ad blue CHRYSLER VOYAGER 2001 Owner's Manual

INTELLIGENT POWER MODULE C2 - GREEN/BLUE 10 WAY
CAV CIRCUIT FUNCTION
1 N173 16DB/VT (BUILT-UP-EXPORT/
GAS)RADIATOR FAN RELAY CONTROL
1 N173 18DB/VT (EXCEPT BUILT-UP-
EXPORT/GAS)RADIATOR FAN RELAY CONTROL
2 V53 12BR/OR (BUILT-UP-EXPORT) HEADLAMP WASHER RELAY OUTPUT
3 L60 18WT/TN (EXCEPT BUILT-UP-EX-
PORT)RIGHT FRONT TURN SIGNAL DRIVER
3 L60 16WT/TN (BUILT-UP-EXPORT) RIGHT FRONT TURN SIGNAL DRIVER
4 L13 18WT/YL (BUILT-UP-EXPORT) HEADLAMP ADJUST SIGNAL
5 X2 18DG/OR HORN RELAY OUTPUT
6 L90 18WT/OR (FOG LAMPS) FRONT FOG LAMP RELAY OUTPUT
7 L61 18WT/LG (EXCEPT BUILT-UP-EX-
PORT)LEFT FRONT TURN SIGNAL DRIVER
7 L61 16WT/LG (BUILT-UP-EXPORT) LEFT FRONT TURN SIGNAL DRIVER
8- -
9 A112 12OR/RD FUSED B(+)
10 L89 18WT/YL (FOG LAMPS) FRONT FOG LAMP RELAY OUTPUT
INTELLIGENT POWER MODULE C3 (DIESEL) - YELLOW/RED 20 WAY
CAV CIRCUIT FUNCTION
1 N21 20DB/TN LIFT PUMP RELAY CONTROL
2- -
3 T751 20YL IGNITION SWITCH OUTPUT (START)
4 T2 18DG/WT TRS REVERSE SENSE
5 N2 18DB/YL LIFT PUMP RELAY OUTPUT
6 F202 18PK/GY IGNITION SWITCH OUTPUT (RUN-START)
7 C3 18DB/YL A/C COMPRESSOR CLUTCH RELAY OUTPUT
8 Z114 18BK/LG GROUND
9 C13 20LB/OR A/C COMPRESSOR CLUTCH RELAY CONTROL
10 A119 16RD/OR FUSED B(+)
11 C41 20LB/DG CABIN HEATER ASSIST CONTROL
12 T753 20DG/YL IGNITION SWITCH OUTPUT (START)
13 - -
14 T752 20DG/OR ENGINE STARTER MOTOR RELAY CONTROL
15 Z116 18BK/VT GROUND
16 K51 20BR/WT ECM/PCM RELAY CONTROL
17 F202 18PK/GY IGNITION SWITCH OUTPUT (RUN-START)
18 - -
19 K342 16BR/WT ECM/PCM RELAY OUTPUT
20 - -
8Wa - 80 - 68 8W-80 CONNECTOR PIN-OUTSRG

INTELLIGENT POWER MODULE C3 (GAS) - NATURAL/RED 20 WAY
CAV CIRCUIT FUNCTION
1 Z115 20BK/OR (EATX) (3.3L/3.8L) GROUND
1 Z115 18BK/OR (EATX) (2.4L) GROUND
2 F1 18PK/WT (EATX) FCM OUTPUT (UNLOCK-RUN-START)
3 T751 18YL (EATX) IGNITION SWITCH OUTPUT (START)
4 T2 18DG/WT TRS REVERSE SENSE
5 T16 18YL/OR (EATX) TRANSMISSION CONTROL RELAY OUTPUT
6 T15 18YL/BR (EATX) TRANSMISSION CONTROL RELAY CONTROL
