Dodge Neon / Neon SRT-4. Manual — part 257
![](/vehicles/wlang/sta/knessild/mys.png)
CYLINDER HEAD COVER
REMOVAL
(1) Disconnect negative battery cable.
(2) Disconnect ignition coil connector.
(3) Disconnect spark plug wires and remove igni-
tion coil (Fig. 37).
(4) Disconnect PCV and make-up air hoses from
cylinder head cover (Fig. 37).
(5) Unclip wiring harness from cylinder head cover
studs (Fig. 37).
(6) Remove
nut
securing
coolant
return
line
bracket to cylinder head cover stud (Fig. 38).
NOTE: For reassembly purposes, note location of
double ended studs.
(7) Remove cylinder head cover fasteners.
(8) Remove cylinder head cover from cylinder
head.
INSTALLATION
CAUTION: Do not allow oil or solvents to contact
the timing belt as they can deteriorate the rubber
and cause tooth skipping.
(1) Clean cylinder head cover sealing surface.
(2)
Install new cylinder head cover gasket (Fig.
39) and spark plug well seals (Fig. 40).
(3)
Apply Mopar
t Engine RTV GEN II at the
camshaft cap corners and at the top edges of the 1/2
round seal (Fig. 41).
NOTE: Inspect cylinder head cover fastener seal
washers. Replace as necessary.
(4)
Install cylinder head cover assembly to cylin-
der head. Install all fasteners, ensuring the double
ended studs are in their proper location. Tighten fas-
teners in sequence shown in (Fig. 42). Using a 3 step
torque method as follows:
(a) Tighten all bolts to 4.5 N·m (40 in. lbs.).
(b) Tighten all bolts to 9.0 N·m (80 in. lbs.).
Fig. 37 PCV/Make-up Air Hoses & Ignition Coil
1 - PCV HOSE
2 - IGNITION COIL
3 - MAKE-UP AIR HOSE
4 - WIRING HARNESS CLIPS
Fig. 38 Coolant Return Line Bracket
1 - NUT
2 - COOLANT RETURN LINE
3 - HOSE CLAMPS
Fig. 39 Cylinder Head Cover Gasket and Spark Plug
Well Seals
1 - SPARK PLUG WELL SEALS
2 - GASKET
9 - 122
ENGINE 2.4L DOHC TURBO
PL/SRT-4
![](/vehicles/wlang/sta/knessild/lelu.png)
(c) Tighten all bolts to 12 N·m (105 in. lbs.).
(5) Install nut securing coolant return line bracket
to cylinder head cover stud (Fig. 38).
(6) Clip wiring harness to cylinder head cover
studs (Fig. 37).
(7) Install ignition coil and connect spark plug
wires. Tighten ignition coil fasteners to 12 N·m (105
in. lbs.) (Fig. 37).
(8) Connect ignition coil connector.
(9) If the PCV valve was removed from cylinder
head cover, apply Mopar
t Thread Sealant with Teflon
to threads and install valve to cylinder head cover.
Tighten PCV valve to 8 N·m (70 in. lbs.).
(10) Connect PCV and make-up air hoses to cylin-
der head cover (Fig. 37).
(11) Connect negative battery cable.
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.
Fig. 40 Spark Plug Well Seals
Fig. 41 Sealer Locations
1 – SEALER LOCATION
Fig. 42 Cylinder Head Cover Tightening Sequence
PL/SRT-4
ENGINE 2.4L DOHC TURBO
9 - 123
CYLINDER HEAD COVER (Continued)
![](/vehicles/wlang/sta/knessild/jea.png)
(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
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. 43).
(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.
43).
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) Remove cylinder head cover. (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - REMOVAL)
(2) Remove spark plugs.
(3) 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.
(4) Using Special Tools 8215A and 8436 slowly
depress valve assembly until rocker arm can be
removed (Fig. 44).
(5) Repeat removal procedure for each rocker arm.
INSPECTION
Inspect the rocker arm for wear or damage (Fig.
45). Replace as necessary.
INSTALLATION
(1) Lubricate rocker arm with clean engine oil.
Fig. 43 Hydraulic Lash Adjuster
9 - 124
ENGINE 2.4L DOHC TURBO
PL/SRT-4
HYDRAULIC LASH ADJUSTERS (Continued)
![](/vehicles/wlang/sta/knessild/dou.png)
(2) Using Special Tools 8215A and 8436 slowly
depress valve assembly until rocker arm can be
installed on the hydraulic lifter and valve stem (Fig.
44).
(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)
VALVE SPRINGS & SEALS
REMOVAL
CYLINDER HEAD ON
(1) Remove cylinder head cover (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - REMOVAL).
(2) Remove camshafts (Refer to 9 - ENGINE/CYL-
INDER HEAD/CAMSHAFT(S) - REMOVAL).
(3) Rotate crankshaft until piston is at TDC on
compression.
(4) With air hose attached to adapter tool installed
in spark plug hole, apply 90-120 psi air pressure.
(5) Using Special Tool MD-998772-A with adapter
6779 (Fig. 46), compress valve springs and remove
valve locks.
(6) Remove valve spring(s).
(7) Remove valve stem seal(s) by a using valve
stem seal tool (Fig. 48).
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. 44 Rocker Arm - Removal/Installation
1 - SPECIAL TOOL 8215A
2 - SPECIAL TOOL 8436
3 - 3/8
9
DRIVE RACHET
Fig. 45 Rocker Arm
1 - TIP
2 - LASH ADJUSTER POCKET
3 - ROLLER
Fig. 46 Valve Spring - Removal/Installation
1 - VALVE SPRING COMPRESSOR MD 998772A
2 - AIR HOSE
PL/SRT-4
ENGINE 2.4L DOHC TURBO
9 - 125
ROCKER ARMS (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст