SOS Mechanic Certificate -Engine Repair
WHICH OF THE FOLLOWING IS TRUE ABOUT ADJUSTING VALVE TAPPET
CLEARANCE
VALVE TAPPET CLEARANCE SHOULD BE ADJUSTED AT TDC AT THE END OF THE
COMPRESSION STROKE.
THE HYDRAULIC LIFTERS ARE NOISY AT HIGHWAY SPEEDS BUT QUIET AT LOW
SPEEDS. WHAT SHOULD YOU DO FIRST AS YOU DIAGNOSE THIS PROBLEM?
CHECK CRANKCASE OIL LEVEL.
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THE VALVE TIMING ON MOST ENGINES IS CONTROLLED BY:
A BELT, CHAIN OR GEAR DRIVE
THE BEARING INSERTS BELOW HAVE BEEN PLASTIGAGED. WHAT CAN YOU
DETERMINE ABOUT THESE PICTURES?
INSERT"A" HAS MORE CLEARANCE.
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?
A BLOWN HEAD GASKET.
EXCESSIVELY WORN VALVE GUIDES:
ALL OF THE ABOVE.
, INTAKE VALVE DEPOSITS, AS SHOWN BELOW:
BOTH B AND C
WHAT IS BEING CHECKED ON THE VALVE SPRING IN THE ILLUSTRATION BELOW?
INSTALLED HEIGHT
YOU ARE USING A VACUUM GAUGE CONNECTED TO THE INTAKE MANIFOLD.
WHICH OF THE FOLLOWING IS TRUE?
WHEN THE ENGINE IS RAPIDLY ACCELERATED, THE NEEDLE WILL RISE TO A HIGH
READING.
WHAT ARE THE MINIMUM AND MAXIMUM MEASUREMENTS OF A SHAFT GIVEN 2.125
PLUS OR MINIUS .015?
2.062-2.250
THE MECHANIC HAS DETERMINED THAT NO FUEL SQUIRTS INTO THE CARBURETOT
WHEN THE THROTTLE IS OPENED QUICKLY. WHAT COULD BE CAUSED BY:
ALL OF THE ABOVE.
A WARM ENGINE HAS LOW OIL PRESSURE. THE MOST LIKELY CAUSE OF THE LOW
OIL PRESSURE IS:
LEAKY MAIN BEARING SEALS
WHAT IS THE READING OF THE 0-1 INCH MICROMETER BELOW?
5.750" wrong 1.599 is prob right answer
YOU ARE REINSTALLING PISTONS WITH NEW RINGS. THE RING COMPRESSOR WILL
NOT FIT TIGHT AROUND A PISTON SKIRT AND THE RINGS BIND ON THE BLOCK
SURFACE. WHAT SHOULD YOU DO?
CHECK THE RING END GAP.
YOU HAVE CHECKED THE CRANKSHAFT AND FOUND THYE FOLLOWING
MEASUREMENTS BELOW. THE ROD JOURNAL SURFACES ARE SMOOTH AND NO
ROD JOURNAL TAPER IS PRESENT. WHAT SHOULD YOU DO? (USE GIVEN
SPECIFICATIONS AND MEASUREMENTS.)
INSTALL STANDARD BEARINGS IN ALL RODS.
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