1999 DODGE RAM engine oil

2) Ensure journal diameter, taper and out-of-round are within
specification. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table
under ENGINE SPECIFICATIONS. Upper main bearings contain oil holes,
while lower bearings installed in main bearing cap do not.
3) Apply light coat of engine oil to threads before
tightening bolt to specification. See TORQUE SPECIFICATIONS table.
Ensure oil clearance and end play are within specification. See
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table.
CAUTION: Crankshaft journal grinding should not exceed .012" (.30 mm)
under standard size. DO NOT grind thrust surfaces of No. 3
main bearing. Final paper or cloth polishing after regrind
must be done in same direction as engine rotation.
Thrust Bearing
Thrust bearing is located on No. 3 main bearing. Replace
thrust bearing if crankshaft end play is not within specification. See
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table under ENGINE
SPECIFICATIONS.
NOTE: Cylinder bore should be measured at room temperature of 70
F
(21C).
Cylinder Block
1) Check cylinder bore, out-of-round and taper. Measure
cylinder bore diameter below top surface of cylinder bore, middle of
bore and bottom of cylinder bore. Bore cylinder block if bore diameter
is not within specification. See CYLINDER BLOCK table under ENGINE
SPECIFICATIONS.
NOTE: Cylinder block is marked to indicate oversize valve lifters.
See SPECIAL ENGINE MARKS.
2) Check valve lifter bore diameter. Check for scoring. If
scoring exists or lifter bore diameter is not within specification,
ream cylinder block bore for next oversize valve lifter. See VALVE
LIFTERS table under ENGINE SPECIFICATIONS.
ENGINE OILING
ENGINE LUBRICATION SYSTEM
System has a rotor-type oil pump and full-flow oil filter.
Oil is forced by pump through a series of oil passages in engine to
provide lubrication to engine components. Oil is supplied to rocker
assembly through hollow push rods. Push rods are fed oil from lifters.
See Fig. 17 .
Crankcase Capacity
On 3.9L, oil capacity with oil filter is 4.0 qts. (3.8L). On
5.2L and 5.9L, oil capacity with oil filter is 5.0 qts. (4.7L).
Oil Pressure
Oil pressure is 6 psi (.4 kg/cm
) at idle and 30-80 psi (2.1-
5.6 kg/cm) at 3000 RPM with engine at normal operating temperature.

Fig. 17: Cross-Sectional View Of Engine Oil Circuit
Courtesy of Chrysler Corp.
OIL LINE PLUG
1) The oil line plug is located in vertical passage in rear
of block between oil-to-filter and oil-from-filter passages. See
Fig. 18 . Missing or improperly installed plug could cause erratic, low
or no oil pressure.
2) To check installation, remove oil sending unit and insert
wire down passage. Oil line plug should be 7.50-7.68 in. (190.0-195.2
mm) from machined surface of block. If plug is too high, use suitable
dowel to position properly. If plug is too low, remove oil pan, oil
pump and rear main bearing cap. Use suitable dowel to position
properly.
3) To remove for passage cleaning or plug replacement, drive
plug from oil sending unit hole out bottom of block. When installing

OIL PUMP SPECIFICATIONS








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Application Specification
Inner & Outer Rotor Thickness ................ .825" (20.96 mm) Min.\
Outer Rotor Diameter .......................... 2.47" (62.7 mm) Min.\
Outer Rotor-To-Pump Body Clearance ............. .014" (.36 mm) Max.\
Pump Cover Warpage ........................... .0015" (.038 mm) Max.\
Rotor End Clearance ................................. .004" (.10 mm)\
Rotor Tip Clearance ............................ .008" (.20 mm) Max.\
Spring Free Length ................................. 1.95" (49.5 mm)\
Spring Tension ......... 19.5-20.5 Lbs. @ 1.34" (8.8-9.3 kg @ 34 mm)\









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CAUTION: Ensure oil pump fully engages with distributor drive shaft
before tightening bolt. It may be necessary to slightly
rotate oil pump during installation to align with distributor
drive shaft.
Reassembly & Installation
To reassemble, reverse disassembly procedure. Install NEW
relief valve retainer cap and oil seal ring. Tighten pump cover bolts.
Fill rotor cavity with engine oil before installing. To install,
reverse removal procedure.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS








