Chrysler Sebring 2004 Service Manual page 1075

9 - 148 ENGINE 2.7L DOHC
ENGINE 2.7L DOHC (Continued)
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - MECHANICAL
CONDITION
NOISY VALVES
CONNECTING ROD NOISE
MAIN BEARING NOISE
POSSIBLE CAUSES
1. High or low oil level in crankcase.
2. Thin or diluted oil.
3. Thick oil
4. Low oil pressure.
5. Dirt in tappets/lash adjusters.
6. Worn rocker arms.
7. Worn tappets/lash adjusters.
8. Worn valve guides.
9. Excessive runout of valve seats on
valve faces.
10. Missing adjuster pivot.
1. Insufficient oil supply.
2. Low oil pressure.
3. Thin or diluted oil.
4. Thick oil
5. Excessive bearing clearance.
6. Connecting rod journal out-of-round.
7. Misaligned connecting rods.
1. Insufficient oil supply.
2. Low oil pressure.
3. Thin or diluted oil.
4. Thick oil
4. Excessive bearing clearance.
5. Excessive end play.
6. Crankshaft journal out-of-round or
worn.
7. Loose flywheel or torque converter.
CORRECTION
1. Check and correct engine oil level.
2. Change oil to correct viscosity.
3. (a.) Change oil and filter.
(b.) Run engine to operating temperature.
(c.) Change oil and filter again.
4. Check and correct engine oil level.
5. Replace rocker arm/hydraulic lash
adjuster assembly.
6. Inspect oil supply to rocker arms.
7. Install new rocker arm/hydraulic lash
adjuster assembly.
8. Ream guides and install new valves
with oversize stems.
9. Grind valve seats and valves.
10. Replace rocker arm/hydraulic lash
adjuster assembly.
1. Check engine oil level.
2. Check engine oil level. Inspect oil
pump relief valve and spring.
3. Change oil to correct viscosity.
3. (a.) Change oil and filter.
(b.) Run engine to operating temperature.
(c.) Change oil and filter again.
5. Measure bearings for correct
clearance. Repair as necessary.
6. Replace crankshaft or grind surface.
7. Replace bent connecting rods.
1. Check engine oil level.
2. Check engine oil level. Inspect oil
pump relief valve and spring.
3. Change oil to correct viscosity.
3. (a.) Change oil and filter.
(b.) Run engine to operating temperature.
(c.) Change oil and filter again.
4. Measure bearings for correct
clearance. Repair as necessary.
5. Check thrust bearing for wear on
flanges.
6. Replace crankshaft or grind journals.
7. Tighten to correct torque.
JR