ENGINE REPAIR MICHIGAN
MECHANIC STUDY GUIDE
QUESTIONS WITH COMPLETE
SOLUTIONS | VERIFIED
/. WHICH OF THE FOLLOWING IS TRUE ABOUT ADJUSTING VALVE TAPPET
CLEARANCE - Answer-✅A. THE VALVE TAPPET CLEARENCE ON A HIGH
MILEAGE EGINE SHOULD BE ADJUSTED TIGHTER THAN SPECIFICATIONS FOR
A NEWLY REBUILT ENGINE.
B. VALVE TAPPET CLEARANCE SHOULD BE ADJUSTED AT TDC AT THE END OF
THE COMPRESSION STROKE. (CORRECT AWNSER)
C. VALVE TAPPET CLEARANCE SHOULD BE ADJUSTED AT BDC AT THE END OF
THE EXHAUST STROKE.
D. NONE OF THE ABOVE. (NOT CORRECT AWNSER)
/.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)
/.WHAT ARE THE MINIMUM AND MAXIMUM MEASUREMENTS OF A SHAFT GIVEN
2.125 PLUS OR MINIUS .015? - Answer-✅A. 2.062-2.250 (NOT CORRECT AWNSER)
B. 1.975-2.275
C. 2.110-2.140 (CORRECT AWNSER)
D. 2.124-2.126
/.THE MECHANIC HAS DETERMINED THAT NO FUEL SQUIRTS INTO THE
CARBURETOT WHEN THE THROTTLE IS OPENED QUICKLY. WHAT COULD BE
CAUSED BY: - Answer-✅A. DISCONNECTED LINKAGE.
B. A HARDENED ACCELERATOR PUMP PLUNGER.
C. A PLUGGED PUMP NOZZLE.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
MECHANIC STUDY GUIDE
QUESTIONS WITH COMPLETE
SOLUTIONS | VERIFIED
/. WHICH OF THE FOLLOWING IS TRUE ABOUT ADJUSTING VALVE TAPPET
CLEARANCE - Answer-✅A. THE VALVE TAPPET CLEARENCE ON A HIGH
MILEAGE EGINE SHOULD BE ADJUSTED TIGHTER THAN SPECIFICATIONS FOR
A NEWLY REBUILT ENGINE.
B. VALVE TAPPET CLEARANCE SHOULD BE ADJUSTED AT TDC AT THE END OF
THE COMPRESSION STROKE. (CORRECT AWNSER)
C. VALVE TAPPET CLEARANCE SHOULD BE ADJUSTED AT BDC AT THE END OF
THE EXHAUST STROKE.
D. NONE OF THE ABOVE. (NOT CORRECT AWNSER)
/.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)
/.WHAT ARE THE MINIMUM AND MAXIMUM MEASUREMENTS OF A SHAFT GIVEN
2.125 PLUS OR MINIUS .015? - Answer-✅A. 2.062-2.250 (NOT CORRECT AWNSER)
B. 1.975-2.275
C. 2.110-2.140 (CORRECT AWNSER)
D. 2.124-2.126
/.THE MECHANIC HAS DETERMINED THAT NO FUEL SQUIRTS INTO THE
CARBURETOT WHEN THE THROTTLE IS OPENED QUICKLY. WHAT COULD BE
CAUSED BY: - Answer-✅A. DISCONNECTED LINKAGE.
B. A HARDENED ACCELERATOR PUMP PLUNGER.
C. A PLUGGED PUMP NOZZLE.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
