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Diagnosis - Mechanical

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSIS - MECHANICAL

CONDITION POSSIBLE CAUSE CORRECTIONS
NOISY VALVES
  1. High or low oil level in crankcase.
  2. Thin or diluted oil.
  3. Low oil pressure.
  4. Dirt in lash adjusters.
  5. Worn rocker arms.
  6. Worn lash adjusters
  7. Worn valve guides.
  8. Excessive runout of valve seats on valve faces.
  1. (Refer to STANDARD PROCEDURE - ENGINE OIL SERVICE  )
  2. Change oil and filter.
  3. Check oil pump, if Ok, check rod and main bearings for excessive wear.
  4. Replace as necessary.
  5. Replace as necessary.
  6. Replace as necessary.
  7. (Refer to STANDARD PROCEDURE - REFACING  )
  8. (Refer to STANDARD PROCEDURE - REFACING  )
CONNECTING ROD NOISE
  1. Insufficient oil supply.
  2. Low oil pressure.
  3. Thin or diluted oil.
  4. Excessive bearing clearance.
  5. Connecting rod journal out-of-round.
  6. Misaligned connecting rods.
  1. (Refer to STANDARD PROCEDURE - ENGINE OIL SERVICESTANDARD PROCEDURE  )
  2. Check oil pump, if Ok, check rod and main bearings for excessive wear.
  3. Change oil and filter.
  4. Replace as necessary.
  5. Service or replace crankshaft.
  6. Replace bent connecting rods.
MAIN BEARING NOISE
  1. Insufficient oil supply.
  2. Low oil pressure.
  3. Thin or diluted oil.
  4. Excessive bearing clearance.
  5. Excessive end play.
  6. Crankshaft journal out-of round.
  7. Loose flywheel or torque converter.
  1. (Refer to STANDARD PROCEDURE - ENGINE OIL SERVICESTANDARD PROCEDURE  )
  2. Check oil pump, if Ok, check rod and main bearings for excessive wear.
  3. Change oil and filter.
  4. Replace as necessary.
  5. Check thrust washers for wear.
  6. Service or replace crankshaft.
  7. Tighten to correct torque
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