ENGINE REPAIR MICHIGAN MECHANIC STUDY GUIDE
ENGINE MECHANICS
WHEN ADJUSTING VALVE TAPPET CLEARANCE ON A HIGH MILEAGE ENGINE, WHAT SHOULD YOU DO
DIFFERENTLY COMPARED TO A NEWLY REBUILT ENGINE? ADJUST THE VALVE TAPPET CLEARANCE
TIGHTER THAN SPECIFICATIONS FOR A NEWLY REBUILT ENGINE.
WHERE S...
WHEN ADJUSTING VALVE TAPPET CLEARANCE ON A HIGH MILEAGE ENGINE, WHAT SHOULD YOU DO
DIFFERENTLY COMPARED TO A NEWLY REBUILT ENGINE? ADJUST THE VALVE TAPPET CLEARANCE
TIGHTER THAN SPECIFICATIONS FOR A NEWLY REBUILT ENGINE.
WHERE SHOULD YOU CHECK THE HYDRAULIC LIFTERS IF THEY ARE NOISY AT HIGHWAY SPEEDS BUT
QUIET AT LOW SPEEDS? CHECK THE CRANKCASE OIL LEVEL FIRST.
WHAT CONTROLS THE VALVE TIMING ON MOST ENGINES? A BELT, CHAIN, OR GEAR DRIVE.
WHAT CAN YOU DETERMINE FROM THE BEARING INSERTS BELOW? BOTH BEARING JOURNALS ARE OUT
OF ROUND.
WHAT IS THE LIKELY CAUSE OF A COMPRESSION TEST SHOWING 50 PSI IN THE MIDDLE TWO CYLINDERS
ON ONE SIDE OF A V-8 ENGINE, WHILE THE OTHER CYLINDERS READ BETWEEN 135-140 PSI? A BLOWN
HEAD GASKET.
TOOLS AND MEASUREMENTS
WHAT IS BEING CHECKED ON THE VALVE SPRING IN THE ILLUSTRATION BELOW? INSTALLED HEIGHT.
WHAT ARE THE MINIMUM AND MAXIMUM MEASUREMENTS OF A SHAFT GIVEN 2.125 PLUS OR MINUS
0.015? 2.110-2.140.
TROUBLESHOOTING
, IF A MECHANIC FINDS THAT NO FUEL SQUIRTS INTO THE CARBURETOR WHEN THE THROTTLE IS OPENED
QUICKLY, WHAT COULD BE THE CAUSE? DISCONNECTED LINKAGE, A HARDENED ACCELERATOR PUMP
PLUNGER, OR A PLUGGED PUMP NOZZLE.
WHAT IS THE MOST LIKELY CAUSE OF LOW OIL PRESSURE IN A WARM ENGINE? LEAKY MAIN BEARING
SEALS.
PISTONS AND RINGS
WHAT SHOULD YOU DO IF A RING COMPRESSOR WON'T FIT TIGHTLY AROUND A PISTON SKIRT AND THE
RINGS BIND ON THE BLOCK SURFACE? CHECK THE RING END GAP.
CRANKSHAFT AND RODS
WHAT SHOULD YOU DO IF YOU FIND THAT THE ROD JOURNAL SURFACES ARE SMOOTH AND THERE IS
NO ROD JOURNAL TAPER PRESENT? INSTALL STANDARD BEARINGS IN ALL RODS.
YOU HAVE MEASURED THE CYLINDERS AND OBTAINED THE MEASUREMENTS GIVEN BELOW. ALL THE
CYLINDERS ARE SMOOTH AND THE PISTONS ARE REUSEABLE. WHAT SHOULD THE MECHANIC DO? ✔️A.
HAVE THE BLOCK HONED OVERSIZE AND USE OVERSIZE PINTONS.
B. HAVE THE BLOCK BORED 0.010" OVERSIZE. THERE IS TOO MUCH OUT-OF-ROUND. (NOT CORRECT
AWNSER)
C. HAVE THE BLOCK BORED 0.010" OVERSIZE. THERE IS TOO MUCH TAPER.
D. DEGLAZE CYLINDERS, USE ORIGINAL PISTONS AND NEW STANDARD RINGS. (CORRECT AWNSER)
REFER TO THE MANUFACTURER'S SPECIFICATIONS IN THE IMAGE. YOU COULD FIND THE AMOUNT OF
BORE TAPER BY: ✔️A. ADDING MEASUREMENT "C" AND "D" TOGEATHER.
B. SUBTRACTING MEASUREMENT "D" FROM MEASUREMENT "C".
C. SUBTRACTING MEASUREMENT "A" FROM MEASUREMNT "B".
D. ADDING MEASUREMENT "A" AND "B" TOGEATHER. (NOT CORRECT AWNSER)
VALVE-TAPPET CLEARANCE ON A RUNNING ENGINE WITH HYDRAULIC LIFTERS IS: ✔️A. .012" TO .014".
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