1996 CHRYSLER VOYAGER engine

VALVE SERVICE RECONDITION
(1) With suitable valve spring compressor, remove
spring retainer locks, retainer, valve spring, spring
seat and valve (Fig. 12).
(2) Remove valve stem seals with suitable tool
(Fig. 13). Do not reuse valve stem seals.
VALVES
(1) Check valve stem tip for pitting or depression
at point A (Fig. 14).
(2) Check for wear and ridge wear at Point B.
(3) Check for even contact (at face center) with
valve seat, Point C.
(4) Check margin (Fig. 14). Replace valve if mar-
gin is out of specification. Refer to Valve Specification
Chart.
(5) Check valve guide height (Fig. 15).
(6) Measure valve stem to guide clearance. Refer
to Valve Specification Chart.
(7) Measure Valve spring free length and square-
ness (Fig. 16). Refer to Valve Specification Chart.
Fig. 12 Remove Valves
Fig. 13 Remove Valve Stem Seals
Fig. 14 Valve Inspection
Fig. 15 Valve Guide Height
9 - 66 3.0L ENGINENS
SERVICE PROCEDURES (Continued)

VALVE SEAT
Inspect the valve seat with Prussian blue to deter-
mine where the valve contacts the seat. To do this,
coat valve seatLIGHTLYwith Prussian blue then
set valve in place. Rotate the valve with light pres-
sure. If the blue is transferred to the center of valve
face, contact is satisfactory. If the blue is transferred
to top edge of the valve face, lower valve seat with a
15 degrees stone. If the blue is transferred to the bot-
tom edge of valve face raise valve seat with a 65
degree stone (Fig. 17).
INSTALLATION
(1) Install valve spring seat.
(2) Using suitable tool install seal by tapping
lightly until seal is in place (Fig. 18).
(3) Install valve spring with the enamelled ends
facing the rocker arms (Fig. 19).
CAUTION: During reassembly, compressing the
valve spring more than necessary to install valve
spring retainer locks can cause the retainer to be
forced against the stem seal and damaging it.
VALVE SPECIFICATION CHART
Valve Dimensions
INTAKE VALVE (MINIMUM)
Stem Diameter: 7.960 mm (0.313 in.)
Face Angle: 45É
Valve Margin: 0.700 mm (0.028 in.)
Length: 103.0 mm (4.055 in.)
EXHAUST VALVE (MINIMUM)
Stem Diameter: 7.930 mm (0.312)
Face Angle: 45É
Valve Margin: 1.50 mm (0.059 in.)
Length: 102.70 mm (4.043 in.)
Valve Guide
ClearanceNew Service
Limit
Intake: 0.03 - 0.06 mm
(0.001 - 0.002 in.)0.10 mm
(0.004 in.)
Exhaust: 0.05 - 0.09 mm
(0.002 - 0.0035 in.)0.15 mm
(0.006 in.)
Valve Springs New Service
Limit
Free Length: 49.8 mm (1.960 in.) 48.8 mm
(1.921 in.)
Squarness: 2É Maximum 4É Maximum
Spring Tension: 33 Kg @ 40.4 mm
(73 lbs. @ 1.59 in.)
Fig. 16 Valve Spring
Fig. 17 Valve Seat Reconditioning
Fig. 18 Install Valve Stem Seals
Fig. 19 Installed Valve Spring Position
NS3.0L ENGINE 9 - 67
SERVICE PROCEDURES (Continued)

