLE WILL RISE TO A HIGH READING. (POSSIBLE
CORRECT AWNSER)
B. WHEN THE THROTLE IS RELEASED SUDDENLY FROM 2500
RPM, THE NEEDLE WILL SNAP TO A HIGHER THAN NORMAL
READING FOR AN INSTANT.
C. A "NORMAL" GAUGE READING AT IDLE WOULD BE 7-10
INCHES.
D. ALL OF THE ABOVE. (NOT CORRECT AWNSER)
COMPREHENSIVE EXAM 2026 QUESTIONS
AND ANSWERS 100% CORRECT
◉ THE HYDRAULIC LIFTERS ARE NOISY AT HIGHWAY SPEEDS
BUT QUIET AT LOW SPEEDS. WHAT SHOULD YOU DO FIRST AS
YOU DIAGNOSE THIS PROBLEM. ANSWER: A. CHECK LIFTER
LEAKDOWN RATE.
B. CHECK CRANKCASE OIL LEVEL. (CORRECT AWNSER)
C. CHECK LIFTER CLEARANCE HOT. (NOT CORRECT AWNSER)
D. CHECK LIFTER CLEARANCE COLD.
◉ THE VALVE TIMING ON MOST ENGINES IS CONTROLLED
BY:. ANSWER: A. AN ON BOARD COMPUTER. (NOT CORRECT
AWNSER)
B. A CENTRIFUGAL ADVANCE UNIT.
C. A VACUUM ADVANCE UNIT
D. A BELT, CHAIN OR GEAR DRIVE. (CORRECT AWNSER)
◉ THE BEARING INSERTS BELOW HAVE BEEN PLASTIGAGED.
WHAT CAN YOU DETERMINE ABOUT THESE PICTURES.
,ANSWER: A. BOTH BEARING JOURNALS ARE OUT OF ROUND.
(NOT CORRECT AWNSER)
B. INSERT "B" HAS MORE CLEARANCE.
C. INSERT"A" HAS MORE CLEARANCE.
D. BOTH BEARINGS HAVE EXCESSIVE TAPER.
◉ THE COMPRESSION TEST HAS SHOWED THAT THE MIDDLE
TWO CYLINDERS ON ONE SIDE OF A V-8 ENGINE HAD
READINGS OF 50 PSI. THE OTHER CYLINDERS HAD READINGS
BETWEEN 135 PSI AND 140 PSI. WHAT IS THE LIKELY CAUSE
OF THIS CONDITION. ANSWER: A. A BURNED EXHAUST VALVE
B. A BLOWN INTAKE MANIFOLD GASKET.
C. A BLOWN HEAD GASKET. (CORRECT AWNSER)
D. A BURNED INTAKE VALVE. (NOT CORRECT AWNSER)
◉ EXCESSIVELY WORN VALVE GUIDES:. ANSWER: A. MAY BE
REPLACED IF REMOVABLE.
B. MAY BE REAMED TO OVERSIZE.
C. MAY CAUSE OIL CONSUMPTION.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
◉ INTAKE VALVE DEPOSITS, AS SHOWN BELOW:. ANSWER: A.
WILL NOT AFFECT ENGINE PERFORMANCE.
, B. CAN REDUCE VOLUMETRIC EFFICIENCY AND AFFECT
HIGH RPM PERFORMANCE.
C. CAN CAUSE DRIVEABILITY PROBLEMS DURING COLD
ENGINE OPERATION.
D. BOTH B AND C. (CORRECT AWNSER)
◉ WHAT IS BEING CHECKED ON THE VALVE SPRING IN THE
ILLUSTRATION BELOW. ANSWER: A. INSTALLED HEIGHT
(CORRECT AWNSER)
B. SQUARENESS
C. COIL TAPER
D. TENSION (NOT CORRECT AWNSER)
◉ YOU ARE USING A VACUUM GAUGE CONNECTED TO THE
INTAKE MANIFOLD. WHICH OF THE FOLLOWING IS TRUE.
ANSWER: A. WHEN THE ENGINE IS RAPIDLY ACCELERATED,
THE NEEDLE WILL RISE TO A HIGH READING. (POSSIBLE
CORRECT AWNSER)
B. WHEN THE THROTLE IS RELEASED SUDDENLY FROM 2500
RPM, THE NEEDLE WILL SNAP TO A HIGHER THAN NORMAL
READING FOR AN INSTANT.
C. A "NORMAL" GAUGE READING AT IDLE WOULD BE 7-10
INCHES.
D. ALL OF THE ABOVE. (NOT CORRECT AWNSER)
