exhaust DODGE NEON 2000 Service User Guide

ENGINE DIAGNOSISÐPERFORMANCE
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START 1. Weak battery. 1. Test battery. Charge or replace
as necessary. Refer to Group 8A,
Battery.
2. Corroded or loose battery
connections.2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to terminals.
3. Faulty starter. 3. Test starting system. Refer to
Group 8B, Starting.
4. Faulty coil(s) or control unit. 4. Test and replace as needed.
Refer to Group 8D, Ignition System.
5. Incorrect spark plug gap. 5. Set gap. Refer to Group 8D,
Ignition System.
6. Contamination in fuel system. 6. Clean system and replace fuel
filter.
7. Faulty fuel pump. 7. Test fuel pump and replace as
needed. Refer to Group 14, Fuel
System.
8. Incorrect engine timing. 8. Check for a skipped timing
belt/chain.
ENGINE STALLS OR IDLES
ROUGH1. Idle speed too low. 1. Test minimum air flow. Refer to
Group 14, Fuel System.
2. Incorrect fuel mixture. 2. Refer to Group 14, Fuel System.
3. Intake manifold leakage. 3. Inspect intake manifold, manifold
gasket, and vacuum hoses.
4. Faulty coil(s). 4. Test and replace as necessary.
Refer to Group 8D, Ignition System.
ENGINE LOSS OF POWER 1. Dirty or incorrectly gapped plugs. 1. Clean plugs and set gap. Refer to
Group 8D, Ignition System.
2. Contamination in fuel system. 2. Clean system and replace fuel
filter.
3. Faulty fuel pump. 3. Test and replace as necessary.
Refer to Group 14, Fuel System.
4. Incorrect valve timing. 4. Correct valve timing.
5. Leaking cylinder head gasket. 5. Replace cylinder head gasket.
6. Low compression. 6. Test compression of each
cylinder.
7. Burned, warped, or pitted valves. 7. Replace valves.
8. Plugged or restricted exhaust
system.8. Install new parts, as necessary.
9. Faulty coil(s). 9. Test and replace as necessary.
Refer to Group 8D, Ignition System.
PLENGINE 9 - 11
DIAGNOSIS AND TESTING (Continued)

2.0L SOHC ENGINE
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
ENGINE IDENTIFICATION..................15
ENGINE COMPONENTS...................15
ENGINE LUBRICATION SYSTEM.............17
DIAGNOSIS AND TESTING
CHECKING ENGINE OIL PRESSURE..........18
SERVICE PROCEDURES
CYLINDER BORE AND PISTON SIZING........18
FITTING PISTON RINGS...................19
FITTING CONNECTING RODS...............19
FITTING CRANKSHAFT BEARINGS...........19
CRANKSHAFT END PLAY..................20
REMOVAL AND INSTALLATION
TORQUE STRUTS........................20
ENGINE MOUNTÐLEFT...................21
ENGINE MOUNTÐRIGHT..................23
ENGINE MOUNT BRACKETÐRIGHT..........24
STRUCTURAL COLLAR....................25
ENGINE ASSEMBLY.......................25
INTAKE MANIFOLD.......................28
EXHAUST MANIFOLD.....................30
CYLINDER HEAD COVER..................31
SPARK PLUG TUBE SEALS.................32
SPARK PLUG TUBE.......................33
CAMSHAFT.............................33
ROCKER ARM/HYDRAULIC LASH ADJUSTER . . . 34
VALVE SEALS AND SPRINGSÐIN VEHICLE....36
CYLINDER HEAD.........................37
CRANKSHAFT DAMPER...................40
TIMING BELT COVERS....................41TIMING BELT............................43
TIMING BELT TENSIONER..................46
CAMSHAFT OIL SEAL.....................46
OILPAN................................47
CRANKSHAFT OIL SEALÐFRONT............48
CRANKSHAFT OIL SEALÐREAR.............50
DRIVE PLATE...........................51
CRANKSHAFT...........................52
OIL FILTER ADAPTER.....................55
OILFILTER .............................55
OIL PUMP..............................55
PISTON AND CONNECTING ROD............57
DISASSEMBLY AND ASSEMBLY
OIL PUMP..............................60
VALVE SERVICE WITH THE CYLINDER HEAD
REMOVED............................60
CLEANING AND INSPECTION
INTAKE MANIFOLD.......................63
EXHAUST MANIFOLD.....................63
CYLINDER HEAD AND CAMSHAFT
JOURNALS............................63
OIL PUMP..............................64
CYLINDER BLOCK AND BORE..............65
ADJUSTMENTS
ENGINE TORQUE STRUT ADJUSTMENT......66
SPECIFICATIONS
2.0L SOHC ENGINE.......................68
TORQUE...............................71
SPECIAL TOOLS
2.0L SOHC ENGINE.......................72
DESCRIPTION AND OPERATION
ENGINE IDENTIFICATION
The engine identification number is located on the
left rear of the cylinder block bedplate (Fig. 1).
