1998 DODGE RAM 1500 Engine firing

SPECIFICATIONS
SPECIFICATIONS - 4.7L ENGINE
GENERAL DESCRIPTION
DESCRIPTION SPECIFICATION
Engine Type 90É SOHC V-8 16-Valve
Displacement 4.7 Liters / 4701 cc
287 ( Cubic Inches)
Bore 93.0 mm (3.66 in.)
Stroke 86.5 mm (3.40 in.)
Compression Ratio 9.0:1
Horsepower 235 BHP @ 4800 RPM
Torque 295 LB-FT @ 3200 RPM
Lead Cylinder #1 Left Bank
Firing Order 1-8-4-3-6-5-7-2
CYLINDER BLOCK
DESCRIPTION SPECIFICATION
Metric Standard
Bore Diameter 93.010   .0075
mm3.6619   0.0003
in.
Out of Round
(MAX)0.076 mm 0.003 in.
Taper (MAX) 0.051 mm 0.002 in.
PISTONS
DESCRIPTION SPECIFICATION
Metric Standard
Diameter 92.975 mm 3.6605 in.
Weight 366 grams 12.9 oz
Ring Groove
Diameter
No. 1 83.37 - 83.13
mm3.282 - 3.273 in
No. 2 82.833 - 83.033
mm3.261 - 3.310 in.
No. 3 83.88 - 84.08
mm3.302 - 3.310 in.
PISTON PINS
DESCRIPTION SPECIFICATION
Metric Standard
Clearance In
Piston0.010 - 0.019
mm0.0004 - 0.0008
in.
Diameter 24.013 - 24.016
mm0.9454 - 0.9455
in.
PISTON RINGS
DESCRIPTION SPECIFICATION
Metric Standard
Ring Gap
To p
Compression
Ring0.20 - 0.36 mm 0.0079 - 0.0142
in.
Second
Compression
Ring0.37 - 0.63 mm 0.0146 - 0.0249
in.
Oil Control
(Steel Rails)0.25 - 0.76 mm 0.0099 - 0.30 in.
Side Clearance
To p
Compression
Ring.051 - .094 mm 0.0020 - 0.0037
in.
Second
Compression
Ring0.040 - 0.080
mm0.0016 - 0.0031
in.
Oil Ring (Steel
Ring).019 - .229 mm .0007 - .0091 in.
Ring Width
To p
Compression
Ring1.472 - 1.490
mm0.057 - 0.058 in.
Second
Compression
Ring1.472 - 1.490
mm0.057 - 0.058 in.
Oil Ring (Steel
Rails)0.445 - 0.470
mm0.017 - 0.018 in.
DRENGINE - 4.7L 9 - 99
ENGINE - 4.7L (Continued)

ENGINE - 5.7L
DESCRIPTION
The 5.7L engine (Fig. 1)(345 CID) eight-cylinder
engine is a 90É V-Type lightweight, deep skirt cast
iron block, aluminum heads, single cam, overhead
valve engine with hydraulic roller tappets. The heads
incorporate splayed valves with a hemispherical style
combustion chamber and dual spark plugs. The cyl-
inders are numbered from front to rear; 1, 3, 5, 7 on
the left bank and 2, 4, 6, 8 on the right bank. The
firing order is 1-8-4-3-6-5-7-2.
Fig. 1 5.7L ENGINE
9 - 182 ENGINE - 5.7LDR

