1998 DODGE RAM 1500 engine oil

(5) Measure the ring side clearance as shown (Fig.
14)make sure the feeler gauge fits snugly between
the ring land and the ring. Replace any ring not
within specification.
(6) Rotate the ring around the piston, the ring
must rotate in the groove with out binding.
PISTON RING SPECIFICATION CHART
Ring Position Groove Maximum
Clearance Clearance
Upper Ring 0.6715-
.0.7105mm0.11mm
(0.0264- 0.0279
in.)(0.004 in.)
Intermediate Ring 0.5455-
0.6245mm0.10mm
(0.0214-0.0245
in.)(0.004 in.)
Ring Position Ring Gap Wear Limit
Upper Ring 0.23-0.38mm 0.43mm
(0.0090-0.0149
in.)(0.017 in.)
Intermediate Ring 0.35-0.60mm 0.74mm
(0.0137-0.0236
in.)(0.029 in.)
Oil Control Ring 0.015-0.66mm 1.55mm
(Steel Rail) (0.0059- 0.0259
in.)(0.061 in.)
(7) The No. 1 and No. 2 piston rings have a differ-
ent cross section. Ensure No. 2 ring is installed with
manufacturers I.D. mark (Dot) facing up, towards top
of the piston.
NOTE: Piston rings are installed in the following
order:
²Oil ring expander.
²Lower oil ring side rail.
²Upper oil ring side rail.
²No. 2 Intermediate piston ring.
²No. 1 Upper piston ring.
(8) Install the oil ring expander.
(9) Install upper side rail (Fig. 15) by placing one
end between the piston ring groove and the expander
ring. Hold end firmly and press down the portion to
be installed until side rail is in position. Repeat this
step for the lower side rail.
Fig. 15 SIDE RAIL - INSTALLATION
1 - SIDE RAIL END
Fig. 14 Measuring Piston Ring Side Clearance
1 - FEELER GAUGE
9 - 214 ENGINE - 5.7LDR
PISTON RINGS (Continued)

CAUTION: The structural cover must be held tightly
against the corner formed by the engine and the
transmission clutch housing during tightening
sequence. Failure to do so may cause damage to
the cover and engine noise.
(4) Torque the (2)structural dust cover bolts that
go into the clutch housing to 6-11 N´m (50-100
in.lbs.).
(5) Torque the (4) structural dust cover bolts that
go into the engine block to 6-11 N´m (50-100 in.lbs.).
(6) Torque the structural cover bolt that is closest
to the rear face of block on the passenger side of
block to 54 N´m (40 ft. lbs.).
(7) Torque the structural cover bolt that is closest
to the front face of block on the drivers side to 54
N´m (40 ft. lbs.).(8) Torque the remaining (2) structural cover bolts
that go into theblockin an ªXº pattern to 54 N´m
(40 ft. lbs.).
(9) Torque the structural cover bolts that go into
theclutch housingto 54 N´m (40 ft. lbs.).
(10) Torque the 7/16 inch engine block to clutch
housing bolts to 68 N´m (50 ft. lbs.).
FRONT MOUNT
REMOVAL
2WD
(1) Disconnect negative battery cable.
(2) Raise vehicle.
(3) Remove engine mount through bolts.
(4) Raise engine using engine support fixture spe-
cial tool # 8534.
(5) Remove engine mount to insulator bolts (Fig.
21), (Fig. 22).
(6) Remove insulator from engine.
4WD
(1) Disconnect the negative cable from the battery.
(2) Raise the vehicle.
(3) Remove the skid plate.
(4) Remove the front crossmember(Refer to 13 -
FRAME & BUMPERS/FRAME/FRONT CROSS-
MEMBER - REMOVAL).
(5) Remove the engine oil filter.Fig. 20 Structural Cover - Manual Transmission
1 - STRUCTURAL COVER
2 - BOLT
3 - BOLT
4 - BOLT
5 - BOLT
6 - BOLT
7 - BOLT
Fig. 21 RH INSULATOR
1 - BOLT
2 - INSULATOR
DRENGINE - 5.7L 9 - 217
STRUCTURAL COVER (Continued)

(8) Torque the (3) bolts that attach the front axle
to the left engine bracket to 101 N´m (75 ft. lbs.).
(9) Install the engine oil filter, if removed.
