fuel pressure CHRYSLER CARAVAN 2005 Owner's Manual

POWERTRAIN CONTROL MODULE C3 - NATURAL 38 WAY
CAV CIRCUIT FUNCTION
1- -
2- -
3 K51 18BR/WT ASD RELAY CONTROL
4- -
5 V35 18VT/OR S/C VENT CONTROL
6 K173 18BR/VT RAD FAN RELAY CONTROL
7 V32 18VT/YL SPEED CONTROL SUPPLY
8 K106 20VT/LB (EXCEPT EXPORT) NVLD SOL CONTROL
9 K299 18BR/WT O2 1/2 HEATER CONTROL
10 - -
11 C13 18LB/OR A/C CLUTCH RELAY CONTROL
12 V36 18VT/YL S/C VACUUM CONTROL
13 - -
14 - -
15 - -
16 - -
17 - -
18 - -
19 K342 16BR/WT ASD RELAY OUTPUT
20 K52 18DB/WT EVAP PURGE CONTROL
21 T141 18YL (MTX EXPORT) FUSED IGNITION SWITCH OUTPUT (START)
22 - -
23 B29 18DG/WT BRAKE SWITCH SIGNAL
24 - -
25 - -
26 - -
27 - -
28 K342 16BR/WT ASD RELAY OUTPUT
29 K70 18DB/BR EVAP PURGE SIGNAL
30 - -
31 C18 18LB/BR A/C PRESSURE SIGNAL
32 K91 18DB/YL BATTERY TEMP SIGNAL
33 - -
34 V37 18VT S/C SWITCH NO. 1 SIGNAL
35 K107 20VT/WT (EXCEPT EXPORT) NVLD SWITCH SIGNAL
36 - -
37 K31 18BR FUEL PUMP RELAY CONTROL
38 T752 18DG/OR STARTER RELAY CONTROL
8W - 80 - 118 8W-80 CONNECTOR PIN-OUTSRS

CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Body Control Module C2 BK/GN Under Left Instrument Panel 41, 42
Body Control Module C3 BK/WT Under Left Instrument Panel 41, 42
Body Control Module C4 BK/GY Under Left Instrument Panel 20, 21, 30
Body Control Module C5 BK Under Left Instrument Panel 20, 21, 30
Boost Pressure Sensor (Diesel) BK Top Left of Engine 15
Brake Fuid Level Switch BK On Master Cylinder 6
Brake Lamp Switch BK At Top Of Brake Pedal 41, 42
Brake Transmission Shift
Interlock Solenoid (EATX)BK Near Steering Column 20, 21, 22, 31
C100 BK Left Fender Shield 5, 11
C101 LTGY Left Fender Shield 5
C102 (Gas) BK At Fuel Rail 11, 17
C103 (Diesel) BK Left Side Engine Compartment N/S
C104 (Except Export LTGY Near Controller Antilock Brake 18
C106 (Export) BK/YL Near Left Headlamp Leveling Motor N/S
C107 (Export) BK/YL Near Right Headlamp Leveling
MotorN/S
C111 (EATX) LTGY Left Front Engine 11
C112 (Gas) BK Near T/O for C101 N/S
C200 GY Left Side Instrument Panel 20, 21, 30, 41, 42
C202 GY Right Side Instrument Panel A/C
Heater Unit20, 24, 29
C204 (Premium NAT Rear of Radio 50
C206 BK Near Radio 20
C207 Near Radio N/S
C300 (LHD) BK Left Front Door Lower 36, 43
C300 (RHD) BK Right Front Door Lower N/S
C301 LTGY Left Front Door Upper 36, 43
C302 LTGY Right Front Door Upper 8, 39, 44
C303 BK Right Front Door Lower 8, 39, 44
C304 (LHD) YL Left Wire Track Seat to Body 32
C305 GY Left Wire Track Seat to Body 32 33
C306 (RHD) YL Right Wire Track Seat to Body 33
C307 YL Right Wire Track Seat to Body N/S
C308 (Except Side Airbags) GN Left Rear Sliding Door 40
C309 (Except Side Airbags) GN/GY Right Rear Sliding Door 32, 33, 39
C310 (Front Console) BK At Front Console 34
C311 (3 Zone HVAC) GY Rear A/C Switch 40
C312 GY Right B Pillar 33, 39, 50
C313 (Rear Console/Export) BK At Rear Console 34
C314 BK Left Side Liftgate 49
C315 (Power Liftgate) BK Right Side Liftgate 49
C316 (Power Sliding Door) BK Wire Track to Sliding Door N/S
8W - 91 - 2 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONRS
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Engine Coolant Temp Sensor