REMOVAL AND INSTALLATION
ENGINE MOUNTS
RIGHT SIDE MOUNT
REMOVAL
NOTE: Right mount should only be serviced as an
assembly to prevent noise, vibration and harshness
concerns.
(1) Remove the purge duty solenoid and wiring
harness from engine mount.
(2) Remove the two right engine mount insulator
vertical fasteners and loosen the horizontal fastener.
Do Not remove the large nut on the end of the
core from the frame rail (Fig. 20).
(3) Remove the load on the engine motor mounts
by carefully supporting the engine and transmission
assembly with a floor jack.
(4) Remove the vertical and horizontal fasteners
from the engine side bracket. Remove the engine
mount assembly
INSTALLATION
(1) Reverse removal procedure for installation.
Tighten assembly in the following order:
(a) Engine mount to rail fasteners to 68 N´m (50
ft. lbs.).
(b) The vertical engine fastener to 102 N´m (75
ft. lbs.).
(c) The horizontal fastener to 150 N´m (111 ft.
lbs.).
(2) Install the purge duty solenoid and wiring har-
ness to the engine mount.
(3) Engine mount adjustment, Refer to Engine
Mount Insulator Adjustment.
FRONT MOUNT
REMOVAL
(1) Support the engine and transmission assembly
with a floor jack so it will not rotate.
(2) Remove the front engine mount through bolt
from the insulator and front crossmember mounting
bracket (Fig. 21).
(3) Remove six screws from air dam to allow
access to the front mount screws.
(4) Remove the front engine mount screws and
remove the insulator assembly.
(5) Remove the front mounting bracket, if neces-
sary (Fig. 21).
INSTALLATION
(1) Reverse removal procedure for installation and
tighten fasteners in this order:
(a) Tighten bolts 2, 3, and 4 to 108 N´m (80 ft.
lbs.).
(b) Tighten bolts 1 and 5 to 54 N´m (40 ft. lbs.).
(2) Engine mount adjustment. Refer to Engine
Mount Insulator Adjustment of this section.
(3) Install six screws to air dam and tighten to 12
N´m (105 in. lbs.).
LEFT SIDE MOUNT
REMOVAL
(1) Raise vehicle on hoist and remove left front
wheel.
(2) Support the transmission with a transmission
jack.
(3) Remove the insulator through bolt from the
mount.
(4) Remove the transmission mount fasteners and
remove mount.
INSTALLATION
(1) Reverse removal procedure for installation.
Fig. 20 Engine MountÐRight
Fig. 21 Engine MountÐFront
9 - 68 3.0L ENGINENS

(2) Tighten mount to transmission bolts to 55 N´m
(40 ft. lbs.) (Fig. 22).
Tighten through bolt to 75 N´m (55 ft. lbs.)
(3) Engine mount adjustment, Refer to Engine
Mount Insulator Adjustment of this section.
REAR MOUNT
(1) Raise vehicle on hoist.
(2) Support the transmission with a transmission
jack so it will not rotate.
(3) Remove the insulator through bolt from the
mount and rear suspension crossmember.
(4) Remove the four transmission mount fasteners
and remove the mount.
(5) Reverse the removal procedure for installation.
Refer to (Fig. 23).
ENGINE MOUNT RUBBER INSULATORS
Insulator location on (right side) is adjustable to
allow right/left drive train adjustment in relation to
driveshaft assembly length. See Engine Mount
Adjustments in this section.
Check and reposition right engine mount insulator.
Adjust drive train position, if required, for the follow-
ing conditions:
²Driveshaft distress: See Group 2, Suspension
and Driveshafts.
²Any front end structural damage (after repair).
²Insulator replacement.
ENGINE ASSEMBLY
REMOVAL
(1) Perform fuel pressure release procedure. Refer
to Group 14, Fuel System for procedure. Remove fuel
line to fuel rail.
(2) Disconnect battery.
(3) Remove Air cleaner and hoses.
(4) Remove battery cover, battery and battery tray,
with integral vacuum reservoir, from vehicle.
(5) Block off heater hoses to rear heater assembly,
if equipped.
(6) Drain cooling system. Refer to Group 7, Cooling
System for procedure.
(7) Disconnect heater hoses.
(8) Remove fan module and radiator. Refer to
Group 7, Cooling System for procedure.
(9) Disconnect transmission shift linkage.
(10) Disconnect throttle body linkage and vacuum
hoses from throttle body.
(11) Remove accessory drive belts. Refer to Acces-
sory Drive System located in Group 7, Cooling Sys-
tem for procedure.
(12) Remove air conditioning compressor from
engine and set it aside.
(13) Disconnect generator wiring harness and
remove generator.
(14) Hoist vehicle and remove axle shafts. Refer to
Group 2, Driveshaft for procedure.
(15) Remove right and left inner splash shields.
(16) Disconnect exhaust pipe from manifold.
(17) Remove front engine mount and bracket as an
assembly.
(18) Remove rear transmission mount and bracket.
(19) Remove power steering pump and bracket
assembly.
(20) Remove wiring harness and connectors from
front of engine.
(21) Remove bending braces and install tool num-
ber 6910 on engine.
(22) Remove trans inspection cover and mark flex-
plate to torque converter.
(23) Remove driveplate to torque converter bolts.
(24) Lower the vehicle.
Fig. 22 Engine MountÐLeft
Fig. 23 Engine MountÐRear
NS3.0L ENGINE 9 - 69
REMOVAL AND INSTALLATION (Continued)

