Chrysler PT Cruiser Service & Repair Manual page 1098

9 - 78 ENGINE 2.0L DOHC
ENGINE 2.0L DOHC (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 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.
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
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.
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.
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