Dodge Ram Truck 1500-2500-3500. Manual — part 1375
ENGINE - 8.3L - SERVICE INFORMATION
DESCRIPTION
The engine is an 8.3 Liter (505 CID), 10-cylinder, 90°
V-type,
lightweight,
single-cam,
overhead
valve
engine. This engine is designed for premium unleaded
fuel.
The crankshaft is forged steel. The cylinder block and
cylinder heads are aluminum. The firing order is 1-10-
9-4-3-6-5-8-7-2. The cylinders are numbered from
front to rear as follows:
•
on the left bank - 1, 3, 5, 7, 9
•
on the right bank - 2, 4, 6, 8, 10
Vehicle Identification Number
This number (1) is located on the rear of the cylinder
block just below the right cylinder head.
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ENGINE - 8.3L - SERVICE INFORMATION
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Engine Serial Number
This number (2) is located on the lower right front of
the cylinder block near the oil pressure sensor.
DIAGNOSIS AND TESTING
INTRODUCTION
Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine main-
tenance.
These malfunctions may be classified as either mechanical (e.g., a strange noise), or performance (e.g., engine
idles rough and stalls).
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) - MECHANICAL and (Refer to 9 - ENGINE - DIAGNOSIS AND
TESTING) - PERFORMANCE for possible causes and corrections of malfunctions. Refer to the appropriate Diag-
nostic Information for fuel system diagnosis.
Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that cannot be iso-
lated with the Engine Diagnosis charts. Information concerning additional tests and diagnosis is provided within the
following:
•
Cylinder Compression Pressure Test
•
Cylinder Combustion Pressure Leakage Test
•
Cylinder Head Gasket Failure Diagnosis
•
Intake Manifold Leakage Diagnosis
•
Hydraulic Tappet Noise Diagnosis
•
Engine Oil Leak Inspection
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ENGINE - 8.3L - SERVICE INFORMATION
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ENGINE DIAGNOSIS - PERFORMANCE
CONDITION
POSSIBLE CAUSES
CORRECTION
ENGINE WILL NOT
CRANK
1. Weak or discharged battery.
1. Charge or replace battery as necessary.
(Refer to 8 - ELECTRICAL/BATTERY
SYSTEM - DIAGNOSIS AND TESTING).
Check charging system. Refer to the
appropriate Diagnostic Information for
charging system diagnosis.
2. Corroded or loose battery
connections.
2. Clean/tighten battery/starter connections.
3. Faulty starter or related circuits.
3. Check starting system. (Refer to 8 -
ELECTRICAL/STARTING - DIAGNOSIS
AND TESTING).
4. Seized accessory drive
component.
4. Remove accessory drive belt and
attempt to start engine. If engine cranks,
repair/replace seized component.
5. Engine internal mechanical failure
or hydrostatic lock.
5. (Refer to 9 - ENGINE - STANDARD
PROCEDURE - HYDROSTATIC LOCKED
ENGINE).
ENGINE CRANKS BUT
WILL NOT START
1. No spark.
1. Check for spark. Refer to the appropriate
Diagnostic Information for ignition system
diagnosis.
2. No fuel.
2. Perform fuel pressure test. Refer to the
appropriate Diagnostic Information for fuel
system diagnosis.
3. Low or no engine compression.
3. Perform cylinder compression test.
(Refer to 9 - ENGINE - DIAGNOSIS AND
TESTING - CYLINDER COMPRESSION
PRESSURE TEST).
ENGINE LOSS OF
POWER
1. Worn or incorrect gapped spark
plugs.
1. Replace spark plugs or set gap.
2. Dirt or water in fuel system.
2. Clean system and replace fuel filter.
3. Faulty fuel pump.
3. Replace fuel pump.
4. Incorrect valve timing.
4. Correct valve timing.
5. Blown cylinder head gasket(s).
5. Replace cylinder head gasket(s).
6. Low compression.
6. Test cylinder compression. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING -
CYLINDER COMPRESSION PRESSURE
TEST)
7. Burned, warped, or pitted valves.
7. Install new or reface valves as
necessary.
8. Plugged or restricted exhaust.
8. Replace parts as necessary.
9. Faulty ignition cables.
9. Replace ignition cables as necessary.
10. Faulty coil(s).
10. Test and replace as necessary.
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ENGINE - 8.3L - SERVICE INFORMATION
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CONDITION
POSSIBLE CAUSES
CORRECTION
ENGINE STALLS OR
ROUGH IDLE
1. Carbon buildup on throttle plate.
1. Remove throttle body and de-carbon.
2. Engine idle speed too low.
2. Check Idle Air Control circuit. Refer to
the appropriate Diagnostic Information for
IAC motor testing.
3. Worn or incorrectly gapped spark
plugs.
3. Replace spark plugs or set gap.
4. Faulty or crossed ignition cables.
4. Check for correct firing order or replace
ignition cables as necessary.
5. Faulty coil(s).
5. Test and replace as necessary.
6. Intake manifold vacuum leak.
6. Inspect intake manifold gasket and
vacuum hoses. Replace as necessary.
ENGINE MISSES ON
ACCELERATION
1. Worn or incorrectly gapped spark
plugs.
1. Replace spark plugs or set gap.
2. Faulty ignition cables.
2. Replace ignition cables as necessary.
3. Dirt or water in fuel system.
3. Clean system and replace fuel filter.
4. Burned, warped, or pitted valves.
4. Install new or reface valves as
necessary.
5. Faulty coil(s).
5. Test and replace as necessary.
ENGINE DIAGNOSIS - MECHANICAL
CONDITION
POSSIBLE CAUSES
CORRECTION
NOISY VALVES
1. High or low oil level in crankcase.
1. Check for correct oil level. Adjust oil level
by draining or adding as needed.
2. Thin or diluted oil.
2. Change oil and filter.
3. Low oil pressure.
3. Check engine oil level. If OK, perform oil
pressure test. (Refer to 9 - ENGINE/
LUBRICATION - DIAGNOSIS AND
TESTING).
4. Dirt in tappets/lash adjusters.
4. Clean/replace hydraulic tappets/lash
adjusters.
5. Bent push rod(s).
5. Replace push rod(s) as necessary.
6. Worn rocker arms.
6. Replace worn rocker arms and inspect
oil supply to rocker arms.
7. Worn tappets/lash adjusters.
7. Replace hydraulic tappets/hydraulic lash
adjusters.
8. Worn valve guides.
8. Ream and install new valves with
oversize stems.
9. Excessive runout of valve seats
on valve faces.
9. Grind valve seats and valves.
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