Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual — part 499
DURE). Be careful not to gouge or scratch the alumi-
num head sealing surface.
Clean all engine oil passages.
INSPECTION
(1)
Cylinder head must be flat within 0.1 mm
(0.004 in.) (Fig. 12).
(2)
Inspect camshaft bearing journals for scoring.
(3) Remove carbon and varnish deposits from
inside of valve guides with a reliable guide cleaner.
(4) Using a small hole gauge and a micrometer,
measure valve guides in 3 places top, middle and bot-
tom (Fig. 13). (Refer to 9 - ENGINE - SPECIFICA-
TIONS) Replace guides if they are not within
specification.
(5) Check valve guide height (Fig. 14).
INSTALLATION - CYLINDER HEAD
NOTE: The Cylinder head bolts should be examined
BEFORE reuse. If the threads are necked down, the
bolts must be replaced (Fig. 15).
Necking can be checked by holding a scale or
straight edge against the threads. If all the threads
do not contact the scale, the bolt should be replaced.
(1) Before installing the bolts, the threads should
be coated with engine oil.
(2) Position cylinder head gasket on block.
(3) Install cyllinder head on block.
(4) On Non-PZEV equiped engines tighten the
cylinder head bolts in the sequence shown in (Fig.
16). Using the 4 step torque turn method, tighten
according to the following values:
• First: All to 34 N·m (25 ft. lbs.)
• Second: All to 68 N·m (50 ft. lbs.)
• Third: All to 68 N·m (50 ft. lbs.)
Fig. 12 Checking Cylinder Head Flatness
1 - FEELER GAUGE
2 - STRAIGHT EDGE
Fig. 13 Checking Wear on Valve Guide—Typical
1 - TOP
2 - MIDDLE
3 - BOTTOM
4 - CUT AWAY VIEW OF VALVE GUIDE MEASUREMENT
LOCATIONS
Fig. 14 Valve Guide Height
1 - VALVE GUIDE
2 - 13.25 - 13.75 MM (0.521 - 0.541 IN.)
3 - SPRING SEAT
Fig. 15 Checking Bolts for Stretching (Necking)
1 - STRETCHED BOLT
2 - THREADS ARE NOT STRAIGHT ON LINE
3 - THREADS ARE STRAIGHT ON LINE
4 - UNSTRETCHED BOLT
JR
ENGINE 2.4L DOHC
9 - 99
CYLINDER HEAD (Continued)
CAUTION: Do not use a torque wrench for the
Fourth step.
• Fourth: Turn all bolts an additional 1/4
Turn
(5) On PZEV equiped engines tighten the cylin-
der head bolts in the sequence shown in (Fig. 16).
Using the 4 step torque turn method, tighten accord-
ing to the following values:
• First: All to 34 N·m (25 ft. lbs.)
• Second: All to 82 N·m (60 ft. lbs.)
• Third: All to 82 N·m (60 ft. lbs.)
CAUTION: Do not use a torque wrench for the
Fourth step.
• Fourth: Turn all bolts an additional 1/4
Turn
(6) Install rocker arms and camshafts (Refer to 9 -
ENGINE/CYLINDER
HEAD/CAMSHAFT(S)
-
INSTALLATION).
(7) Install cylinder head cover (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - INSTALLATION).
(8) Install rear timing belt cover and timing belt
idler pulley (Refer to 9 - ENGINE/VALVE TIMING/
TIMING BELT / CHAIN COVER(S) - INSTALLA-
TION).
(9) Install
camshaft
sprockets
(Refer
to
9
-
ENGINE/VALVE
TIMING/TIMING
BELT/CHAIN
AND SPROCKETS - INSTALLATION).
(10)
Install timing belt (Refer to 9 - ENGINE/
VALVE
TIMING/TIMING
BELT/CHAIN
AND
SPROCKETS - INSTALLATION).
(11) Install upper and lower timing belt covers
(Refer to 9 - ENGINE/VALVE TIMING/TIMING
BELT / CHAIN COVER(S) - INSTALLATION).
(12) Install
crankshaft
damper
(Refer
to
9
-
ENGINE/ENGINE BLOCK/VIBRATION DAMPER -
INSTALLATION).
(13) Install accessory drive belts (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
INSTALLATION).
(14) Connect exhaust pipe to exhaust manifold.
Torque fasteners to 28 N·m (250 in. lbs.).
(15) Connect air injection connector tube to check
valve.
(16) Connect camshaft position sensor electrical
connector.
(17) Connect EGR solenoid electrical connector.
(18) Install heater tube support bracket to cylinder
head.
(19) Connect heater hose to thermostat housing.
(20) Install intake manifold (Refer to 9 - ENGINE/
MANIFOLDS/INTAKE MANIFOLD - INSTALLA-
TION).
(21) Install throttle body air inlet hose and air
cleaner housing assembly.
(22) Fill cooling system (Refer to 7 - COOLING/
ENGINE - STANDARD PROCEDURE).
(23) Connect negative battery cable.