(31)Install the air cleaner resonator and duct work..
(32) Add engine oil to crankcase (Refer to LUBRI-
CATION & MAINTENANCE/FLUID TYPES - SPEC-
IFICATIONS).
(33) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(34) Connect battery negative cable.
(35) Start engine and inspect for leaks.
(36) Road test vehicle.
SPECIFICATIONS
5.7L ENGINE
GENERAL DESCRIPTION
DESCRIPTION SPECIFICATION
Engine Type 90É V-8 OHV
Displacement 5.7 Liters
345 ( Cubic Inches)
Bore 99.5 mm (3.91 in.)
Stroke 90.9 mm (3.58 in.)
Compression Ratio 9.6:1
Firing Order 1-8-4-3-6-5-7-2
Lubrication Pressure Feed - Full
Flow
Filtration
Cooling System Liquid Cooled - Forced
Circulation
Cylinder Block Cast Iron
Cylinder Head Aluminum
Crankshaft Nodular Iron
Camshaft Hollow Assembled
Camshaft
Pistons Aluminum Alloy
Connecting Rods Powdered Metal
CYLINDER BLOCK
DESCRIPTION SPECIFICATION
Metric Standard
Cylinder Bore
Diameter99.50 mm 3.917 in.
Out of Round
(MAX)0.0076 mm 0003 in.
Taper (MAX) 0.0127 mm 0.0005 in.
Lifter Bore
Diameter21.45 - 21.425
mm0.8444 - 0.8435
in.
PISTONS
DESCRIPTION SPECIFICATION
Metric Standard
Clearance at
Top of Skirt0.0215 - 0.0485
mm0.0008 - 0.0019
in.
Measured at
45.0 mm ( 1.77
in.) Below Deck
Land Clearance
Diameter
Groove #1 0.6715 - 0.7105
mm0.0264 - 0.0279
in.
Groove #2 0.5455 - 0.6245
mm0.0214 - 0.0245
in.
Weight 413 grams 14.56 oz
Piston Length 54.70 - 55.30 2.153 - 2.177 in.
Ring Groove
Width
No. 1 1.51 - 1.54 mm 0.0594 - 0.0606
in
No. 2 1.51 - 1.53 mm 0.0594 - 0.0602
in.
No. 3 3.030 - 3.055
mm0.1192 - 0.1202
in.
PISTON PINS
DESCRIPTION SPECIFICATION
Metric Standard
Clearance In
Piston0.009 - 0.018
mm0.00035 -
0.0007 in.
Diameter 24.0 - 24.003
mm0.9448 - 0.9449
in.
Length 70.53 - 71.03
mm2.78 - 2.80 in.
9 - 192 ENGINE - 5.7LDR
ENGINE - 5.7L (Continued)

þ Loss of engine power
þ Engine misfiring
þ Poor fuel economy
²Possible indications of the cylinder head gasket
leaking between a cylinder and an adjacent water
jacket are:
þ Engine overheating
þ Loss of coolant
þ Excessive steam (white smoke) emitting from
exhaust
þ Coolant foaming
CYLINDER-TO-CYLINDER LEAKAGE TEST
To determine if an engine cylinder head gasket is
leaking between adjacent cylinders, follow the proce-
dures in Cylinder Compression Pressure Test in this
section. An engine cylinder head gasket leaking
between adjacent cylinders will result in approxi-
mately a 50±70% reduction in compression pressure.
CYLINDER-TO-WATER JACKET LEAKAGE TEST
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING WITH COOLANT PRES-
SURE CAP REMOVED.
VISUAL TEST METHOD
With the engine cool, remove the coolant pressure
cap. Start the engine and allow it to warm up until
thermostat opens.
If a large combustion/compression pressure leak
exists, bubbles will be visible in the coolant.
COOLING SYSTEM TESTER METHOD
WARNING: WITH COOLING SYSTEM TESTER IN
PLACE, PRESSURE WILL BUILD UP FAST. EXCES-
SIVE PRESSURE BUILT UP, BY CONTINUOUS
ENGINE OPERATION, MUST BE RELEASED TO A
SAFE PRESSURE POINT. NEVER PERMIT PRES-
SURE TO EXCEED 138 kPa (20 psi).
Install Cooling System Tester 7700 or equivalent to
pressure cap neck. Start the engine and observe the
tester's pressure gauge. If gauge pulsates with every
power stroke of a cylinder a combustion pressure
leak is evident.
CHEMICAL TEST METHOD
Combustion leaks into the cooling system can also
be checked by using Bloc-Chek Kit C-3685-A or
equivalent. Perform test following the procedures
supplied with the tool kit.
REMOVAL
(1) Disconnect the battery negative cable.
(2) Drain cooling system.
(3) Remove the air cleaner resonator and duct
work.
(4) Remove the generator.
(5) Remove closed crankcase ventilation system.
(6) Disconnect the evaporation control system.
(7) Perform the Fuel System Pressure Release pro-
cedure (Refer to 14 - FUEL SYSTEM/FUEL DELIV-
ERY - STANDARD PROCEDURE). Disconnect the
fuel supply line (Refer to 14 - FUEL SYSTEM/FUEL
DELIVERY/QUICK CONNECT FITTING - STAN-
DARD PROCEDURE).
(8) Disconnect heater hoses.
(9) Remove cylinder head covers and gaskets.
(10) Remove intake manifold and throttle body as
an assembly.
(11) Remove rocker arm assemblies and push rods.
Identify to ensure installation in original locations.
(12) Remove the head bolts from each cylinder
head and remove cylinder heads. Discard the cylin-
der head gasket.
CLEANING
Clean all surfaces of cylinder block and cylinder
heads.
Clean cylinder block front and rear gasket surfaces
using a suitable solvent.
INSPECTION
(1) Inspect the cylinder head for out-of-flatness,
using a straightedge and a feeler gauge. If tolerances
exceed 0.0508 mm (0.002 in.) replace the cylinder
head.
(2) Inspect the valve seats for damage. Service the
valve seats as necessary.
(3) Inspect the valve guides for wear, cracks or
looseness. If either condition exist, replace the cylin-
der head.
(4) Inspect pushrods. Replace worn or bent push-
rods.
INSTALLATION
(1) Clean all surfaces of cylinder block and cylin-
der heads.
(2) Clean cylinder block front and rear gasket sur-
faces using a suitable solvent.
CAUTION: The head gaskets are not interchange-
able between left and right sides. They are marked
ªLº and ªRº to indicate left and right sides.
(3) Position new cylinder head gaskets onto the
cylinder block.
9 - 200 ENGINE - 5.7LDR
CYLINDER HEAD (Continued)