(10) Install the front crossmember(Refer to 13 -
FRAME & BUMPERS/FRAME/FRONT CROSS-
MEMBER - INSTALLATION).
(11) Install the skid plate.
(12) Lower the vehicle.
(13) Reconnect the negative battery cable.
REAR MOUNT
REMOVAL
(1) Raise the vehicle on a hoist.
(2) Using a suitable jack, support transmission.
(3) Remove the nuts from the transmission mount
(Fig. 26).
(4) Remove the two bolts that attach the transmis-
sion mount to the engine bracket.
(5) Raise the transmission enough to remove the
mount from the crossmember.
(6) Remove the mount.
INSTALLATION
NOTE: Threadlocking compound must be applied to
the bolts before installation.(1) Install the two bolts that attach the transmis-
sion mount to the transmission bracket.
(2) Torque the bolts to 61N´m (45 ft.lbs.) torque.
(3) Lower the transmission so the transmission
mount rests on the crossmember, and the studs of
the transmission mount are aligned in the slots in
the crossmember.
(4) Install the nuts onto the transmission mount
studs through the crossmember access slot.
(5) Torque the nuts to 54N´m (40 ft. lbs.).
LUBRICATION
DESCRIPTION
The lubrication system (Fig. 27) is a full flow fil-
tration pressure feed type.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - CHECKING
ENGINE OIL PRESSURE
(1) Remove oil pressure sending unit and install
gauge assembly C-3292.
(2) Run engine until thermostat opens.
(3) Oil Pressure:
²Curb Idle±25 kPa (4 psi) minimum
²3000 rpm±170 - 758 kPa (25 - 110 psi)
(4) If oil pressure is 0 at idle, shut off engine.
Check for a clogged oil pick-up screen or a pressure
relief valve stuck open.
DIAGNOSIS AND TESTING - ENGINE OIL LEAK
Begin with a thorough visual inspection of the
engine, particularly at the area of the suspected leak.
If an oil leak source is not readily identifiable, the
following steps should be followed:
(1) Do not clean or degrease the engine at this
time because some solvents may cause rubber to
swell, temporarily stopping the leak.
(2) Add an oil soluble dye (use as recommended by
manufacturer). Start the engine and let idle for
approximately 15 minutes. Check the oil dipstick to
make sure the dye is thoroughly mixed as indicated
with a bright yellow color under a black light.
(3) Using a black light, inspect the entire engine
for fluorescent dye, particularly at the suspected area
of oil leak. If the oil leak is found and identified,
repair per service manual instructions.
(4) If dye is not observed, drive the vehicle at var-
ious speeds for approximately 24 km (15 miles), and
repeat inspection.If the oil leak source is not pos-
itively identified at this time, proceed with the air
leak detection test method.
Fig. 26 TRANSMISSION MOUNT
1 - MOUNT
2 - CROSSMEMBER
3 - NUT
4 - BOLT
9 - 220 ENGINE - 5.7LDR
FRONT MOUNT (Continued)

Air Leak Detection Test Method
(1) Remove the PCV valve from the IAFM. Cap or
plug the PCV valve grommet.
(2) Attach an air hose with pressure gauge and
regulator to the dipstick tube.
CAUTION: Do not subject the engine assembly to
more than 20.6 kPa (3 PSI) of test pressure.
(3) Gradually apply air pressure from 1 psi to 2.5
psi maximum while applying soapy water at the sus-
pected source. Adjust the regulator to the suitable
test pressure that provide the best bubbles which
will pinpoint the leak source. If the oil leak is
detected and identified, repair per service manual
procedures.(4) If the leakage occurs at the rear oil seal area,
refer to the section, Inspection for Rear Seal Area
Leak.
(5) If no leaks are detected, turn off the air supply
and remove the air hose and all plugs and caps.
Install the PCV valve.
(6) Clean the oil off the suspect oil leak area using
a suitable solvent. Drive the vehicle at various
speeds approximately 24 km (15 miles). Inspect the
engine for signs of an oil leak by using a black light.
INSPECTION FOR REAR SEAL AREA LEAKS
Since it is sometimes difficult to determine the
source of an oil leak in the rear seal area of the
engine, a more involved inspection is necessary. The
following steps should be followed to help pinpoint
the source of the leak.