(Gas)BK On Cylinder Block N/S
Engine Oil Pressure Sensor
(Diesel)BK Rear of Engine 16
Engine Coolant Temp Sensor
(Diesel)BL On Cylinder Block 15
Engine Oil Pressure Switch (Gas) LTGN On Cylinder Block 12, 18
Engine Starter Motor At Starter Motor 13, 15, 18
EVAP/Purge Solenoid (Gas) BK Right Motor Mount 10, 17
Evaporator Temperature Sensor BK Right Side of HVAC N/S
Floor Console Lamp BK At Lamp N/S
Floor Console Power Outlet RD At Front Console N/S
Front Blower Module C1 (ATC) BK On HVAC N/S
Front Blower Module C2 (ATC) BK On HVAC N/S
Front Cigar Lighter RD/NAT Rear of Lighter 20, 23, 25
Front Control Module BK In Integrated Power Module N/S
Front Intrusion Sensor (United
Kingdom)BK At Sensor N/S
Front Reading Lamps/Switch BK At Switch N/S
Fuel Heater (Diesel) BK Left Rear Engine Compartment N/S
Fuel Injector No.1 (2.4L/3.3L/
3.8L)BK At Fuel Injector N/S
Fuel Injector No.1 (Diesel) BK At Fuel Injector 15
Fuel Injector No.2 (2.4L/3.3L/
3.8L)BK At Fuel Injector N/S
Fuel Injector No.2 (Diesel) BK At Fuel Injector 15
Fuel Injector No.3 (2.4L/3.3L/
3.8L)BK At Fuel Injector N/S
Fuel Injector No.3 (Diesel) BK At Fuel Injector 15
Fuel Injector No.4 (2.4L/3.3L/
3.8L)BK At Fuel Injector N/S
Fuel Injector No.4 (Diesel) BK At Fuel Injector 15
Fuel Injector No.5 (3.3L/3.8L) BK At Fuel Injector N/S
Fuel Injector No.6 (3.3L/3.8L) BK At Fuel Injector N/S
Fuel Pressure Sensor (Diesel) BK Top Left of Engine 15
Fuel Pressure Solenoid (Diesel) Right Front Engine 15
Fuel Pump Module LTGY Side of Fuel Tank 34
Generator BK Rear of Generator 11, 15, 17, 18
Glow Plug No.1 (Diesel) Top of Engine N/S
Glow Plug No.2 (Diesel) Top of Engine 15
Glow Plug No.3 (Diesel) Top of Engine 15
Glow Plug No.4 (Diesel) Top of Engine 15
Glow Plug Relay (Diesel) BK Near Transmission 15, 16
Hands Free Module C1 Instrument Panel N/S
RS8W-91 CONNECTOR/GROUND/SPLICE LOCATION8W-91-5
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Right Sliding Door Motor BK At Sliding Door 45
Right Speed Control Switch WT At Steering Wheel N/S
Right Turn Signal Lamp (Export) OR At Lamp N/S
Right Visor/Vanity Lamp BK At Lamp N/S
Sentry Key Remote Entry Module
(SKREEM)BK At Steering Column 20, 21, 22, 23, 31
Siren (United Kingdom) BK Left Front Body N/S
Speed Control Servo (Gas) BK Near Controller Antilock Brake 11, 17, 18
Sunroof Module (Except Export) BK At Sunroof N/S
Sunroof Switch (Except Export) NAT Near Overhead Console N/S
Thatcham Alarm Module (United
Kingdom)BK Top Right Side of Instrument Panel
Near SpeakerN/S
Throttle Position Sensor (Gas) GY On Throttle Body 10, 11, 17
Traction Control Switch BK Rear of Swtich 21, 22, 31
Trailer Tow Connector (Except
Export)Left Quarter Panel N/S
Transmission Control Relay
(Diesel)Near Transmission 16
Transmission Range Sensor DKGY Top of Transmission 14, 19
Transmission Solenoid/Pressure
Switch AssemblyBK Side of Transmission 14, 19
Vehicle Speed Sensor (MTX) BK Rear of Transmission 16
Washer Fluid Level Switch BK Bottom of Reservoir 3
Washer Pump Motor BK Right Fender Well 3
Water in Fuel Sensor (Diesel) BK Left Rear Engine Compartment N/S
Wiper Module DKGY Left Side Cowl 6
GROUNDS
GROUND NUMBER LOCATION FIG.
