1988 PONTIAC FIERO wheel alignment

1988
SER
This manual applies to the 1988 Pontiac Firebird Models.
It contains the latest product information available at the
time of publication approval. lnformation pertaining to
the operation of the vehicle is contained in the Owner's
Manual which accompanies each vehicle. The right is
reserved to make changes at any time without notice.
Any references to brand names in this manual is intended
merely as an example of the types of
lubricant% tools,
materials, etc, recommended for use in servicing 1988
Pontiac Models. In all cases, an equivalent may be used.
PONTIAC DIVISION
GENERAL
MOTORS CORPORATION
PONTIAC, MICHIGAN 48053
1987 General Motors Corp. All Rights Reserved.
No part of this publication may be reproduced, stored in any
retrieval system or transmitted in any form or by any means,
including but not limited to electronic, mechanical,
photocopying, recording or otherwise, without the prior written
permission of General Motors Corp. This includes all text,
illustrations, tables and charts.
S-881 OF 9-87 Printed in Canada
TABLE OF CONTENTS
SECTION NAME
GENERAL INFORMATION
OA. General lnformation
OB. Maintenance & Lubrication
1 SECT.
HEATING AND AIR CONDITIONING
1A. Heating and Ventilation
1 B. Air Conditioning
1D1. R-4 AIC Com~ressor Overhaul
FRAME AND BUMPERS
2B. Bumpers 2C. Chassis Sheet Metal
STEERING, SUSPENSION, WHEELS
AND TIRES
3. Diagnosis
3A. Wheel Alignment
3B5. Steering Wheels and Columns 3B6. Steering Linkage 3B7. Power Steering Gear and Pump
3C. Front Suspension
3D. Rear Suspension
3E. Tires and Wheels
FINAL DRIVE
4A. Propeller Shaft
4B. Rear Axle
4B1. Bora-Warner Axle
BRAKES 5. Brakes 5A3. Comoosite Master Cvlinder 5B1. Disc r rake Caliper ~ssembly - 300013100 Series 5B6. Disc Brake Caliper Assembly - 3548
Series
5C3. Direct Torque Drum Brake Assembly 5D2. Power Head Assembly - Tandem Diaohraam 5F. ~~ecifications and Special Tools
ENGINE 6. Engine General lnformation 6A2. 2.8L 6A3. 5.OL & 5.7L 6B. Engine Cooling
6C. En~ine Fuel
6D. ~ngine Electrical 6D1. Battery 6D2. Cranking System 6D3. Charging System 6D4. Ignition System 6D5. Engine Wiring
6E. Driveabilitv and Emissions
6E2. ~missions' 6E3. Emissions - PFI
6F. Engine Exhaust
TRANSMISSION 7A. Automatic Transmission - General
lnformation
7A1. Automatic Transmission - On-Car
Service
700R4. Automatic Transmission Hydraulic Diagnosis
700R4. Automatic Transmission Unit Repair
76. 5-Speed Manual Transmission
7C. Clutch
CHASSIS ELECTRICAL 8A. Electrical Diagnosis
8B. Lighting and Horns
8C. Instrument
Panel, Gages
& Console
8E. Windshield Wiper &Washer System
ACCESSORIES 9A. Radio Systems and Antennas 9B. Cruise Control 9G. Miscellaneous Accessories
I BODY SERVICE MANUAL END
OF
MANUAL

OB-4 MAINTENANCE AND LUBRICATION
Tire and wheel operation - Be alert to a vibra-
tion of the steering wheel or seat at normal highway
speeds. This may mean a wheel balance is needed. Also, a
pull right or left on a straight, level road may show the
need for
a tire pressure adjustment or wheel alignment.
Steering system operation - Be alert to
changes in steering action. An inspection is needed when
the steering wheel is harder to turn or has too much free
play or if unusual sounds are noted when turning or
parking.
Headlight aim operation - Take note of light
pattern occasionally. If beam aim doesn't look right,
headlights should be adjusted.
AT EACH FUEL FILL
Engine oil level check - Check engine oil level
and add if necessary. See your Owner's
Manual for further
details.
NOTICE: A large loss in this system may indicate a
problem. Have it inspected and repaired at once.
Engine coolant level and condition - Check
engine coolant level in coolant reservoir tank and add if
necessary. Replace if dirty or rusty. See your Owner's
Manual for further details.