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Application Ft. Lbs. (N.m)\
Axle Bracket-To-Bellhousing Bolt
Dakota 4WD & Durango 4WD ................................. 65 (88)\
Axle Shaft Nut
Dakota 4WD & Durango 4WD ............................... 180 (244)\
Axle Shaft-To-Differential Flange Bolt
Dakota 4WD & Durango 4WD ................................. 65 (88)\
Axle-To-Insulator Bolt
Dakota 4WD & Durango 4WD ................................ 75 (102)\
Camshaft Sprocket Bolt ..................................... 50 (68)\
Camshaft Thrust Plate Bolt ................................. 18 (24)\
Clutch Housing-To-Cylinder Block Bolt
Dakota
(1) ..................................................... 30 (41)
( 2) ..................................................... 50 (68)
Ram Pickup
( 1)
3/8" Bolt ............................................ 33 (45)\
7/16" Bolt ........................................... 50 (68)\
( 2) ........................................................ N/A
Connecting Rod Bolt ........................................ 45 (61)\
Crankshaft Pulley Bolt ..................................... 18 (24)\
Cylinder Head Bolt ( 3)
Step 1 ................................................... 50 (68)\
Step 2 ................................................. 105 (142)\
Step 3 (Verify Torque) ................................. 105 (142\
)
Differential Pinion Nose Bracket-To-Adapter Bolt
Dakota 4WD & Durango 4WD ................................. 65 (88)\
Differential Pinion Nose Bracket-To-Bellhousing Bolt
Dakota 4WD & Durango 4WD ................................. 65 (88)\
Engine Mount Bracket-To-Frame Rail Bolt
Dakota 2WD & Durango 2WD ................................. 30 (41)\

Engine Mount Through-Bolt
Dakota 2WD & Durango 2WD ................................. 50 (68)\
Dakota 4WD, Durango 4WD & Ram Pickup .................... 75 (102)\
Grand Cherokee ............................................. 60 (81)\
Engine Mount-To-Cylinder Block Bolt
Dakota & Durango ......................................... 30 (41)\
Ram Pickup ............................................... 60 (81)\
Ram Van/Wagon & Grand Cherokee ............................. 65 (88)\
Engine Mount-To-Frame Bracket Bolt/Nut
Ram Pickup & Ram Van/Wagon .............................. 75 (102)\
Exhaust Manifold Bolt & Nut
Durango .................................................. 18 (24)\
All Others ................................................. 25 (34)\
Flywheel/Flexplate-To-Crankshaft Bolt ...................... 55 (75)\
Front Cover Bolt ........................................... 30 (41)\
Heat Shield Bolts .......................................... 30 (41)\
Main Bearing Cap Bolt ..................................... 85 (115)\
Oil Drain Plug ............................................. 25 (34)\
Oil Filter Adapter Stud .................................... 50 (68)\
Oil Pan Bolt ............................................... 18 (24)\
Oil Pump Bolt .............................................. 30 (41)\
Rocker Arm Bolt ............................................ 21 (28)\
Shift Motor Bolt
Dakota 4WD & Durango 4WD ................................. 65 (88)\
Spark Plug ................................................. 30 (41)\
Starter Bolts .............................................. 50 (68)\
Throttle Body Bolt ......................................... 17 (23)\
Transfer Case Yoke Bolt
Dakota 4WD & Durango 4WD ................................. 20 (27)\
Vibration Damper Bolt .................................... 135 (183)\
Water Pump Bolt ............................................ 30 (41)\
INCH Lbs. (N.m)
Intake Manifold Bolt ( 4)
Step 1 .................................................. 24 (2.7)\
Step 2 .................................................. 48 (5.4)\
Step 3 .................................................. 84 (9.5)\
Step 4 (Verify Torque All Bolts) ........................ 84 (9.5\
)
Intake Manifold Plenum Pan Bolt
Step 1 .................................................. 24 (2.7)\
Step 2 .................................................. 48 (5.4)\
Step 3 .................................................. 84 (9.5)\
Step 4 (Verify Torque) .................................. 84 (9.5\
)
Oil Pump Cover Bolt ........................................ 97 (11)\
Valve Cover Bolts .......................................... 95 (11)\
( 1) - Bolts through clutch housing into cylinder block.
( 2) - Bolts through cylinder block into clutch housing.
( 3) - Tighten bolts in sequence. See 7.
( 4) - Tighten bolts in sequence. See 5 and 6.