Fig. 27 Engine Oil Lubrication System
DRENGINE - 5.7L 9 - 221
LUBRICATION (Continued)

If the leakage occurs at the crankshaft rear oil seal
area:
(1) Disconnect the battery.
(2) Raise the vehicle.
(3) Remove torque converter or clutch housing
cover and inspect rear of block for evidence of oil.
Use a black light to check for the oil leak:
(a) Circular spray pattern generally indicates
seal leakage or crankshaft damage.
(b) Where leakage tends to run straight down,
possible causes are a porous block, distributor seal,
camshaft bore cup plugs oil galley pipe plugs, oil
filter runoff, and main bearing cap to cylinder
block mating surfaces.
(4) If no leaks are detected, pressurize the crank-
case as outlined in the, Inspection (Engine oil Leaks
in general)
CAUTION: Do not exceed 20.6 kPa (3 psi).
(5) If the leak is not detected, very slowly turn the
crankshaft and watch for leakage. If a leak is
detected between the crankshaft and seal while
slowly turning the crankshaft, it is possible the
crankshaft seal surface is damaged. The seal area on
the crankshaft could have minor nicks or scratches
that can be polished out with emery cloth.
CAUTION: Use extreme caution when crankshaft
polishing is necessary to remove minor nicks and
scratches. The crankshaft seal flange is especially
machined to complement the function of the rear oil
seal.
(6) For bubbles that remain steady with shaft
rotation, no further inspection can be done until dis-
assembled.
OIL
STANDARD PROCEDURE - ENGINE OIL
SERVICE
WARNING: NEW OR USED ENGINE OIL CAN BE
IRRITATING TO THE SKIN. AVOID PROLONGED OR
REPEATED SKIN CONTACT WITH ENGINE OIL.
CONTAMINANTS IN USED ENGINE OIL, CAUSED BY
INTERNAL COMBUSTION, CAN BE HAZARDOUS TO
YOUR HEALTH. THOROUGHLY WASH EXPOSED
SKIN WITH SOAP AND WATER. DO NOT WASH
SKIN WITH GASOLINE, DIESEL FUEL, THINNER, OR
SOLVENTS, HEALTH PROBLEMS CAN RESULT. DO
NOT POLLUTE, DISPOSE OF USED ENGINE OIL
PROPERLY.
ENGINE OIL SPECIFICATION
CAUTION: Do not use non-detergent or straight
mineral oil when adding or changing crankcase
lubricant. Engine failure can result.
API SERVICE GRADE CERTIFIED
Use an engine oil that is API Service Grade Certi-
fied. MOPARtprovides engine oils that conform to
this service grade.
SAE VISCOSITY
An SAE viscosity grade is used to specify the vis-
cosity of engine oil. Use only engine oils with multi-
ple viscosities such as 5W-30 in the 5.7L engines.
These are specified with a dual SAE viscosity grade
which indicates the cold-to-hot temperature viscosity
range. Select an engine oil that is best suited to your
particular temperature range and variation.
ENERGY CONSERVING OIL
An Energy Conserving type oil is recommended for
gasoline engines. The designation of ENERGY CON-
SERVING is located on the label of an engine oil con-
tainer.
CONTAINER IDENTIFICATION
Standard engine oil identification notations have
been adopted to aid in the proper selection of engine
oil. The identifying notations are located on the label
of engine oil plastic bottles and the top of engine oil
cans (Fig. 28).
OIL LEVEL INDICATOR (DIPSTICK)
The engine oil level indicator is located at the left
hand of the engine on the 5.7L engines.
CRANKCASE OIL LEVEL INSPECTION
CAUTION: Do not overfill crankcase with engine oil,
pressure loss or oil foaming can result.
Inspect engine oil level approximately every 800
kilometers (500 miles). Unless the engine has exhib-
ited loss of oil pressure, run the engine for about ten
Fig. 28 API SYMBOL
9 - 222 ENGINE - 5.7LDR
LUBRICATION (Continued)

minutes before checking oil level. Checking engine oil
level on a cold engine is not accurate.
To ensure proper lubrication of an engine, the
engine oil must be maintained at an acceptable level.
The acceptable levels are indicated between the ADD
and SAFE marks on the engine oil dipstick.
(1) Position vehicle on level surface.
