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Diagnosis And Testing: Mechanical

CONDITION POSSIBLE CAUSES CORRECTIONS
ENGINE NOISE 1. Worn accessory drive belt 1. Check for damage and/or alignment.
Refer to BELT, SERPENTINE, DIAGNOSIS AND TESTING .
2. Worn coolant pump 2. Check for possible coolant leak. If ok, Check the pulley and input shaft for wear. Replace as necessary.
3. Worn generator 3. Check the pulley for wear. Spin the armature. Replace as necessary.
4. Idler/Tensioner pulley 4. Check pulleys. Verify bearing noise. Replace as necessary.
5. Power steering pump 5. Check the pulley and input shaft for wear. Replace as necessary.
6. Flywheel/Flexplate 6. Check for wear or possible cracking. Check bolts. repair as necessary.
NOISY VALVES 1. High or low oil level in crankcase. 1. Refer to CAPACITIES AND RECOMMENDED FLUIDS, SPECIFICATIONS .
2. Thin or diluted oil. 2. Change oil and filter.
3. Low oil pressure. 3. Check oil pump, if Ok, check rod and main bearings for excessive wear.
4. Dirt in lash adjusters. 4. Replace as necessary.
5. Worn rocker arms. 5. Replace as necessary.
6. Worn lash adjusters 6. Replace as necessary.
7. Worn valve guides. 7. Replace cylinder head.
8. Excessive runout of valve seats on valve faces. 8. Refer to SEAL(S), VALVE GUIDE  .
CONNECTING ROD NOISE 1. Insufficient oil supply. 1. Refer to CAPACITIES AND RECOMMENDED FLUIDS, SPECIFICATIONS .
2. Low oil pressure. 2. Check oil pump, if Ok, check rod and main bearings for excessive wear.
3. Thin or diluted oil. 3. Change oil and filter.
4. Excessive bearing clearance. 4. Replace as necessary.
5. Connecting rod journal out-of-round. 5. Replace crankshaft.
6. Misaligned connecting rods. 6. Replace bent connecting rods.
MAIN BEARING NOISE 1. Insufficient oil supply. 1. Refer to CAPACITIES AND RECOMMENDED FLUIDS, SPECIFICATIONS .
2. Low oil pressure. 2. Check oil pump, if Ok, check rod and main bearings for excessive wear.
3. Thin or diluted oil. 3. Change oil and filter.
4. Excessive bearing clearance. 4. Replace as necessary.
5. Excessive end play. 5. Check thrust washers for wear.
6. Crankshaft journal out-of round. 6. Replace crankshaft.
7. Loose flywheel or torque converter. 7. Tighten to correct torque

Lifter Purge Guideline

  1. Warm engine to standard idle conditions.
    NOTE:

    Engine noise may be in the form of a clicking, chatter, or clattering noise.

  2. Listen to the engine for 30 to 60 seconds with the hood up and the engine cover removed.
  3. If noise is present, de-aeration of the lifters is required.
  4. Run the engine between 2000 and 3000 RPM for three to five minutes.
  5. Return the engine to standard idle speed for 30 to 60 seconds.
  6. Evaluate noise. If noise is present, repeat the run an additional 4 cycles.
    NOTE:

    The standard drive cycle will be about 10 - 15 miles of non- stop, combined highway and city driving.

  7. If noise is present, take the vehicle on a standard drive cycle.
    NOTE:

    Use a feeler gauge to verify clearance is present between the lifter and cam base circle.

  8. Evaluate the noise. If noise present, follow standard service procedure for lifter repairs or noise conditions.
  9. Evaluate lifters for sponginess, check valve defects, and clearance.
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