Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual — part 500
(3) Measure the lobe actual wear (unworn area -
wear zone = actual wear) (Fig. 24) and replace cam-
shaft if out of limit. Standard value is 0.0254 mm
(0.001 in.), wear limit is 0.254 mm (0.010 in.).
INSTALLATION
CAUTION: Ensure that NONE of the pistons are at
top dead center when installing the camshafts.
(1) Lubricate all camshaft bearing journals, rocker
arms and camshaft lobes.
(2) Install all rocker arms in original positions, if
reused.
(3) Position camshafts on cylinder head bearing
journals. Install right and left camshaft bearing caps
No. 2 – 5 and right No. 6. Tighten M6 fasteners to 12
N·m (105 in. lbs.) in sequence shown in (Fig. 25).
(4) Apply Mopar
t Gasket Maker to No. 1 and No.
6 bearing caps (Fig. 26). Install bearing caps and
tighten M8 fasteners to 28 N·m (250 in. lbs.).
NOTE: Bearing end caps must be installed before
seals can be installed.
(5) Install
camshaft
oil
seals
(Refer
to
9
-
ENGINE/CYLINDER
HEAD/CAMSHAFT
OIL
SEAL(S) - INSTALLATION).
(6) Install camshaft target magnet and camshaft
position sensor.
(7) Install cylinder head cover (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER - INSTALLATION).
(8) Install timing belt rear cover and camshaft
sprockets (Refer to 9 - ENGINE/VALVE TIMING/
TIMING BELT COVER(S) - INSTALLATION).
(9) Install timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
INSTALLATION).
CYLINDER HEAD COVER
REMOVAL
(1) Remove ignition coil and plug wires (Fig. 27).
Remove ground strap.
(2) Remove the cylinder head cover fasteners.
(3) Remove cylinder head cover from cylinder
head.
CLEANING
Clean cylinder head and cover mating surfaces
using a suitable solvent.
INSPECTION
Inspect cover rails for flatness.
Fig. 24 Checking Camshaft(s) for Wear
1 - UNWORN AREA
2 - ACTUAL WEAR
3 - BEARING JOURNAL
4 - LOBE
5 - WEAR ZONE
Fig. 25 Camshaft Bearing Cap Tightening Sequence
Fig. 26 Camshaft Bearing Cap Sealing
1 - 1.5 mm (.060 in.) DIAMETER BEAD OF MOPAR GASKET
MAKER
JR
ENGINE 2.4L DOHC
9 - 103
CAMSHAFT(S) (Continued)
INSTALLATION
NOTE: Replace spark plug well seals when install-
ing a new cylinder head cover gasket.
(1)
Install new cylinder head cover gaskets and
spark plug seals (Fig. 28).
CAUTION: Do not allow oil or solvents to contact
the timing belt as they can deteriorate the rubber
and cause tooth skipping.
(2)
Apply Mopar
t Engine RTV GEN II at the
camshaft cap corners and at the top edge of the 1/2
round seal.
(3)
Install cylinder head cover assembly to head
and tighten fasteners in sequence shown in (Fig. 29).
Using the 3 step torque method:
(a) Tighten all fasteners to 4.5 N·m (40 in. lbs.)
(b) Tighten all fasteners to 9.0 N·m (80 in. lbs.)
(c) Tighten all fasteners to 12 N·m (105 in. lbs.)
(4) Install ignition coil and plug wires. Tighten fas-
teners to 12 N·m (105 in. lbs.).
(5) Install ground strap.
HYDRAULIC LASH
ADJUSTERS
DIAGNOSIS AND TESTING
HYDRAULIC LASH ADJUSTER NOISE
DIAGNOSIS
A tappet-like noise may be produced from several
items. Check the following items.
(1) Engine oil level too high or too low. This may
cause aerated oil to enter the adjusters and cause
them to be spongy.
(2) Insufficient running time after rebuilding cylin-
der head. Low speed running up to 1 hour may be
required.
(3) During this time, turn engine off and let set for
a few minutes before restarting. Repeat this several
times after engine has reached normal operating
temperature.
(4) Low oil pressure.
(5) The oil restrictor (integral to the cylinder head
gasket) in the vertical oil passage to the cylinder
head is plugged with debris.
(6) Air ingested into oil due to broken or cracked
oil pump pick up.
(7) Worn valve guides.
(8) Rocker
arm
ears
contacting
valve
spring
retainer.
(9) Rocker arm loose, adjuster stuck or at maxi-
mum extension and still leaves lash in the system.
(10) Faulty lash adjuster.
• Check lash adjusters for sponginess while
installed in cylinder head. Depress part of rocker
Fig. 27 Ignition Coil and Ground Strap
1 - IGNITION COIL FASTENERS
2 - GROUND STRAP
Fig. 28 Cylinder Head Cover Gasket and Spark Plug
Seals
1 - ONE PIECE RUBBER GASKET
2 - SPARK PLUG WELL SEALS
Fig. 29 Cylinder Head Cover Tightening Sequence
9 - 104
ENGINE 2.4L DOHC
JR
CYLINDER HEAD COVER (Continued)
arm over adjuster. Normal adjusters should feel very
firm. Spongy adjusters can be bottomed out easily.