(2) With engine OFF, allow approximately five
minutes for oil to settle to bottom of crankcase,
remove engine oil dipstick.
(3) Wipe dipstick clean.
(4) Install dipstick and verify it is seated in the
tube.
(5) Remove dipstick, with handle held above the
tip, take oil level reading.
(6) Add oil only if level is below the ADD mark on
dipstick.
ENGINE OIL CHANGE
Change engine oil at mileage and time intervals
described in Maintenance Schedules(Refer to LUBRI-
CATION & MAINTENANCE/MAINTENANCE
SCHEDULES - DESCRIPTION).
Run engine until achieving normal operating tem-
perature.
(1) Position the vehicle on a level surface and turn
engine off.
(2) Hoist and support vehicle on safety stands.
(3) Remove oil fill cap.
(4) Place a suitable drain pan under crankcase
drain.
(5) Remove drain plug from crankcase and allow
oil to drain into pan. Inspect drain plug threads for
stretching or other damage. Replace drain plug if
damaged.
(6) Install drain plug in crankcase. Torque to 34
N´m ( 25 ft. lbs.).
(7) Lower vehicle and fill crankcase with specified
type and amount of engine oil described in this sec-
tion.
(8) Install oil fill cap.
(9) Start engine and inspect for leaks.
(10) Stop engine and inspect oil level.
USED ENGINE OIL DISPOSAL
Care should be exercised when disposing used
engine oil after it has been drained from a vehicle
engine. Refer to the WARNING at beginning of this
section.
OIL FILTER
REMOVAL
All engines are equipped with a high quality full-
flow, disposable type oil filter. DaimlerChrysler Cor-
poration recommends a Mopartor equivalent oil
filter be used.
(1) Position a drain pan under the oil filter.
(2) Using a suitable oil filter wrench loosen filter.
(3) Rotate the oil filter counterclockwise to remove
it from the cylinder block oil filter boss.
(4) When filter separates from cylinder block oil
filter boss, tip gasket end upward to minimize oil
spill. Remove filter from vehicle.
NOTE: Make sure filter gasket was removed with fil-
ter.
(5) With a wiping cloth, clean the gasket sealing
surface of oil and grime.
INSTALLATION
(1) Lightly lubricate oil filter gasket with engine
oil.
(2) Thread filter onto adapter nipple. When gasket
makes contact with sealing surface, (Fig. 29) hand
tighten filter one half turn, or 180É,do not over
tighten.
(3) Add oil, verify crankcase oil level and start
engine. Inspect for oil leaks.
Fig. 29 Oil Filter Sealing Surface - Typical
1 - SEALING SURFACE
2 - RUBBER GASKET
3 - OIL FILTER
DRENGINE - 5.7L 9 - 223
OIL (Continued)

OIL PAN
REMOVAL
(1) Disconnect the negative battery cable.
(2) Install engine support fixture special tool #
8534.Do not raise engine at this time.
(3) Loosen both left and right side engine mount
through bolts. Do not remove bolts.
(4) Remove the structural dust cover, if equipped.
(5) Drain engine oil.
(6) Remove the front crossmember(Refer to 13 -
FRAME & BUMPERS/FRAME/FRONT CROSS-
MEMBER - REMOVAL).
CAUTION: Only raise the engine enough to provide
clearance for oil pan removal. Check for proper
clearance at fan shroud to fan and cowl to intake
manifold.
(7) Raise engine using special tool # 8534 to pro-
vide clearance to remove oil pan.
NOTE: Do not pry on oil pan or oil pan gasket. Gas-
ket is integral to engine windage tray and does not
come out with oil pan.
(8) Remove the oil pan mounting bolts and oil pan.
NOTE: The double ended oil pan studs must be
installed in the same location that they were
removed from.
(9) Unbolt oil pump pickup tube and remove tube.
(10) Inspect the integral windage tray and gasket
and replace as needed.
INSTALLATION
(1) Clean the oil pan gasket mating surface of the
block and oil pan.
(2) Inspect the integral windage tray and gasket
and replace as needed.
(3) Reinstall the oil pump pickup tube with new
o-ring. Tighten tube to pump fasteners to 28 N´m
(250 in. lbs.).
NOTE: The double ended oil pan studs must be
installed in the same location that they were
removed from.
(4) Position the oil pan and install the mounting
bolts and studs.. Tighten the mounting bolts to 12
N´m (105 in.lbs.).
(5) Lower the engine into mounts using special
tool # 8534.
(6) Install both the left and right side engine
mount through bolts. Tighten the nuts to 68 N´m (50
ft. lbs.).(7) Remove special tool # 8534.
(8) Install structural dust cover, if equipped.
(9) Install the front crossmember(Refer to 13 -
FRAME & BUMPERS/FRAME/FRONT CROSS-
MEMBER - INSTALLATION).
(10) Fill engine oil.
(11) Reconnect the negative battery cable.
(12) Start engine and check for leaks.
OIL PUMP
REMOVAL
(1) Remove the oil pan and pick-up tube(Refer to 9
- ENGINE/LUBRICATION/OIL PAN - REMOVAL).
(2) Remove the timing chain cover(Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT / CHAIN
COVER(S) - REMOVAL).
(3) Remove the four bolts, and the oil pump.
CLEANING
(1) Wash all parts in a suitable solvent.
INSPECTION
CAUTION: Oil pump pressure relief valve and
spring should not be removed from the oil pump. If
these components are disassembled and or
removed from the pump the entire oil pump assem-
bly must be replaced.
(1) Remove the pump cover.
(2) Clean all parts thoroughly. Mating surface of
the oil pump housing should be smooth. If the pump
cover is scratched or grooved the oil pump assembly
should be replaced.
(3) Slide outer rotor into the body of the oil pump.
Press the outer rotor to one side of the oil pump body
and measure clearance between the outer rotor and
the body (Fig. 30). If the measurement is 0.235mm
(0.009 in.) or more the oil pump assembly must be
replaced.
(4) Install the inner rotor in the into the oil pump
body. Measure the clearance between the inner and
outer rotors (Fig. 31). If the clearance between the
rotors is .150 mm (0.006 in.) or more the oil pump
assembly must be replaced.
(5) Place a straight edge across the body of the oil
pump (between the bolt holes), if a feeler gauge of
.095 mm (0.0038 in.) or greater can be inserted
between the straightedge and the rotors, the pump
must be replaced (Fig. 32).
(6) Reinstall the pump cover. Torque fasteners to
15 N´m (132 in. lbs.).
9 - 224 ENGINE - 5.7LDR

NOTE: The 5.7 Oil pump is released as an assem-
bly. There are no DaimlerChrysler part numbers for
Sub-Assembly components. In the event the oil
pump is not functioning or out of specification it
must be replaced as an assembly.
INSTALLATION
(1) Position the oil pump onto the crankshaft and
install the 4 oil pump retaining bolts.(2) Tighten the oil pump retaining bolts to 28 N´m
(250 in. lbs.).
(3) Install the timing chain cover(Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT / CHAIN
COVER(S) - INSTALLATION).
(4) Install the pick-up tube and oil pan(Refer to 9 -
ENGINE/LUBRICATION/OIL PAN - INSTALLA-
TION).
INTAKE MANIFOLD
DESCRIPTION
The intake manifold is made of a composite mate-
rial and features long runners which maximizes low
end torque. The intake manifold uses single plane
sealing which consist of eight individual press in
place port gaskets to prevent leaks.
DIAGNOSIS AND TESTING - INTAKE
MANIFOLD LEAKAGE
An intake manifold air leak is characterized by
lower than normal manifold vacuum. Also, one or
more cylinders may not be functioning.
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR
HANDS NEAR THE PULLEYS, BELTS OR THE FAN.
DO NOT WEAR LOOSE CLOTHING.
(1) Start the engine.
(2) Spray a small stream of water at the suspected
leak area.
(3) If a change in RPM is observed the area of the
suspected leak has been found.
(4) Repair as required.
Fig. 30 Measuring Outer Rotor Clearance
1 - FEELER GAUGE
2 - OUTER ROTOR
Fig. 31 Measuring Clearance Between Rotors -
Typical
1 - OUTER ROTOR
2 - FEELER GAUGE
3 - INNER ROTOR
Fig. 32 Measuring Clearance Over Rotors - Typical
1 - STRAIGHT EDGE
2 - FEELER GAUGE
DRENGINE - 5.7L 9 - 225
OIL PUMP (Continued)