G100 Body Ground Near Powertrain Control Module N/S
G101 Above Starter 13, 15, 18
G102 Left Headlamp Area 1
G103 Above Starter 15
G200 Left Side of Instrument Panel 20, 21 29
G201 Right Side of Instrument Panel 20, 24, 29
G202 Near Radio N/S
G300 Left B Pillar 32
G301 Right B Pillar 33, 39
G302 Left Rear Quarter 47
G303 Liftgate Ground 49
8W - 91 - 12 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONRS
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

SPLICES
SPLICE NUMBER LOCATION FIG.
S101 (Gas) Near T/O for Radiator Fan No.1 1
S103 (Diesel) Between T/O for Battery Temperature Sensor and T/O
for C10215
S106 (2.5L) Near T/O for Battery Temperature Sensor 15
S106 (3.3L/3.8L) Near T/O for G103 18
S107 (Gas) Near T/O for Integrated Power Module C3 11
S107 (Diesel) In T/O for Integrated Power Module C3 7
S111 (2.4L) Near T/O for C101 11
S111 (Diesel) In T/O for Battery (-) N/S
S111 (3.3L/3.8L) Near T/O for Battery Temperature Sensor N/S
S112 (Gas) Near T/O for Integrated Power Module - C3 19, 5, 11
S113 (2.4L) Near T/O for Park/Neutral Position Switch 11
S114 (2.4L) Near T/O for Powertrain Control Module C4 11
S114 (3.3L/3.8L) In T/O to Transmission Control Module N/S
S115 (2.4L) Near T/O for Powertrain Control Module C4 11
S115 (3.3L/3.8L) In T/O to Transmission Control Module N/S
S116 (2.4L) 180mm from T/O for Torque Converter Clutch Solenoid 11, 13
S116 (Diesel) Near T/O for Mass Air Flow Sensor 16
S116 (3.3L/3.8L) Near T/O for G103 18
S118 (2.4L) Near T/O for Knock Sensor 11, 13
S119 (Diesel) Near T/O for Engine Starter Motor 15
S121 (3.3L/3.8L) Near T/O for Output Speed Sensor 18
S122 (2.4L) In T/O to Engine Starter Motor 13
S122 (3.3L/3.8L) In T/O to Engine Starter Motor 18
S124 (2.4L) Near T/O for Fuel Injector No.2 N/S
S124 (3.3L/3.8L) Near T/O for Fuel Injector No.5 and No.6 N/S
S125 (2.4L) In T/O for Manifold Absolute Pressure Sensor N/S
S126 In Right Headlamp Leveling Assembly N/S
S127 (Diesel) In T/O for Engine Starter Motor N/S
S128 (Diesel) Near T/O for Engine Starter Motor N/S
S129 (Diesel) Near T/O for Battery (+) N/S
S130 (Diesel) Near T/O for Battery (+) N/S
S131 (2.4L) Near T/O for Transmission Control Module 11
S131 (3.3L/3.8L) Near T/O for C110 N/S
S132 (Diesel) Near T/O for Battery (+) N/S
S134 (Diesel) IN T/O for Engine Control Module N/S
S135 (Diesel) Near T/O for Glow Plug No.2 N/S
S136 (Diesel) In T/O for Radiator Fan Relays 2
S137 (Diesel) Above Starter 15
S138 (Diesel) Between T/O for Radiator Fan No.2 and T/O for G102 N/S
RS8W-91 CONNECTOR/GROUND/SPLICE LOCATION8W-91-13
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

REMOVAL - CAMSHAFT SPROCKETS.....66
REMOVAL - CRANKSHAFT SPROCKET....66
CLEANING............................67
INSTALLATION
INSTALLATION - CRANKSHAFT SPROCKET . 67
INSTALLATION - CAMSHAFT SPROCKETS . . 67
INSTALLATION - TIMING BELT...........67
TIMING BELT TENSIONER & PULLEY
REMOVAL.............................69INSTALLATION.........................70
BALANCE SHAFTS AND CARRIER ASSEMBLY
DESCRIPTION.........................71
OPERATION...........................71
REMOVAL.............................71
INSTALLATION.........................73
ENGINE 2.4L
DESCRIPTION
The 2.4 Liter (148 cu. in.) in-line four cylinder
engine is a double over head camshaft with hydraulic
lash adjusters and four valve per cylinder design.
