Dodge dakota 2002 Service Manual page 1255

9 - 6 ENGINE - 3.7L
ENGINE - 3.7L (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. Low oil pressure.
4. Dirt in lash adjusters.
5. Worn rocker arms.
6. Worn lash adjusters
7. Worn valve guides.
8. Excessive runout of valve seats
on valve faces.
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.
7. Loose flywheel or torque
converter.
CORRECTIONS
1. (Refer to LUBRICATION &
MAINTENANCE -
SPECIFICATIONS)
2. Change oil and filter.
3. Check oil pump, if Ok, check rod
and main bearings for excessive
wear.
4. Replace as necessary.
5. Replace as necessary.
6. Replace as necessary.
7. (Refer to 9 - ENGINE/CYLINDER
HEAD/INTAKE/EXHAUST VALVES
& SEATS - STANDARD
PROCEDURE)
8. (Refer to 9 - ENGINE/CYLINDER
HEAD/INTAKE/EXHAUST VALVES
& SEATS - STANDARD
PROCEDURE)
1. (Refer to LUBRICATION &
MAINTENANCE -
SPECIFICATIONS)
2. Check oil pump, if Ok, check rod
and main bearings for excessive
wear.
3. Change oil and filter.
4. Replace as necessary.
5. Service or replace crankshaft.
6. Replace bent connecting rods.
1. (Refer to LUBRICATION &
MAINTENANCE -
SPECIFICATIONS)
2. Check oil pump, if Ok, check rod
and main bearings for excessive
wear.
3. Change oil and filter.
4. Replace as necessary.
5. Check thrust washers for wear.
6. Service or replace crankshaft.
7. Tighten to correct torque
DR