Chrysler New Yorker. Manual - part 204
CONDITION
POSSIBLE CAUSE
CORRECTION
ENGINE MISSES AT
HIGH SPEED
1. Dirty or incorrect spark plug gap.
1. Clean spark plugs and set gap. Refer to
Group 8D, Ignition System.
2. Faulty coil(s).
2. Test and replace as necessary. Refer to
Group 8D, Ignition System.
3. Dirty fuel injector(s).
Test and replace as necessary. Refer to
Group 14, Fuel System.
4. Contamination in fuel system.
4. Clean system and replace fuel filter.
ENGINE DIAGNOSIS—MECHANICAL
CONDITION
POSSIBLE CAUSES
CORRECTION
NOISY VALVES
1. High or low oil level in crankcase.
1. Check for correct oil level.
2. Thin or diluted oil.
2. Change oil to correct viscosity.
3. Low oil pressure.
3. Check engine oil level.
4. Dirt in tappets/lash adjusters.
4. Replace rocker arm/hydraulic lash
adjuster assembly.
5. Worn rocker arms.
5. Inspect oil supply to rocker arms.
6. Worn tappets/lash adjusters.
6. Install new rocker arm/hydraulic lash
adjuster assembly.
7. Worn valve guides.
7. Ream and install new valves with
oversize stems.
8. Excessive runout of valve seats on
valve faces.
8. Grind valve seats and valves.
9. Missing adjuster pivot.
9. Replace rocker arm/hydraulic lash
adjuster assembly.
CONNECTING ROD
NOISE
1. Insuffient 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. Excessive bearing clearance.
4. Measure bearings for correct clearance.
Repair as necessary.
5. Connecting rod journal out-of-round.
5. Replace crankshaft or grind surface.
6. Misaligned connecting rods.
6. Replace bent connecting rods.
MAIN BEARING NOISE
1. 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. Excessive bearing clearance.
4. Measure bearings for correct clearance.
Repair as necessary.
5. Excessive end play.
5. Check thrust bearing for wear on
flanges.
6. Crankshaft journal out-of-round or worn.
6. Replace crankshaft or grind journals.
7. Loose flywheel or torque converter.
7. Tighten to correct torque.
LH
ENGINE
9 - 11
DIAGNOSIS AND TESTING (Continued)