oil level CHRYSLER VOYAGER 1996 Owner's Guide

M20 20BR G75 18TN G10 18LG/RD
G76 18TN/YL V14 18RD/VT G78 18TN/BK G29 20BK/TN P96 20WT/LG G6 20GY V20 20BK/WT V13 18BR/LG G74 18TN/RD G77 18TN/OR
G4 18DB
P97 20WT/DG
P98 20WT/RD
G70 18BR/TN V7 20DG/WT
80 79 78
77
76 75 74 73 72 71
70
69 68 67
66
65
64
63 62 61 60 59 58 57 56 55 54 53
52 51 50 49 48 47
46
45
44
43
42 41 CAV COURTESY LAMP GROUND DRIVER DOOR AJAR SWITCH SENSE SEAT BELT SWITCH SENSE
RIGHT REAR DOOR AJAR SWITCH SENSE WIPER ON/OFF RELAY CONTROL LIFTGATE AJAR SWITCH SENSE WASHER FLUID SWITCH SENSE PASSENGER DOOR SWITCH MUX ENGINE OIL PRESSURE SWITCH SENSE REAR WASHER MOTOR CONTROL REAR WIPER MOTOR CONTROL PASSENGER DOOR AJAR SWITCH SENSE LEFT REAR DOOR AJAR SWITCH SENSE
FUEL LEVEL SENSOR SIGNAL
DRIVER DOOR SWITCH MUX
LIFTGATE LOCK/UNLOCK MUX
HOOD AJAR SWITCH SENSE WIPER PARK SWITCH SENSE
- -
-
-
-
- - -
-
- - - CIRCUIT
- -
-
-
-
- - -
-
- - - FUNCTION
G7 18WT/OR*
V38 20LB/RD*
G18 20PK/BK*
G58 20BK/YL* ENGINE COOLANT TEMPERATURE SENSOR SIGNAL
G55 20OR/BK* ENGINE DISABLE SIGNALPOWER MIRROR FOLD RELAY P171 20VT/WT
P174 20YL/RD POWER MIRROR UNFOLD RELAY
ENGINE SPEED SENSOR SIGNAL K159 20VT/RD*
BODY
CONTROL
MODULE - C1
NATURAL
80 70 60 50
71 61 51 41 L24 20WT/LG**
L193 20OR/WT**
* DIESEL
** GAS
BUILT-UP-EXPORT
VEHICLE SPEED SENSOR SIGNAL
AUTOMATIC HEADLAMP SIGNAL
SPEED CONTROL LAMP DRIVER
COOLANT LEVEL SWITCH SENSE
LOW BEAM RELAY CONTROL
NS/GS8W-80 CONNECTOR PIN-OUTS 8W - 80 - 15
NSGS8015J988W-3

Component/
GroundColor Location Fig.
Headlamp
Switch C1NAT Rear of Switch 11
Headlamp
Switch C2BK Rear of Switch 11
Headlamp
Washer MotorBottom of
ReserviorN/S
High Note Horn BK LT Frame Rail 4
Hood Ajar
SwitchNAT LT Fender 2
Horn Switch Rear of Driver
Airbag11
Idle Air Control
MotorBK On Throttle
Body5, 6, 7,
8, 9
Ignition Coil
Pack 2.4LBK Top of Valve
Cover6, 7
Ignition Coil
Pack 3.3L, 3.8LBK RT Side of
Engine9
Ignition Switch
C1GY Rear of Switch 11
Ignition Switch
C2GN Rear of Switch 11
Ignition Switch
C3BK Rear of Switch 11
Instrument
ClusterRD Rear of Cluster 11
Intake Air Temp
SensorGY On Intake 6, 7
J01D BK RT Side of
HVAC15
J02A BK Top of Liftgate 23
JO3A BK Top of Liftgate 23
Junction Block
C1GY On Junction
Block12, 13
Junction Block
C2GY On Junction
Block12, 13
Junction Block
C3GY On Junction
Block12
Junction Block
C4GY On Junction
Block12
Key-In Halo
LampWT Rear of Lamp 11
Knock Sensor
2.4LGY Front of
Cylinder Block6, 7
Knock Sensor
3.3L, 3.8LGY Front of
Cylinder BlockN/S
L15 BK Top of Liftgate 23Component/
GroundColor Location Fig.
