1998 DODGE DURANGO cooling system

Downloaded from www.Manualslib.com manuals search engine REMOVALÐ4WD
(1) Disconnect the negative cable from the battery.
(2) Raise the vehicle on a hoist.
(3) Support the transmission with a transmission
jack.
(4) Remove stud nuts holding the insulator to the
crossmember (Fig. 39).
(5) Raise rear of transmission SLIGHTLY.
(6) Remove bolts holding the insulator to the insu-
lator bracket (Fig. 39). Remove the insulator.
INSTALLATIONÐ4WD
(1) If the insulator bracket was removed, install
the bracket to the transmission (Fig. 39). Tighten the
bolts to 28 N´m (250 in. lbs.) torque.
(2) Install the bolts holding insulator to insulator
bracket. Tighten the bolts to 28 N´m (250 in. lbs.)
torque.
(3) Lower rear of transmission while aligning the
insulator studs into the mounting support bracket.Install stud nuts and tighten to 28 N´m (250 in. lbs.)
torque.
(4) Remove the transmission jack.
(5) Lower the vehicle.
(6) Connect the negative cable to the battery.
ENGINE ASSEMBLY
REMOVAL
(1) Scribe hood hinge outlines on hood. Remove the
hood.
(2) Remove the battery.
(3) Drain cooling system. Refer to COOLING SYS-
TEM.
(4) Remove the air cleaner assembly and air inlet
hose.
(5) Disconnect the radiator and heater hoses.
(6) Set fan shroud aside.
(7) Remove the vacuum lines.
(8) Remove the distributor cap and wiring.
(9) Disconnect the accelerator linkage.
(10) Remove throttle body.
(11) Perform the Fuel System Pressure release
procedure Refer to FUEL SYSTEM.
(12) Disconnect the fuel lines.
(13) Disconnect the starter wires.
(14) Disconnect the oil pressure wire.
Fig. 37 Engine Mount Insulator at FrameÐ4WD
Vehicles
1 ± NUT
2 ± ENGINE SUPPORT BRACKET
3 ± INSULATOR
4 ± NUT
5 ± THROUGH BOLT
6 ± FRAME
7 ± FRONT AXLE
Fig. 38 Rear InsulatorÐ2WD Vehicles
1 ± ENGINE SUPPORT BRACKET
2 ± THROUGH BOLT
3 ± CROSSMEMBER
4 ± INSULATOR
5 ± TRANSMISSION EXTENSION
DN5.9L ENGINE 9 - 161
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine (15) Discharge the air conditioning system, if
equipped. Refer to HEATING and AIR CONDITION-
ING.
(16) Disconnect the air conditioning hoses.
(17) Disconnect the power steering hoses, if
equipped.
(18) Remove starter motor. Refer to STARTING
SYSTEMS.
(19) Remove the generator.
(20) Raise and support the vehicle on a hoist.
(21) Disconnect exhaust pipe at manifold.
(22) Remove Transmission. Refer to TRANSMIS-
SIONS.
CAUTION: DO NOT lift the engine by the intake
manifold.
(23) Install an engine lifting fixture.
(24)2WD VEHICLESÐRemove engine front
mount bolts.
(25)4WD VEHICLESÐThe engine and front
driving axle (engine/axle/transmission) are connectedthrough insulators and support brackets. Separate
the engine as follows:
²LEFT SIDEÐRemove 2 bolts attaching
(engine/pinion nose/transmission) bracket to trans-
mission bell housing. Remove 2 bracket to pinion
nose adaptor bolts. Separate engine from insulator by
removing upper nut washer assembly and bolt from
engine support bracket.
²RIGHT SIDEÐRemove 2 bracket to axle (dis-
connect housing) bolts and a bracket to bell housing
bolt. Separate engine from insulator by removing
upper nut washer assembly and bolt from engine
support bracket.
(26) Lower the vehicle.
(27) Install engine assembly on engine repair
stand.