ENGINE 5.9L DIESEL
DESCRIPTION
The cylinder block is constructed of cast iron. The
casting is a skirted design which incorporates longi-
tudal ribs for superior strength and noise reduction.
The block incorporates metric straight thread o-ring
fittings at lubrication oil access points. The engine
(Fig. 1) is manufactured with the cylinders being a
non-sleeved type cylinder. However, one approved
service method is to bore out the cylinders and add
cylinder sleeves to the cylinder block.
The cylinders are numbered front to rear (Fig. 2); 1
to 6. The firing order is 1±5±3±6±2±4.
Fig. 1 CumminsT24-Valve Turbo-Diesel Engine
Fig. 2 Cylinder Numbering
9 - 232 ENGINE 5.9L DIESELDR

CONDITION POSSIBLE CAUSES CORRECTION
2. Engine running too cold. 2. Refer to Coolant Temperature Below
Normal (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING).
3. Oil viscosity too thick. 3. Make sure the correct oil is being used.
(Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
DESCRIPTION).
4. Oil pressure relief valve stuck
closed or binding4. Check and replace valve.
LUBRICATING OIL LOSS 1. External leaks. 1. Visually inspect for oil leaks. Repair as
required.
2. Crankcase being overfilled. 2. Verify that the correct dipstick is being
used.
3. Incorrect oil specification or
viscosity.3. (a) Make sure the correct oil is being
used (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
DESCRIPTION).
(b) Look for reduced viscosity from dilution
with fuel.
(c) Review/reduce oil change intervals.
4. Oil cooler leak 4. Check and replace the oil cooler.
5. High blow-by forcing oil out the
breather.5. Check the breather tube area for signs of
oil loss. Perform the required repairs.
6. Turbocharger leaking oil to the air
intake.6. Inspect the air ducts for evidence of oil
transfer. Repair as required.
COMPRESSION KNOCKS 1. Air in the fuel system. 1. Identify location of air leak and repair. Do
not bleed high pressure fuel system.
2. Poor quality fuel or water/gasoline
contaminated fuel.2. Verify by operating from a temporary
tank with good fuel. Clean and flush the
fuel tank. Replace fuel/water separator filter.
3. Engine overloaded. 3. Verify the engine load rating is not being
exceeded.
4. Improperly operating injectors. 5. Check and replace misfiring/inoperative
injectors.
EXCESSIVE VIBRATION 1. Loose or broken engine mounts. 1. Replace engine mounts.
2. Damaged fan or improperly
operating accessories.2. Check and replace the vibrating
components.
3. Improperly operating vibration
damper3. Inspect/replace vibration damper.
4. Improperly operating electronically
controlled viscous fan drive.4. Inspect/replace fan drive.
5. Worn or damaged generator
bearing.5. Check/replace generator.
6. Flywheel housing misaligned. 6. Check/correct flywheel alignment.
9 - 234 ENGINE 5.9L DIESELDR
ENGINE 5.9L DIESEL (Continued)