(25) Remove ground straps to body.
(26) Raise vehicle enough to allow engine dolly
Special Tool 6135 and cradle Special Tool 6710 with
post Special Tool 6848 and adaptor Special Tool 6909
to be installed under vehicle (Fig. 24).
(27) Loosen cradle engine mounts to allow move-
ment for positioning onto engine locating holes on the
engine. Lower vehicle and position cradle mounts
until the engine is resting on mounts. Tighten
mounts to cradle frame. This will keep mounts from
moving when removing or installing engine and
transmission.
(28) Lower vehicle so the weight ofONLY THE
ENGINE AND TRANSMISSIONis on the cradle.
(29) Remove right engine mount assembly and left
transmission mount through bolt. Refer to Engine
Mounts Section of this Group.
(30) Raise vehicle slowly. It may be necessary to
move the engine/transmission assembly on the cradle
to allow for removal around body flanges.
INSTALLATION
(1) Position engine and transmission assembly
under vehicle and slowly lower the vehicle over the
engine and transmission. It may be necessary to
move the engine/transmission assembly with the cra-
dle for clearance around body flanges.
(2) Align engine and transmission mounts to
attaching points. Install mounting bolts at the right
engine and left transmission mounts. Refer to proce-
dures outlined in this section.(3) Slowly raise vehicle enough to remove the
engine dolly and cradle Special Tools 6135, 6710,
6848 and 6909.
(4) Remove Special tools 6910 and install bending
braces.
(5) Lower vehicle. Install generator and wiring
harness.
(6) Connect wiring harness on the front of the
engine.
(7) Install Air Conditioning Compressor.
(8) Install power steering pump and bracket and
accessory drive belt. Refer to Group 7. Accessory
Drive Belts Section for installation procedure.
(9) Raise vehicle and install axle shafts. Refer to
Group 2, Driveshafts for procedure.
(10) Install transmission and engine mount and
bracket assemblies. Refer to Engine Mounts in this
section for procedure.
(11) Connect exhaust system to manifold. Refer to
Group 11, Exhaust System and Intake Manifold for
procedure and torque specifications.
(12) Install left and right inner splash shields.
(13) Connect automatic transmission shifter link-
age. Refer to Group 21, Transmission for procedures.
(14) Lower vehicle and connect fuel line and
heater hoses. Remove plugs from rear heater hoses
and install, if equipped.
(15) Install ground straps. Connect engine and
throttle body connections and harnesses.
(16) Connect throttle body linkage. Refer to Group
14, Fuel System for procedure.
(17) Install radiator and fan module assembly.
Install radiator hoses. Fill cooling system. Refer to
Group 7, Cooling for procedures.
(18) Install battery tray, battery and cover.
(19) Install air cleaner and hoses.
(20) Install oil filter. Fill engine crankcase with
proper oil to correct level.
(21) Start engine and run until operating temper-
ature is reached.
(22) Adjust transmission linkage, if necessary.
CYLINDER HEAD COVER
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove air inlet resonator when removing left
head cover.
(3) When Removing left cylinder head cover,
remove dipstick tube.
(4) When removing right cylinder head cover
remove wiper unit. Refer to Wiper Unit Removal in
Group 8K.
(5) When removing right cylinder head cover,
remove accessory drive belt. Refer to Accessory Drive
Belt Removal in Group 7.
Fig. 24 Positioning Engine Cradle Support Post
MountsÐTypical
9 - 70 3.0L ENGINENS
REMOVAL AND INSTALLATION (Continued)