INSTALLATION
(1) Remove engine from the repair stand and posi-
tion in the engine compartment.
(2) Install an engine support fixture.
(3) Raise and support the vehicle on a hoist.
(4) Install the engine front mounts.
(5) Refer to Group, 21 Transmissions for transmis-
sion installation
(6) Install the inspection plate.
(7) Remove transmission support.
(8) Install exhaust pipe to manifold.
(9) Lower the vehicle.
(10) Remove engine lifting fixture.
(11) Install the generator.
(12) Install starter motor.
(13) Connect power steering hoses, if equipped.
(14) Connect air conditioning hoses.
(15) Evacuate and charge the air conditioning sys-
tem, if equipped.
(16) Using a new gasket, install throttle body.
Tighten the throttle body bolts to 23 N´m (200 in.
lbs.) torque.
(17) Connect the accelerator linkage.
(18) Connect the starter wires.
(19) Connect the oil pressure wire.
(20) Install the distributor cap and wiring.
(21) Connect the vacuum lines.
(22) Connect the fuel lines.
(23) Install the radiator. Connect the radiator
hoses and heater hoses.
(24) Install fan shroud in position.
(25) Fill cooling system.
(26) Install the air cleaner assembly and air inlet
hose.
(27) Install the battery.
(28) Warm engine and adjust.
(29) Install hood and line up with the scribe
marks.
(30) Road test vehicle.
Fig. 39 Rear InsulatorÐ4WD Vehicles
1 ± AUTOMATIC TRANSMISSION
2 ± INSULATOR BRACKET
3 ± INSULATOR
4 ± CROSSMEMBER
9 - 162 5.9L ENGINEDN
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine INTAKE MANIFOLD
REMOVAL
(1) Disconnect the battery negative cable.
(2) Drain the cooling system. Refer to COOLING
SYSTEM.
(3) Remove the A/C compressor. Refer to HEAT-
ING and AIR CONDITIONING.
(4) Remove the generator. Refer to CHARGING
SYSTEM.
(5) Remove the accessory drive bracket.
(6) Remove the air cleaner assembly and air inlet
hose.
(7) Perform the fuel pressure release procedure.
Refer to FUEL SYSTEM.
(8) Disconnect the fuel supply line from the fuel
rail. Refer to FUEL SYSTEM.
(9) Disconnect the accelerator linkage and, if so
equipped, the speed control and transmission kick-
down cables.
(10) Remove the distributor cap and wires.
(11) Disconnect the coil wires.
(12) Disconnect the coolant temperature sending
unit wire.
(13) Disconnect the heater hoses and bypass hose.
(14) Remove the closed crankcase ventilation and
evaporation control systems.
(15) Remove intake manifold bolts.
(16) Lift the intake manifold and throttle body out
of the engine compartment as an assembly.
(17) Remove and discard the flange side gaskets
and the front and rear cross-over gaskets.
(18) Remove the throttle body bolts and lift the
throttle body off the intake manifold (Fig. 40). Dis-
card the throttle body gasket.
INSTALLATION
(1) If the plenum pan was removed, position pan
gasket and pan.
(2) Install plenum pan retaining bolts. (Fig. 41).
(3) Tighten plenum pan mounting bolts as follows:
²Step 1. Tighten bolts to 5.4 N´m (24 in. lbs.)
²Step 2. Tighten bolts to 9.5 N´m (84 in. lbs.)
²Step 3. Check all bolts are at 9.5 N´m (84 in.
lbs.)
(4) Using a new gasket, install the throttle body
onto the intake manifold. Tighten the bolts to 23 N´m
(200 in. lbs.) torque.
(5) Apply a bead of Mopar Silicone Rubber Adhe-
sive Sealant, or equivalent, to the four corner joints.
The sealant bead height should be slightly higher
than the cross-over gaskets, approximately 5 mm (0.2
in). An excessive amount of sealant is not required to
ensure a leak proof seal, and an excessive amount of
sealant may reduce the effectiveness of the flange
gasket.
(6) Install the front and rear cross-over gaskets
onto the engine (Fig. 42).
(7) Install the flange gaskets. Ensure that the ver-
tical port alignment tab is resting on the deck face of
the block. Also the horizontal alignment tabs must be
in position with the mating cylinder head gasket tabs
(Fig. 43). The words MANIFOLD SIDE should be vis-
ible on the center of each flange gasket.
(8) Carefully lower intake manifold into position
on the cylinder block and cylinder heads. long studs
at the front and rear of the manifold will help to
align the intake manifold. After intake manifold is in
Fig. 40 Throttle Body Assembly
1 ± FUEL RAIL ASSEMBLY
2 ± FUEL RAIL MOUNTING BOLTS
3 ± FUEL RAIL CONNECTING HOSES
Fig. 41 Plenum Pan Bolt Tightening Sequence
DN5.9L ENGINE 9 - 163
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine place, inspect to make sure seals are in place.
Remove alignment studs if used.
(9) The following torque sequence duplicates the
expected results of the automated assembly system
(Fig. 44).
²Step 1ÐTighten bolts 1 thru 4, in sequence, to 8
N´m (72 in. lbs.) torque. Tighten in alternating steps
1.4 N´m (12 in. lbs.) torque at a time.
²Step 2ÐTighten bolts 5 thru 12, in sequence, to
8 N´m (72 in. lbs.) torque.
²Step 3ÐCheck that all bolts are tightened to 8
N´m (72 in. lbs.) torque.
²Step 4ÐTighten all bolts, in sequence, to 16 N´m
(12 ft. lbs.) torque.
²Step 5ÐCheck that all bolts are tightened to 16
N´m (12 ft. lbs.) torque.
(10) Install closed crankcase ventilation and evap-
oration control systems.
(11) Install the coil wires.
(12) Connect the coolant temperature sending unit
wire.
(13) Connect the heater hoses and bypass hose.
(14) Install distributor cap and wires.
(15) Connect the accelerator linkage and, if so
equipped, the speed control and transmission kick-
down cables.
(16) Install the fuel supply line to the fuel rail.
(17) Install the accessory drive bracket and A/C
compressor.(18) Install the generator and accessory drive belt.
Tighten generator mounting bolt to 41 N´m (30 ft.
lbs.) torque.
(19) Install the air cleaner assembly and air inlet
hose.
(20) Fill cooling system.
(21) Connect the battery negative cable.
Fig. 42 Cross-Over Gaskets
1 ± FRONT CROSS-OVER GASKET
2 ± REAR CROSS-OVER GASKET
Fig. 43 Intake Manifold Flange Gasket Alignment
1 ± FLANGE GASKET
2 ± ALIGNMENT TABS
3 ± CYLINDER HEAD GASKET
Fig. 44 Intake Manifold Bolt Tightening SequenceÐ
5.9L Engine
9 - 164 5.9L ENGINEDN
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine CYLINDER HEAD
REMOVAL
(1) Disconnect the battery negative cable.
(2) Drain cooling system Refer to COOLING SYS-
TEM.
(3) Remove the intake manifold-to-generator
bracket support rod. Remove the generator.
(4) Remove closed crankcase ventilation system.
(5) Disconnect the evaporation control system.
(6) Remove the air cleaner assembly and air inlet
hose.
(7) Perform fuel system pressure release proce-
dure. Refer to FUEL SYSTEM.
(8) Disconnect the fuel supply line.
(9) Disconnect accelerator linkage and if so
equipped, the speed control and transmission kick-
down cables.
(10) Remove distributor cap and wires.
(11) Disconnect the coil wires.
(12) Disconnect heat indicator sending unit wire.
(13) Disconnect heater hoses and bypass hose.
(14) Remove cylinder head covers and gaskets.
(15) Remove intake manifold and throttle body as
an assembly. Discard the flange side gaskets and the
front and rear cross-over gaskets.
(16) Remove exhaust manifolds.
(17) Remove rocker arm assemblies and push rods.
