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Engine Diagnosis - Mechanical Chrysler Crossfire I final

Mechanical
CONDITIONPOSSIBLE CAUSESCORRECTION
NOISY VALVES1. High or low oil level in crankcase.1. Check and correct engine oil level.
2. Thin or diluted oil.2. Change oil to correct viscosity.
3. Thick oil3. (a.) Change oil and filter.
(b.) Run engine to operating temperature.
(c.) Change oil and filter again.
4. Low oil pressure.4. Check and correct engine oil level.
5. Dirt in tappets/lash adjusters.5. Replace rocker arm/adjuster assembly.
6. Worn rocker arms.6. Inspect oil supply to rocker arms.
7. Worn tappets/lash adjusters.7. Install new rocker arm/adjuster assembly.
8. Worn valve guides.8. Ream guides and install new valves with oversize stems.
9. Excessive runout of valve seats on valve faces.9. Grind valve seats and valves.
10. Missing adjuster pivot.10. Replace rocker arm/adjuster assembly.
CONNECTING ROD NOISE1. Insufficient oil supply.1. Check engine oil level.
2. Low oil pressure.2. Check engine oil level. Inspect oil pump.
3. Thin or diluted oil.3. Change oil to correct viscosity.
4. Thick oil4. (a.) Change oil and filter.
(b.) Run engine to operating temperature.
(c.) Change oil and filter again.
5. Excessive bearing clearance.5. Measure bearings for correct clearance. Repair as necessary.
6. Connecting rod journal out-of-round.6. Replace crankshaft or grind surface.
7. Misaligned connecting rods.7. Replace bent connecting rods.
MAIN BEARING NOISE1. Insufficient oil supply.1. Check engine oil level.
2. Low oil pressure.2. Check engine oil level. Inspect oil pump relief valve and spring.
3. Thin or diluted oil.3. Change oil to correct viscosity.
4. Thick oil4. (a.) Change oil and filter.
(b.) Run engine to operating temperature.
(c.) Change oil and filter again.
5. Excessive bearing clearance.5. Measure bearings for correct clearance. Repair as necessary.
6. Excessive end play.6. Check thrust bearing for wear on flanges.
7. Crankshaft journal out-of-round or worn.7. Replace crankshaft or grind journals.
8. Loose flywheel or torque converter.8. Tighten to correct torque.
OIL PRESSURE DROP1. Low oil level.1. Check engine oil level.
2. Faulty oil pressure sending unit.2. Install new sending unit.
3. Low oil pressure.3. Check sending unit and main bearing oil clearance.
4. Clogged oil filter.4. Install new oil filter.
5. Worn parts in oil pump.5. Replace oil pump.
6. Thin or diluted oil.6. Change oil to correct viscosity.
7. Oil pump relief valve stuck.7. Replace the oil pump.
8. Oil pump suction tube loose.8. Remove oil pan and install new tube or clean, if necessary.
9. Oil pump warped or cracked.9. Install new oil pump.
10. Excessive bearing clearance.10. Measure bearings for correct clearance.
OIL LEAKS1. Misaligned or deteriorated gaskets.1. Replace gasket(s).
2. Loose fastener, broken or porous metal part.2. Tighten, repair or replace the part.
3. Misaligned or deteriorated cup or threaded plug.3. Replace as necessary.
OIL CONSUMPTION OR SPARK PLUGS FOULED1. PCV system malfunction.1. Check system and repair as necessary.
2. Worn, scuffed or broken rings.2. Hone cylinder bores. Install new rings.
3. Carbon in oil ring slots.3. Clean pistons and install new rings.
4. Rings fitted too tightly in grooves.4. Remove rings and check grooves. If groove is not proper width, replace piston.
5. Worn valve guide(s).5. Replace cylinder head(s).
6. Valve stem seal(s) worn or damaged.6. Replace seal(s).

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