AGM 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. Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, and calibration decals).  P-1
   2. Inspect engine assembly for fuel, oil, coolant, and other leaks; determine  necessary action. P-1
   3. Diagnose engine noises and vibrations; determine necessary action.  P-2
   4. Diagnose the cause of excessive oil consumption, unusual engine exhaust color, odor, and sound; determine necessary action.  P-2
   5. Perform engine vacuum tests; determine necessary action.  P-1
   6. Perform cylinder power balance tests; determine necessary action.  P-1
   7. Perform cylinder compression tests; determine necessary action.  P-1
   8. Perform cylinder leakage tests; determine necessary action.  P-1
   9. 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
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 necessary action.  P-2
   5. Deglaze and clean cylinder walls.  P-2
   6. Inspect and measure camshaft bearings for wear, damage, out-of-round, and alignment; determine necessary action.  P-3
   7. Inspect crankshaft for end play, straightness, journal damage, keyway damage, thrust flange and sealing surface condition, and visual surface cracks; check oil passage condition; measure journal wear; check crankshaft sensor reluctor ring (where applicable); determine  necessary action.  P-2
   8. Inspect and measure main and connecting rod bearings for damage, clearance, and end play; determine necessary action (includes the proper selection of bearings).  P-2
   9. Identify piston and bearing wear patterns that indicate connecting rod alignment and main bearing bore problems; inspect rod alignment and bearing bore condition.  P-3
   10. Inspect and measure pistons; determine necessary action.  P-2
   11. Remove and replace piston pin.  P-3
   12. Inspect, measure, and install piston rings.  P-1
   13. Inspect auxiliary (balance, intermediate, idler, counterbalance or silencer) shaft(s); inspect shaft(s) and support bearings for damage and wear; determine necessary action; reinstall and time.  P-2
   14. Inspect or replace crankshaft vibration damper (harmonic balancer).  P-3
   15. Assemble the engine using gaskets, seals, and formed-in-place (tube-applied) sealants, thread sealers, etc. according to manufacturer’s specifications.  P-2
4. Diagnose and repair lubrication and cooling systems. Complete 95% of Priority 1, 80% of Priority 2, and 50% of Priority 3 NATEF tasks as listed below.
   1. Perform oil pressure tests; determine necessary action.  P-1
   2. Inspect oil pump gears or rotors, housing, pressure relief devices, and pump drive; perform  necessary action.  P-2
   3. Perform cooling system, cap, and recovery system tests (pressure, combustion leakage, and temperature); determine necessary action.  P-1
   4. Inspect, test, and replace thermostat and housing.  P-2
   5. Inspect, test, remove, and replace water pump.  P-1
   6. Inspect, test, and replace oil temperature and pressure switches and sensors.  P-2