The engine is free-wheeling; meaning it has provi-
sions for piston-to-valve clearance. However valve-to-
valve interference can occur, if camshafts are rotated
independently.
The cylinders are numbered from front of the
engine to the rear. The firing order is 1±3±4±2.
The engine identification number is located on the
rear of the cylinder block (Fig. 1).
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
These malfunctions may be classified as either
mechanical (e.g., a strange noise), or performance
(e.g., engine idles rough and stalls).
Refer to the Engine Mechanical and the Engine
Performance diagnostic charts, for possible causes
and corrections of malfunctions (Refer to 9 - ENGINE
- DIAGNOSIS AND TESTING - MECHANICAL)
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING
- PERFORMANCE).
For fuel system diagnosis, (Refer to 14 - FUEL
SYSTEM/FUEL DELIVERY - DIAGNOSIS AND
TESTING).
Additional tests and diagnostic procedures may be
necessary for specific engine malfunctions that can-
not be isolated with the Service Diagnosis charts.
Information concerning additional tests and diagno-
sis is provided within the following:
²Cylinder Compression Pressure Test
²Cylinder Combustion Pressure Leakage Test
²Engine Cylinder Head Gasket Failure Diagnosis
²Intake Manifold Leakage Diagnosis
²Hydraulic Lash Adjuster Noise Diagnosis
²Engine Oil Leak Inspection
Fig. 1 Engine Identification
1 - ENGINE IDENTIFICATION LOCATION
RSENGINE 2.4L9-3

Calibrate the tester according to the manufactur-
er's instructions. The shop air source for testing
should maintain 483 kPa (70 psi) minimum, 1,379
kPa (200 psi) maximum, with 552 kPa (80 psi) rec-
ommended.
Perform the test procedures on each cylinder
according to the tester manufacturer's instructions.
While testing, listen for pressurized air escaping
through the throttle body, tailpipe and oil filler cap
opening. Check for bubbles in the coolant.
All gauge pressure indications should be equal,
with no more than 25% leakage per cylinder.
FOR EXAMPLE:At 552 kPa (80 psi) input pres-
sure, a minimum of 414 kPa (60 psi) should be main-
tained in the cylinder.
STANDARD PROCEDURE
STANDARD PROCEDURE - ENGINE CORE AND
OIL GALLERY PLUGS
Using a blunt tool such as a drift and a hammer,
strike the bottom edge of the cup plug. With the cup
plug rotated, grasp firmly with pliers or other suit-
able tool and remove plug (Fig. 2).
CAUTION: Do not drive cup plug into the casting as
restricted cooling can result and cause serious
engine problems.
Thoroughly clean inside of cup plug hole in cylin-
der block or head. Be sure to remove old sealer.
Lightly coat inside of cup plug hole with Mopart
Stud and Bearing Mount. Make certain the new plugis cleaned of all oil or grease. Using proper drive
plug, drive plug into hole so that the sharp edge of
the plug is at least 0.5 mm (0.020 in.) inside the
lead-in chamfer.
It is not necessary to wait for curing of the sealant.
The cooling system can be refilled and the vehicle
placed in service immediately.
STANDARD PROCEDURE - REPAIR OF
DAMAGED OR WORN THREADS
Damaged or worn threads (excluding spark plug
and camshaft bearing cap attaching threads) can be
repaired. Essentially, this repair consists of drilling
out worn or damaged threads, tapping the hole with
a special Heli-Coil Tap, (or equivalent) and installing
an insert into the tapped hole. This brings the hole
back to its original thread size.
CAUTION: Be sure that the tapped holes maintain
the original center line.
Heli-Coil tools and inserts are readily available
from automotive parts jobbers.
HYDROSTATIC LOCKED ENGINE
When an engine is suspected to be hydrostatically
locked, regardless of what caused the problem, the
following steps should be used.
CAUTION: DO NOT use starter motor to rotate the
engine, severe damage may occur.
(1) Inspect air cleaner, induction system and
intake manifold to insure system is dry and clear of
foreign material.
(2) Remove negative battery cable.
(3) Place a shop towel around the spark plugs
when removing them from the engine. This will catch
any fluid that may possibly be in the cylinder under
pressure.
(4) With all spark plugs removed, rotate engine
crankshaft using a breaker bar and socket.
(5) Identify the fluid in the cylinder(s) (i.e., cool-
ant, fuel, oil or other).
(6) Make sure all fluid has been removed from the
cylinders. Inspect engine for damage (i.e., connecting
rods, pistons, valves, etc.)
(7) Repair engine or components as necessary to
prevent this problem from re-occurring.
CAUTION: Squirt approximately one teaspoon of oil
into the cylinders, rotate engine to lubricate the cyl-
inder walls to prevent damage on restart.
(8) Install new spark plugs.
(9) Drain engine oil and remove oil filter.
(10) Install a new oil filter.
Fig. 2 Core Hole Plug Removal
1 - CYLINDER BLOCK
2 - REMOVE PLUG WITH PLIERS
3 - STRIKE HERE WITH HAMMER
4 - DRIFT PUNCH
5 - CUP PLUG
9 - 10 ENGINE 2.4LRS
ENGINE 2.4L (Continued)

²Drill motor with 3M RolocŸ Bristle Disc (white
or yellow) (Fig. 3)
CAUTION: Excessive pressure or high RPM (beyond
the recommended speed), can damage the sealing
surfaces. The mild (white, 120 grit) bristle disc is
recommended. If necessary, the medium (yellow, 80
grit) bristle disc may be used on cast iron surfaces
with care.
STANDARD PROCEDURE - MEASURING
BEARING CLEARANCE USING PLASTIGAGE
Engine crankshaft bearing clearances can be deter-
mined by use of Plastigage or equivalent. The follow-
ing is the recommended procedure for the use of
Plastigage:
(1) Remove oil film from surface to be checked.
Plastigage is soluble in oil.
(2) Place a piece of Plastigage across the entire
width of the bearing shell in the cap approximately
6.35 mm (1/4 in.) off center and away from the oil
holes (Fig. 4). (In addition, suspected areas can be
checked by placing the Plastigage in the suspected
area). Torque the bearing cap/bed plate bolts of the
bearing being checked to the proper specifications.
(3) Remove the bearing cap and compare the
width of the flattened Plastigage with the metric
scale provided on the package. Locate the band clos-
est to the same width. This band shows the amount
of clearance in thousandths of a millimeter. Differ-
ences in readings between the ends indicate the
amount of taper present. Record all readings taken.
Compare the clearance measurements to specsifica-
tions found in the engine specifications table(Refer to9 - ENGINE - SPECIFICATIONS).Plastigage gen-
erally is accompanied by two scales. One scale
is in inches, the other is a metric scale.
NOTE: Plastigage is available in a variety of clear-
ance ranges. Use the most appropriate range for
the specifications you are checking.
(4) Install the proper crankshaft bearings to
achieve the specified bearing clearances.
REMOVAL - ENGINE ASSEMBLY
(1) Perform fuel pressure release procedure (Refer
to 14 - FUEL SYSTEM/FUEL DELIVERY - STAN-
DARD PROCEDURE)
(2) Disconnect battery negative cable.