ENGINE COMPONENTS
CYLINDER BLOCK AND BEDPLATE ASSEMBLY
A partial open deck is used for cooling and weight
reduction with water pump molded into the block.
Nominal wall thickness is 4 mm. The bedplate incor-
porates main bearing caps. The rear oil seal retainer
is integral with the block.
Fig. 1 Engine Identification 2.0L
1 ± ENGINE IDENTIFICATION LOCATION
PL2.0L SOHC ENGINE 9 - 15

CRANKSHAFT
A nodular cast iron crankshaft is used. The engine
has five main bearings. The number three main is
flanged to control thrust. The mains and connecting
rod journals have undercut fillet radiuses that are
deep rolled for added strength. To optimize bearing
loading, eight counterweights are used. Hydrody-
namic seals provide end sealing, where the crank-
shaft exits the block. Anaerobic gasket material is
used for parting line sealing. A sintered iron timing
belt sprocket is mounted on the crankshaft nose. This
sprocket transmits crankshaft movement, via timing
belt to the camshaft sprocket providing timed valve
actuation.
PISTONS
The engineDOES NOThave provision for a free
wheeling valve train. Non free wheeling valve train
means, in the event of a broken timing belt pistons
will contact the valves. The engine uses pressed-in
piston pins to attach forged powdered metal connect-
ing rods. The connecting rods are a cracked cap
design and are not repairable. Hex head cap screw
are used to provide alignment and durability in the
assembly. Pistons and connecting rods are serviced as
an assembly.
PISTON RINGS
The piston rings include a molybdenum faced top
ring for reliable compression sealing and a taper
faced intermediate ring for additional cylinder pres-
sure control. Oil Control Ring Package consist of two
steel rails and an expander spacer.
CYLINDER HEAD
The aluminum cylinder head features a Single
Over Head Camshaft (SOHC), four-valves per cylin-
der, cross flow design. The valves are arranged in
two inline banks, with the two intake per cylinder
facing toward the radiator. The exhaust valves facing
toward the dash panel. Rocker arm shafts mount
directly to the cylinder head. It incorporates powder
metal valve guides and seats. The hollow rocker arm
shafts supplies oil to the hydraulic lash adjusters,
camshaft and valve mechanisms.
CAMSHAFT
The nodular iron camshaft has five bearing jour-
nals and three cam lobes per cylinder. Provision for a
cam position sensor is provided on the camshaft at
the rear of cylinder head which also acts as thrust
plate. A hydrodynamic oil seal is used for oil control
at the front of the camshaft.
VALVES
Four valves per cylinder are actuated by roller
rocker arms/hydraulic lash adjusters assemblies
which pivot on rocker arm shafts. All valves have
chrome plated valve stems. Viton rubber valve stem
seals are integral with spring seats. Valve springs,
spring retainers, and locks are conventional design.