NOTICE: A large loss in this system may indicate a
problem. Have it inspected and repaired at once.
Windshield washer fluid level check -- Check
washer fluid level in container and add if necessary.
Hood latch operation - When opening hood on
cars equipped with hoods that open from the front, note
the operation of secondary latch. It should keep hood from
opening all the way when primary latch is released. Make
sure that hood closes firmly.
AT LEAST MONTI-ILY
Tire and wheel inspection and pressure
check--
Check tires for abnormal wear or damage. Also,
check for damaged wheels. Keep pressures as shown on
Tire Placard on the driver's door (include spare unless it is
a stowaway). Pressure should b\: checked when tires are
"cold". See "Tires" in Owner's Manual for further
infomation.
Light operation check - Check operation of
license plate light, side-marker lights, headlights includ-
ing high beams, parking lights, taillights, brake lights.
turn signals, backup lights, instrument panel and interior
lights and hazard warning flashers.
Fluid leak check - After the car has been parked
for a while, inspect the surface beneath the car for water,
oil, fuel or other fluids. Water dripping from the air
conditioning system after use is normal. If you notice fuel
leaks or fumes, the cause should be found and corrected at
once.
AT LEAST TWICE A YEAR (FOR EXAMPLE,
EVERY SPRING AND FALL)
Power steering pump fluid level check --
Check power steering pump fluid level in accordance with
Owner's Manual instructions and keep at proper level.
NOTICE: A large loss in this system may indicate a
problem. Have it inspected and repaired at once.
Brake master cylinder reservoir fluid level
check ---- Check fluid and keep at proper level. Note: It is
normal for the brake fluid level to go down slightly as the
brake pads wear
- so be sure to keep reservoir filled.
NOTICE: A large loss in this system may indicate a
problem. Have
it inspected and repaired at once.
Clutch system service --- manual transmis-
sionltransaxle --- For cars equipped with hydraulic
clutch system, check the reservoir fluid level and add fluid
as required. All others, check clutch pedal free travel and
adjust as necessary. See your Owner's Manual for further
details.
~
NOTICE: A large loss in this system may indicate a
problem. Have it inspected and repaired at once.
Weatherstrip Lubrication - Clean surface and
then apply a thin film of silicone grease with a clean cloth.
EACH TIME OIL IS CHANGED
Automatic and manual transmissionltrans-
axle fluid level check - Check transmission/transaxle
fluid level and add as required. (Corvette only) if equipped
with manual transmission
- check fluid in the overdrive
unit and add as required.
NOTICE: A large loss in this system may indicate a
problem. Have
it inspected and repaired at once.
Brake systems inspection - For convenience,
the following should be done when wheels are removed
for rotation: Inspect lines and hoses for proper hookup,
binding, leaks, cracks, chafing, etc. Inspect disc brake
pads for wear and rotors for surface condition. Also in-
spect drum brake linings for wear and cracks. Inspect
other brake parts, including drums, wheel cylinders, park-
ing brake, etc. at the same time. Check parking brake
adjustment.
INSPECT BRAKES MORE OFTEN IF DRIVING
HABITS OR CONDITIONS RESULT IN FREQUENT
BRAKING.
Steering, suspension and front drive axle
boot and seal inspection
- Inspect front and rear
suspension and steering system for damaged, loose or
missing parts, signs of wear or lack of lubrication. Inspect
power steering lines and hoses for proper hookup, bind-
ing, leaks, cracks, chafing, etc. (On cars equipped with
manual steering gear, check for seal leakage.) On
front-
wheel-drive cars, clean then inspect drive axle boot seals
for damage, tears or leakage. Replace seals if necessary.
Exhaust system inspection - Inspect complete
system. Inspect body near the exhaust system. Look for
broken, damaged, missing or out-of-position parts as well
as open seams, holes, loose connections or other condi-
tions which could cause a heat buildup in the tloor pan or
could let exhaust fumes seep into the trunk or passenger
compartment.