7 C3 18DB/YL A/C COMPRESSOR CLUTCH RELAY OUTPUT
8 K31 18BR FUEL PUMP RELAY CONTROL
9 C13 18LB/OR A/C COMPRESSOR CLUTCH RELAY CONTROL
10 A104 18YL/RD (EATX) FUSED B(+)
11 - -
12 - -
13 D25 18WT/VT (EATX) PCI BUS (EATX)
14 T752 18DG/OR ENGINE STARTER MOTOR RELAY CONTROL
15 Z116 18BK/VT GROUND
16 K51 18BR/WT AUTOMATIC SHUTDOWN RELAY CONTROL
17 F202 18PK/GY IGNITION SWITCH OUTPUT (RUN-START)
18 K173 18BR/VT RADIATOR FAN RELAY CONTROL
19 F202 18PK/GY IGNITION SWITCH OUTPUT (RUN-START)
20 A109 18OR/RD FUSED B(+)
INTELLIGENT POWER MODULE C4 - BLUE 10 WAY
CAV CIRCUIT FUNCTION
1 Z127 12BK/DG (GAS) GROUND
2 T750 12YL/GY ENGINE STARTER MOTOR RELAY OUTPUT
3 K342 16BR/WT (DIESEL) ECM/PCM RELAY OUTPUT
3 K342 16BR/WT (GAS) AUTOMATIC SHUTDOWN RELAY OUTPUT
4 F500 16DG/PK (EXCEPT MTX)) FUSED IGNITION SWITCH OUTPUT (RUN)
5- -
6 D25 16WT/VT (ANTILOCK BRAKES) PCI BUS
7 A107 12TN/RD (ANTILOCK BRAKES) FUSED B(+)
8 A111 12DG/RD (ANTILOCK BRAKES) FUSED B(+)
9 A701 14BR/RD (GAS) B(+) (HAZARD FEED)
9 A710 14BR/RD (DIESEL) B(+) (HAZARD FEED)
10 - -
INTELLIGENT POWER MODULE C5 - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1 A1 4RD B(+)
2- -
3- -
4- -
RG8W-80 CONNECTOR PIN-OUTS8Wa-80-69

LICENSE LAMP (POWER RELEASE) - DK. GRAY 4 WAY
CAV CIRCUIT FUNCTION
1 L77 18WT/BR FUSED PARK LAMP RELAY OUTPUT (LEFT)
2 Z367 20BK/BR GROUND
3 P30 20TN/DG LIFTGATE HANDLE SWITCH SENSE
4 Z430 20BK/LG GROUND
LIFTGATE AJAR SWITCH (MANUAL RELEASE) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 Z78 20BK/OR GROUND
2 G78 20VT/OR LIFTGATE AJAR SWITCH SENSE
LIFTGATE AJAR SWITCH (POWER RELEASE) - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1 Z78 20BK/OR GROUND
2 G78 20VT/OR LIFTGATE AJAR SWITCH SENSE
3 P31 20TN/YL LIFTGATE RELEASE DRIVER
4 Z231 20BK/YL GROUND
LIFTGATE CINCH/RELEASE MOTOR (POWER LIFTGATE) - BLUE 7 WAY
CAV CIRCUIT FUNCTION
1 Z78 20BK/OR GROUND
2 G78 20VT/OR LIFTGATE AJAR SWITCH SENSE
3 Q60 20OR/YL LIFTGATE PAWL SWITCH SENSE
4 Z245 18BK/GY GROUND