INTAKE MANIFOLD
The intake manifold is a molded plastic composi-
tion, attached to the cylinder head with five fasten-
ers. This long branch design enhances low and mid-
range torque.
EXHAUST MANIFOLD
The exhaust manifold is made of nodular cast iron
for strength and high temperatures. Exhaust gasses
exit the manifold into an articulated joint connection
and exhaust pipe.
COMPONENT REPLACEMENT
If any of the following parts have been changed or
replaced:
²Camshaft
²Camshaft Position Sensor
²Camshaft Position Sensor Target Magnet
²Cylinder Block
²Cylinder Head
²Water Pump
²Powertrain Control Module (PCM)
²Timing Belt and Timing Belt Tensioner
The camshaft and crankshaft timing relearn proce-
dure must be performed. Refer to the component
Removal and Installation procedure in this section.
9 - 16 2.0L SOHC ENGINEPL
DESCRIPTION AND OPERATION (Continued)

(4) Discharge air conditioning system, if equipped.
Refer to Group 24, Heating and Air Conditioning for
procedure.
(5) Disconnect the following: air intake duct at
intake manifold, throttle cables, electrical connectors
from throttle body and air cleaner housing.
(6) Remove air cleaner housing assembly.
(7) Remove upper radiator hose and fan module.
Refer to Group 7, Cooling System for procedure.
(8) Remove lower radiator hose.
(9) Disconnect automatic transmission cooler lines
and plug, if equipped.
(10) Disconnect shift linkage, electrical connectors,
and clutch cable, if equipped with manual transaxle.
(11) Disconnect engine wiring harness.
(12) Disconnect positive cable from Power Distri-
bution Center (PDC) and ground wire from vehicle
body.
(13) Disconnect ground wire from the vehicle body-
to-engine at the right side strut tower.
(14) Disconnect heater hoses.
(15) Disconnect vacuum hose from brake booster.
(16) Disconnect coolant reserve/recovery hose.
(17) Remove accessory drive belts. Refer to Group
7, Cooling System for procedure.
(18) Remove power steering pump and reservoir
and set them aside.
(19) Hoist vehicle and remove right inner splash
shield.
(20) Drain engine oil.
(21) Remove front wheels.
(22) Remove axle shafts. Refer to Group 3, Differ-
ential and Driveline for procedure.
(23) Disconnect exhaust system from manifold.
(24) Disconnect the downstream oxygen sensor
connector.
(25) Remove lower engine torque strut.
(26) Remove structural collar. Refer to procedure
in this section.
(27) Lower vehicle and remove A/C compressor.
(28) Raise vehicle enough to allow engine dolly
and cradle, Special Tools 6135 and 6710 to be
installed under vehicle.
(29) Loosen engine support posts to allow move-
ment for positioning onto engine locating holes and
flange on the engine bedplate. Lower vehicle and
position cradle until the engine is resting on support
posts (Fig. 26). Tighten mounts to cradle frame. This
will keep support posts from moving when removing
or installing engine and transmission.
(30) Install safety straps around the engine to cra-
dle (Fig. 26). Tighten straps and lock them into posi-
tion.
WARNING: Safety straps MUST be used.(31) Raise vehicle enough to see if straps are tight
enough to hold cradle assembly to engine.
(32) Lower vehicle so weight of the engine and
transmission ONLY is on the cradle assembly.
(33) Remove the upper engine torque strut.
(34) Remove right and left engine and transaxle
mount through bolts (Fig. 24) and (Fig. 25).
(35) Raise vehicle slowly until body is approxi-
mately 15 cm (6 in.) above normal engine mounting
locations.
(36) Remove generator, lower bracket, and upper
mounting bolt.
(37) Continue raising vehicle slowly until engine/
transaxle assembly clears engine compartment. It
may be necessary to move the engine/transmission
assembly with 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/transaxle assembly until vehicle is within 15
cm (6 in.) of engine mounting locations.
(2) Install generator, lower bracket, and adjusting
bolt.