STEERING, SUSPENSION, f IRES AND WHEELS DIAGNOSIS 3.1
SECVION 3
STEER NG, SUSPENS
WHEELS
AGNOS
CONTENTS
........................................... General Information 3- 1 ............................................ General Diagnosis 3- 1
Power Recirculating Ball .................................. 3-3
................. Steering Linkage ........................ .. 3-3
Power Steering Pump ................... ... ............ 3-4
Steering Column
Lock System
........................... ... ................ 3-4
Column ............................................................ 3-5
........................................ Turn Signal Switch 3-6
Ignition Switch .............................................. 3-7
Key Reminder .............................................. 3-7
Dimmer Switch .................... ... ................ 3-10
Pivot and Switch Assembly ............................ 3-10
Steering Gear and Pump Leaks .......................... 3- 10
Seal Replacement Recommendations ................. 3- 10
Power Steering System Test Procedure .............. 3-12
................ Strut Dampener and Shock Absorber 3- 12
Tires ........................ .. ..................................... 3- 13
Vibrations .......................... .............. .................... 3- 14
.......................... Tapered Roller Bearings .. .... 3- 14
Trim Height .............................................. 3-14
GENERAL INFORMATION Abnormal or Excessive Tire Wear
Since the problems in steering, suspension, tires
and wheels involve several systems, they must all be
considered when diagnosing a complaint. To avoid
e Front-wheel or rear-wheel alignment
using the wrong symptom, always road test the car
o Sagging or broken springs
first. Proceed with the following preliminary checks
Tire out of balance and correct any substandard conditions which are worn strut dampener or shock absorber found. o Hard driving
--
e Tires for wrong pressure and uneven wear
o Joints from the column to the steering gear for
loose connectors or wear
o Front and rear suspension, and the steering gear
or linkage for loose or damaged parts
Out-of-round or out-of-balance tires, bent wheels,
and loose and/or rough wheel bearings
@ Power steering system for leaks. Also check the
power steering fluid level and the pump drive belt
tension
GENERAL DIAGNOSIS
Car Pulls (Leads)
Inspect
Mismatched or uneven tires
Broken or sagging springs
Radial tire lateral force
Front-wheel or rear-wheel alignment
o Steering gear valve off center (unbalanced)
e Front brakes dragging
a Overloaded car
e Not rotating tires
Scuffed Tires
o Toe incorrect
e Excessive speed on turns
o Suspension arm bent or twisted
Wheel Tramp
Inspect
o Blister or bump on tire
o Improper strut dampener or shock absorber
action
Shimmy, Shake or Vibration
inspect
e Tire or wheel out of balance
e Worn wheel bearings
a Worn tie rod ends
o Worn lower ball joints

3-2 STEERING, SUSPENSION, TIRES AND WHEELS DIAGNOSIS
o Excessive wheel runout
e Blister or bump on tire
e Excessive loaded radial runout of tire and wheel
assembly
Hard Steering (Power)
lnspect
e Hydraulic system - Make test with gage J 5176
or J 25323
e Steering gear adjustment
e Bind or catch in steering gear
e Loose steering gear mounting
e Steering gear pressure port check valve (800
series)
Too Much Play In Steering
a lnspect
e Wheel bearings worn
e Loose steering gear mounting
e Joints from column to steering gear loose or worn
e Steering gear adjustment
Poor Returnability (Power)
Inspect
e Lack of lubrication - ball joints and tie rod ends
o Bind in ball joints
o Rind in steering column
e Front-wheel alignment
e Steering gear adjustment
e Sticking valve
o Steering gear adjustment
e Lower coupling binding on steering gear
Abnormal Noise, Front End
lnspect
Lubrication - ball joints and tie rod ends
Damaged suspension components
Worn control arm bushings or tie rod ends
Imose stabilizer shaft
Loose wheel nuts
Loose suspension bolts
Wheel covers
Steering gear adjustment
Worn strut dampener, shock absorbers or
n~ountings
Spring improperly positioned
Wander or Poor Steering Stability
Inspect
o Mismatched or uneven tires
e Lubrication - ball joints and tie rod ends
e Worn strut dampeners or shock absorbers
e Loose stabilizer shaft Broken
or sagging springs
e Steering gear adjustment
e Front-wheel or rear-wheel alignment
Erratic Steering When Braking
lnspect
e Wheel bearings worn
e Broken or sagging springs
e Leaking wheel cylinder or caliper
Warped rotors
e Incorrect or uneven caster
Low Or Uneven Trim Height
e Broken or sagging springs
@ Overloaded car
e Incorrect or weak springs
Ride Too Soft
Inspect
e Worn strut dampeners or shock absorbers
e Incorrect or sagging springs
Ride Too Harsh
lnspect -
e Incorrect strut dampeners or shock absorbers
e Incorrect springs
Body Leans Or Sways In Corners
lnspect
e Loose stabilizer shaft
e Worn strut dampeners, shock absorbers or
mounting
a Broken or sagging springs
e Overloaded car
Suspension Bottoms
lnspect
a Overloaded car
e Worn strut dampeners or shock absorbers
e Incorrect, broken or sagging spring
"Dog" Tracking
lnspect
e Damaged rear suspension arm or worn bushings
e Bent rear axle
e Frame or underbody alignment incorrect

STEERING, SUSPENSION, VIBES AND WHEELS DIAGNOSIS 3-3
Steering Wheel Kick-Back (Power)
Inspect
e Air in system
e Loose steering gear mounting
e Joints from column to steering gear loose or worn
e Tie rod ends loose
Worn or missing check valve
(800 series)
e Wheel bearings worn
e See "Too Much Play In Steering" for other
possible causes.