SPECIFICATIONS
SPECIFICATIONS - 5.9L DIESEL
GENERAL DESCRIPTION
DESCRIPTION SPECIFICATION
Engine Type In-Line 6 Cyl. Turbo
Diesel
Displacement 5.9 Liters
359 ( Cubic Inches)
Bore 102.0 mm (4.02 in.)
Stroke 120.0 mm (4.72 in.)
Compression Ratio 17.2:1
305/250/235 H.P Version
Cylinder Pressure
(Minimum)350 psi.
Horsepower High Output
48 RE A/T and NV 5600
M/T305 HP @ 2900 RPM
Horsepower Standard
Output 48 RE A/T and
NV 4500 M/T235 HP @ 2700 RPM
(CARB)
250 HP @ 2900 RPM
(49 State)
Torque Rating High
Output ( 48RE A/T and
NV 5600 M/T)555 LB-FT @ 1400 RPM
Torque Rating Standard
Output ( 48RE A/T and
NV 4500 M/T)460 LB-FT @ 1400 RPM
Lubrication System Pressure Feed-Full Flow
With Bypass Valve
Firing Order 1-5-3-6-2-4
Cylinder Block Cast Iron
Crankshaft Induction Hardened
Forged Steel
Cylinder Head Cast Iron With Valve Seat
Inserts
Combustion Chambers High Swirl Bowl
Camshaft Chilled Ductile Iron
Pistons Cast Aluminum
Connnecting Rods Cross Rolled Micro Alloy
PISTONS
DESCRIPTION SPECIFICATION
Metric Standard
Skirt Diameter 101.775 -
101.793 mm4.007 - 4.008 in.
Ring Groove
Clearance
Intermediate
(Min)0.045 mm .0018 in
(Max) 0.095 mm 0.0037 in.
Oil Control (Min) 0.040 mm .0016 in.
(Max) 0.085 mm .0033 in.
PISTON PINS
DESCRIPTION SPECIFICATION
Metric Standard
Pin Diameter
(Min)39.990 mm 1.5744 in.
(Max) 40.003 mm 1.5749 in.
Bore Diameter
(Min)40.006 mm 1.5750 in.
(Max) 40.012 1.5753 in.
PISTON RINGS
DESCRIPTION SPECIFICATION
Metric Standard
Ring Gap
Top Ring 0.26 - 0.36mm 0.010 - 0.014 in.
Intermediate 0.85 - 1.15 mm 0.033 - 0.045in.
Oil Control 0.25 - 0.55 mm 0.010 - 0.21 in.
9 - 244 ENGINE 5.9L DIESELDR
ENGINE 5.9L DIESEL (Continued)

ENGINE DATA PLATE
DESCRIPTION
The engine data plate contains specific information
that is helpful to servicing and obtaining parts for
the engine. The data plate can be found affixed to the
breather cover on the left side of the engine. Informa-
tion that can be found on the data plate includes:
²Date of Engine Manufacture
²Engine Serial Number
²Control Parts List (CPL)
²Engine Rated Horsepower
²Engine Firing Order
²Engine Displacement
²Valve Lash Reset Specifications
If the engine data plate is missing or not legible,
the engine serial number is used for engine identifi-
cation. The engine serial number is stamped on the
right side of the block, on top of the oil cooler cavity
(Fig. 5).
AIR CLEANER ELEMENT
REMOVAL
Testing Air Cleaner Element using Filter MinderŸ
Do not attempt to unnecessarily remove top
of air cleaner housing for air cleaner element
inspection on diesel engines.
The air cleaner (filter) housing is equipped with an
air Filter MinderŸ gauge (Fig. 6). This air flow
restriction gauge will determine when air cleaner ele-
ment is restricted and should be replaced.
The Filter MinderŸ consists of a diaphragm and
calibrated spring sealed inside of a plastic housing
(Fig. 7). A yellow colored disc attached to diaphragm
moves along a graduated scale on side of Filter
Minder. After the engine has been shut off, a ratch-
eting device located within Filter Minder will hold
yellow disc at highest restriction that air cleaner ele-
ment has experienced. A drop in air pressure due toan air cleaner element restriction moves diaphragm
and yellow disc will indicate size of air drop.
CAUTION: Certain engine degreasers or cleaners
may discolor or damage plastic housing of Filter
Minder. Cover and tape Filter Minder if any engine
degreasers or cleaners are to be used.
To test, turn engine off. If yellow disc (Fig. 7) has
reached red colored zone on graduated scale, air
cleaner element should be replaced. Refer to Removal
/ Installation.
Resetting Filter Minder:After air cleaner (filter)
element has been replaced, press rubber button on
top of Filter Minder (Fig. 7). This will allow yellow
colored disc to reset. After button has been pressed,
yellow disc should spring back to UP position.
If Filter Minder gauge has reached red colored
zone, and after an examination of air cleaner (filter)
element, element appears to be clean, high reading
may be due to a temporary condition such as snow
build-up at air intake. Temporary high restrictions
may also occur if air cleaner (filter) element has got-
ten wet such as during a heavy rain or snow. If this
occurs, allow element to dry out during normal
engine operation. Reset rubber button on top of Filter
Minder and retest after element has dried.
Fig. 5 Engine Serial Number Location
Fig. 6 5.9L DIESEL AIR CLEANER - FILTER
MINDERŸ
1 - CLIPS
2 - FILTER COVER
3 - FILTER MINDERŸ
4 - INLET AIR TEMPERATURE/ PRESSURE SENSOR
5 - FILTER HOUSING
9 - 248 ENGINE 5.9L DIESELDR