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ENGINE SPECIFICATIONS
GENERAL SPECIFICATIONS (3.9L)








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Application Specification
Displacement .................................... 239 Cu. In. (3.9L)\
Bore ............................................... 3.91" (99.3 mm)\
Stroke ............................................. 3.31" (84.1 mm)\

rust may be removed using bead blasting method. Components must be
free of oil and grease prior to bead blasting. Beads will stick to
grease or oil soaked areas causing area not to be cleaned.
Use air pressure to remove all trapped residual beads from
components after cleaning. After cleaning internal engine parts made
of aluminum, wash thoroughly with hot soapy water. Component must be
thoroughly cleaned as glass beads will enter engine oil resulting in
bearing damage.
CHEMICAL CLEANING
Solvent tank is used for cleaning oily residue from
components. Solvent blasting sprays solvent through a siphon gun using
compressed air.
The hot tank, using heated caustic solvents, is used for
cleaning ferrous materials only. DO NOT clean aluminum parts such as
cylinder heads, bearings or other soft metals using the hot tank.
After cleaning, flush parts with hot water.
A non-ferrous part will be ruined and caustic solution will
be diluted if placed in the hot tank. Always use eye protection and
gloves when using the hot tank.
Use of a cold tank is for cleaning of aluminum cylinder
heads, carburetors and other soft metals. A less caustic and unheated
solution is used. Parts may be lift in the tank for several hours
without damage. After cleaning, flush parts with hot water.
Steam cleaning, with boiling hot water sprayed at high
pressure, is recommended as the final cleaning process when using
either hot or cold tank cleaning.
COMPONENT CLEANING
* PLEASE READ THIS FIRST *
NOTE: Always refer to appropriate engine overhaul article in the
ENGINES section for complete overhaul procedures and
specifications for the vehicle being repaired.
SHEET METAL PARTS
Examples of sheet metal parts are the rocker covers, front
and side covers, oil pan and bellhousing dust cover. Glass bead
blasting or hot tank may be used for cleaning.
Ensure all mating surfaces are flat. Deformed surfaces should
be straightened. Check all sheet metal parts for cracks and dents.
INTAKE & EXHAUST MANIFOLDS
Using solvent cleaning or bead blasting, clean manifolds for
inspection. If the intake manifold has an exhaust crossover, all
carbon deposits must be removed. Inspect manifolds for cracks, burned
or eroded areas, corrosion and damage to fasteners.
Exhaust heat and products of combustion cause threads of
fasteners to corrode. Replace studs and bolts as necessary. On "V"
type intake manifolds, the sheet metal oil shield must be removed for
proper cleaning and inspection. Ensure that all manifold parting
surfaces are flat and free of burrs.
CYLINDER HEAD REPLACEMENT
* PLEASE READ THIS FIRST *

NOTE: Always refer to appropriate engine overhaul article in the
ENGINES section for complete overhaul procedures and
specifications for the vehicle being repaired.
REMOVAL
Remove intake and exhaust manifolds and valve cover. Cylinder
head and camshaft carrier bolts (if equipped), should be removed only
when the engine is cold. On many aluminum cylinder heads, removal
while hot will cause cylinder head warpage. Mark rocker arm or
overhead cam components for location.
Remove rocker arm components or overhead cam components.
Components must be installed in original location. Individual design
rocker arms may utilize shafts, ball-type pedestal mounts or no rocker
arms. For all design types, wire components together and identify
according to the corresponding valve. Remove cylinder head bolts.
Note length and location. Some applications require cylinder head
bolts be removed in proper sequence to prevent cylinder head damage.
See Fig. 1 . Remove cylinder head.
Fig. 1: Typical Cylinder Head Tightening or Loosening Sequence
This Graphic For General Information Only
INSTALLATION
Ensure all surfaces and head bolts are clean. Check that head
bolt holes of cylinder block are clean and dry to prevent block damage
when bolts are tightened. Clean threads with tap to ensure accurate
bolt torque.
Install head gasket on cylinder block. Some manufacturer's
may recommend sealant be applied to head gasket prior to installation.
Note that all holes are aligned. Some gasket applications may be
marked so certain area faces upward. Install cylinder head using care
not to damage head gasket. Ensure cylinder head is fully seated on
cylinder block.
Some applications require head bolts be coated with sealant
prior to installation. This is done if head bolts are exposed to water
passages. Some applications require head bolts be coated with light
coat of engine oil.

