SOS MECHANIC CERTIFICATE -ENGINE REPAIR || 50+
QUESTIONS WITH VERIFIED ANSWERS || 2025 || COMPLETE
A” GUIDE
1. WHICH OF THE FOLLOWING IS TRUE ABOUT ADJUST- VALVE TAPPET CLEARANCE
ING VALVE TAPPET CLEARANCE SHOULD BE ADJUSTED AT
TDC AT THE END OF THE
COMPRESSION STROKE.
2. THE HYDRAULIC LIFTERS ARE NOISY AT HIGHWAY CHECK CRANKCASE OIL
SPEEDS BUT QUIET AT LOW SPEEDS. WHAT SHOULD LEVEL.
YOU DO FIRST AS YOU DIAGNOSE THIS PROBLEM?
3. THE VALVE TIMING ON MOST ENGINES IS CON- A BELT, CHAIN OR GEAR
TROLLED BY: DRIVE
4. THE BEARING INSERTS BELOW HAVE BEEN PLASTI- INSERT"A" HAS MORE
GAGED. WHAT CAN YOU DETERMINE ABOUT THESE CLEARANCE.
PICTURES?
5. THE COMPRESSION TEST HAS SHOWED THAT THE MID- A BLOWN HEAD GASKET.
DLE 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?
6. EXCESSIVELY WORN VALVE GUIDES: ALL OF THE ABOVE.
7. INTAKE VALVE DEPOSITS, AS SHOWN BELOW: BOTH B AND C
8. WHAT IS BEING CHECKED ON THE VALVE SPRING IN INSTALLED HEIGHT
THE ILLUSTRATION BELOW?
9. YOU ARE USING A VACUUM GAUGE CONNECTED TO WHEN THE ENGINE
THE INTAKE MANIFOLD. WHICH OF THE FOLLOWING IS RAPIDLY ACCELERATED,
IS TRUE? THE NEEDLE WILL RISE TO
A HIGH READING.
, SOS MECHANIC CERTIFICATE -ENGINE REPAIR || 50+
QUESTIONS WITH VERIFIED ANSWERS || 2025 || COMPLETE
A” GUIDE
10. WHAT ARE THE MINIMUM AND MAXIMUM MEASURE- 2.062-2.250
MENTS OF A SHAFT GIVEN 2.125 PLUS OR MINIUS
.015?
11. THE MECHANIC HAS DETERMINED THAT NO FUEL ALL OF THE ABOVE.
SQUIRTS INTO THE CARBURETOT WHEN THE THROT-
TLE IS OPENED QUICKLY. WHAT COULD BE CAUSED BY:
12. A WARM ENGINE HAS LOW OIL PRESSURE. THE MOST LEAKY MAIN BEARING
LIKELY CAUSE OF THE LOW OIL PRESSURE IS: SEALS
13. WHAT IS THE READING OF THE 0-1 INCH MICROMETER 5.750" wrong 1.599 is
BELOW? prob right answer
14. YOU ARE REINSTALLING PISTONS WITH NEW RINGS. CHECK THE RING END GAP.
THE RING COMPRESSOR WILL NOT FIT TIGHT AROUND
A PISTON SKIRT AND THE RINGS BIND ON THE BLOCK
SURFACE. WHAT SHOULD YOU DO?
15. YOU HAVE CHECKED THE CRANKSHAFT AND FOUND INSTALL STANDARD BEAR-
THYE FOLLOWING MEASUREMENTS BELOW. THE ROD INGS IN ALL RODS.
JOURNAL SURFACES ARE SMOOTH AND NO ROD JOUR-
NAL TAPER IS PRESENT. WHAT SHOULD YOU DO? (USE
GIVEN SPECIFICATIONS AND MEASUREMENTS.)
16. YOU HAVE MEASURED THE CYLINDERS AND OBTAINED DEGLAZE CYLINDERS, USE
THE MEASUREMENTS GIVEN BELOW. ALL THE CYLIN- ORIGINAL PISTONS AND
DERS ARE SMOOTH AND THE PISTONS ARE REUSE- NEW STANDARD RINGS.
ABLE. WHAT SHOULD THE MECHANIC DO?
17. REFER TO THE MANUFACTURER'S SPECIFICATIONS IN ADDING MEASUREMENT
THE IMAGE. YOU COULD FIND THE AMOUNT OF BORE "C" AND "D" TOGEATHER.
