Back OPEL FRONTERA 1998 Workshop Manual

4C–3 DRIVE SHAFT SYSTEM
Diagnosis
ConditionPossible causeCorrection
Oil Leak At Front AxleWorn or defective oil seal.Replace the oil seal.
Front axle housing cracked.Repair or replace.
Oil Leak At Pinion ShaftToo much gear oil.Correct the oil level.
Oil seal worn or defective.Replace the oil seal.
Pinion flange loose or damaged.Tighten or replace.
Noises In Front Axle Drive Shaft
JointBroken or worn drive shaft joints and
bellows (BJ and DOJ).Replace the drive shaft joints and
bellows.
“Clank” When Accelerating From
“Coast”Loose drive shaft joint to output shaft
bolts.Tighten.
Damaged inner drive shaft joint.Replace.
Shudder or Vibration During
Acceleration
Excessive drive shaft joint angle.Repair.
AccelerationWorn or damaged drive shaft joints.Replace.
Sticking spider assembly (inner drive
shaft joint).Lubricate or replace.
Sticking joint assembly (outer drive
shaft joint).Lubricate or replace.
Vibration At Highway SpeedsOut of balance or out of round tires.Balance or replace.
Front end out of alignment.Align.
Noises in Front AxleInsufficient gear oil.Replenish the gear oil.
Wrong or poor grade gear oil.Replace the gear oil.
Drive pinion to ring gear backlash
incorrect.Adjust the backlash.
Worn or chipped ring gear, pinion
gear or side gear.Replace the ring gear, pinion gear or
side gear.
Pinion shaft bearing worn.Replace the pinion shaft bearing.
Wheel bearing worn.Replace the wheel bearing.
Differential bearing loose or worn.Tighten or replace.
Wanders and PullsWheel bearing preload too tight.Adjust the wheel bearing preload.
Incorrect front alignment.Adjust the front alignment.
Steering linkage loose or worn.Tighten or replace.
Steering gear out of adjustment.Adjust or replace the steering gear.
Tire worn or improperly inflated.Adjust the inflation or replace.
Front or rear suspension parts loose
or broken.Tighten or replace.
Front Wheel ShimmyWheel bearing worn or improperly
adjusted.Adjust or replace.
Incorrect front alignment.Adjust the front alignment.
Worn ball joint or bush.Replace the ball joint or bush.
Steering linkage loose or worn.Tighten or replace.
Steering gear out of adjustment.Tighten or replace.
Tire worn or improperly inflated.Replace or adjust the inflation.
Shock absorber worn.Replace the shock absorber.

4C–4
DRIVE SHAFT SYSTEM
Rear Axle Shaft
Rear Axle Shaft and Associated Parts
420RW014
Legend
(1) Brake Caliper
(2) Brake Disc
(3) Wheel Pin
(4) Axle Shaft Assembly
(5) Back Plate
(6) Parking Brake Assembly
(7) Bearing Holder(8) Bearing
(9) Retainer
(10) Snap Ring
(11) Bolt
(12) Nut
(13) Antilock Brake System (ABS) Speed Sensor (if
so equipped)
Removal
1. Raise the vehicle.
2. Remove tires and wheels. Refer to Wheel in Steering
section.3. Remove brake caliper. Use a wire to attach the brake
caliper to the frame. Refer to Disk Brakes in Brake
section.
4. Remove brake disc.
5. Remove ABS sensor (if so equipped).
6. Remove Parking brake assembly. Refer to Parking
Brakes in Brake section.

4C–5 DRIVE SHAFT SYSTEM
7.Remove the parking brake cable mounting
bolts(Behind the back plate)(1).
311RS001
8. Remove the bearing holder mounting nuts.
9. Remove axle shaft assembly.
NOTE: Be sure not to damage the oil seal.
10. Remove snap ring.
11. Using a bearing remover 5–8840–2295–0 and press,
remove retainer together with the bearing holder.
420RW024
12. Remove bearing.
13. Remove bearing holder.
14. Remove back plate.15. Remove the wheel pins using a remover
5–8840–0079–0.
420RW023
Inspection and Repair
Make necessary correction or parts replacement if wear,
corrosion or any other abnormal conditions are found
through inspection.
Visual Check:
Check the following parts for wear, damage, noise or any
other abnormal conditions:
1. Axle shaft
2. Bearing
When checking the axle shaft, pay special attention to the
splined portions and replace the shaft if distortion or step
wear is noticeable. Correct slight step wear with a grinder.
420RS008