L16 BK Top of Liftgate 23
Left
Combination
RelayBK LT Rear
Quarter PanelN/S
Left Door Ajar
SwitchBK LT B-PIllar 12
Left Door
Arm/Disarm
SwitchBK At Switch 19
Left Door
Courtesy LampBK At Lamp 19
Left Door
SpeakerBK At Speaker 19
Left Fog Lamp GY At Lamp 4
Left Front Door
Lock MotorBK At Motor 19
Left Front Panel
SpeakerBK At Speaker 11
Left Front
Park/Turn
Signal LampBK At Lamp 4
Left Front
Wheel Speed
SensorBK LT Fender Side
Shield2
Left Front
Window MotorRD At Motor 19
Left Headlamp BK At Lamp 2
Left Headlamp
Leveling MotorBK At Motor N/S
Left Liftgate
Flood LampBK At Lamp 23
Left Mid
Reading LampGY At Lamp 17
Left Power Door
Lock SwitchBK At Switch 19
Left Power
Mirror C1RD At Mirror 11
Left Power
Mirror C2BL At Mirror 11
Left Power
Window SwitchOR At Switch 19
Left Rear Lamp
AssemblyBK At Lamp 21
Left Rear Door
Ajar SwitchBK LT C-Pillar 21
Left Rear Pillar
SpeakerBK At Speaker 21
NS/GS8W - 90 CONNECTOR/GROUND LOCATIONS 8W - 90 - 33
DESCRIPTION AND OPERATION (Continued)

8W-95 SPLICE LOCATIONS
INDEX
page page
DESCRIPTION AND OPERATION
INTRODUCTION......................... 1SPLICE LOCATION INDEX.................. 1
SPLICE LOCATIONS (RHD)................ 15
DESCRIPTION AND OPERATION
INTRODUCTION
This section provides illustrations identifying the
general location of the splices in this vehicle. A spliceindex is provided. Use the wiring diagrams in each
section for splice number identification. Refer to the
index for the proper splice number.
SPLICE LOCATION INDEX
Splice Number Location Fig.
BS01 Near Split for Tail Lamps 12
BS02 Near Fuel Tank T/O 12
BS03 Near Instrument Panel T/O 9
BS05 Near Instrument Panel T/O 9
BS05 (2.5L) Near MSA Controller T/O N/S
BS06 Near Instrument Panel T/O 9
BS06 (2.5L) Near MSA Controller T/O N/S
BS08 Near Instrument Panel T/O 9
BS16 Near Right Park Lamp T/O 1
BS17 Near Split for Tail Lamps 12
BS19 Near Horn T/O 1
BS30 (2.5L) Near Generator T/O 5
BS31 Near Left Headlamp Leveling
Motor T/O1
BS31 (2.5L) In BCM T/O 5
BS32 (2.5L) In BCM T/O N/S
BS33 (2.5L) In BCM T/O N/S
BS34 (2.5L) In BCM T/O N/S
BS40 (2.5L) In Engine Harness T/O 5
BS41 (2.5L) In Engine Harness T/O N/S
CS01 Above Right Rear Door 11
CS02 Above Right Rear Door 11
CS03 Right B-Pillar 11
CS04 Right B-Pillar 11
DS01 Near LT Power WDO T/O 10
ES01 In TCM T/O 7
ES01 (2.5L) Near Battery Positive Terminal
T/ON/SSplice Number Location Fig.
ES02 (2.0L) Near Camshaft Position
Sensor T/O3
ES02 (2.4L) Near Fuel Rail T/O 4
ES02 (2.5L) Near Engine Speed Sensor
T/O5
ES02
(3.3L,3.8L)Near Transmission T/O 6
ES03 (2.0L) Near Distributor Coil T/O 2
ES03 (2.4L) Near PDC T/O 4
ES03
(3.3L,3.8L)Near Body Ground T/O 7
ES05 (2.4L) Near Knock Sensor T/O 4
ES05 (2.5L) In Fuel Injection Pump T/O 5
ES05
(3.3L,3.8L)Near Transmission T/O 6
ES06 (2.5L) Near Needle Movement
Sensor T/O5
ES06
(3.3L,3.8L)Near Transmission T/O N/S
ES07 (2.0L) Near Engine Ground T/O 2
ES07 (2.5L) Near Battery Negative
Terminal T/ON/S
ES07 (2.4L) Near Body Ground T/O 4, 7
ES07
(3.3L,3.8L)Near Battery Negative
Terminal T/O6
ES08
(3.3L,3.8L)Near Transmission T/O 6
ES09 (2.0L) In Battery Positive Terminal
T/O7
ES09 (2.4L) Near Battery Positive Terminal 4
NS/GS8W - 95 SPLICE LOCATIONS 8W - 95 - 1

SPLICE LOCATIONS (RHD)
Splice Number Location Fig.
BS01 Near Split for Tail Lamps 11
BS02 Near Fuel Tank T/O 11
BS03 Near I/P Bulkhead
Connector T/O8
BS05 Near Left Door T/O N/S
BS06 Near Left Door T/O N/S
BS08 Near Clutch Interlock switch
T/O8
BS16 Near RT Park Lamp T/O 1
BS17 Near Split for Tail Lamps 11
BS31 Near Left Headlamp
Leveling Motor T/O1
CS01 Above Right Rear Door 10
CS02 Above Right Rear Door 10
CS03 Right B-Pillar 10
CS04 Right B-Pillar 10
DS01 Near LT Power WDO T/O 9
ES01 In TCM T/O 6
ES02 (2.0L) Near Camshaft Position
Sensor T/O3
ES02 (2.4L) In Throttle Body T/O 4
ES02 (3.3L, 3.8L) Near Transmission T/O 5
ES03 (2.0L) Near Distributor Coil T/O 2
ES03 (2.4L) Near PDC T/O 4
ES03 (3.3L, 3.8L) Near Body Ground T/O 6
ES05 (2.4L) Near Knock Sensor T/O 4
ES05 (3.3L, 3.8L) Near Transmission T/O 5
ES06 Near Transmission T/O N/S
ES07 (2.0L) Near Engine Ground T/O 2
ES07 (2.4L) Near Body Ground T/O 4
ES07 (3.3L, 3.8L) Near Battery Negative
Terminal T/O6
ES08 (2.4L) Near Transmission T/O 4,6
ES09 (2.0L) Near Battery Positive
TerminalN/S
ES09 (2.4L) Near Battery Positive
Terminal4
ES09 (3.3L, 3.8L) Near Battery Positive
Terminal6
ES10 (2.4L) Near Knock Sensor T/O 6
ES10 (3.3L, 3.8L) Near Transmission T/O 5
ES11 (2.0L) Near Battery Positive
TerminalN/SSplice Number Location Fig.
ES11 (2.4L) Near Battery Negative
Terminal T/O4
ES11 (3.3L, 3.8L) Near Battery Negative
Terminal5,6
ES12 (2.0L) Near Engine Ground T/O 2
ES12 (2.4L) Near Throttle Body T/O 4
ES12 (3.3L, 3.8L) Near Battery Positive
Terminal T/O6
ES13 (2.4L) Near Generator T/O 4
ES13 (3.3L, 3.8L) Near Battery Negative
Terminal4
ES14 (2.4L) Near Generator Field T/O 4
ES14 (3.3L, 3.8L) Near Battery Negative
Terminal4
ES17 (2.0L) Near Camshaft Position
Sensor T/O3
ES17 (2.4L) Near Engine Ground T/O 4
ES17 (3.3L, 3,8L) Near Battery Negative
Terminal4
ES18 (2.0L) Near Camshaft Position
Sensor T/O3
ES18 (2.4L) Near Engine Ground T/O 4
ES18 (3.3L, 3.8L) Near Engine Ground T/O 6
ES21 (2.0L) Near Body Ground T/O N/S
ES21 (2.4L) Near Back Up Lamp Switch
T/O4
ES21 (3.3L, 3.8L) Near A/C Clutch T/O 5
ES23 (2.0L) Near Radiator Fan T/O N/S
ES23 (2.4L) Near Radiator Fan T/O 4
ES23 (3.3L, 3.8L) Near Body Ground T/O 6
ES24 Near Transmission T/O 4,6
ES24 (3.3L, 3.8L) Near Transmission T/O 5
ES99 (2.0L) Near Knock Sensor T/O 2
FS01 (2.4L) Near ECT Sensor T/O N/S
FS01 (3.3L, 3.8L) Near Injector #5 T/O N/S
FS02 (2.4L) Near Inj #2 T/O N/S
FS02 (3.3L, 3.8L) Between Inj's 4 and 6 N/S
FS03 (2.4L) Between Inj #2 and #3 N/S
PS01 Near Steering Column T/O 7
PS02 Near Steering Column T/O 7
RFS01 Near Radiator Fan #2 N/S
RFS02 Near Radiator Fan #1 N/S
NS/GS8W - 95 SPLICE LOCATIONS 8W - 95 - 15
DESCRIPTION AND OPERATION (Continued)

made to seal the area between the bedplate and cyl-
inder block without disturbing the bearing clearance
or alignment of these components.
GASKET DISASSEMBLY
Parts assembled with form-in-place gaskets may be
disassembled without unusual effort. In some
instances, it may be necessary to lightly tap the part
with a mallet or other suitable tool to break the seal
between the mating surfaces. A flat gasket scraper
may also be lightly tapped into the joint but care
must be taken not to damage the mating surfaces.
SURFACE PREPARATION
Scrape clean or wire brush all gasket surfaces to
remove all loose material. Inspect stamped parts to
ensure gasket rails are flat. Gasket surfaces must be
free of oil and dirt. Make sure old gasket material is
removed from blind attaching holes.
FORM-IN-PLACE GASKET APPLICATION
Assembling parts using a form-in-place gasket
requires care but it's easier then using precut gas-
kets.
MopartGasket Maker material should be applied
sparingly 1 mm (0.040 in.) diameter or less of sealant
to one gasket surface. Be certain the material sur-
rounds each mounting hole. Excess material can eas-
ily be wiped off. Components should be torqued in
place within 15 minutes. The use of a locating dowel
is recommended during assembly to prevent smear-
ing the material off location.
TheMopartSilicone Rubber Adhesive Sealant
gasket material or equivalent should be applied in a
continuous bead approximately 3 mm (0.120 in.) in
diameter. All mounting holes must be circled. For
corner sealing, a 3.17 or 6.35 mm (1/8 or 1/4 in.) drop
is placed in the center of the gasket contact area.
Uncured sealant may be removed with a shop towels.
Components should be torqued in place while the
sealant is still wet to the touch (within 10 minutes).
The usage of a locating dowel is recommended during
assembly to prevent smearing of material off loca-
tion.
CRANKSHAFT SPROCKET BOLT ACCESS PLUG
An Access plug is located in the right inner fender
shield. Remove the plug and insert the proper size
socket, extension and ratchet, when crankshaft rota-
tion is necessary.
ENGINE CORE PLUGS
REMOVAL
Using a blunt tool such as a drift or a screwdriver
and a hammer, strike the bottom edge of the cup
plug (Fig. 1). With the cup plug rotated, grasp firmlywith pliers or other suitable tool and remove plug
(Fig. 1).
CAUTION: Do not drive cup plug into the casting
as restricted cooling can result and cause serious
engine problems.
INSTALLATION
Thoroughly remove all rust and clean inside of cup
plug hole in cylinder block or head. Be sure to
remove old sealer. Lightly coat inside of cup plug hole
with sealer. Make certain the new plug is 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 inch.) inside the lead in chamfer
(Fig. 1).
It is in not necessary to wait for curing of the seal-
ant. The cooling system can be refilled and the vehi-
cle placed in service immediately.
ENGINE PERFORMANCE
If a loss of performance is noticed, timing belt or
chain may have skipped one or two teeth. Camshaft
and crankshaft timing should be checked. Refer to
Group 9, Engine Timing belt or chain installation.
It is important that the vehicle is operating to its
optimum performance level to maintain fuel economy
and lowest vehicle emissions. If vehicle is not operat-
ing to these standards, refer to Engine Diagnosis out-
lined is this section. The following procedures can
assist in achieving the proper engine diagnosis.
(1) Test cranking amperage draw. Refer to Group
8B, Starting.
(2) Check intake manifold for vacuum leaks.
(3) Perform cylinder compression pressure test.
Refer to Engine Diagnosis, outlined in this section.
(4) Clean or replace spark plugs as necessary and
adjust gap as specified in Group 8D, Ignition System.
Tighten to specifications.
Fig. 1 Core Hole Plug Removal
9 - 2 ENGINENS
GENERAL INFORMATION (Continued)

CAUTION: Be sure that the tapped holes maintain
the original centerline.
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, these
steps should be used.
CAUTION: Do Not Use Starter Motor To Rotate
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 occurring again.
CAUTION: Squirt approximately 1 teaspoon of oil
into cylinders, rotate engine to lubricate the cylin-
der walls to prevent damage on restart.
(8) Install new spark plugs.
(9) Drain engine oil and remove oil filter.
(10) Fill engine with specified amount of approved
oil and install new oil filter.
(11) Connect negative battery cable.
(12) Start engine and check for any leaks.
ENGINE OIL
Checking Oil Level
To assure proper engine lubrication, the engine oil
must be maintained at the correct level. Check the
oil level at regular intervals, such as every fuel stop.
The best time to check the oil level is about 5 min-
utes after a fully warmed-up engine is shut off, or
before starting the vehicle after it has sat overnight.
Checking the oil while the vehicle is on level
ground, will improve the accuracy of the oil level
readings. For 2.4L, 3.3L and 3.8L engines, maintain
the oil level between the MIN and MAX markings on
the dipstick. Adding one quart of oil when the read-ing is at the MIN mark will result in a MAX reading
on these engines. For the 3.0L engine, add one full
quart when the level on the dipstick is at or below
the ADD mark.
ENGINE OIL SERVICE
WARNING: NEW OR USED ENGINE OIL CAN BE
IRRITATING TO THE SKIN. AVOID PROLONGED OR
REPEATED SKIN CONTACT WITH ENGINE OIL.
CONTAMINANTS IN USED ENGINE OIL, CAUSED BY
INTERNAL COMBUSTION, CAN BE HAZARDOUS TO
YOUR HEALTH. THOROUGHLY WASH EXPOSED
SKIN WITH SOAP AND WATER. DO NOT WASH
SKIN WITH GASOLINE, DIESEL FUEL, THINNER, OR
SOLVENTS, HEALTH PROBLEMS CAN RESULT. DO
NOT POLLUTE, DISPOSE OF USED ENGINE OIL
PROPERLY. CONTACT YOUR DEALER OR GOVERN-
MENT AGENCY FOR LOCATION OF COLLECTION
CENTER IN YOUR AREA.
ENGINE OIL SPECIFICATION
CAUTION: Do not use non-detergent or straight
mineral oil when adding or changing crankcase
lubricant. Engine failure can result.
NSENGINE 9 - 5
GENERAL INFORMATION (Continued)

API SERVICE GRADE CERTIFIED
Use an engine oil that is API Service Grade Certi-
fied. MOPARtprovides engine oils that conforms to
this service grade.
SAE VISCOSITY
An SAE viscosity grade is used to specify the vis-
cosity of engine oil. Use only, engine oils with multi-
ple viscosities such as 5W-30 or 10W-30. These are
specified with a dual SAE viscosity grade which indi-
cates the cold-to-hot temperature viscosity range.
Select an engine oil that is best suited to your par-
ticular temperature range and variation (Fig. 5).
ENERGY CONSERVING OIL
An Energy Conserving type oil is recommended for
gasoline engines. They are designated as either
ENERGY CONSERVING or ENERGY CONSERV-
ING II.
CONTAINER IDENTIFICATION
Standard engine oil identification notations have
been adopted to aid in the proper selection of engine
oil. The identifying notations are located on the label
of engine oil plastic bottles and the top of engine oil
cans (Fig. 6).
ENGINE OIL CHANGE
Change engine oil at mileage and time intervals
described in the Maintenance Schedule.
TO CHANGE ENGINE OIL
Run engine until achieving normal operating tem-
perature.
(1) Position the vehicle on a level surface and turn
engine off.
(2) Hoist and support vehicle on safety stands.
Refer to Hoisting and Jacking Recommendations.
(3) Remove oil fill cap.
(4) Place a suitable drain pan under crankcase
drain.
(5) Remove drain plug from crankcase and allow
oil to drain into pan. Inspect drain plug threads for
stretching or other damage. Replace drain plug and
gasket if damaged.
(6) Install drain plug in crankcase.
(7) Lower vehicle and fill crankcase with specified
type and amount of engine oil described in this sec-
tion.
(8) Install oil fill cap.
(9) Start engine and inspect for leaks.
(10) Stop engine and inspect oil level.
Fig. 5 Temperature/Engine Oil Viscosity
Fig. 6 Engine Oil Container Standard Notations
9 - 6 ENGINENS
GENERAL INFORMATION (Continued)

ENGINE DIAGNOSIS
INDEX
page page
DIAGNOSIS AND TESTING
CYLINDER COMBUSTION
PRESSURE LEAKAGE TEST.............. 8
CYLINDER COMPRESSION PRESSURE TEST . . 7
ENGINE DIAGNOSISÐMECHANICAL......... 12
ENGINE DIAGNOSISÐPERFORMANCE...... 10GENERAL INFORMATION.................. 7
INSPECTION
(ENGINE OIL LEAKS IN GENERAL)......... 8
INTAKE MANIFOLD LEAKAGE DIAGNOSIS..... 7
LASH ADJUSTER (TAPPET)
NOISE DIAGNOSIS...................... 8
DIAGNOSIS AND TESTING
GENERAL INFORMATION
Engine diagnosis is helpful in determining the
causes of malfunctions.
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 Service DiagnosisÐMechanical Chart
and the Service DiagnosisÐPerformance Chart, for
possible causes and corrections of malfunctions. Refer
to Group 14, Fuel System, for the fuel system diag-
nosis.
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
INTAKE MANIFOLD LEAKAGE DIAGNOSIS
An intake manifold air leak is characterized by
lower than normal manifold vacuum. Also, one or
more cylinders may not be functioning.
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR
HANDS NEAR THE PULLEYS, BELTS OR THE FAN.
DO NOT WEAR LOOSE CLOTHING.
(1) Start the engine.
(2) Spray a small stream of water (Spray Bottle) at
the suspected leak area.
(3) If a change in RPM'S, the area of the suspected
leak has been found.
(4) Repair as required.
CYLINDER COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test
can be utilized to diagnose several engine malfunc-
tions.
Ensure the battery is completely charged and the
engine starter motor is in good operating condition.
Otherwise the indicated compression pressures may
not be valid for diagnosis purposes.
(1) Check engine oil level and add oil if necessary.
(2) Drive the vehicle until engine reaches normal
operating temperature. Select a route free from traf-
fic and other forms of congestion, observe all traffic
laws, and accelerate through the gears several times
briskly.
(3) Remove all spark plugs from engine. As spark
plugs are being removed, check electrodes for abnor-
mal firing indicators fouled, hot, oily, etc. Record cyl-
inder number of spark plug for future reference.
(4) Disconnect coil wire from distributor and
secure to good ground to prevent a spark from start-
ing a fire (Conventional Ignition System). For Direct
Ignition System DIS disconnect the coil connector.
(5) Be sure throttle blade is fully open during the
compression check.
(6) Insert compression gage adaptor into the #1
spark plug hole in cylinder head. Crank engine until
maximum pressure is reached on gage. Record this
pressure as #1 cylinder pressure.
(7) Repeat the previous step for all remaining cyl-
inders.
(8) Compression should not be less than (689kPa)
100 psi and not vary more than 25 percent from cyl-
inder to cylinder.
(9) If one or more cylinders have abnormally low
compression pressures, repeat the compression test.
(10) If the same cylinder or cylinders repeat an
abnormally low reading on the second compression
test, it could indicate the existence of a problem in
the cylinder in question.The recommended com-
pression pressures are to be used only as a
guide to diagnosing engine problems. An engine
should not be disassembled to determine the
NSENGINE 9 - 7

cause of low compression unless some malfunc-
tion is present.
(11) Clean or replace spark plugs as necessary
and adjust gap as specified in Group 8, Electrical.
Tighten to specifications.
(12) Test resistance of spark plug cables. Refer to
Group 8, Electrical Ignition System Secondary Cir-
cuit Inspection.
(13) Test coil output voltage, primary and second-
ary resistance. Replace parts as necessary. Refer to
Group 8, Electrical Ignition System.
(14) Check fuel pump pressure at idle and differ-
ent RPM ranges. Refer to Group 14, Fuel System for
Specifications.
(15) The air filter elements should be replaced as
specified in Group 0, Lubrication and Maintenance,.
(16) Inspect crankcase ventilation system as out
lined in Group 0, Lubrication and Maintenance. For
emission controls see Group 25, Emission Controls
for service procedures.
(17) Inspect and adjust accessory belt drives refer-
ring to Group 7, Cooling System, Accessory Drive
Belts for proper adjustments.
(18) Road test vehicle as a final test.
CYLINDER COMBUSTION PRESSURE LEAKAGE
TEST
The combustion pressure leakage test provides an
accurate means for determining engine condition.
Combustion pressure leakage testing will detect:
²Exhaust and intake valve leaks (improper seat-
ing).
²Leaks between adjacent cylinders or into water
jacket.
²Any causes for combustion/compression pressure
loss.
WARNING: DO NOT REMOVE THE RADIATOR CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.
Check the coolant level and fill as required. DO
NOT install the radiator cap.
Start and operate the engine until it attains nor-
mal operating temperature, then turn the engine
OFF.
Clean spark plug recesses with compressed air.
Remove the spark plugs.
Remove the oil filler cap.
Remove the air cleaner.
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 and 552 kPa (80 psi) recom-
mended.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 radiator coolant.
All gauge pressure indications should be equal,
with no more than 25% leakage.
FOR EXAMPLE:At 552 kPa (80 psi) input pres-
sure, a minimum of 414 kPa (60 psi) should be main-
tained in the cylinder.
LASH ADJUSTER (TAPPET) 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 pressed into 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.
a. 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.
b. Remove suspected lash adjusters, and disassem-
bleDo not reuse retainer caps. Do not inter-
change parts and make sure that care and
cleanliness is exercised in the handling of parts.
c. Clean out dirt and varnish with solvent.
d. Reassemble with engine oil.
e. Check for sponginess.
f. If still spongy, replace with new adjuster.
INSPECTION (ENGINE OIL LEAKS IN GENERAL)
Begin with a through visual inspection of the
engine, particularly at the area of the suspected leak.
If an oil leak source is not readily identifiable, the
following steps should be followed:
(1) Do not clean or degrease the engine at this
time because some solvents may cause rubber to
swell, temporarily stopping the leak.
9 - 8 ENGINENS
DIAGNOSIS AND TESTING (Continued)

ENGINE DIAGNOSISÐMECHANICAL
CONDITION POSSIBLE CAUSES CORRECTION
NOISY VALVES 1. High or low oil level in
crankcase.1. Check for correct oil level.
2. Thin or diluted oil. 2. Change oil to correct viscosity.
3. Low oil pressure. 3. Check engine oil level.
4. Dirt in tappets/lash adjusters. 4. Replace rocker arm/hydraulic
lash adjuster assembly.
5. Worn rocker arms. 5. Inspect oil supply to rocker arms.
6. Worn tappets/lash adjusters. 6. Install new rocker arm/hydraulic
lash adjuster assembly.
7. Worn valve guides. 7. Ream and install new valves with
oversize stems.
8. Excessive runout of valve seats
on valve faces.8. Grind valve seats and valves.
9. Missing adjuster pivot. 9. Replace rocker arm/hydraulic
lash adjuster assembly.
CONNECTING ROD NOISE 1. Insuffient oil supply. 1. Check engine oil level.
2. Low oil pressure. 2. Check engine oil level. Inspect oil
pump relief valve and spring.
3. Thin or diluted oil. 3. Change oil to correct viscosity.
4. Excessive bearing clearance. 4. Measure bearings for correct
clearance. Repair as necessary.
5. Connecting rod journal
out-of-round.5. Replace crankshaft or grind
surface.
6. Misaligned connecting rods. 6. Replace bent connecting rods.
MAIN BEARING NOISE 1. Insufficient oil supply. 1. Check engine oil level.
2. Low oil pressure. 2. Check engine oil level. Inspect oil
pump relief valve and spring.
3. Thin or diluted oil. 3. Change oil to correct viscosity.
4. Excessive bearing clearance. 4. Measure bearings for correct
clearance. Repair as necessary.
5. Excessive end play. 5. Check thrust bearing for wear on
flanges.
6. Crankshaft journal out-of-round
or worn.6. Replace crankshaft or grind
journals.
7. Loose flywheel or torque
converter.7. Tighten to correct torque.
OIL PRESSURE DROP 1. Low oil level. 1. Check engine oil level.
2. Faulty oil pressure sending unit. 2. Install new sending unit.
3. Low oil pressure. 3. Check sending unit and main
bearing oil clearance.
4. Clogged oil filter. 4. Install new oil filter.
5. Worn parts in oil pump. 5. Replace worn parts or pump.
6. Thin or diluted oil. 6. Change oil to correct viscosity.
7. Excessive bearing clearance. 7. Measure bearings for correct
clearance.
8. Oil pump relief valve stuck. 8. Remove valve and inspect, clean,
or replace.
9. Oil pump suction tube loose. 9. Remove oil pan and install new
tube or clean, if necessary.
10. Oil pump cover warped or
cracked.10. Install new oil pump.
9 - 12 ENGINENS
DIAGNOSIS AND TESTING (Continued)