(6) When removing right cylinder head cover, dis-
connect generator wiring and remove generator.
(7) Relocate spark plug wires.
(8) Remove vacuum connections.
(9) Remove rocker cover screws and remove cover
(Fig. 25).
INSTALLATION
(1) Clean cylinder head and cover mating surfaces.
Install new gasket.
(2) See (Fig. 25) and apply sealant such as Mopar
Silicone Rubber Adhesive Sealant to cover ends.
(3) Install cover and tighten cover bolt washer and
gasket assembly to 10 N´m (88 in. lbs.).
(4) Reverse removal procedures for installation.
CAMSHAFT
REMOVAL
NOTE: SEE AUTO LASH ADJUSTER FUNCTION
CHECK BEFORE DISASSEMBLY
(1) Install auto lash adjuster retainers (Fig. 26).
(2) Remove distributor adaptor (Fig. 27).
(3) When removing camshaft bearing caps do not
remove the bolts from the bearing caps. Remove the
rocker arm, rocker shafts and bearing cap as an
assembly.
CAMSHAFT INSPECTION
(1) Inspect camshaft bearing journals for damage
and binding (Fig. 28). If journals are binding, also
check the cylinder head for damage. Also check cyl-
inder head oil holes for clogging.
(2) Front cylinder head camshaft check the tooth
surface of the distributor drive gear teeth of the cam-
shaft and replace if abnormal wear is evident (Fig.
28).
(3) Check the cam surface for abnormal wear and
damage and replace if defective. Also measure the
cam height (Fig. 28) and replace if out of limit, stan-
dard value is 41.25 mm (1.624 in.), wearlimitis
40.75 mm (1.604 in.).
CAMSHAFT INSTALL
Lubricate camshaft journals and cams with engine
oil and install camshaft on cylinder head.
Fig. 25 Rocker Cover
Fig. 26 Auto Lash Adjuster Retainers
NS3.0L ENGINE 9 - 71
REMOVAL AND INSTALLATION (Continued)

ROCKER ARMS
INSTALL ROCKER ARM SHAFT ASSEMBLY
(1) Apply Mopar Silicone Rubber Adhesive Sealant
at bearing cap ends as shown in (Fig. 29).
(2) Install the rocker arm shaft assembly making
sure that the arrow mark on the bearing cap and the
arrow mark on the cylinder head are in the same
direction (Fig. 29).
NOTE: The direction of arrow marks on the front
and rear assemblies are opposite to each other.
(3) Tighten bearing cap bolts in the following order
to 10 N´m (85 in. lbs.). First #3, then #2, #1 and #4.
(4) Repeat step 3 increasing the torque to 20 N´m
(180 in.lbs.).
(5) Install distributor drive adaptor assembly (Fig.
30).
CAMSHAFT SEAL
CAMSHAFT END SEAL (PLUG)Ð IN VEHICLE
SERVICE
(1) Remove air cleaner assembly from engine.
(2) Use a small punch and a hammer, carefully
remove cam plug from cylinder head.
Fig. 27 Cylinder Heads and Camshafts
Fig. 28 Checking Camshafts
9 - 72 3.0L ENGINENS
REMOVAL AND INSTALLATION (Continued)

(3) Clean the area of the cylinder head where the
new cam plug will be installed.
(4)
Apply a light coating of Mopar Silicone Rubber
Adhesive Sealant to the outer diameter of the NEW cam
plug.
(5) Using a suitable installing tool and a hammer,
install the new cam plug to a depth of 0.5 mm (0.020
in.) below the surface of the cylinder head.
(6) Replace air cleaner assembly.
CAMSHAFT OIL SEAL PLUGÐ OUT OF
VEHICLE SERVICE
(1) Apply light coat of engine oil to the camshaft
oil seal lip.
(2) Install the oil seal using camshaft oil seal
installer tool MD-998713 (Fig. 31).
CAMSHAFT END SEAL (PLUG) SERVICE Ð
OUT OF VEHICLE SERVICE
Install end seal plug with Special Tool MD-998306
(Fig. 32).
Fig. 29 Rocker Arm Shaft Direction
Fig. 30 Distributor Drive
Fig. 31 Camshaft Oil SealÐInstallation
Fig. 32 Camshaft End Seal PlugÐInstallation
NS3.0L ENGINE 9 - 73
REMOVAL AND INSTALLATION (Continued)