Dodge 2001 Ram 1500 Owner's Manual page 1153

9 - 6 ENGINE 3.9L
ENGINE 3.9L (Continued)
DIAGNOSIS AND TESTING— MECHANICAL
CONDITION
NOISY VALVES/LIFTERS
CONNECTING ROD
NOISE
MAIN BEARING NOISE
ENGINE MECHANICAL DIAGNOSIS CHART
POSSIBLE CAUSES
1. High or low oil level in crankcase
2. Thin or diluted oil
3. Low oil pressure
4. Dirt in tappets/lash adjusters
5. Bent push rod(s)
6. Worn rocker arms
7. Worn tappets/lash adjusters
8. Worn valve guides
9. Excessive runout of valve seats or
valve faces
1. Insufficient oil supply
2. Low oil pressure
3. Thin or diluted oil
4. Excessive connecting rod 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
CORRECTION
1. Check for correct oil level. Adjust oil
level by draining or adding as needed
2. Change oil. (Refer to 9 - ENGINE/
LUBRICATION/OIL - STANDARD
PROCEDURE)
3. Check engine oil level. If ok, Perform
oil pressure test. (Refer to 9 - ENGINE/
LUBRICATION - DIAGNOSIS AND
TESTING) for engine oil pressure
test/specifications
4. Clean/replace hydraulic tappets/lash
adjusters
5. Install new push rods
6. Inspect oil supply to rocker arms and
replace worn arms as needed
7. Install new hydraulic tappets/lash
adjusters
8. Inspect all valve guides and replace as
necessary
9. Grind valves and seats
1. Check engine oil level.
2. Check engine oil level. If ok, Perform
oil pressure test. (Refer to 9 - ENGINE/
LUBRICATION - DIAGNOSIS AND
TESTING) engine oil pressure test/
specifications
3. Change oil to correct viscosity. (Refer
to 9 - ENGINE/LUBRICATION/OIL -
STANDARD PROCEDURE) for correct
procedure/engine oil specifications
Measure bearings for correct clearance
with plasti-gage. Repair as necessary
5. Replace crankshaft or grind journals
6. Replace bent connecting rods
1. Check engine oil level.
2. Check engine oil level. If ok, Perform
oil pressure test. (Refer to 9 - ENGINE/
LUBRICATION - DIAGNOSIS AND
TESTING)
3. Change oil to correct viscosity.
BR/BE