(3) Remove air cleaner housing and inlet tube.
(4) Disconnect the fuel line from fuel rail. (Refer to
14 - FUEL SYSTEM/FUEL DELIVERY/FUEL LINES
- STANDARD PROCEDURE)
(5) Disconnect all vacuum hoses.
(6) Drain cooling system. (Refer to 7 - COOLING -
STANDARD PROCEDURE)
(7) Remove radiator fans. (Refer to 7 - COOLING/
ENGINE/RADIATOR FAN - REMOVAL)
(8) Remove radiator upper and lower hoses.
NOTE: When the transaxle cooler lines are removed
from the rolled-groove type fittings at the transaxle,
damage to the inner wall of the hose will occur. To
prevent prevent potential leakage, the cooler hoses
must be cut off flush at the transaxle fitting, and a
service cooler hose splice kit must be installed
upon reassembly.
Fig. 3 Proper Tool Usage For Surface Preparation
1 - ABRASIVE PAD
2 - 3M ROLOCŸ BRISTLE DISC
3 - PLASTIC/WOOD SCRAPER
Fig. 4 Plastigage Placed in Lower ShellÐTypical
1 - PLASTIGAGE
9 - 12 ENGINE 2.4LRS
ENGINE 2.4L (Continued)

(24) Connect all vacuum lines.
(25) Connect the throttle cables.
(26) Connect the fuel line. (Refer to 14 - FUEL
SYSTEM/FUEL DELIVERY/QUICK CONNECT FIT-
TING - STANDARD PROCEDURE)
(27) Connect radiator lower and upper hoses.
(28) Install radiator fans. (Refer to 7 - COOLING/
ENGINE/RADIATOR FAN - INSTALLATION)
(29) Fill cooling system. (Refer to 7 - COOLING -
STANDARD PROCEDURE)
(30) Connect battery cables.
(31) Install air cleaner and inlet hose.
(32) Fill engine crankcase with proper oil to cor-
rect level.
(33) Start engine and run until operating temper-
ature is reached.
(34) Adjust transmission linkage, if necessary.
SPECIFICATIONS
SPECIFICATIONS - 2.4L ENGINE
GENERAL SPECIFICATIONS
DESCRIPTION SPECIFICATION
Type In-Line OHV, DOHC
Number of
Cylinders4
Firing Order 1-3-4-2
Compression
Ratio9.5:1
Max. Variation
Between
Cylinders25%
Metric Standard
Displacement 2.4 Liters 148 cu. in.
Bore 87.5 mm 3.445 in.
Stroke 101.0 mm 3.976 in.
Compression
Pressure1172-1551 kPa 170-225 psi
CYLINDER BLOCK
DESCRIPTION SPECIFICATIONS
Metric Standard
Cylinder Bore
Diameter87.4924 -
87.5076 mm3.4446 - 3.4452
in.
Out-of-Round
(Max.)0.051 mm 0.002 in.
Taper (Max.) 0.051 mm 0.002 in.
Fig. 9 RIGHT MOUNT TO RAIL AND ENGINE
1 - BOLT - MOUNT TO RAIL 68 N´m (50 ft. lbs.)
2 - BOLT - MOUNT TO ENGINE 54 N´m (40 ft. lbs.)
3 - BOLT - MOUNT TO RAIL (HORIZONTAL) 68 N´m (50 ft. lbs.)
4 - RIGHT ENGINE MOUNT
5 - RIGHT FRAME RAIL
Fig. 10 LEFT MOUNT TO FRAME BRACKET
1 - FRAME BRACKET
2 - FRAME RAIL - LEFT
3 - BOLT
4 - TRANSAXLE MOUNT
9 - 16 ENGINE 2.4LRS
ENGINE 2.4L (Continued)

CYLINDER-TO-CYLINDER LEAKAGE TEST
To determine if an engine cylinder head gasket is
leaking between adjacent cylinders, follow the proce-
dures in Cylinder Compression Pressure Test (Refer
to 9 - ENGINE - DIAGNOSIS AND TESTING). An
engine cylinder head gasket leaking between adja-
cent cylinders will result in approximately a 50±70%
reduction in compression pressure.
CYLINDER-TO-WATER JACKET LEAKAGE TEST
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING WITH COOLANT PRES-
SURE CAP REMOVED.
VISUAL TEST METHOD
With the engine cool, remove the coolant pressure
cap. Start the engine and allow it to warm up until
thermostat opens.
If a large combustion/compression pressure leak
exists, bubbles will be visible in the coolant.
COOLING SYSTEM TESTER METHOD
WARNING: WITH COOLING SYSTEM TESTER IN
PLACE, PRESSURE WILL BUILD UP FAST. EXCES-
SIVE PRESSURE BUILT UP, BY CONTINUOUS
ENGINE OPERATION, MUST BE RELEASED TO A
SAFE PRESSURE POINT. NEVER PERMIT PRES-
SURE TO EXCEED 138 kPa (20 psi).
Install Cooling System Tester 7700 or equivalent to
pressure cap neck. Start the engine and observe the
tester's pressure gauge. If gauge pulsates with every
power stroke of a cylinder a combustion pressure
leak is evident.
CHEMICAL TEST METHOD
Combustion leaks into the cooling system can also
be checked by using Bloc-Chek Kit C-3685-A or
equivalent. Perform test following the procedures
supplied with the tool kit.
REMOVAL - CYLINDER HEAD
(1) Perform fuel system pressure release procedure
before attempting any repairs.(Refer to 14 -
FUEL SYSTEM/FUEL DELIVERY - SPECIFICA-
TIONS)
(2) Disconnect battery negative cable.
(3) Drain cooling system. (Refer to 7 - COOLING -
STANDARD PROCEDURE)
(4) Remove air filter housing and inlet tube.
(5) Remove upper intake manifold. (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
REMOVAL)(6) Remove heater tube support bracket from cyl-
inder head.
(7) Disconnect radiator upper and heater supply
hoses from intake manifold water outlet connections.
(8) Remove accessory drive belts. (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL)
(9) Raise vehicle and remove exhaust pipe from
manifold.
(10) Remove power steering pump reservoir and
line support bracket from lower intake manifold and
set aside. Do not disconnect lines.
(11) Remove ignition coil and wires from engine.
(12) Disconnect cam sensor and fuel injector wir-
ing connectors.
(13) Remove timing belt and camshaft sprockets.
(Refer to 9 - ENGINE/VALVE TIMING/TIMING
BELT/CHAIN AND SPROCKETS - REMOVAL)
(14) Remove timing belt idler pulley and rear tim-
ing belt cover. (Refer to 9 - ENGINE/VALVE TIM-
ING/TIMING BELT / CHAIN COVER(S) -
REMOVAL)
(15) Remove cylinder head cover. (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - REMOVAL)
(16) Remove camshafts (Refer to 9 - ENGINE/
CYLINDER HEAD/CAMSHAFT(S) - REMOVAL).
NOTE: Identify rocker arm position to ensure cor-
rect re-installation in original position, if reused.
(17) Remove rocker arms. (Refer to 9 - ENGINE/
CYLINDER HEAD/ROCKER ARMS - REMOVAL)
(18) Remove cylinder head bolts in REVERSE
sequence of tightening (Fig. 19).
(19) Remove cylinder head from engine block.
(20) Inspect and clean cylinder head. (Refer to 9 -
ENGINE/CYLINDER HEAD - INSPECTION) (Refer
to 9 - ENGINE/CYLINDER HEAD - CLEANING)
CLEANING
To ensure engine gasket sealing, proper surface
preparation must be performed, especially with the
use of aluminum engine components and multi-layer
steel cylinder head gaskets.
NOTE: Multi-Layer Steel (MLS) head gaskets require
a scratch free sealing surface.
Remove all gasket material from cylinder head and
block (Refer to 9 - ENGINE - STANDARD PROCE-
DURE). Be careful not to gouge or scratch the alumi-
num head sealing surface.
Clean all engine oil passages.
9 - 26 ENGINE 2.4LRS
CYLINDER HEAD (Continued)