TAPER BY: SUBTRACTING MEASURE-
QUESTIONS WITH VERIFIED ANSWERS || 2025 || COMPLETE
A” GUIDE
1. WHICH OF THE FOLLOWING IS TRUE ABOUT ADJUST- VALVE TAPPET CLEARANCE
ING VALVE TAPPET CLEARANCE SHOULD BE ADJUSTED AT
TDC AT THE END OF THE
COMPRESSION STROKE.
2. THE HYDRAULIC LIFTERS ARE NOISY AT HIGHWAY CHECK CRANKCASE OIL
SPEEDS BUT QUIET AT LOW SPEEDS. WHAT SHOULD LEVEL.
YOU DO FIRST AS YOU DIAGNOSE THIS PROBLEM?
3. THE VALVE TIMING ON MOST ENGINES IS CON- A BELT, CHAIN OR GEAR
TROLLED BY: DRIVE
4. THE BEARING INSERTS BELOW HAVE BEEN PLASTI- INSERT"A" HAS MORE
GAGED. WHAT CAN YOU DETERMINE ABOUT THESE CLEARANCE.
PICTURES?
5. THE COMPRESSION TEST HAS SHOWED THAT THE MID- A BLOWN HEAD GASKET.
DLE 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?
6. EXCESSIVELY WORN VALVE GUIDES: ALL OF THE ABOVE.
7. INTAKE VALVE DEPOSITS, AS SHOWN BELOW: BOTH B AND C
8. WHAT IS BEING CHECKED ON THE VALVE SPRING IN INSTALLED HEIGHT
THE ILLUSTRATION BELOW?
9. YOU ARE USING A VACUUM GAUGE CONNECTED TO WHEN THE ENGINE
THE INTAKE MANIFOLD. WHICH OF THE FOLLOWING IS RAPIDLY ACCELERATED,
IS TRUE? THE NEEDLE WILL RISE TO
A HIGH READING.
, SOS MECHANIC CERTIFICATE -ENGINE REPAIR || 50+
QUESTIONS WITH VERIFIED ANSWERS || 2025 || COMPLETE
A” GUIDE
10. WHAT ARE THE MINIMUM AND MAXIMUM MEASURE- 2.062-2.250
MENTS OF A SHAFT GIVEN 2.125 PLUS OR MINIUS
.015?
11. THE MECHANIC HAS DETERMINED THAT NO FUEL ALL OF THE ABOVE.
SQUIRTS INTO THE CARBURETOT WHEN THE THROT-
TLE IS OPENED QUICKLY. WHAT COULD BE CAUSED BY:
12. A WARM ENGINE HAS LOW OIL PRESSURE. THE MOST LEAKY MAIN BEARING
LIKELY CAUSE OF THE LOW OIL PRESSURE IS: SEALS
13. WHAT IS THE READING OF THE 0-1 INCH MICROMETER 5.750" wrong 1.599 is
BELOW? prob right answer
14. YOU ARE REINSTALLING PISTONS WITH NEW RINGS. CHECK THE RING END GAP.
THE RING COMPRESSOR WILL NOT FIT TIGHT AROUND
A PISTON SKIRT AND THE RINGS BIND ON THE BLOCK
SURFACE. WHAT SHOULD YOU DO?
15. YOU HAVE CHECKED THE CRANKSHAFT AND FOUND INSTALL STANDARD BEAR-
THYE FOLLOWING MEASUREMENTS BELOW. THE ROD INGS IN ALL RODS.
JOURNAL SURFACES ARE SMOOTH AND NO ROD JOUR-
NAL TAPER IS PRESENT. WHAT SHOULD YOU DO? (USE
GIVEN SPECIFICATIONS AND MEASUREMENTS.)
16. YOU HAVE MEASURED THE CYLINDERS AND OBTAINED DEGLAZE CYLINDERS, USE
THE MEASUREMENTS GIVEN BELOW. ALL THE CYLIN- ORIGINAL PISTONS AND
DERS ARE SMOOTH AND THE PISTONS ARE REUSE- NEW STANDARD RINGS.
ABLE. WHAT SHOULD THE MECHANIC DO?
17. REFER TO THE MANUFACTURER'S SPECIFICATIONS IN ADDING MEASUREMENT
THE IMAGE. YOU COULD FIND THE AMOUNT OF BORE "C" AND "D" TOGEATHER.
TAPER BY: SUBTRACTING MEASURE-