Identify to ensure installation in original locations.
(18) Remove the head bolts from each cylinder
head and remove cylinder heads. Discard the cylin-
der head gasket.
(19) Remove spark plugs.
INSTALLATION
(1) Position the new cylinder head gaskets onto
the cylinder block.
(2) Position the cylinder heads onto head gaskets
and cylinder block.
(3) Starting at top center, tighten all cylinder head
bolts, in sequence, to 68 N´m (50 ft. lbs.) torque (Fig.
50). Repeat procedure, tighten all cylinder head bolts
to 143 N´m (105 ft. lbs.) torque. Repeat procedure to
confirm that all bolts are at 143 N´m (105 ft. lbs.)
torque.
CAUTION: When tightening the rocker arm bolts,
make sure the piston in that cylinder is NOT at
TDC. Contact between the valves and piston could
occur.
(4) Install push rods and rocker arm assemblies in
their original position. Tighten the bolts to 28 N´m
(21 ft. lbs.) torque.
(5) Install the intake manifold and throttle body
assembly.(6) Install exhaust manifolds. Tighten the bolts
and nuts to 34 N´m (25 ft. lbs.) torque.
(7) Adjust spark plugs to specifications. Refer to
IGNITION SYSTEM. Install the plugs and tighten to
41 N´m (30 ft. lbs.) torque.
(8) Install coil wires.
(9) Connect heat indicator sending unit wire.
(10) Connect the heater hoses and bypass hose.
(11) Install distributor cap and wires.
(12) Connect the accelerator linkage and if so
equipped, the speed control and transmission kick-
down cables.
(13) Install the fuel supply line.
(14) Install the generator and drive belt. Tighten
generator mounting bolt to 41 N´m (30 ft. lbs.)
torque.
(15) Install the intake manifold-to-generator
bracket support rod. Tighten the bolts.
(16) Place the cylinder head cover gaskets in posi-
tion and install cylinder head covers. Tighten the
bolts to 11 N´m (95 in. lbs.) torque.
(17) Install closed crankcase ventilation system.
(18) Connect the evaporation control system.
(19) Install the air cleaner assembly and air inlet
hose.
(20) Install the heat shields. Tighten the bolts to
41 N´m (30 ft. lbs.) torque.
(21) Fill cooling system.
(22) Connect the battery negative cable.
VALVES AND VALVE SPRINGS
REMOVAL
(1) Remove the cylinder head.
(2) Compress valve springs using Valve Spring
Compressor Tool MD- 998772A.
(3) Remove valve retaining locks, valve spring
retainers, valve stem seals and valve springs.
Fig. 50 Cylinder Head Bolt Tightening Sequence
DN5.9L ENGINE 9 - 167
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine (4) Before removing valves, remove any burrs from
valve stem lock grooves to prevent damage to the
valve guides. Identify valves to ensure installation in
original location.
INSTALLATION
(1) Coat valve stems with lubrication oil and insert
them in cylinder head.
(2) If valves or seats are reground, check valve
stem height. If valve is too long, replace cylinder
head.
(3) Install new seals on all valve guides. Install
valve springs and valve retainers.
(4) Compress valve springs with Valve Spring
Compressor Tool MD-998772A, install locks and
release tool. If valves and/or seats are ground, mea-
sure the installed height of springs. Make sure the
measurement is taken from bottom of spring seat in
cylinder head to the bottom surface of spring
retainer. If spacers are installed, measure from the
top of spacer. If height is greater than 42.86 mm
(1-11/16 inches), install a 1.587 mm (1/16 inch)
spacer in head counterbore. This should bring spring
height back to normal 41.27 to 42.86 mm (1-5/8 to
1-11/16 inch).
HYDRAULIC TAPPETS
REMOVAL
(1) Remove the air cleaner assembly and air inlet
hose.
(2) Remove cylinder head cover, rocker assembly
and push rods. Identify push rods to ensure installa-
tion in original location.