(3) Continue lowering vehicle until engine/tran-
saxle aligns to mounting locations. Install mounting
bolts at the right and left engine/transaxle mounts
(Fig. 24) and (Fig. 25). Tighten bolts to 118 N´m (87
ft. lbs.).
(4) Install upper engine torque strut. Refer to pro-
cedure in this section.
(5) Remove safety straps from engine/transaxle
assembly. Slowly raise vehicle enough to remove the
engine dolly and cradle.
(6) Install axle shafts. Refer to Group 3, Differen-
tial and Driveline for procedure.
(7) Install structural collar. Refer to procedure in
this section tightening sequence.
Fig. 24 Right Mount Through Bolt
1 ± BOLT
2 ± RIGHT ENGINE MOUNT
3 ± ENGINE MOUNT BRACKET
9 - 26 2.0L SOHC ENGINEPL
REMOVAL AND INSTALLATION (Continued)

(8) Install lower engine torque strut. Refer to pro-
cedure in this section.
(9) Connect exhaust system to manifold. Refer to
Group 11, Exhaust System for procedure and torque
specifications.
(10) Connect the downstream oxygen sensor.
(11) Install A/C compressor and hoses. Refer to
Group 24, Heater and Air Conditioning for procedure.
(12) Install accessory drive belts. Refer to Group 7,
Cooling System Accessory Drive Section for belt ten-
sion adjustment.
(13) Install inner splash shield.
(14) Install wheels and lower vehicle.
(15) Install power steering pump and reservoir.
Refer to Group 7, Cooling System Accessory Drive
Section for belt tension adjustment.
(16)Manual Transmission:Connect clutch cable,
reverse light electrical connector and shift linkages.
Refer to Group 6, Clutch.
(17)Automatic Transmission:Connect shifter,
kickdown linkage and cooler lines. Refer to Group 21,
Transaxle for procedures.
(18) Connect fuel line and heater hoses.
(19)
Install all ground straps. Connect engine wiring
harness. Refer to Group 8, Electrical for procedure.
(20) Install lower radiator hose, fan module, and
upper radiator hose. Refer to Group 7, Cooling Sys-
tem for procedures
(21) Fill cooling system. Refer to Group 7, Cooling
System for filling procedure.
(22) Install battery tray and battery.
(23) Install air cleaner housing assembly and con-
nect intake duct to intake manifold.(24) Connect all throttle body electrical connectors
and linkage.
(25) Install oil filter. Fill engine crankcase with
proper oil to correct level.
(26) Perform camshaft and crankshaft timing
relearn procedure as follows:
²Connect the DRB scan tool to the data link
(diagnostic) connector. This connector is located in
the passenger compartment; at the lower edge of
instrument panel; near the steering column.
²Turn the ignition switch on and access the ªmis-
cellaneousº screen.
²Select ªre-learn cam/crankº option and follow
directions on DRB screen.
Fig. 25 Left Mount Through Bolt
1 ± MOUNT BRACKET
2 ± BOLT
3 ± MOUNT
Fig. 26 Positioning Engine Cradle Support Post
1 ± SAFETY STRAPS
2 ± PLACE REAR POSTS INTO LOCATING HOLES
3 ± SPECIAL TOOL 6848
4 ± SPECIAL TOOL 6710
5 ± SPECIAL TOOL 6135
6 ± SAFETY STRAPS
7 ± PLACE FRONT POST UNDER BLOCK FLANGE
PL2.0L SOHC ENGINE 9 - 27
REMOVAL AND INSTALLATION (Continued)

CAUTION: When using the ASD Fuel System Test,
the Auto Shutdown (ASD) relay will remain ener-
gized for 7 minutes or until the ignition switch is
turned to the OFF position, or Stop All Test is
selected.
EXHAUST MANIFOLD
REMOVAL
(1) Disconnect negative cable from battery.
(2) Raise vehicle on hoist.