On cast cylinder heads, if warpage exceeds .003" (.08 mm)
in a 6" span, or .006" (.15 mm) over total length, cylinder head must
be resurfaced. On most aluminum cylinder heads, if warpage exceeds .
002" (.05 mm) in any area, cylinder head must be resurfaced. Warpage
specification may vary with manufacturer.
Cylinder head thickness should be measured to determine
amount of material which can be removed before replacement is
required. Cylinder head thickness must not be less than manufacturer's
specifications.
If cylinder head required resurfacing, it may not align
properly with intake manifold. On "V" type engines, misalignment is
corrected by machining intake manifold surface that contacts cylinder
head. Cylinder head may be machined on surface that contacts intake
manifold.
Using oil stone, remove burrs or scratches from all sealing
surfaces.
VALVE SPRINGS
Inspect valve springs for corroded or pitted valve spring
surfaces which may lead to breakage. Polished spring ends caused by
a rotating spring, indicates that spring surge has occurred. Replace
springs showing evidence of these conditions.
Inspect valve springs for squareness using a 90 degree
straightedge. See Fig. 4. Replace valve spring if out-of-square
exceeds manufacturer's specification.
Fig. 4: Checking Valve Spring Squareness - Typical
This Graphic For General Information Only
Using vernier caliper, measure free length of all valve
springs. Replace springs if not within specification. Using valve

than .010" (.25 mm) from tip. Chamfer sharp edge of reground valve
tip. Recheck valve stem installed height.
VALVE STEM OIL SEALS
Valve stem oil seals must be installed on valve stem. See
Fig. 2 . Seals are needed due to pressure differential at the ends of
valve guides. Atmospheric pressure above intake guide, combined with
manifold vacuum below guide, causes oil to be drawn into the cylinder.
Exhaust guides also have pressure differential created by
exhaust gas flowing past the guide, creating a low pressure area. This
low pressure area draws oil into the exhaust system.
Replacement (On Vehicle)
Mark rocker arm or overhead cam components for location.
Remove rocker arm components or overhead cam components. Components
must be installed in original location. Remove spark plugs. Valve stem
oil seals may be replaced by holding valves against seats using air
pressure.
Air pressure must be installed in cylinder using an adapter
for spark plug hole. An adapter can be constructed by welding air hose
connection to spark plug body with porcelain removed.
Install adapter in spark plug hole. Apply a minimum of 140
psi (9.8 kg/cm
) to adapter. Air pressure should hold valve closed. If
air pressure does not hold valve closed, check for damaged or bent
valve. Cylinder head must be removed for service.
Using valve spring compressor, compress valve springs. Remove
valve locks. Carefully release spring compressor. Remove retainer or
rotator and valve spring. Remove valve stem oil seal.
If oversized valves have been installed, oversized oil seals
must be used. Coat valve stem with engine oil. Install protective
sleeve over end of valve stem. Install new oil seal over valve stem
and seat on valve guide. Remove protective sleeve. Install spring
seat, valve spring and retainer or rotator. Compress spring and
install valve locks. Remove spring compressor. Ensure valve locks
are fully seated.
Install rocker arms or overhead cam components. Tighten all
bolts to specification. Adjust valves if required. Remove adapter.
Install spark plugs, valve cover and gasket.
VALVE SPRING INSTALLED HEIGHT
Valve spring installed height should be checked during
reassembly. Measure height from lower edge of valve spring to the
upper edge. DO NOT include valve spring seat or retainer. Distance
must be within specifications. If valves and/or seats have been
ground, a valve spring shim may be required to correct spring height.
See Fig. 12 .
Fig. 12: Measuring Valve Spring Installed Height - Typical
This Graphic For General Information Only