Chrysler Stratus RHD 1997 Interactive Electronic Service Manual page 848

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DIAGNOSIS AND TESTING (Continued)
ENGINE DIAGNOSIS—MECHANICAL
CONDITION
NOISY VALVES
CONNECTING ROD NOISE
MAIN BEARING NOISE
OIL PRESSURE DROP
OIL LEAKS
OIL CONSUMPTION OR
SPARK PLUGS OIL FOULED
POSSIBLE CAUSES
1. High or low oil level in crankcase.
2. Thin or diluted oil.
3. Low oil pressure.
4. Dirt in tappets/lash adjsuters.
5. Worn rocker arms.
6. Worn tappets/lash adjusters.
7. Worn valve guides.
8. Excessive runout of valve seats.
9. Missing adjuster pivot.
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. 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, worn.
7. Loose flywheel or torque
converter.
1. Low oil level.
2. Faulty oil pressure sending unit.
3. Low oil pressure.
4. Clogged oil filter.
5. Worn parts in oil pump.
6. Thin or diluted oil.
7. Excessive bearing clearance.
8. Oil pump relief valve stuck.
9. Oil pump suction tube loose, bent
cracked, or blocked.
10. Oil pump cover warped or
cracked.
1. Misaligned or deteriorated gaskets.
2. Loose fastener, broken or porous
metal part.
3. Misaligned or deteriorated cup or
threaded plug.
1. PCV system malfunction.
2. Worn, scuffed or broken rings.
3. Carbon in oil ring slot.
4. Rings fitted too tightly in grooves.
5. Worn valve guides.
6. Valve stem unseated or defective.
CORRECTION
1. Checkfor correct oil level (refer to Group 0, Lubrication and
Maintenance).
2. Change oil (refer to Group 0, Lubrication and Maintenance.
3. Check engine oil level.
4. Replace rocker arm/hydraulic lash adjuster assembly.
5. Inspect oil supply to rocker arms.
6. Install new rocker arm/hydraulic lash adjuster assembly.
7. Ream and install new valves with oversize stems.
8. Grind valve seats and valves.
9. Replace rocker arm/hydraulic lash adjuster assembly.
1. Check engine oil level (refer to Group 0, Lubrication and
Maintenance.
2. Check engine oil level. Inspect oil pump relief valve and
spring.
3. Change oil to correct viscosity.
4. Measure bearings for correct clearance. Repair as necessary.
5. Replace crankshaft or grind journals.
6. Replace bent connecting rods.
1. Check engine oil level (refer to Group 0, Lubrication and
Maintenance).
2. Check engine oil level. Inspect oil pump relief valve.
3. Change oil to correct viscosity.
4. Measure bearings for correct clearance. Repair as
necessary.
5. Check thrust bearing for wear on flanges.
6. Grind journals or replace crankshaft.
7. Tighten to correct torque.
1. Check engine oil level.
2. Install new sending unit.
3. Check sending unit and check main bearing oil clearance.
4. Install new oil filter.
5. Replace worn parts or pump.
6. Change oil to correct viscosity.
7. Measure bearings for correct clearance.
8. Remove valve and inpsect, clean and install.
9. Remove oil pan and install new tube, or clean if necessary.
10. Install new oil pump.
1. Replace the gasket.
2. Tighten, repair or replace the part.
3. Replace.
1. Check system. Clean and repair, as necessary (refer to
Group 25, Emissions Control System).
2. Hone cylinder bores. Install new rings.
3. Install new rings.
4. Remove the rings. Check grooves. If groove is not proper
width, replace piston.
5. Ream guides and replace valves with oversize valves and
seals.
6. Repair or replace seal.
ENGINE 9 - 11