CAMSHAFT OIL SEAL(S)
REMOVAL
(1) Remove timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
REMOVAL).
(2) Hold each camshaft sprocket with Special Tool
6847 while removing center bolt (Fig. 17).
(3) Remove camshaft sprockets.
(4) Remove rear timing belt cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT COVER(S)
- REMOVAL).
(5) Remove
camshaft
seal
using
Special
Tool
C-4679A (Fig. 18).
CAUTION: Do not nick shaft seal surface or seal
bore.
INSTALLATION
(1) Shaft seal surface must be free of varnish, dirt
or nicks. Polish with 400 grit paper if necessary.
(2) Install camshaft seals into cylinder head using
Special Tool MD-998306 until flush with head (Fig.
19).
(3) Install timing belt rear cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT COVER(S)
- INSTALLATION).
(4) Install camshaft sprockets. Hold each sprocket
with Special Tool 6847 and tighten center bolt to 115
N·m (85 ft. lbs.) (Fig. 17).
Fig. 16 Cylinder Head Tightening Sequence
9 - 100
ENGINE 2.4L DOHC
JR
CYLINDER HEAD (Continued)
(5) Install timing belt and front covers (Refer to 9 -
ENGINE/VALVE
TIMING/TIMING
BELT
AND
SPROCKETS
-
INSTALLATION)
(Refer
to
9
-
ENGINE/VALVE TIMING/TIMING BELT COVER(S)
- INSTALLATION).
CAMSHAFT(S)
DESCRIPTION
Both camshafts have six bearing journal surfaces
and two cam lobes per cylinder (Fig. 20). Flanges at
the rear journals control camshaft end play. Provision
for a cam position sensor is located on the intake
camshaft on the rear of the cylinder head. A hydro-
dynamic oil seal is used for oil control at the front of
the camshaft.
OPERATION
The camshaft is driven by the crankshaft via drive
sprockets and belt. The camshaft has precisely
machined lobes to provide accurate valve timing and
duration.
Fig. 17 Camshaft Sprocket - Removal/Installation
1 - SPECIAL TOOL 6847
Fig. 18 Camshaft Oil Seal - Removal With C-4679A
1 - SPECIAL TOOL C-4679
Fig. 19 Camshaft Seal - Installation
1 - SPECIAL TOOL MD-998306
Fig. 20 Camshafts
1 - CAMSHAFT BEARING CAPS
2 - PLUG
3 - CAMSHAFT
4 - CYLINDER HEAD
5 - CAMSHAFT OIL SEAL
JR
ENGINE 2.4L DOHC
9 - 101
CAMSHAFT OIL SEAL(S) (Continued)
STANDARD PROCEDURE
MEASURING CAMSHAFT END PLAY
(1) Oil camshaft journals and install camshaft
WITHOUT rocker arms. Install rear cam caps and
tighten screws to specified torque.
(2) Using a suitable tool, move camshaft as far
rearward as it will go.
(3) Zero dial indicator (Fig. 21).
(4) Move camshaft as far forward as it will go.
(5) Record reading on dial indicator. For end play
specification, (Refer to 9 - ENGINE - SPECIFICA-
TIONS).
(6) If end play is excessive, check cylinder head
and camshaft for wear; replace as necessary.
REMOVAL
(1) Remove cylinder head cover (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER - REMOVAL).
(2) Remove camshaft position sensor and camshaft
target magnet (Refer to 8 - ELECTRICAL/IGNITION
CONTROL/CAMSHAFT
POSITION
SENSOR
-
REMOVAL).
(3) Remove timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
REMOVAL).
(4) Remove camshaft sprockets and timing belt
rear cover (Refer to 9 - ENGINE/VALVE TIMING/
TIMING BELT COVER(S) - REMOVAL).
(5) Bearing
caps
are
identified
for
location.
Remove the outside bearing caps first (Fig. 22).
(6)
Loosen the camshaft bearing cap attaching
fasteners in sequence shown (Fig. 23) one camshaft
at a time.
CAUTION: Camshafts are not interchangeable. The
intake cam number 6 thrust bearing face spacing is
wider.
(7) Identify the camshafts before removing from
the head. The camshafts are not interchangeable.
(8) Remove camshafts from cylinder head.
NOTE: If removing rocker arms, identify for reinstal-
lation in the original position.
CLEANING
Clean camshaft with a suitable solvent.
INSPECTION
(1) Inspect camshaft bearing journals for damage
and binding (Fig. 24). If journals are binding, check
the cylinder head for damage. Also check cylinder
head oil holes for clogging.
(2) Check the cam lobe and bearing surfaces for
abnormal wear and damage. Replace camshaft if
defective.
NOTE: If camshaft is replaced due to lobe wear or
damage, always replace the rocker arms.
Fig. 21 Camshaft End Play - Typical
Fig. 22 Camshaft Bearing Cap Identification
Fig. 23 Camshaft Bearing Cap - Removal
1 - REMOVE OUTSIDE BEARING CAPS FIRST
9 - 102
ENGINE 2.4L DOHC
JR
CAMSHAFT(S) (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст