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Engine Repair Mechanic Exam 2025/2026 – 90+ Expert-Verified Questions & Answers | Valves, Compression, Camshaft, Diagnostics, Plastigage

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This detailed study guide contains 90+ expert-verified exam questions and answers tailored to the Michigan Mechanic Certification for Engine Repair, updated for the 2025/2026 test cycle. Structured to mirror the actual certification format, this document is designed for automotive professionals, vocational students, and certified technicians aiming to pass the State of Michigan Mechanic License Test – Engine Repair category. The guide explores a wide range of engine systems, diagnostic tools, and repair procedures, including: Valve & Camshaft Systems: tappet clearance adjustment, valve spring measurement, hydraulic lifter diagnostics, valve margin refacing Compression & Leak Testing: interpretation of PSI readings, causes of low compression, cylinder leakage analysis Crankshaft & Bearings: use of Plastigage, crankshaft endplay, bearing insert evaluations, rod journal taper and out-of-round issues Micrometers & Measuring Tools: interpreting readings, bore gauge usage, determining ring end gap, piston fit and wear limits Cooling & Lubrication Systems: causes of low oil pressure, bubbles in coolant, bearing clearances, oil consumption causes Engine Assembly Procedures: piston installation, honing techniques, camshaft bearing installation, engine break-in best practices Diagnostics & Symptoms: sludge buildup, turbocharger failure causes, crankcase blow-by, vacuum gauge readings Engine Component Matching: interchangeable pistons, pushrod and camshaft replacement criteria, break-in procedures Ideal for: Automotive students in vocational and technical colleges Mechanics preparing for Michigan State Certification in Engine Repair ASE-certified professionals cross-training in state licensing requirements Educators and trainers in engine performance and repair courses This guide ensures technical confidence in mechanical principles and field diagnostics, equipping users with knowledge required to pass the exam and perform real-world engine diagnostics and repair at a professional level. Keywords: engine repair exam, Michigan mechanic license, tappet clearance, camshaft diagnostics, compression test, valve spring measurement, Plastigage readings, crankshaft endplay, micrometer use, cylinder honing, piston ring gap, vacuum gauge engine, oil pressure diagnosis, engine assembly, turbo failure causes, auto repair certification, automotive measuring tools, sludge buildup, Michigan auto technician test

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Institution
Engine Repair
Course
Engine repair

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ENGINE REPAIR MICHIGAN MECHANIC
STUDY GUIDE 2025 EXPERT VERIFIED |
ACE THE TEST



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.




COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED

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