Engine Mechanical Diagnostic Table

WARNING: This page is about a different variant/trim than selected.

CONDITION	POSSIBLE CAUSES	CORRECTIONS
NOISY VALVES	1. High or low oil level in crankcase.	1. Refer to OIL, STANDARD PROCEDURE .
	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 the cylinder head. Refer to CYLINDER HEAD, REMOVAL AND INSTALLATION .
CONNECTING ROD NOISE	1. Insufficient oil supply	1. Refer to OIL, STANDARD PROCEDURE .
	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 the engine.
	5. Misaligned or bent connecting rods	5. Replace the engine.
MAIN BEARING NOISE	1. Insufficient oil supply	1. Refer to OIL, STANDARD PROCEDURE .
	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 crankshaft end play	4. Replace the engine.
	5. Loose flywheel or torque converter	5. Tighten to correct torque.