(3) Remove bolt attaching the wire harness heat
shield to the exhaust manifold support bracket (Fed-
eral and LEV) (Fig. 34), or to the exhaust manifold
(ULEV).
(4) Remove exhaust manifold support bracket
(Federal and LEV) (Fig. 35).
(5) Remove fasteners attaching exhaust system
flex joint to exhaust manifold flange. Move exhaust
system rearward to clear flange studs.
(6) ULEV equippedÐremove the support bracket
from cylinder block to exhaust manifold (Fig. 36).
(7) Lower vehicle.
(8) Disconnect CCV hose from rear of cylinder
head cover.
(9) Disconnect oxygen sensor connector and har-
ness clip.
(10) Remove heat shield attaching bolts (Fig. 37).
(11) Remove upper heat shield for access to mani-
fold bolts.
(12) Remove exhaust manifold bolts.
(13) ULEV equippedÐremove cylinder head cover.
Refer to procedure in this section. Cover cylinder
head opening with a suitable covering.
(14) Remove exhaust manifold from top of vehicle,
between cylinder head and cowl.
INSTALLATION
(1) Position exhaust manifold and gasket in place.
(2) Install exhaust manifold bolts and tighten in
sequence shown in (Fig. 38) to 23 N´m (200 in. lbs.).
(3) ULEV equippedÐposition upper heat shield on
exhaust manifold. Install bolts and tighten to 23 N´m
(200 in. lbs.).
(4) Position lower and upper heat shield on
exhaust manifold. Install heat shield bolts and
tighten to 11 N´m (95 in. lbs.) (Fig. 37).
(5) Connect oxygen sensor electrical connector and
harness clip.
(6) ULEV equippedÐinstall cylinder head cover.
Refer to procedures in this section.
Fig. 33 Intake Manifold Gaskets
1 ± INTAKE MANIFOLD O-RING GASKETS
Fig. 34 Wire Harness Heat Shield BoltÐFederal &
LEV Shown, ULEV Similar
1 ± BOLT
2 ± BRACKET
3 ± HEAT SHIELD
Fig. 35 Exhaust Manifold Support BracketÐFederal
& LEV
1 ± BRACKET
2 ± BOLT (M10)
3 ± BOLT (M12)
4 ± NUT
9 - 30 2.0L SOHC ENGINEPL
REMOVAL AND INSTALLATION (Continued)

(7) Connect CCV hose on cylinder head cover port.
(8) Raise vehicle.
(9) Install new flex joint to manifold flange gasket.
(10) Attach exhaust system to manifold flange and
tighten fasteners to 28 N´m (250 in. lbs.).
(11) Install exhaust manifold support bracket (Fed-
eral and LEV) (Fig. 35). Tighten M10 bolt to 54 N´m
(40 ft. lbs.), M12 bolt to 95 N´m (70 ft. lbs.), and nut
to 28 N´m (250 in. lbs.).
(12) ULEV equippedÐinstall support bracket to
cylinder block and exhaust manifold (Fig. 36). Snug
all bolts first then tighten to 54 N´m (40 ft. lbs.).
(13) Install bolt attaching wire harness heat shield
to support bracket (Federal and LEV) (Fig. 34), or
exhaust manifold (ULEV).(14) Lower vehicle.
(15) Connect negative cable to battery.
CYLINDER HEAD COVER
REMOVAL
(1) Disconnect CCV (Fig. 39) and PCV (Fig. 40)
hoses from cylinder head cover.
(2) Remove ignition coil and spark plug cables
(Fig. 41).
(3) Remove cylinder head cover bolts.
(4) Remove cylinder head cover.
INSTALLATION
(1) Clean gasket surfaces. Inspect gasket and seals
(Fig. 42). Replace as necessary. For replacement of
spark plug tube seals, refer to Spark Plug Tube Seals
in this section for procedure.
CAUTION: Do not attempt to loosen or remove baf-
fle plate attaching screws. The screws are self-tap-
ping, and in the attempt to retighten, thread damage
(stripping) will result.
