Dodge RAM TRUCK 1500 1995 Service Manual page 863

B R
ENGINES 9 -19
SERVICE DIAGNOSIS—DIESEL—MECHANICAL—CONT.
CONDITION
POSSIBLE CAUSES
CORRECTION
COMPRESSION KNOCKS
1 . Air in the fuel system.
2. Poor quality fuel or water/
gasoline contaminated fuel.
3. Engine overloaded.
4. Incorrect injection pump timing.
5. Improperly operating injectors.
1. Bleed the fuel system (refer to Group 14,
Fuel System).
2. Verify by operating from a temporary tank
with good fuel. Clean and flush the fuel
supply tanks. Replace fuel/water
separator filter.
3. Verify the engine load rating is not being
exceeded.
4. Check and time injection pump (refer to
Group 14, Fuel System).
5. Check and replace inoperative injectors.
EXCESSIVE VIBRATION
1. Loose or broken engine mounts.
2. Damaged fan or improperly
operating accessories.
3. Improperly operating vibration
damper.
4. Improperly operating viscous fan
drive.
5. Worn or damaged generator
bearing.
6. Flywheel housing misaligned.
7. Loose or broken power
component.
8. Worn or unbalanced driveline
components.
1. Replace engine mounts.
2. Check and replace the vibrating
components.
3. Inspect/replace the vibration damper.
4. Inspect/replace the fan drive.
5. Check/replace the generator.
6. Check/correct flywheel alignment.
7. Inspect the crankshaft and rods for
damage that causes an unbalance,
repair/replace as required.
8. Check/repair driveline components.
EXCESSIVE ENGINE
NOISES
1. Drive belt squeal, insufficient
tension or abnormally high
loading.
2. Intake air or exhaust leaks.
3. Excessive valve lash.
4. Turbocharger noise.
5. Gear train noise.
6. Power function knock.
1. Check the automatic tensioner and
inspect the drive belt. Make sure water
pump, tensioner pulley, fan hub and
generator turn freely.
2. Refer to Excessive Exhaust smoke
(Engine Diagnosis Performance).
3. Adjust valves. Make sure the push rods
are not bent and rocker levers or
adjusting screws are not severely worn.
Replace bent or severely worn pads.
4. Check turbocharger impeller and turbine
wheel for housing contact. Repair/replace
as required.
5. Visually inspect and measure gear
backlash. Replace gears as required.
6. Check/replace rod and main bearings.
GENERATOR NOT
CHARGING OR
INSUFFICIENT CHARGING
1 . Loose or corroded battery.
2. Generator belt slipping.
3. Generator pulley loose on shaft.
4. Improperly operating generator.
1. Clean/tighten battery connection.
2. Check/replace automatic belt tensioner.
Check/replace drive belt.
3. Tighten pulley.
4. Check/replace generator.
J9509-153