sensor DODGE TRUCK 1993 Service Repair Manual

21 - 150
AUTOMATIC TRANSMISSION REMOVAL
AND
INSTALLATION

• (3) Remove transmission oil pan, remove gasket,
drain oil and reinstall pan. (4) If overdrive unit had malfunctioned, or if fluid
is contaminated, remove entire transmission. If diag­
nosis indicated overdrive clutch or governor problems
only, remove overdrive unit only.
(5) Mark propeller shaft universal joint and axle
pinion yoke for alignment reference at installation (Fig. 14). On 4WD models, mark both shafts for
ref­

erence.

Fig.
14 Marking Propeller Shaft And Axle Yoke For
Alignment
Reference
(6) Disconnect and remove propeller shaft. On
4WD models, remove both shafts.
(7) On 4WD models, disconnect transfer case shift
linkage and distance sensor and remove transfer

case.

(8) Support transmission with transmission jack.
(9) Remove rear crossmember.
(10) Remove vehicle speed sensor and speedometer
adapter.
(11) Remove bolts attaching overdrive unit to
transmission (Fig. 15).

CAUTION:
Support
the
overdrive unit with
a
jack before moving
it
rearward. This
is
necessary
to
pre­
vent damaging
the
intermediate shaft.
Do not
allow
the shaft
to
support
the
entire
weight
of the
over­ drive unit.

(12) Work overdrive unit rearward and off trans­
mission intermediate shaft.
(a) If overdrive unit does not require service, in­
sert Tool 6227-2 in overdrive unit overrunning
clutch and planetary gear to maintain spline align­
ment. If clutch and gear splines rotate out of
alignment, overdrive unit will have to be disas­
sembled in order to realign splines.
(b) If overdrive unit does requires service, refer
to Overdrive unit Overhaul section.
Fig.
15 Removing/Installing Overdrive Attaching

Bolts
(13) Remove and retain overdrive piston thrust
bearing. Bearing may remain on piston or in clutch hub during removal.
(14) Position drain pan on workbench.
(15) Place overdrive unit over drain pan. Tilt unit
to drain residual fluid from case. (16) Examine fluid for clutch material or metal
fragments. If fluid contains these items, overhaul
will be necessary.

OVERDRIVE
UNIT INSTALLATION
(1) Be sure Alignment Tool 6227-2 is fully seated
in overdrive planetary and overrunning clutch
splines before moving unit.
(2) If overdrive piston retainer was not removed
during service and original case gasket is in good
condition, proceed to step (6). However, if original case gasket is not reusable, trim and install replace­
ment gasket as described in steps (3) through (5).
(3) Cut out old case gasket around piston retainer
with razor knife (Fig. 16). (4) Use old gasket as template and trim new gas­
ket to fit. (5) Position new gasket over piston retainer and on
transmission case. Use petroleum jelly to hold gasket in place if necessary. Do not use any type of sealer
to secure gasket. Use petroleum jelly only. (6) Install selective spacer on intermediate shaft if
removed. Spacer goes in groove just rearward of shaft
rear splines (Fig. 17). (7) Install overdrive piston in retainer if removed.
Lubricate piston seals with Ru-Glyde, Door-Eze or
petroleum jelly to ease installation. Be sure piston lo­
cating lugs are aligned in piston retainer. (8) Install thrust bearing in overdrive unit sliding

hub.
Use petroleum jelly to hold bearing in position.

CAUTION:
Be
sure
the
shoulder
on the
inside diam­

eter
of the
bearing
is
facing forward.

•

AUTOMATIC
TRANSMISSION
REMOVAL
AND
INSTALLATION
21 - 151

Fig.
17
Intermediate
Shaft Selective
Spacer
Location (9) Raise overdrive unit on transmission jack and
align it with intermediate shaft. (10) Carefully remove Alignment Tool 6227-2 from
overdrive compounder.
(11) Slide overdrive unit straight onto intermedi­
ate shaft. Be sure park rod goes into park lock reac­
tion plug at same time.

CAUTION:
Do not tilt or
jounce
the
overdrive unit
during installation. This could cause
the
overdrive planetary
and
overrunning clutch splines
to
rotate

out
of
alignment.
If the
splines
rotate
out of
align­ ment,
it
will
be
necessary
to
disassemble
the
over­
drive unit
to
realign
the
splines
with
Tool
6227-2.