Fig. 36 Exhaust Manifold Support BracketÐULEV
1 ± MANIFOLD SUPPORT BRACKET
2 ± OIL FILTER
3 ± BOLTS
Fig. 37 Exhaust Manifold Heat Shields
1 ± BOLTS
2 ± HEAT SHIELDS
Fig. 38 Exhaust Manifold Tightening Sequence
Fig. 39 CCV Hose
PL2.0L SOHC ENGINE 9 - 31
REMOVAL AND INSTALLATION (Continued)

(5) Slide the rocker arms and spacers off the shaft.
Keep the spacers and rocker arms in the same loca-
tion for reassembly.
NOTE: Inspect the rocker arm for scoring, wear on
the roller or damage to the rocker arm (Fig. 49)
Replace if necessary. Check the location where the
rocker arms mount to the shafts for wear or dam-
age. Replace if damaged or worn. The rocker arm
shaft is hollow and is used as a lubrication oil duct.
Check oil holes for clogging with small wire, clean
as required. Lubricate the rocker arms and spacers.
Install onto shafts in their original position (Fig. 48).
INSTALLATION
CAUTION: Set crankshaft to 3 notches before TDC
before installing rocker arm shafts. Refer to Timing
Belt System and Camshaft Seal Service of this sec-
tion for procedure.
(1) Install rocker arm/hydraulic lash adjuster
assembly making sure that adjusters are at least
partially full of oil. This is indicated by little or no
plunger travel when the lash adjuster is depressed. If
there is excessive plunger travel. Place the rocker
arm assembly into clean engine oil and pump the
plunger until the lash adjuster travel is taken up. If
travel is not reduced, replace the assembly. Hydraulic
lash adjuster and rocker arm are serviced as an
assembly.(2) Install rocker arm and shaft assemblies with
NOTCH in the rocker arm shafts pointing up and
toward the timing belt side of the engine (Fig. 50).
Install the retainers in their original positions on the
exhaust and intake shafts (Fig. 48).
CAUTION: When installing the intake rocker arm
shaft assembly be sure that the plastic spacers do
not interfere with the spark plug tubes. If the spac-
ers do interfere rotate until they are at the proper
angle. To avoid damaging the spark plug tubes, do
not attempt rotating the spacers by forcing down
the shaft assembly.
(3) Tighten bolts to 28 N´m (250 in. lbs.) in
sequence shown in (Fig. 51).
(4) Install cylinder head cover. Refer to procedures
in this section.
Fig. 48 Rocker Arm Shaft Assemblies
1 ± EXHAUST ROCKER ARM ASSEMBLY
2 ± PLASTIC SHAFT SPACERS
3 ± INTAKE ROCKER ARM ASSEMBLY
4 ± ROCKER ARM SHAFT RETAINERS
Fig. 49 Rocker Arm Assemblies
1 ± EXHAUST ROCKER ARM
2 ± HYDRAULIC LASH ADJUSTERS
3 ± INTAKE ROCKER ARM
4 ± ROLLERS
Fig. 50 Rocker Arm Shaft Notches
1 ± NOTCHES FACING UP AND TOWARD THE TIMING BELT
SIDE OF THE ENGINE
PL2.0L SOHC ENGINE 9 - 35
REMOVAL AND INSTALLATION (Continued)

CYLINDER HEAD
REMOVAL
(1) Perform fuel system pressure release procedure
before attempting any repairs.Refer to Group 14,
Fuel System
(2) Disconnect negative battery cable.
(3) Remove power steering/air conditioning drive
belt. Refer to Group 7, Cooling System Accessory
Drive for procedure.
(4) Raise vehicle.
(5) Drain cooling system. Refer to Group 7, Cooling
System.
(6) Remove exhaust pipe from manifold.
(7) Remove right front wheel.
(8) Remove right side splash shield.
(9) Remove generator belt. Refer to Group 7, Cool-
ing System Accessory Drive Belts for procedure.
