Michigan SOS Mechanic Engine Tune-up Questions and Answers
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 1 / 3
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)
- INSERT "B" HAS MORE CLEARANCE.
- 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) 2 / 3
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.
- A "NORMAL" GAUGE READING AT IDLE WOULD BE 7-10 INCHES.
- ALL OF THE ABOVE. (NOT CORRECT AWNSER)
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