Dodge RAM TRUCK 1500 1995 Service Manual page 853

BR
ENGINES 9 - 9
ENGINE DIAGNOSIS—GASOLINE—MECHANICAL
CONDITION P O S S I B L E C A U S E S CORRECTION
NOISY VALVES
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 rods.
6. Worn rocker arms.
7. Worn tappets/lash adjusters.
8. Worn valve guides.
9. Excessive runout of valve seats
on valve faces.
1. Check for correct oil level (refer to
Group 0, Lubrication and Maintenance.
2. Change oil (refer to Group 0,
Lubrication and Maintenance).
3. Check engine oil level.
4. Clean hydraulic tappets/hydraulic
lash adjusters.
5. Install new push rods.
6. Inspect oil supply to rocker arms.
7. Install new hydraulic tappets/
hydraulic lash adjusters.
8. Ream and install new valves with
oversize stems.
9. Grind valve seats and valves.
CONNECTING ROD NOISE 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. Check engine oil level (refer to
Group 0, Lubrication and Maintenance).
2. Check engine oil level. Inspect oil
pump relief valve and spring.
3. Change oil to correct viscosity.
4. Measure bearings for correct
clearance. Repair as necessary.
5. Replace crankshaft or grind journals.
6. Replace bent connecting rods.
MAIN BEARING NOISE 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,
worn.
7. Loose flywheel or torque converter.
1. Check engine oil level (refer to
. Group 0, Lubrication and Maintenance).
2. Check engine oil level. Inspect oil
pump relief valve and spring.
3. Change oil to correct viscosity.
4. Measure bearings for correct
clearance. Repair as necessary.
5. Check No. 3 main bearing for wear
on flanges.
6. Grind journals or replace crankshaft.
7. Tighten to correct torque.
J9509-62