AUT 112W - Engine Service

1. Diagnose General Engine; Removal and Reinstallation (R&R). Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.
   1. Identify and interpret engine concern; determine necessary action. P-1
   2. Research applicable vehicle and service information, such as internal engine operation, vehicle service history, service precautions, and technical service bulletins. P-1
   3. Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, and calibration decals). P-1
   4. Inspect engine assembly for fuel, oil, coolant, and other leaks; determine necessary action. P-1
   5. Diagnose engine noises and vibrations; determine necessary action. P-2
   6. Diagnose the cause of excessive oil consumption, unusual engine exhaust color, odor, and sound; determine necessary action. P-2
   7. Perform engine vacuum tests; determine necessary action. P-1
   8. Perform cylinder power balance tests; determine necessary action. P-1
   9. Perform cylinder compression tests; determine necessary action. P-1
   10. Perform cylinder leakage tests; determine necessary action. P-1
   11. Remove and reinstall engine in a late model front-wheel drive vehicle (OBDI or newer); reconnect all attaching components and restore the vehicle to running condition. P-1
   12. Remove and reinstall engine in a late model rear-wheel drive vehicle (OBDI or newer); reconnect all attaching components and restore the vehicle to running condition. P-3
2. Diagnose and repair cylinder head and valve train. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.
   1. Remove cylinder head(s); visually inspect cylinder head(s) for cracks; check gasket surface areas for warpage and leakage; check passage condition. P-2
   2. Install cylinder heads and gaskets; tighten according to manufacturer's specifications and procedures. P-1
   3. Inspect valve springs for squareness and free height comparison; determine necessary action. P-2
   4. Replace valve stem seals on an assembled engine; inspect valve spring retainers, locks, and valve grooves; determine necessary action. P-2
   5. Inspect valve guides for wear; check valve stem-to-guide clearance; determine necessary action. P-3
   6. Inspect valves and valve seats; determine necessary action. P-3
   7. Check valve face-to-seat contact and valve seat concentricity (runout); determine necessary action. P-3
   8. Check valve spring assembled height and valve stem height; determine necessary action. P-3
   9. Inspect pushrods, rocker arms, rocker arm pivots and shafts for wear, bending, cracks, looseness, and blocked oil passages (orifices); determine necessary action. P-2
   10. Inspect hydraulic or mechanical lifters; determine necessary action. P-2
   11. Adjust valves (mechanical or hydraulic lifters). P-1
   12. Inspect camshaft drives (including gear wear and backlash, sprocket and chain wear); determine necessary action. P-2
   13. Inspect and replace timing belts (chains), overhead camdrive sprockets, and tensioners; check belt/chain tension; adjust as necessary. P-1
   14. Inspect camshaft for runout, journal wear and lobe wear. P-2
   15. Inspect camshaft bearing surface for wear, damage, out-of-round, and alignment; determine necessary action. P-3
   16. Establish camshaft(s) timing and cam sensor indexing according to manufacturer’s specifications and procedures. P-1
3. Diagnose and repair engine block assembly. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.
   1. Disassemble engine block; clean and prepare components for inspection and reassembly. P-2
   2. Inspect engine block for visible cracks, passage condition, core and gallery plug condition, and surface warpage; determine necessary action. P-2
   3. Inspect internal and external threads; restore as needed (includes installing thread inserts). P-2
   4. Inspect and measure cylinder walls for damage, wear, and ridges; determine