4C–6
DRIVE SHAFT SYSTEM
Axle Shaft Run–out
Limit: 1.0 mm (0.039 in)
420RW025
Axle Shaft Flange Run–out
Limit: 0.08 mm (0.003 in)
420RS010
Oil Seal Replacement
Remove the oil seal carefully not to damage the bearing
holder bore .
When installing, use oil seal installer 5–8840–2310–0.
420RW026
Installation
1. Install wheel pin.
2. Install back plate.
3. Install bearing holder.
4. Install bearing.
5. Install retainer by using a bearing installer
5–8840–2296–0, press fit together with the bearing.
420RW027
6. Install snap ring.
7. Install axle shaft assembly.
NOTE: Be sure not to damage the oil seal.
8. Tighten the bearing holder mounting nut to the
specified torque.
Torque: 74Nꞏm (7.5kgꞏm/54 Ib ft)

4C–7 DRIVE SHAFT SYSTEM
9. Fix the parking brake cable mounting bolt (Behind the
back plate).
10. Install parking brake assembly, refer to Parking
Brakes in Brake section.
11. Install antilock brake system sensor (if so equipped).
12. Install brake disc.
13. Install brake caliper, refer to Disk Brakes in Brake
section.

4C–39 DRIVE SHAFT SYSTEM
401RW053
401RW052
4. Remove bolt, nut and washer (Front axle side).
5. Remove bolt, nut and washer (Transfer side).
6. Remove front propeller shaft.
NOTE: If equipped with torque on demand (TOD), when
removing, installing or carring for front propeller shaft, be
sure to wind a piece of cloth round the part of the boot with
which fittings may interfere so that the boot can be
protected. The boot may be damaged if bending force is
applied to the constant velocity joint of the shaft.
401RW051
Installation
NOTE: Never install the shaft assembly backwards.
Completely remove the black paint from the connecting
surface of flange coupling on each end of propeller shaft.
Clean so that no foreign matter will be caught in between.
1. Align the mark which was applied at removal. Install
front propeller shaft and tighten the bolts to the
specified torque.
Torque:63Nꞏm (6.4kgꞏm/46lbft)
2. Install the exhaust and transfer protectors.
3. After installing the propeller shaft, be sure to apply
black paint (1) to exposed area (other than
connecting surface) of the entire surface of flange
coupling .
401RS019

4C–43 DRIVE SHAFT SYSTEM
Play in Universal Joint
Limit: Less than 0.1 mm (0.004 in)
401RS010
Constant Velocity Joint
NOTE: LJ and BJ constant velocity joints are
unremovable types. Check the joint for play and the boot
for damage, wear, and leak of grease. If abnormality is
found, replace propeller shaft as an assembly.
Play in Constant Velocity Joint
Fix the shaft in a vise throrgh pieces of wood, and try to
move the joint vertically, right and left, and back and forth
to make sure of smooth motions and no remarkable play.
401RW050
401RW049
Boot of Constant Velocity Joint
Check the boot (2) for crack, damage and grease leak,
and the boot band (1) for loosening and damage. Check
the both sides of the joint and make sure that there is no
leak of grease from the cover press-in parts(3).
401RW048

4C–49 DRIVE SHAFT SYSTEM
Removal
1. Jack up the vehicle and support it on the chassis
stands.
2. Gear shift lever should be placed in neutral position
and parking brake released.
NOTE: Apply alignment marks on the flange at the rear
propeller shaft both front and rear side.
401RS023
3. Remove bolt, nut and washer (Rear axle side).
4. Remove bolt, nut and washer (Transfer side).
5. Remove rear propeller shaft.
Installation
NOTE: Never install the shaft assembly backwards.
1. Completely remove the black paint from the
connecting surface of flange coupling on each end of
propeller shaft. Clean so that no foreign matter will be
caught in between.
2. Align the mark which is applied at removal .
Install rear propeller shaft and tighten the bolts to the
specified torque.
Torque: 63 Nꞏm (6.4 kgꞏm/46 lb ft)3. After installing the propeller shaft, be sure to apply
black paint (1) to exposed area (other than
connecting surface) of the entire surface of flange
coupling .
401RS022

4D2–13 TRANSFER CASE (TOD)
2. Strike the speed gear and tone wheel with a rod or
other appropriate tool from the outside of the transfer
cover assembly, and remove the ball bearing and
speed gear and tone wheel.
NOTE: Be careful not to damage the speed gear teeth.
266RW018
3. Remove the stopper plate on the back with a
precision screwdriver or other appropriate tool
starting from the small lock of the plate.
NOTE: Be careful not to damage the stopper plate during
the work.
261RW042
4. Using a terminal pull-out tool or an equivalent tool,
push down the lock to unlatch the terminal for the coil
assembly, and pull the terminal out.
NOTE: Be careful not to damage other terminals.
261RW032
5. Remove the fixing nuts of the coil assembly from the
outside of the transfer cover assembly. Remove the
coil assembly from the transfer cover.
261RW030

5A–4
BRAKE CONTROL SYSTEM
normal braking when a malfunction has occurred in the
ABS.
The EHCU has a self-diagnosing function which can
indicate faulty circuits during diagnosis.
The EHCU is mounted on the engine compartment front
right side. It consists of a Motor, Plunger Pump, Solenoid
Valves and Check Valve.
On the outside, the relay box containing a motor relay and
a valve relay is installed.
Solenoid Valves: Reduces or holds the caliper fluid
pressure for each front disc brake or both rear disc brakes
according to the signal sent from the EHCU.
Reservoir: Temporarily holds the brake fluid that returns
from the front and rear disc brake caliper so that pressure
of front disc brake caliper can be reduced smoothly.
Plunger Pump: Feeds the brake fluid held in the reservoir
to the master cylinder.
Motor: Drives the pump according to the signal from
EHCU.
Check Valve: Controls the brake fluid flow.
ABS Warning Light
821RW033Vehicles equipped with the Anti-lock Brake System have
an amber “ABS” warning light in the instrument panel.
The “ABS” warning light will illuminate if a malfunction in
the Anti-lock Brake System is detected by the Electronic
Hydraulic Control Unit (EHCU). In case of an electronic
malfunction, the EHCU will turn “ON” the “ABS” warning
light and disable the Anti-lock braking function.
The “ABS” light will turn “ON” for approximately three
seconds after the ignition switch is to the “ON” position.
If the “ABS” light stays “ON” after the ignition switch is the
“ON” position, or comes “ON” and stays “ON” while
driving, the Anti-lock Brake System should be inspected
for a malfunction according to the diagnosis procedure.
Wheel Speed Sensor
It consists of a sensor and a rotor. The sensor is attached
to the knuckle on the front wheels and to the axle shaft
bearing holder on the rear wheels.
The rotor is press-fit in the axle shaft.The flux generated from electrodes magnetized by a
magnet in the sensor varies due to rotation of the rotor,
and the electromagnetic induction generates alternating
voltage in the coil. This voltage draws a “sine curve” with
the frequency proportional to rotor speed and it allows
detection of wheel speed.
G-Sensor
The G-sensor installed inside the center console detects
the vehicle deceleration speed and sends a signal to the
EHCU. In 4WD operation, all four wheels may be
decelerated in almost the same phase, since all wheels
are connected mechanically.
This tendency is noticeable particularly on roads with low
friction coefficient, and the ABS control is adversely
affected.
The G-sensor judges whether the friction coefficient of
road surface is low or high, and changes the EHCU’s
operating system to ensure ABS control.
Normal and Anti-lock Braking
Under normal driving conditions, the Anti-lock Brake
System functions the same as a standard power assisted
brake system. However, with the detection of wheel
lock-up, a slight bump or kick-back will be felt in the brake
pedal. This pedal “bump” will be followed by a series of
short pedal pulsations which occurs in rapid succession.
The brake pedal pulsation will continue until there is no
longer a need for the anti-lock function or until the vehicle
is stopped. A slight ticking or popping noise may be heard
during brake applications when the Anti-lock features is
being used.
When the Anti-lock feature is being used, the brake pedal
may rise even as the brakes are being applied. This is
also normal. Maintaining a constant force on the pedal
will provide the shortest stopping distance.
Brake Pedal Travel
Vehicles equipped with the Anti-lock Brake System may
be stopped by applying normal force to the brake pedal.
Although there is no need to push the pedal beyond the
point where it stops or holds the vehicle, by applying more
force the pedal will continue to travel toward the floor.
This extra brake pedal travel is normal.
Acronyms and Abbreviations
Several acronyms and abbreviations are commonly used
throughout this section:
ABS
Anti-lock Brake System
CKT
Circuit
DLC
Data Link Connector
EHCU
Electronic Hydraulic Control Unit
FL
Front Left