Opel Frontera UBS. Service manual — part 979
WHEELS AND TIRES 3E – 5
WHEELS
REPLACEMENT
Damaged wheels and wheels with excessive runout must
be replaced.
Wheel Runout at Rim (Based on Hub bore.)
GENERAL BALANCE PROCEDURE
Deposits of mud, etc. must be cleaned from the inside of
the rim.
The tire should be inspected for the following: match
mount paint marks, bent rims, bulges, irregular tire wear,
proper wheel size and inflation pressure. Then balance
according to the equipment manufacturer’s
recommendations.
There are two types of wheel and tire balance.
Static balance is the equal distribution of weight around
the wheel.
Assemblies that are statically unbalanced cause a
bouncing action called tramp. This condition will
eventually cause uneven tire wear.
Dynamic balance is the equal distribution of weight on
each side of the wheel center-line so that when the tire
spins there is not tendency for the assembly to move from
side to side. Assemblies that are dynamically unbalanced
may cause shimmy.
WARNING:
STONES SHOULD BE REMOVED FROM THE TREAD TO
AVOID OPERATOR INJURY DURING SPIN BALANCING
AND TO OBTAIN A GOOD BALANCE.
Steel
Aluminum
A Vertical play:
Less than
mm(in)
1.5 (0.059)
0.7 (0.028)
B Horizontal play:
Less than
mm(in)
1.5 (0.059)
0.7 (0.028)
3E – 6 WHEELS AND TIRES
BALANCING WHEEL AND TIRE
ON-VEHICLE BALANCING
On-Vehicle balancing methods vary with equipment and
tool manufacturers. Be sure to follow each manufacturer’s
instructions during balancing operation.
OFF-VEHICLE BALANCING
Most electronic off-vehicle balancers are more accurate
than the on-vehicle spin balancers. They are easy to use
and give a dynamic balance. Although they do not correct
for drum or disc unbalance (as on-vehicle spin balancing
does), they are very accurate.
4A1–1
DIFFERENTIAL (FRONT)
DRIVELINE/AXLE
CONTENTS
Differential (Front)
4A1
. . . . . . . . . . . . . . . . . . . . . . .
Differential (Rear/220mm)
4A2A
. . . . . . . . . . . . . . . .
Differential (Rear/244mm)
4A2B
. . . . . . . . . . . . . . . .
Driveline Control System (Shift on the Fly)
4B1
. .
Driveline Control System (TOD)
4B2
. . . . . . . . . . .
Driveshaft System
4C
. . . . . . . . . . . . . . . . . . . . . . .
Transfer Case (Standard Type)
4D1
. . . . . . . . . . .
Transfer Case (TOD)
4D2
. . . . . . . . . . . . . . . . . . . .
DIFFERENTIAL (FRONT)
CONTENTS
Service Precaution
4A1–1
. . . . . . . . . . . . . . . . . . . . . .
Front Drive Axle
4A1–2
. . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis
4A1–2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pinion Shaft Oil Seal
4A1–3
. . . . . . . . . . . . . . . . . . . . .
Pinion Shaft Oil Seal and Associated Parts
4A1–3
Removal
4A1–3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
4A1–4
. . . . . . . . . . . . . . . . . .
Installation
4A1–4
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Drive Axle Assembly
4A1–5
. . . . . . . . . . . . . . .
Front Drive Axle Assembly and
Associated Parts
4A1–5
. . . . . . . . . . . . . . . . . . . . . .
Removal
4A1–5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
4A1–7
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential Assembly
4A1–9
. . . . . . . . . . . . . . . . . . . .
Disassembled View
4A1–9
. . . . . . . . . . . . . . . . . . . .
Disassembly
4A1–10
. . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly
4A1–12
. . . . . . . . . . . . . . . . . . . . . . . . . .
Differential Cage Assembly
4A1–21
. . . . . . . . . . . . . . .
Disassembled View
4A1–21
. . . . . . . . . . . . . . . . . . . .
Disassembly
4A1–21
. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
4A1–22
. . . . . . . . . . . . . . . . . .
Reassembly
4A1–23
. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications
4A1–25
. . . . . . . . . . .
Special Tools
4A1–28
. . . . . . . . . . . . . . . . . . . . . . . . . .
Service Precaution
WARNING: IF SO EQUIPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE REFORMING SERVICE ON
OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED , do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally,such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specification. Following these
instructions can help you avoid damage to parts and
systems.
DIFFERENTIAL (FRONT)
4A1–2
Front Drive Axle
Diagnosis
Condition
Possible cause
Correction
Oil Leak At Front Axle
Worn or defective oil seal.
Replace the oil seal.
Front axle housing cracked.
Repair or replace.
Oil Leak At Pinion Shaft
Too 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
Joint
Broken 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.
Acceleration
Worn 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 Speeds
Out of balance or out of round tires.
Balance or replace.
Front end out of alignment.
Align.
Noises in Front Axle
Insufficient 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 Pulls
Wheel 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 Shimmy
Wheel 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.
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