Chrysler Dodge Caravan 2002 Manual page 1207

9 - 6 ENGINE 2.4L
ENGINE 2.4L (Continued)
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - MECHANICAL
CONDITION
NOISY VALVES
CONNECTING ROD 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 hydraulic lifters/lash
adjusters.
6. Worn rocker arms.
7. Worn hydraulic lifters/lash
adjusters.
8. Worn valve guides.
9. Excessive runout of valve seats
on valve faces.
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.
CORRECTION
1. Check and correct engine oil
level.
2. Change oil to correct viscosity.
3. (a) Change engine oil and filter.
(b) Run engine to operating
temperature.
(c) Change engine oil and filter
again.
4. Check and correct engine oil
pressure problem.
5. Replace hydraulic lifters/lash
adjusters.
6. Inspect oil supply to rocker arms.
7. Replace hydraulic lifters/lash
adjusters.
8. Replace cylinder head assembly.
9. Grind valve seats and valves.
1. Check engine oil level.
2. Check engine oil level. Inspect oil
pump relief valve and spring.
3. Change oil to correct viscosity.
4. (a) Change engine oil and filter.
(b) Run engine to operating
temperature.
(c) Change engine oil and filter
again.
5. Measure bearings for correct
clearance. Repair as necessary.
6. Replace crankshaft or grind
surface.
7. Replace bent connecting rods.
RS