• Remove suspected lash adjusters, and replace as
necessary.
REMOVAL
NOTE: This procedure is for in-vehicle service with
camshafts installed.
(1) Remove cylinder head cover. (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - REMOVAL)
(2) Remove rocker arm. (Refer to 9 - ENGINE/
CYLINDER HEAD/ROCKER ARMS - REMOVAL)
(3) Remove hydraulic lash adjuster (Fig. 30).
(4) Repeat removal procedure for each hydraulic
lash adjuster.
(5) If reusing, mark each hydraulic lash adjuster
for reassembly in original position. Lash adjusters
are serviced as an assembly.
INSTALLATION
(1) Install
hydraulic
lash
adjuster
(Fig.
30).
Ensure the lash adjusters are at least partially full of
engine oil. This is indicated by little or no plunger
travel when the lifter is depressed.
(2) Install rocker arm. (Refer to 9 - ENGINE/CYL-
INDER HEAD/ROCKER ARMS - INSTALLATION)
(3) Repeat installation procedure for each hydrau-
lic lash adjuster.
(4) Install cylinder head cover. (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - INSTALLATION)
INTAKE/EXHAUST VALVES &
SEATS
DESCRIPTION
The valves are made of heat resistant steel. They
have chrome plated stems to prevent scuffing. Viton
rubber valve stem seals are integral with the spring
seats. The valves have three-bead lock keepers to
retain springs and to promote valve rotation.
OPERATION
The four valves per cylinder (two intake and two
exhaust) are opened by using roller rocker arms
which pivot on hydraulic lash adjusters.
CLEANING
(1) Clean
all
valves
thoroughly
and
discard
burned, warped and cracked valves.
ROCKER ARMS
REMOVAL
NOTE: This procedure is for in-vehicle service with
camshafts installed.
(1) Disconnect negative battery cable.
(2) Remove cylinder head cover. (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - REMOVAL)
(3) Remove spark plugs.
(4) Rotate engine until the camshaft lobe, on the
follower being removed, is positioned on its base cir-
cle (heel). Also, the piston should be a minimum of
6.3 mm (0.25 in) below TDC position.
CAUTION: If cam follower assemblies are to be
reused, always mark position for reassembly in
their original positions.
(5) Using Special Tools 8215-A and 8436 slowly
depress valve assembly until rocker arm can be
removed (Fig. 31).
(6) Repeat removal procedure for each rocker arm.
INSPECTION
Inspect the rocker arm for wear or damage (Fig.
32). Replace as necessary.
INSTALLATION
(1) Lubricate rocker arm with clean engine oil.
(2) Using Special Tools 8215-A and 8436 slowly
depress valve assembly until rocker arm can be
installed on the hydraulic lifter and valve stem (Fig.
31).
Fig. 30 Hydraulic Lash Adjuster
JR
ENGINE 2.4L DOHC
9 - 105
HYDRAULIC LASH ADJUSTERS (Continued)
(3) Repeat installation procedure for each rocker
arm.
(4) Install spark plugs.
(5) Install cylinder head cover. (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - INSTALLATION)
(6) Connect negative battery cable.
VALVE SPRINGS & SEALS
REMOVAL
REMOVAL - CYLINDER HEAD ON
(1) Disconnect negative battery cable.
(2) Remove timing belt (Refer to 9 - ENGINE/
VALVE
TIMING/TIMING
BELT/CHAIN
AND
SPROCKETS - REMOVAL).
(3) Remove cylinder head cover (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - REMOVAL).
(4) Remove camshafts (Refer to 9 - ENGINE/CYL-
INDER HEAD/CAMSHAFT(S) - REMOVAL).
(5) Rotate crankshaft until piston is at TDC.
(6) With air hose attached to adapter tool installed
in spark plug hole, apply 90-120 psi air pressure.
(7) Using Special Tool MD-998772-A with adapter
6779 (Fig. 33), compress valve springs and remove
valve locks.
(8) Remove valve spring(s).
(9) Remove valve stem seal(s) by a using valve
stem seal tool (Fig. 35).
CYLINDER HEAD OFF
(1) With cylinder head removed from cylinder
block, compress valve springs using a universal valve
spring compressor.
(2) Remove valve retaining locks, valve spring
retainers, valve stem seals and valve springs.
(3) Before removing valves, remove any burrs
from valve stem lock grooves to prevent dam-
age to the valve guides. Identify valves, locks and
retainers to insure installation in original location.
(4) Inspect the valves. (Refer to 9 - ENGINE/CYL-
INDER HEAD/VALVE SPRINGS - INSPECTION)
Fig. 31 Rocker Arm - Removal/Installation
1 - SPECIAL TOOL 8215-A
2 - SPECIAL TOOL 8436
3 - 3/8
9
DRIVE RACHET
Fig. 32 Rocker Arm
1 - TIP
2 - LASH ADJUSTER POCKET
3 - ROLLER
Fig. 33 Valve Spring - Removal/Installation
1 - VALVE SPRING COMPRESSOR MD 998772A
2 - AIR HOSE
9 - 106
ENGINE 2.4L DOHC
JR
ROCKER ARMS (Continued)
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