(3) Remove intake manifold, yoke retainer and
aligning yokes.
(4) Slide Hydraulic Tappet Remover/Installer Tool
C-4129-A through opening in cylinder head and seat
tool firmly in the head of tappet.
(5) Pull tappet out of bore with a twisting motion.
If all tappets are to be removed, identify tappets to
ensure installation in original location.
INSTALLATION
(1) If the tappet or bore in cylinder block is scored,
scuffed, or shows signs of sticking, ream the bore to
next oversize. Replace with oversize tappet.
(2) Lubricate tappets.
(3) Install tappets and push rods in their original
positions. Ensure that the oil feed hole in the side of
the tappet body faces up (away from the crankshaft).
(4) Install aligning yokes with ARROW toward
camshaft.
(5) Install yoke retainer. Tighten the bolts to 23
N´m (200 in. lbs.) torque. Install intake manifold.
(6) Install push rods in original positions.(7) Install rocker arm.
(8) Install cylinder head cover.
(9) Install air cleaner assembly and air inlet hose.
(10) Start and operate engine. Warm up to normal
operating temperature.
CAUTION: To prevent damage to valve mechanism,
engine must not be run above fast idle until all
hydraulic tappets have filled with oil and have
become quiet.
VIBRATION DAMPER
REMOVAL
(1) Disconnect the battery negative cable.
(2) Remove the cooling system fan.
(3) Remove the cooling fan shroud.
(4) Remove the accessory drive belt. Refer to
COOLING SYSTEM.
(5) Remove vibration damper bolt and washer from
end of crankshaft.
(6) Position Special Tool 8513 Insert into the
crankshaft nose.
(7) Install Special Tool 1026 Three Jaw Puller onto
the vibration damper (Fig. 51).
(8) Pull vibration damper off of the crankshaft.
INSTALLATION
CAUTION: Thoroughly remove any contaminants
from the crankshaft nose and the vibration damper
bore. Failure to do so can cause sever damage to
the crankshaft.
(1) Position the vibration damper onto the crank-
shaft.
Fig. 51 Vibration Damper Removal
1 ± SPECIAL TOOL 8513 INSERT
2 ± SPECIAL TOOL 1026
9 - 168 5.9L ENGINEDN
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine (2) Place installing tool, part of Puller Tool Set
C-3688 in position and press the vibration damper
onto the crankshaft (Fig. 52).
(3) Install the crankshaft bolt and washer. Tighten
the bolt to 244 N´m (180 ft. lbs.) torque.
(4) Install the accessory drive belt.
(5) Position the fan shroud and install the bolts.
Tighten the retainer bolts to 11 N´m (95 in. lbs.)
torque.
(6) Install the cooling fan.
(7) Connect the battery negative cable.
TIMING CHAIN COVER
(1) Disconnect the negative cable from the battery.
(2) Drain cooling system (refer to Group 7, Cooling
System).
(3) Remove the serpentine belt (refer to Group 7,
Cooling System).
(4) Remove water pump (refer to Group 7, Cooling
System).
(5) Remove power steering pump (refer to Group
19, Steering).
(6) Remove vibration damper.
(7) Remove fuel lines (refer to Group 14, Fuel Sys-
tem).
(8) Loosen oil pan bolts and remove the front bolt
at each side.
(9) Remove the cover bolts.
(10) Remove chain case cover and gasket using
extreme caution to avoid damaging oil pan gasket.
(11) Place a suitable tool behind the lips of the oil
seal to pry the oil seal outward. Be careful not to
damage the crankshaft seal surface of cover (Fig. 53).
INSTALLATION
(1) Be sure mating surfaces of chain case cover
and cylinder block are clean and free from burrs.
(2) The water pump mounting surface must be
cleaned.(3) Using a new cover gasket, carefully install
chain case cover to avoid damaging oil pan gasket.
Use a small amount of Mopar Silicone Rubber Adhe-
sive Sealant, or equivalent, at the joint between tim-
ing chain cover gasket and the oil pan gasket. Finger
tighten the timing chain cover bolts at this time.