(10) Remove crankshaft damper. Refer to proce-
dure in this section.
(11) Remove lower torque strut.
(12) Lower vehicle and remove upper torque strut.
(13) Remove ground strap and power steering hose
support clip from engine mount bracket.
(14) Remove power steering pump assembly and
set aside.
(15) Support engine from beneath with a suitable
jack.
(16) Remove right side engine mount to bracket
through bolt.
(17) Remove the lower engine mount bracket bolt.
Raise engine slightly and remove the upper engine
mount bracket bolts.(18) Remove engine mount bracket. This procedure
may require additional raising/lowering of engine
until bracket will clear engine components.
(19) Remove front timing belt cover.
(20) Rotate engine until timing marks are aligned.
(21) Remove timing belt and tensioner. Refer to
procedures in this section.
(22) Remove camshaft sprocket. Refer to proce-
dures in this section.
(23) Remove rear timing belt cover.
(24) Disconnect fuel line at fuel rail.
(25) Remove coolant recovery container.
(26) Remove ground wire to cylinder head.
(27) Remove upper radiator hose.
(28) Remove intake manifold. Refer to procedure
in this section.
(29) Disconnect ignition coil electrical connector.
Remove coil pack and spark plug cables from engine.
(30) Remove Crankcase Closed Ventilation (CCV)
hose from cylinder head cover.
(31) Disconnect cam sensor and coolant tempera-
ture electrical connectors.
(32) Remove heater tube to cylinder head attach-
ing fasteners.
(33) Remove heater hose from thermostat housing
connector.
(34) Remove cylinder head cover.
(35) Remove cylinder head bolts.
(36) Remove cylinder head and gasket (Fig. 55).
PL2.0L SOHC ENGINE 9 - 37
REMOVAL AND INSTALLATION (Continued)

NOTE: Inspect camshaft bearing journals for scor-
ing. Cylinder head must be flat within 0.1 mm (0.004
inch) (Fig. 56).
INSTALLATION
EXAMINING CYLINDER HEAD BOLTS
NOTE: The cylinder head bolts should be examined
BEFORE reuse. If the threads are necked down, the
bolt(s) should be replaced (Fig. 57).
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(s) should be
replaced.CLEANING CYLINDER HEAD SEALING SURFACES
CAUTION: When cleaning cylinder head and cylin-
der block surfaces, DO NOT use a metal scraper.
Sealing surfaces could be cut or ground, resulting
in gasket leaks. Use only the cleaning methods
shown in (Fig. 58). If required, use a white (120 grit)
3M RolocYbristle disk on aluminum surfaces. A
yellow (80 grit) bristle disk can be used on cast iron
surfaces with care.
(1) Clean the cylinder head and cylinder block
sealing surfaces using a wood/plastic scraper. Apply
solvent or a commercially available gasket remover
to help soften the gasket residue. If additional clean-
ing is required, use a white (120 grit) 3M Rolocy
bristle disk and a drill motor to remove gasket resi-
due.
Fig. 55 Cylinder Head Assembly
1 ± ROCKER SHAFT RETAINING BOLT
2 ± VALVE RETAINING LOCKS
3 ± VALVE
4 ± VALVE SPRING
5 ± VALVE SEAL AND VALVE SPRING SEAT ASSEMBLY
6 ± SPARK PLUG TUBE SEAL
7 ± CAMSHAFT
8 ± ROCKER ARM SHAFT RETAINER SPACER
9 ± GASKET10 ± SPACER
11 ± INTAKE ROCKER ARM/HYDRAULIC LASH ADJUSTER
ASSEMBLY
12 ± EXHAUST ROCKER ARM/HYDRAULIC LASH ADJUSTER
ASSEMBLY
13 ± CAMSHAFT SEAL
14 ± RETAINER SPACER
15 ± VALVE SPRING RETAINER
9 - 38 2.0L SOHC ENGINEPL
REMOVAL AND INSTALLATION (Continued)