5 Q85 18TN/WT LIFTGATE LATCH RELEASE DRIVER
6 Q84 18TN/GY LIFTGATE LATCH CINCH DRIVER
7 Q83 18OR/GY LIFTGATE LATCH CLUTCH DRIVER
LIFTGATE CYLINDER LOCK SWITCH - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 Z465 20BK/GY GROUND
2 G165 20VT/GY LIFTGATE CYLINDER LOCK SWITCH MUX
8Wa - 80 - 82 8W-80 CONNECTOR PIN-OUTSRG

OCCUPANT RESTRAINT CONTROLLER - YELLOW/RED 23 WAY
CAV CIRCUIT FUNCTION
1 R54 18LB/YL PASSENGER SEAT BELT TENSIONER LINE 2
2 R56 18LB/DG PASSENGER SEAT BELT TENSIONER LINE 1
3 R62 18LB/VT PASSENGER SQUIB 2 LINE 2
4 R64 18LB/WT PASSENGER SQUIB 2 LINE 1
5 R42 18LB/BR PASSENGER SQUIB 1 LINE 2
6 R44 18LB/OR PASSENGER SQUIB 1 LINE 1
7 R53 18LG/YL DRIVER SEAT BELT TENSIONER LINE 2
8 R55 18LG/DG DRIVER SEAT BELT TENSIONER LINE 1
9 R61 18LG/VT DRIVER SQUIB 2 LINE 1
10 R63 18LG/WT DRIVER SQUIB 2 LINE 2
11 R43 18LG/BR DRIVER SQUIB 1 LINE 1
12 R45 18LG/OR DRIVER SQUIB 1 LINE 2
13 - -
14 F201 18PK/OR FCM OUTPUT (RUN-START)
15 F100 18PK/VT FCM OUTPUT (RUN)
16 Z12 18BK/OR GROUND
17 R59 18LG/TN DRIVER SEAT BELT SWITCH LINE 1
18 R57 18LG/GY DRIVER SEAT BELT SWITCH LINE 2
19 R60 18LB/TN PASSENGER SEAT BELT SWITCH LINE 1
20 R58 18LB/GY PASSENGER SEAT BELT SWITCH LINE 2
21 D25 18WT/VT PCI BUS
22 - -
23 - -
OVERHEAD CONSOLE (EXCEPT BASE) - BLACK 12 WAY
CAV CIRCUIT FUNCTION
1 G23 20VT/DB SLIDING DOORS OVERHEAD SWITCH MUX
2 G25 20VT/TN LIFTGATE SWITCH MUX
3 D25 20WT/VT PCI BUS
4 Z113 20BK/DB GROUND
5 A114 20GY/RD FUSED B(+) (I.O.D.)
6 F503 20WT/PK IGNITION SWITCH OUTPUT (RUN)
7 Z13 20BK/WT GROUND
8 E15 20OR/DB ASH/RECEIVER LAMP FEED
9- -
10 - -
11 L24 20BK/GY (EXCEPT BUILT-UP-EX-
PORT) (PREMIUM/LUXURY)AUTOMATIC HEADLAMP SWITCH SENSOR
12 L1 20BK/WT (PREMIUM/LUXURY) BACK-UP LAMP FEED
RADIATOR FAN RELAY NO. 1 (DIESEL) - BLUE 9 WAY
CAV CIRCUIT FUNCTION
1- -
2 N201 12DB/LG RADIATOR FAN RELAY NO. 1 OUTPUT
3- -
4 K342 16BR/WT ECM/PCM RELAY OUTPUT
5- -
6 N210 18DB/DG LOW SPEED RADIATOR FAN RELAY CONTROL
7- -
8 A201 12RD/LG FUSED B(+)
9- -
RG8W-80 CONNECTOR PIN-OUTS8Wa-80-89

PASSENGER BLEND DOOR ACTUATOR (MTC) - GRAY 2 WAY
CAV CIRCUIT FUNCTION
1 C34 20DB/LB (LHD) COMMON DOOR DRIVER (B)
1 C33 20LB/BR (RHD) PASSENGER BLEND DOOR DRIVER (A)
2 C33 20LB/BR (LHD) PASSENGER BLEND DOOR DRIVER (A)
2 C34 20DB/LB (RHD) COMMON DOOR DRIVER (B)
PASSENGER DOOR COURTESY LAMP - GRAY 3 WAY
CAV CIRCUIT FUNCTION
1 Z322 20BK/BR (LHD) GROUND
1 Z321 20BK/BR (RHD) GROUND
2- -
3 M21 20YL/BR COURTESY LAMPS DRIVER
PASSENGER DOOR LOCK SWITCH - BLACK 3 WAY
CAV CIRCUIT FUNCTION
1 F304 16WT/PK (EXCEPT POWER WIN-
DOWS)FUSED ACCESSORY RELAY OUTPUT
1 F304 16WT/PK (POWER WINDOWS) FUSED WINDOW CIRCUIT BREAKER OUTPUT
2 G160 20VT/LG (LHD) RIGHT DOOR LOCK SWITCH MUX
2 G161 20VT/DG (RHD) LEFT DOOR LOCK SWITCH MUX
3 Z460 20BK/LG (LHD) GROUND
3 Z461 20BK/DG (RHD) GROUND
PASSENGER FOLDING MIRROR RELAY (BUILT-UP-EXPORT) - BLUE 9 WAY
CAV CIRCUIT FUNCTION
1- -
2- -
3- -
4 A108 18LG/RD FUSED B(+)
5 P164 18LG/DB PASSENGER FOLDING MIRROR RELAY INPUT
6 P162 18LG/DG PASSENGER FOLDING MIRROR RELAY CONTROL
7- -
8 P160 18TN/LG PASSENGER FOLDING MIRROR RELAY OUTPUT
9- -
RG8W-80 CONNECTOR PIN-OUTS8Wa-80-91

RADIATOR FAN RELAY (GAS) - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1 A112 12OR/RD FUSED B(+)
2 N23 12DB/DG RADIATOR FAN RELAY OUTPUT
3 Z723 18BK/DG GROUND
4 N173 16DB/VT (BUILT-UP-EXPORT) RADIATOR FAN RELAY CONTROL
4 N173 18DB/VT (EXCEPT BUILT-UP-
EXPORT)RADIATOR FAN RELAY CONTROL
RADIATOR FAN RELAY NO. 1 (DIESEL) - BLUE 9 WAY
CAV CIRCUIT FUNCTION
1- -
2 N201 12DB/LG RADIATOR FAN RELAY NO. 1 OUTPUT
3- -
4 K342 16BR/WT ECM/PCM RELAY OUTPUT
5- -
6 N210 18DB/DG LOW SPEED RADIATOR FAN RELAY CONTROL
7- -
8 A201 12RD/LG FUSED B(+)
9- -
RADIATOR FAN RELAY NO. 2 (DIESEL) - BLUE 9 WAY
CAV CIRCUIT FUNCTION
1- -
2 N112 12DB/OR RADIATOR FAN RELAY NO. 2 AND NO. 3 COMMON
OUTPUT
3- -
4 K342 16BR/WT ECM/PCM RELAY OUTPUT
5- -
6 N122 18DB/YL HIGH SPEED RADIATOR FAN DUAL RELAY CONTROL
7- -
8 A112 12OR/RD FUSED B(+)
9- -
RG8W-80 CONNECTOR PIN-OUTS8Wa - 80 - 101

RADIATOR FAN RELAY NO. 3 (DIESEL) - BLUE 9 WAY
CAV CIRCUIT FUNCTION
1- -
2 Z823 12BK GROUND
3- -
4 K342 16BR/WT ECM/PCM RELAY OUTPUT
5 N112 12DB/OR RADIATOR FAN RELAY NO. 2 AND NO. 3 COMMON
OUTPUT
6 N122 18DB/YL HIGH SPEED RADIATOR FAN DUAL RELAY CONTROL
7- -
8 N202 12DB/OR RADIATOR FAN NO. 1 CONTROL
9- -
RADIO C1 - GRAY 7 WAY
CAV CIRCUIT FUNCTION
1- -
2 X55 20DG/BR LEFT FRONT SPEAKER (-)
2 X155 20DG/LB (LOW LINE) LEFT FRONT I/P SPEAKER (-)
3 X156 20GY/LB (LOW LINE) RIGHT FRONT I/P SPEAKER (-)
3 X56 20GY/BR RIGHT FRONT SPEAKER (-)
4 E17 20OR/YL (EXCEPT BUILT-UP-EX-
PORT)PARADE MODE SIGNAL
5 E14 20OR/TN PANEL LAMPS DRIVER
6 F306 16DB/PK FUSED ACCESSORY RELAY OUTPUT
7 A114 16GY/RD FUSED B(+) (I.O.D.)
RADIO C2 - BLACK 7 WAY
CAV CIRCUIT FUNCTION
1 X60 20GY/YL (BUILT-UP-EXPORT) RADIO 12 VOLT OUTPUT
2 X51 20DG/DB LEFT REAR SPEAKER (+)
3 X52 20GY/DB RIGHT REAR SPEAKER (+)
4 X53 20DG LEFT FRONT SPEAKER (+)
4 X153 20DG/YL (LOW LINE) LEFT FRONT I/P SPEAKER (+)
5 X154 20GY/YL (LOW LINE) RIGHT FRONT I/P SPEAKER (+)
5 X54 20GY RIGHT FRONT SPEAKER (+)
6 X57 20DG/OR LEFT REAR SPEAKER (-)
7 X58 20GY/OR RIGHT REAR SPEAKER (-)
RADIO C3 - WHITE/RED 2 WAY
CAV CIRCUIT FUNCTION
1 D25 20WT/VT PCI BUS
2- -
8Wa - 80 - 102 8W-80 CONNECTOR PIN-OUTSRG

ENGINE 2.4L
DESCRIPTION
The 2.4 Liter (148 cu. in.) in-line four cylinder
engine is a double over head camshaft with hydraulic
lifters and four valve per cylinder design. The engine
is free-wheeling; meaning it has provisions for piston-
to-valve clearance. However valve-to-valve interfer-
ence 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 - CYLINDER
COMBUSTION PRESSURE LEAKAGE
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, 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 radiator 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.
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE
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 the ignition coil electrical connector.
(5) Be sure throttle blade is fully open during the
compression check.
(6) Insert compression gage adaptor Special Tool
8116 or the equivalent, into the #1 spark plug hole in
cylinder head. Connect the 0±500 psi (Blue) pressure
transducer with cable adaptors to the DRBIIIt.
(7) Crank engine until maximum pressure is
reached on gage. Record this pressure as #1 cylinder
pressure.
(8) Repeat the previous step for all remaining cyl-
inders.
(9) Compression should not be less than 689 kPa
(100 psi) and not vary more than 25 percent from cyl-
inder to cylinder.
(10) If one or more cylinders have abnormally low
compression pressures, repeat the compression test.
(11) 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
Fig. 1 Engine Identification
1 - ENGINE IDENTIFICATION LOCATION
RSENGINE 2.4L9-3

²Gradually apply air pressure from 1 psi to 2.5
psi maximum while applying soapy water at the sus-
pected source. Adjust the regulator to the suitable
test pressure that provides the best bubbles which
will pinpoint the leak source. If the oil leak is
detected and identified, repair per service manual
procedures.
²If the leakage occurs at the crankshaft rear oil
seal area, refer to the section, Inspection for Rear
Seal Area Leak.
(6) If no leaks are detected, turn off the air supply.
Remove the air hose, all plugs, and caps. Install the
PCV valve and fresh air hose (make-up air). Proceed
to next step.
(7) Clean the oil off the suspect oil leak area using
a suitable solvent. Drive the vehicle at various
speeds approximately 24 km (15 miles). Inspect the
engine for signs of an oil leak by using a black light.
NOTE: If oil leakage is observed at the dipstick tube
to block location; remove the tube, clean and reseal
using MoparTStud & Bearing Mount (press fit tube
applications only), and for O-ring style tubes,
remove tube and replace the O-ring seal.
INSPECTION FOR REAR SEAL AREA LEAKS
Since it is sometimes difficult to determine the
source of an oil leak in the rear seal area of the
engine, a more involved inspection is necessary. The
following steps should be followed to help pinpoint
the source of the leak.
If the leakage occurs at the crankshaft rear oil seal
area:
(1) Disconnect the battery.
(2) Raise the vehicle.
(3) Remove torque converter or clutch housing
cover and inspect rear of block for evidence of oil.
Use a black light to check for the oil leak. If a leak is
present in this area, remove transmission for further
inspection.
(a) Circular spray pattern generally indicates
seal leakage or crankshaft damage.
(b) Where leakage tends to run straight down,
possible causes are a porous block, oil gallery cup
plug, bedplate to cylinder block mating surfaces
and seal bore. See proper repair procedures for
these items.
(4) If no leaks are detected, pressurize the crank-
case as previously described.
CAUTION: Do not exceed 20.6 kPa (3 psi).
(5) If the leak is not detected, very slowly turn the
crankshaft and watch for leakage. If a leak is
detected between the crankshaft and seal while
slowly turning the crankshaft, it is possible thecrankshaft seal surface is damaged. The seal area on
the crankshaft could have minor nicks or scratches
that can be polished out with emery cloth.
CAUTION: Use extreme caution when crankshaft
polishing is necessary to remove minor nicks and
scratches. The crankshaft seal flange is especially
machined to complement the function of the rear oil
seal.
(6) For bubbles that remain steady with shaft
rotation, no further inspection can be done until dis-
assembled.
(7) After the oil leak root cause and appropriate
corrective action have been identified, replace compo-
nent(s) as necessary.
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE
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 the ignition coil electrical connector.
(5) Be sure throttle blade is fully open during the
compression check.
(6) Insert compression gage adaptor Special Tool
8116 or the equivalent, into the #1 spark plug hole in
cylinder head. Connect the 0±500 psi (Blue) pressure
transducer with cable adaptors to the DRBIIIt.
(7) Crank engine until maximum pressure is
reached on gage. Record this pressure as #1 cylinder
pressure.
(8) Repeat the previous step for all remaining cyl-
inders.
(9) Compression should not be less than 689 kPa
(100 psi) and not vary more than 25 percent from cyl-
inder to cylinder.
(10) If one or more cylinders have abnormally low
compression pressures, repeat the compression test.
(11) 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
9 - 78 ENGINE 3.3/3.8LRS
ENGINE 3.3/3.8L (Continued)

(2) Measure the concentricity of valve seat using
dial indicator (Fig. 29). Total runout should not
exceed 0.051 mm (0.002 in.) total indicator reading.
(3) Inspect the valve seat using Prussian blue to
determine where the valve contacts the seat. To do
this, coat valve seatLIGHTLYwith Prussian blue
then set valve in place. Rotate the valve with light
pressure. If the blue is transferred to the center of
valve face, contact is satisfactory. If the blue is trans-
ferred to top edge of valve face, lower valve seat with
a 15 degree stone. If the blue is transferred to the
bottom edge of valve face raise valve seat with a 65
degrees stone.
NOTE: Valve seats which are worn or burned can
be reworked, provided that correct angle and seat
width are maintained. Otherwise cylinder head must
be replaced.
(4) When seat is properly positioned the width of
intake and exhaust seats should be 1.50±2.00 mm
(0.059±0.078 in.) (Fig. 26).
(5) After grinding the valve seats or faces, install
the valve in cylinder head and check valve installed
height by measuring from valve tip to spring seat
(Fig. 30). Remove valve from cylinder head and grind
valve tip until within specifications. Check valve tip
for scoring. The tip chamfer should be reground (if
necessary) to prevent seal damage when the valve is
installed.
(6) Check the valve spring installed height after
refacing the valve and seat (Fig. 30).If valves
and/or seats are reground, measure the
installed height of springs (Fig. 30), make sure
measurements are taken from top of spring
seat to the bottom surface of spring retainer. If
height is greater than specifications, install a0.794 mm (0.0312 in.) spacer in head counter-
bore to bring spring height back within specifi-
cations.
REMOVAL
(1) With cylinder head removed, compress valve
springs using Valve Spring Compressor Tool
C-3422-B with adapter 6412.
(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 to insure
installation in original location.
CLEANING
(1) Clean all valves thoroughly and discard
burned, warped and cracked valves.
INSPECTION
VALVES
(1) Clean and inspect valves thoroughly. Replace
burned, warped and cracked valves.
(2) Measure valve stems for wear (Fig. 31). For
valve specifications, (Refer to 9 - ENGINE - SPECI-
FICATIONS).
NOTE: Valve stems are chrome plated and should
not be polished (Fig. 31).
Fig. 29 Measurement of Valve Seat Runout
1 - DIAL INDICATOR
Fig. 30 Checking Valve and Spring Installed Height
1 - SPRING RETAINER
2 - VALVE INSTALLED HEIGHT* - 48.1±49.7 mm (1.89±1.95 in.)
3 - CYINDER HEAD SURFACE
4 - SPRING INSTALLED HEIGHT* - 41.1±42.7 mm (1.61±1.68 in.)
*(MEASURED FROM TOP OF SPRING SEAT)
9 - 100 ENGINE 3.3/3.8LRS
INTAKE/EXHAUST VALVES & SEATS (Continued)