(4) Place the smaller diameter of the oil seal over
Front Oil Seal Installation Tool 6635 (Fig. 54). Seat
the oil seal in the groove of the tool.
(5) Position the seal and tool onto the crankshaft
(Fig. 55).
(6) Tighten the 4 lower chain case cover bolts to
13N´m (10 ft.lbs.) to prevent the cover from tipping
during seal installation.
(7) Using the vibration damper bolt, tighten the
bolt to draw the seal into position on the crankshaft
(Fig. 56).
(8) Loosen the 4 bolts tightened in step 4 to allow
realignment of front cover assembly.
(9) Tighten chain case cover bolts to 41 N´m (30 ft.
lbs.) torque. Tighten oil pan bolts to 24 N´m (215 in.
lbs.) torque.
Fig. 52 Vibration Damper Installation
1 ± SPECIAL TOOL C-3688
Fig. 53 Removal of Front Crankshaft Oil Seal
Fig. 54 Placing Oil Seal on Installation Tool 6635
1 ± CRANKSHAFT FRONT OIL SEAL
2 ± INSTALL THIS END INTO SPECIAL TOOL 6635
DN5.9L ENGINE 9 - 169
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine (10) Remove the vibration damper bolt and seal
installation tool.
(11) Install vibration damper.(12) Install water pump and housing assembly
using new gaskets (refer to Group 7, Cooling Sys-
tem). Tighten bolts to 41 N´m (30 ft. lbs.) torque.
(13) Install power steering pump (refer to Group
19, Steering).
(14) Install the serpentine belt (refer to Group 7,
Cooling System).
(15) Install the cooling system fan. Tighten the
bolts to 23 N´m (17 ft. lbs.) torque.
(16) Position the fan shroud and install the bolts.
Tighten the bolts to 11 N´m (95 in. lbs.) torque.
(17) Fill cooling system (refer to Group 7, Cooling
System for the proper procedure).
(18) Connect the negative cable to the battery.
TIMING CHAIN
REMOVAL
(1) Disconnect battery negative cable.
(2) Remove Timing Chain Cover. Refer to Timing
Chain Cover in this section for correct procedure.
(3) Re-install the vibration damper bolt finger
tight. Using a suitable socket and breaker bar, rotate
the crankshaft to align timing marks as shown in
(Fig. 57).
(4) Remove camshaft sprocket attaching bolt and
remove timing chain with crankshaft and camshaft
sprockets.
INSTALLATION
(1) Place both camshaft sprocket and crankshaft
sprocket on the bench with timing marks on exact
imaginary center line through both camshaft and
crankshaft bores.
(2) Place timing chain around both sprockets.
(3) Turn crankshaft and camshaft to line up with
keyway location in crankshaft sprocket and in cam-
shaft sprocket.
(4) Lift sprockets and chain (keep sprockets tight
against the chain in position as described).
(5) Slide both sprockets evenly over their respec-
tive shafts and use a straightedge to check alignment
of timing marks (Fig. 57).
(6) Install the camshaft bolt. Tighten the bolt to 68
N´m (50 ft. lbs.) torque.
(7) Check camshaft end play. The end play should
be 0.051-0.152 mm (0.002-0.006 inch) with a new
thrust plate and up to 0.254 mm (0.010 inch) with a
used thrust plate. If not within these limits install a
new thrust plate.
(8) Install the timing chain cover.
CAMSHAFT
NOTE: The camshaft has an integral oil pump and
distributor drive gear (Fig. 58).
Fig. 55 Position Tool and Seal onto Crankshaft
1 ± SPECIAL TOOL 6635
2 ± OIL SEAL
3 ± TIMING CHAIN COVER
Fig. 56 Installing Oil Seal
1 ± SPECIAL TOOL 6635
2 ± TIMING CHAIN COVER
9 - 170 5.9L ENGINEDN
REMOVAL AND INSTALLATION (Continued)