(12) Align slip-fit governor tubes in piston retainer
and work compounder unit forward on intermediate
shaft and seat unit against transmission case.
(13) Install bolts attaching overdrive unit to trans­
mission. Tighten bolts in diagonal pattern to 34 N»m (25 ft-lbs).
(14) Install crossmember.
(15) On 4WD models, install transfer case and con­
nect shift linkage and distance sensor. (16) Install speedometer adapter and vehicle speed
sensor. Be sure to index adapter.
(17) Connect vehicle speed sensor and overdrive so­
lenoid wires.
(18) Align and install propeller shaft, or shafts on
4WD models. (19) If valve body was also removed, adjust bands,
install valve body and install transmission oil pan and gasket.
(20) Lower vehicle and refill transmission with
Mopar ATF Plus, Type 7176. Use Mopar Dexron II if
ATF Plus is not readily available.

•

NP20I
TRANSFER CASE
21 - 34i (5) Verify that transfer case range lever is in Neu­

tral.
(6) Move shift lever bracket forward and retighten
bracket bolts (Fig. 3). Shift rod should not bind in shift lever and range lever. Rod should be slip-fit
both levers. (7) Shift transfer case into 4H range. Shift rod
should now be tension-fit in each lever. Shift lever
should be in 4H detent in gate and range lever should be fully into 4H position.
(8) Shift transfer case into 2H and 4L ranges to
verify correct adjustment.

SPEEDOMETER SERVICE
The speedometer driven gear, adapter and vehicle
speed sensor can be serviced with the transfer case in
the vehicle.
SPEEDOMETER COMPONENT REMOVAL/
INSTALLATION (FIG. 4) (1) Shift transfer case into Neutral.
(2) Raise vehicle.
(3) Disconnect wires at vehicle speed sensor.
(4) Loosen and disconnect coupling nut that at­
taches speed sensor to adapter. Then loosen and dis­ connect coupling nut attaching adapter to driven
gear.
(5) Remove vehicle speed sensor and speedometer
adapter. (6) Loosen and remove speedometer driven gear.
(7) Lubricate driven gear with engine or gear oil
and install gear in transfer case. Tighten gear to 11
N*m (100 in. lbs.) torque. (8) Install adapter and speed sensor. Tighten cou­
pling nuts to 17 N»m (150 in. lbs.) torque. (9) Connect wires to speed sensor.
(10) Lower vehicle.

TRANSFER CASE
REMOVAL
(1) Raise vehicle.
(2) Remove drain plug and drain transfer case lu­
bricant. (3) Disconnect vehicle speed sensor wires.
(4) Mark front/rear propeller shafts and yokes for
installation reference. (5) Disconnect and remove propeller shafts. Or dis­
connect shafts at transfer case yokes. Then move shafts aside for working clearance and secure them
to frame rails with wire. (6) Disconnect transfer case shift lever from range
lever on transfer case. (7) Support transfer case with transmission jack.
Secure transfer case to jack with safety chains. (8) Remove nuts attaching transfer case to trans­
mission adapter. (9) Slide transfer case rearward until it is clear of
transmission output shaft.
DISTANCE

SENSOR
ADAPTER
DRIVEN
GEAR
J9021-151

Fig.
4 Speedometer Components.
(10) Lower jack and move transfer case from under
vehicle.
(11) Remove old gasket material from transmission
adapter.

TRANSFER CASE
INSTALLATION
(1) Apply Mopar perfect seal, silicone sealer, or
Permatex No. 2 sealer to both sides of transfer case-
to-transmission gasket. Then position gasket on
transmission. (2) Align and seat transfer case on transmission.
Be sure transfer case input gear splines are aligned
with transmission output shaft. Align splines by ro­
tating transfer case rear output shaft yoke if neces­ sary. Do not install any transfer case attaching
nuts until the transfer case is completely seated against the transmission. (3) Install and tighten transfer case attaching nuts
to 47 N*m (35 ft. lbs.). (4) Install rear crossmember.
(5) Remove jack stand from under transmission.
(6) Align and connect propeller shafts.
(7) Connect vehicle speed sensor wires.
(8) Connect transfer case shift lever to range lever.
Tighten lever locknut to 10 N»m (90 in. lbs.). (9) Fill transfer case with recommended lubricant.
(10) Install transfer case fill plug.
(11) Install skid plate and skid plate crossmember.
(12) Lower vehicle.

TRANSFER CASE DISASSEMBLY
(FIG.
S) REAR RETAINER AND OUTPUT SHAFT
REMOVAL/DISASSEMBL
Y
(1) Loosen rear yoke nut until only 2-3 threads are
holding nut on shaft. (2) Remove bolts attaching rear bearing retainer to

case.

(3) Pull yoke rearward to start rear output shaft
out of clutch. (4) Remove rear yoke nut, washer, seal washer and
yoke.

21 - 350 NP241
TRANSFER CASE

• NP241 TRANSFER CASE

INDEl

page

Checking
Fluid
Level
351

Component Cleaning
and
Inspection
359
Fluid
Drain/Refill
351

General
Information
350

Recommended
Lubricant
.................. 350

Service
Diagnosis
....................... 350

Shift
Linkage
Adjustment
354

Speedometer Adapter/Distance
Sensor
Service
. 352
page

Speedometer Gear, Shaft
Seal,
Bearing
and
Retainer
Service
352

Transfer
Case
Assembly
.................. 361

Transfer
Case
Bearing Replacement
......... 360
Transfer
Case
Disassembly
................ 356

Transfer
Case
Identification ................ 350

Transfer
Case
Installation
................. 356

Transfer
Case
Removal
356

GENERAL
INFORMATION
The NP241 is a part-time transfer case with a low-
range gear system. It has three operating ranges
plus a Neutral position. The low range system pro­ vides a gear reduction ratio for increased low speed
torque capability. NP241 operating ranges are: 2-high, 4-high and 4-low. The NP241 has an aluminum, two-piece gear case.
Drive sprockets and an interconnecting drive chain are used to transmit engine torque to the propeller

shafts.
Four-wheel high and low ranges are undifferenti­
ated. The transfer case is not designed for continuous
operation in 4WD range on hard or paved surfaces.
Four wheel drive ranges are recommended for off
road operation, or on snow covered or similar low
traction surfaces. A front axle disconnect system is used to achieve
two-wheel drive mode. The axle disconnect vacuum motor is actuated by a vacuum switch on the transfer

case.
The switch is operated by the transfer case
range rod. Two-wheel drive range is used for on road, high­
way operation. The four-wheel drive ranges are for off road operation or when the vehicle is driven on
paved road surfaces covered by snow, ice or similar low traction elements.

TRANSFER CASE
IDENTIFICATION
An identification tag (Fig, 1) is attached to the rear
case of each NP241 transfer case. The tag provides
the transfer case model number, assembly number, serial number, and low range ratio. The transfer case serial number also represents the
date of build. For example, a serial number of 9-10-92 would represent September 10, 1992. Transfer case operating ranges are selected with a
floor-mounted shift lever. The shift lever is connected
to the transfer case range lever by an adjustable linkage rod (Fig. 2). A straight line shift pattern is
used. Range positions are marked on the gearshift le­
ver knob.
Fig.
1 NP 241 Transfer
Case

A synchronizer assembly in the transfer case al­
lows the unit to be shifted between 2H and 4H
ranges while the vehicle is in motion. The vehicle should be stopped before shifting into 4L range.

RECOMMENDED
LUBRICANT
Recommended lubricant for the NP241 is Mopar
ATF Plus, type 7176, or Dexron II™ automatic trans­
mission fluid. Use either fluid for topping off the
level, or refilling after service, or normal fluid
changes. Do not use anti-friction additives or similar prod­
ucts in the NP241 transfer case. Use the recom­
mended lubricant only. NP241 transfer case lubricant should be changed
at the intervals specified in the Maintenance Sched­
ule or after service repairs.

SERVICE
DIAGNOSIS
Before attempting to repair a suspected transfer
case malfunction, check all other driveline compo­
nents beforehand. The actual cause of a problem may be related to
such items as: front hubs, axles, propeller shafts,
wheels and tires, transmission, or clutch instead. If all other driveline components are in good condition

21 - 352 NP241
TRANSFER
CASE
—
•

Fig.
2
Loosening
Rear Retainer
Fig.
3 Removing/Installing Rear Retainer
(7) Install speedometer driven gear.
(8) Install drain plug. Tighten plug to 54 N-m (40
ft. lbs.). (9) Fill transfer case to edge of fill plug opening
with recommended transmission fluid. (10) Install fill plug. Tighten plug to 54 N-m (40 ft.

lbs.).
(11) Connect propeller shaft. Tighten attaching
bolts to 19 N-m (170 in. lbs.).
(12) Lower vehicle.

SPEEDOMETER
ADAPTER/DISTANCE
SENSOR

SERVICE

ADAPTER/SENSOR
REMOVAL
(1) Raise vehicle.
(2) Remove skid plate and crossmember for access,
if necessary. (3) Remove vehicle speed sensor from pinion gear
adapter (Fig. 4). On models with automatic transmis­
sion, remove sensor adapter as well.
(6) Fill transfer case to bottom edge of fill plug
opening with Mopar ATF Plus, or Dexron II auto­
matic transmission fluid.
(7) Install fill plug. Tighten plug to 54 N«m (40 ft.

lbs.).
(8) Lower vehicle.

SPEEDOMETER
GEAR, SHAFT
SEAL,
BEARING
AND RETAINER SERVICE
The front and rear yokes, output shaft seals, re­
tainers and bearings, and speedometer drive gear can all be serviced with the transfer case in the vehicle.
The following combined procedure outlines removal and installation of these components:

RETAINER
AND
SPEEDOMETER COMPONENT REMOVAL
(1) Raise vehicle.
(2) Remove fill and drain plugs and drain oil from
transfer case. (3) Mark propeller shaft and transfer case yoke for
alignment reference. (4) Disconnect propeller shaft. Secure shaft to un­
derside of vehicle. (5) Remove transfer case yoke retaining nut and
seal washer. Use Special Tool C-3281 to hold yoke
while removing nut. (6) Remove transfer case yoke. (7) Remove retainer seal (if seal or bushing is to be
replaced) using suitable tool.
(8) Install a new seal, if old seal was removed.
(9) Remove speedometer gear from rear retainer.
(10) Mark rear retainer for assembly alignment
reference. (11) Remove retainer attaching bolts and remove
retainer. Pry retainer with screwdrivers to remove it (Fig. 2). (12) Remove rear retainer (Fig. 3). Remove speed­
ometer drive gear, if necessary.
(13) Completely clean off old sealant.
(14) If the retainer or bearing are to be replaced,
remove bearing retainer snap ring from rear retainer
and remove bearing.

RETAINER
AND
SPEEDOMETER COMPONENT INSTALLATION
(1) Install rear output bearing in rear retainer and
install snap ring. (2) Apply a 5 mm (3/16 in.) wide bead of Mopar
Gasket Maker, Loctite 518, or Loctite 573 sealant to
mating surface of rear retainer.
(3) Align retainer case reference marks and install
rear retainer on case. (4) Install and tighten rear retainer attaching
bolts to 24 N«m (18 ft. lbs.). (5) Install output shaft seal (if required).
(6) Install yoke, a new yoke seal washer and yoke
nut. Tighten nut to 149 N-m (110 ft. lbs.) torque.

•

NP241 TRANSFER
CASE
21 - 313
LOCK OIL RING SEAL

ADAPTER

(OVERDRIVE
ONLY)
SPEEDOMETER

PINION
GEAR

ADAPTER
O-RING

SPEEDOMETER
ADAPTER

RETAINER
DISTANCE
SENSOR
J9021-99

Fig.
4 Speedometer
Components

(4) Check vehicle speed sensor mounting area in
pinion adapter. If transmission fluid is found in this area, adapter oil seal is leaking and will have to be
replaced.
(5) Remove bolt and retainer securing pinion gear
adapter to extension housing.

(6)
Carefully work adapter and gear out of hous­
ing. (7) Remove and discard adapter O-ring (Fig. 4).

SPEEDOMETER ADAPTER
OIL
SEAL
REPLACEMENT
Remove adapter oil seal if necessary. Start new
seal in adapter by hand. Then press seal into adapter
with Installer Tool C-4004 until tool bottoms (Fig. 5).
ADAPTER

LOCK
RING

TOOL
(3) Count number of teeth on pinion gear before
installing gear in adapter.
(4) Note range numbers on adapter face (Fig. 6).
These numbers correspond to number of teeth on pin­ ion. (5) Install adapter in housing.

(6)
Rotate adapter until required range numbers
are at six o-clock position (Fig. 6). Be sure adapter
range numbers correspond to number of teeth on pin­ ion. (7) Seat adapter in housing.
(8) Install adapter retainer. Tighten retainer bolt
to 11 N-m (100 in. lbs.) torque.
(9) Install vehicle speed sensor. Tighten sensor
coupling nut to 17 N-m (150 in. lbs.) torque and in­
stall sensor wires.
(10) Check and correct transfer case lubricant level
if necessary.
(11) Install skid plate and crossmember if re­
moved. (12) Lower vehicle.
ADAPTER

O'CLOCK
POSITION

Fig.
6 Indexing Speedometer Adapter
RH75
OIL
SEAL

RH263

Fig.
5
Replacing
Speedometer Adapter
Seal

ADAPTER/SENSOR
INSTALLATION
CAUTION:
Before installing
the
pinion arid adapter

assembly
make sure
the
adapter flange
and its
mounting area
in
transfer case
are
perfectly clean. Dirt
or
sand
will
cause misalignment resulting
in

speedometer pinion gear damage.

(1) Thoroughly clean adapter flange and adapter
mounting surface in extension housing. These sur­
faces must be clean for proper adapter alignment and speedometer operation.
(2) Lubricate adapter oil seal and O-ring with
transmission fluid.

21 - 356 NP241
TRANSFER
CASE

•
TRANSFER
CASE
REMOVAL

(1) Raise vehicle.
(2) Position drain oil container under transfer case.
(3) Remove transfer case drain plug and drain lu­
bricant into container. (4) Disconnect wires at vehicle speed sensor.
(5) Disconnect vacuum hoses at vacuum switch.
(6) Disconnect transfer case shift lever from range
lever. (7) Remove skid plate and skid plate crossmember.
(8) Support transmission with jack stand.
(9) Remove rear crossmember.
(10) Mark front and rear propeller shaft yokes for
assembly reference. (11) Remove front and rear propeller shafts.
(12) Support transfer case with suitable jack. Se­
cure transfer case to jack with safety chains. (13) Remove nuts attaching transfer case to trans­
mission. (14) Move transfer case assembly rearward until
free of transmission output shaft. (15) Lower jack and move transfer case from under
vehicle. (16) Remove all gasket material from rear of
transmission adapter housing.

TRANSFER CASE
INSTALLATION
(1) Apply Mopar Perfect Seal, silicone sealer, or
Permatex No. 2 to both sides of transfer case-to-
transmission gasket. Then position gasket on trans­ mission.
(2) Align and seat transfer case on transmission.
Be sure transfer case input gear splines are aligned
with transmission output shaft. Align splines by ro­
tating transfer case rear output shaft yoke if neces­ sary. Do not install any transfer case attaching
nuts until the transfer case is completely seated against the transmission.
(3) Install and tighten transfer case attaching nuts
to 47 N*m (35 ft. lbs.). (4) Install rear crossmember.
(5) Remove jack stand from under transmission.
(6) Align and connect propeller shafts.
(7) Connect speed sensor wires and vacuum switch

hoses.
(8) Connect transfer case shift lever to range lever.
Tighten lever locknut to 10 N*m (90 in. lbs.). (9) Fill transfer case with recommended transmis­
sion fluid. (10) Install transfer case fill plug.
(11) Install skid plate and skid plate crossmember.
(12) Lower vehicle.

TRANSFER CASE DISASSEMBLY
(2) Remove rear retainer (Figs. 2-3). Remove and
discard retainer seal. (3) Remove upper snap ring that retains speedom­
eter gear on shaft. Then remove speedometer gear (Fig. 1).

Fig.
1
Snap Ring
And Speedometer Gear
Removal/
Installation

(4) Remove shaft lower snap ring (Fig. 2)
(5) Remove oil pump. Remove and discard oil
pump seal. (6) Loosen rear case by prying corners loose to
break sealant bead (Fig. 3).

Fig.
2 Removing/Installing Shaft
Lower
Snap Ring
(7) Remove rear case from front case (Fig. 4)
(8) Remove oil pickup screen, tube and magnet
from rear case.

DRIVE CHAIN, SPROCKET, SHIFT FORK
AND

MAINSHAFT SHAFT REMOVAL
(1) Remove mode spring from shift rail (Fig. 5).
(2) Remove driven sprocket snap ring (Fig. 6).
(3) Remove sprocket and drive chain (Fig. 7). Tilt
mainshaft for clearance if necessary.
RETAINER
AND
REAR CASE
REMOVAL

(1) Remove indicator switch from front case.

•
TRANSMISSION/TRANSFER
CASE
SPECIFICATIONS
21 - 367

DESCRIPTION

TORQUE

Backup Light Switch 22-34 N-m (193-300 in.
lbs.)

Countershaft Bearing Plate Bolts 19-26 N-m (170-230 in.
lbs.)

Fifth Gear Nut 339-475 N-m (250-350
ft. lbs.)

Drain
and
Fill Plugs 34-47 N-m (25-35
ft. lbs.)

Front Bearing Retainer Bolts 27-34 N-m (235-305 in.
lbs.)

Mainshaft Bearing Plate Bolts 19-26 N-m (170-230 in.
lbs.)
PTO
Cover Bolts 27-54 N-rn (20-40
ft.
lbs.)

Extension/Adapter Housing Bolts 41-68 N-m (30-50
ft.
lbs.)

Reverse Inhibitor Screws
8-14
N-m (75-115 in.
lbs.)

Shift Cover Bolts 27-31 N-m (216-276 in.
lbs.)

J9221-12
DESCRIPTION

TORQUE

Bearing Preload

Case
Bolts
Distance
Sensor
Coupling
Nut

Detent
Bolt

Drain/Fill
Plugs

Front/Rear Yoke Nuts Indicator Switch

Range
Lever
Locknut..
Rear
Retainer
Bolts
...

Speedometer Driven Gear
Nut

Transfer
Case
Mounting
Nuts.
. . . . 7-41
N»m
(5-30
in.
lbs.)

31
mm (23 ft. lbs.)
17
N»m
(150
in.
lbs.)

31
N»m (23 ft. lbs.) 54
N«m
(40 ft. lbs.) 176
N®m
(130 ft. lbs.)
24
N«m
(18 ft. lbs.)
10 N*m (90 in. lbs.)
54
N«m
(40 ft. lbs.)

11
N»m (100
in.
lbs.)
54
N«m
(40 ft. lbs.) J9221-250

G360
SET-TO
TORQUE
SPECIFICATIONS
NP241
TORQUE SPECIFICATIONS

Clutch Housing Bolts
47 N-m (35 ft. lbs.)
Drain/Fill Plugs
47 Nm (35 ft. lbs.)

Front/Rear Bearing
Retainer Bolts
.
22-30
N-m
(16-22
ft. lbs.)

Rear Crossmember Bolts/Nuts
. 68 N-m (50 ft. lbs.)

Shift Cover Bolts 22-30
N-m
(16-22
ft. lbs.)

Skid Plate
And
Crossmember Bolts/Nuts
41 N-m (30 ft. lbs.)

Transfer Case Attaching Nuts
47 Nm (35 ft. lbs.)

Transmission-To-Clutch Housing Bolts
68 N-m (35 ft. lbs.)

U-Joint Clamp Bolts
19 Nm (14 ft. lbs.)

Yoke
Nut 380 N-m (280 ft. lbs.)

J9321-333
DESCRIPTION
TORQUE

Oil Pump
Screws
1.4-1.8
N«m (12-15 in. lbs.)

Yoke
Nut (front/rear) 176-271 N»m (130-200 ft. lbs.)
Vacuum Switch
20-34 N«m (15-25 ft. lbs.)
Range
Lever
Nut
27-34 N»m (20-25 ft. lbs.)

Front
Case-To-Rear
Case
Bolts
.. 27-34 N»m (20-25 ft. lbs.)
Rear
Retainer
Bolts
47-61 N»m (35-45 ft. lbs.)

Extension
Housing
Bolts
35-46 N»m (26-34 ft. lbs.)

Drain/Fill
Plugs
41-54 N*m (30-40 ft. lbs.)

Detent
Plug
16-24
N@m
(12-18 ft. lbs.)
Front
Bearing
Retainer
Bolts
16-24 N»m (12-18 ft. lbs.)

Vacuum Switch
20-34 N*m (15-25 ft. lbs.)
Rear
Case
Stud
Nut 27-34 N*m (20-25 ft. lbs.)

Strut
Mounting Bracket Stud
Nut 27-34 N»m (20-25 ft. lbs.)
J9221-248

NV4500
TORQUE
SPECIFICATIONS
NP205
TORQUE
SPECIFICATIONS

•

EMISSION
CONTROL
SYSTEMS
25
- 1
CONTENTS

page page

AIR INJECTION
SYSTEM-o
9L
HDC-GAS EVAPORATIVE EMISSION CONTROLS
6
ENGINE
15
EXHAUST EMISSION CONTROLS
10

COMPONENT
REMOVAL/INSTALLATION
17
GENERAL INFORMATION
1

GENERAL
INFORMATION

Throughout this group, references are made
to
par­
ticular vehicle models
by
alphabetical designation
or

by the particular vehicle nameplate.
A
chart showing a breakdown
of
alphabetical designations
is
included
in
the
Introduction section
at
the
beginning
of
this
manual.
The 5.9L (V-8) gas powered engine will
be
referred
to
in
this group
as
either the: LDC (Light Duty Cy­ cle)
or
HDC (Heavy Duty Cycle) engine.
The
HDC
engine can
be
easily identified
by
the
use
of
an en­

gine mounted
air
injection pump. The 3.9L/5.2L/5.9L
LDC engine will not use
an
air
injection pump.
Maintenance requirements for LDC and HDC emis­
sion systems differ because
of
different load
and
op­
erating conditions. This section will cover emission control systems
for

the 3.9L (V-6), 5.2L (V-8), 5.9L LDC (V-8), 5.9L HDC (V-8) and 5.9L (in-line six cylinder) diesel engines.

SERVICE
REMINDER INDICATOR
(SRI)
LIGHT
The instrument panel mounted SRI light was for­
merly referred
to as the
emission maintenance
re­
minder (EMR) light.
It is
used with 5.9L HDC-gas
powered engines only.
It is
not
used with diesel
en­
gines.

The SRI system
is
incorporated into the powertrain
control module (PCM)
(the
PCM
was
formerly
re­

ferred
to as the
engine controller
or
SBEC).
The

PCM records
the
vehicles mileage and stores
it
into
memory every
8
miles. At that time, the PCM checks
for the 60,000 and 82,500 mileage trip points. When
the current mileage matches one
of
the above men­
tioned trip points,
the
SRI light
is
activated.
The following parts are
to
be replaced
at
either the
indicated mileage
or
when the SRI light remains
on

when the key
is in
the ON position. After performing
the required maintenance,
the
SRI light must
be
re­ set
to
turn the light
off.

96,000
km
(60,000 miles):
• Replace EGR Valve
• Clean EGR passage • Replace PCV Valve
132,000
km
(82,500 miles):
• Replace Oxygen Sensor
Refer
to
Group
0,
Lubrication and Maintenance
for

all required maintenance schedules.
Failure
to
perform
the
required maintenance
and

only reset the SRI light may be
a
violation of federal
law. Only after performing
the
required mainte­
nance, should the SRI light
be
reset.

RESETTING
SRI
LIGHT
(1) Connect
the
DRB
II
scan tool
to
the
data link
connector (Fig.
1)
in
the engine compartment.
TORQUE CONVERTER
CLUTCH RELAY
A/C
CLUTCH RELAY
.
STARTER RELAY

AUTO
SHUTDOWN RELAY FUEL PUMP RELAY DATA LINK
CONNECTOR POWERTRAIN
CONTROL
MODULE
J9314-164

Fig.
1
Data
Link
Connector
(2) Refer
to
DRB
II
scan tool operation
in
the ap­

propriate Powertrain Diagnostic Procedures manual. (3) Reset SRI light.

VEHICLE
EMISSION CONTROL INFORMATION
(VECI)
LABEL
All vehicles equipped with
a
gasoline powered
en­

gine have
a
VECI label. The 3.9L/5.2L/5.9L LDC-gas powered engine will
have
a
label that combines both emission control
in­

formation and vacuum hose routing.
EMISSION CONTROL
SYSTEMS

EMISSION
CONTROL SYSTEMS
25 - :

CALIFORNIA VEHICLE EMISSION CONTROL INFORMATION LABEL-TYPICAL

or,

o_ UJ
u_

U
^
>
CO

CQ

o
IMPORTANT
VEHICLE
INFORAAATION

THIS VEHICLE CONFORMS
TO
U.S.
EPA AND STATE
OF
CALIFORNIA REGULATIONS APPLICABLE
TO 1993
MODEL YEAR NEW
LIGHT-DUTY

TRUCKS
AND
MEDIUM-DUTY VEHICLES PROVIDED
THAT
THIS VEHICLE
IS
ONLY INTRODUCED
INTO
COMMERCE FOR
SALE
IN THE

STATE
OF
CALIFORNIA.
*
BASIC
IGNITION TIMING
AND
IDLE FUEL/AIR
MIXTURE HAVE BEEN
PRESET
AT THE
FACTORY.
SEE THE
SERVICE MANUAL
FOR
PROPER
PROCEDURES
AND
OTHER
ADDITIONAL
INFORMATION.

o
ADJUSTMENTS MADE
BY
OTHER
THAN
APPROVED
SERVICE MANUAL PROCEDURES
MAY
VIOLATE
FEDERAL
AND
STATE
LAWS.

CAUTION:
APPLY
PARKING BRAKE
WHEN
SERVICING
VEHICLE.
5.2
LITER

PCR360T5FHB2
PTAPG
SPARK
PLUGS

.035
in.
GAP RC12YC NO ADJUSTMENTS NEEDED

RHC/CO/NOx
STDS.
.50/9.0/1.0
TEE
CONNECTOR

W/ORIFICE
TO

ATMOSPHERE
ROLLOVER
VALVE

W/ORIFICE

/

PCV
VALVE-

TO
CLIMATE
CONTROL,

VEHICLE SPEED
CONTROL,
4X4
AXLE

(WHEN
EQUIPPED)

INTAKE
MANIFOLD"
ORIFICE
—
M

r-
M
EVAP
PURGE

SOLENOID
FILTER
THROTTLE
BODY
FUEL
TANK PRESSURE
RELIEF/

ROLLOVER
VALVE
W/ORIFICE

FUEL

PRESSURE

REGULATOR
1

r—O
O^-CRANKCASE
TO
AIR

CLEANER
APPLICABLE
TO
35

GALLON
FUEL
TANK
ONLY
J9325-23

CANADA VEHICLE EMISSION CONTROL INFORMATION LABEL-ATYPICAL
VEHICLE
EMISSION
CONTROL
INFORAAATION

THIS
VEHICLE
WAS
BUILT
FOR
SALE
IN
CANADA
AND WAS
DESIGNED
TO
MEET
THE
EMISSION
REQUIREMENTS
OF THE
CANADA
MOTOR
VEHICLE
ACT.
IT
WAS NOT
DESIGNED
TO
COMPLY
WITH
THE

REQUIREMENTS
OF
OTHER
COUNTRIES.

'
BASIC
IGNITION TIMING
AND
FUEL
INJECTION
MIXTURE HAVE BEEN
PRESET
AT
THE
FACTORY.
ADJUSTMENTS
SHOULD
NOT
BE
MADE
DURING
ROUTINE
SERVICE.

CAUTION:
APPLY
PARKING BRAKE
WHEN
SERVICING
VEHICLE.
5.2
LITRES

SPARK
PLUGS
0.9
mm GAP
RC12YC

RENSEIGNEMENTS RELATIFS
AU
SYSTEME
ANTIPOLLUTION

LE
PRESENT
VEHICULE
A
ETE
FABRIQUE'
POUR ETRE
VENDU
AU
CANADA
ET
IL
A
ETE
CONCU
DE

MANIERE
A
SE
CON
FORMER
AUX
NORMES
ANTIPOLLUTION
DE LA LOI SUR LA
SECURITE
DES
VEHICULES
AUTOMOBILES
DU
CANADA.
IL
N'EST
PAS
DESTINE'
A SE
CON
FORMER
AUX
NORMES
D'AUTRES
PAYS.

*
LE
CALAGE
DE
L'ALLUMAGE
INITIAL
ET LE
MELANGE
D'INJECTION
D'ESSENCE
ONT
ETC:
PREREGLE'S
A
L'USINE.
N'EFFECTUEZ
AUCUN
REGLAGE
LORS
DE
TRAVAUX
D'ENTRETIEN
REGULIERS.

AVERTISSEMENT:
SERREZ
LE
FREIN
DE
STATIONNEMENT
POUR
FAIRE
L'ENTRETIEN
OU
LA
RE'PARATION
DU
VEHICULE.
5.2
LITRES

,
BOUGIES

ECARTEMENT
0.9 mm
RC12YC

ROLLOVER VALVE W/ORIFICE CLAPET DE DECHARGE AVEC AJUTAGE EVAP PURGE SOLENOID

E'LECTROVALVE
DE
_
FUEL TANK PURGE
DU
FILTRE RESERVOIR
D'ESSENCE
-

A CHARBON ACTIF /
TO CLIMATE CONTROL,
VEHICLE SPEED CONTROL.
4X4 AXLE (WHEN EQUIPPED)
VERS LA COWMAN DE
DE

TEMPERATURE. LE REGULATEUR DE VITESSE, LESSIEU
4X4 (LORSQU'AINSI EQUIPE')
INTAKE MANIFOLD ORIFICE AJUTAGE DE LA TUBULURE D'ADMISSION FUEL TANK PRESSURE RELIEF/
I

ROLLOVER VALVE W/ORIFICE
CLAPET DE DECHARGE
DU
RESERVOIR D'ESSENCE AVEC AJUTAGE FUEL PRESSURE REGULATOR
REGULATEUR DE PRESSION DE CARBURANT CHECK VALVE W/ORIFICE
SOUPAPE
A
DOUBLE EFFET
-
AVEC AJUTAGE AAAP SENSOR
"

CAPTEUR DE PRESSION
ABSOLUE DE LA TUBULURE THROTTLE BODY
CORPS DE PAPILLON APPLICABLE
TO
35

GALLON FUEL TANK ONLY
UNIQUEMENT APPLICABLE
AU

RESERVOIR D'ESSENCE DE
132
L