Steering Wheel Surges Or Jerks (Power)
Inspect
Hydraulic system - Make pressure test with gage
J 5176-D or
J 25323
e Sluggish steering gear valve
Loose pump drive belt
Cupped Tires
Inspect
Front-wheel or rear-wheel alignment
e Strut dampeners or shock absorbers weak
e Wheel bearing worn
e Excessive tire or wheel runout
e Worn ball joint
a Loose steering gear adjustment
POWER RECIRCULATING BALL
SEERING GEAR DIAGNOSIS
Hissing Noise
There is some noise in all power steering systems.
One of the most common is a hissing sound when the
steering wheel is turned and the car is not moving. This
noise will be most evident when turning the wheel
while the brakes are applied. There is no relationship
between this noise and steering performance. Do not
replace the valve unless the "hissing" noise is extremely
objectionable. A replacement valve will also have a
slight noise, and is not always a cure for the condition.
Check that the intermediate shaft joints are not loose.
Rattle or Chucking Noise
Inspect -
Pressure hose grounding out
e Tie rod ends loose
e Steering gear attachment loose
a Loose pitman shaft "over-center" adjustment.
A slight rattle may occur on turns because of
increased clearance off the "high point". This is
normal and clearance must not be reduced below
specified limits to eliminate this slight rattle.
Poor Return of Steering Wheel to Center
Front-wheel alignment
Wheel bearing worn
Tie rod end binding
Ball joint binding
Steering wheel rubbing against turn signal
housing
Steering gear adjustments
Tight or frozen intermediate steering shaft
Sticky or plugged spool valve
Momentary Increase in Effort Whsn Turning
Wheel Fast to Right or Left
Inspect
High internal leakage
Steering Wheel Surges or Jerks When Turning
With
Engine Running Especially During Parking
ln8pe~t
e Insufficient pump pressure
Sticky flow control valve
Excessive Wheel Kickback or Loose Steering
Air in system
Steering gear attachment loose
Tie rod ends loose
Wheel bearings worn
Steering gear flexible coupling loose on shaft or
rubber disc mounting nuts loose
Loose thrust bearing preload adjustment
Excessive "over-center" lash
Worn pressure port check valve
Hard Steering or Lack of Assist
(Especially During Parking)
-
Brakes applied while turning steering wheel
Intermediate shaft damaged or worn
e Sticky flow control valve
Insufficient pump pressure
Excessive internal pump leakage
Excessive internal steering gear leakage
STEERING LINKAGE DIAGNOSIS
Excessive Play or Looseness in Steering Systern
inspect
r, Worn upper ball joints
e Steering gear worm bearings loosely adjusted

STEERING. SUSPENSION. TIRES AND WHEELS DIAGNOSIS 3-5
High Lock Effort
rn lnspect
e Lock cylinder damaged
e Ignition switch damaged
o Rack preload spring broken or deformed
e Burrs on sector, rack, housing, support or
actuator rod coupling
,
e Bent sector shaft
e Damaged rack
e Extreme misalignment of' housing to cover
e Distorted coupling slot in rack
e Bent actuator rod
e Ignition switch mounting bracket bent
e Actuator rod restricted
e Improper shift linkage adjustment
Will Stick In "Start"
rn lnspect
e Actuator rod deformed
e Check items under "High Lock Effort"
Key Cannot Be Removed in "Off-Lock"
rn lnspect
e Ignition switch is not set correctly
e Damaged lock cylinder
e Linkage mis-adjusted
Lock Cylinder Can Be Removed
Inspect
e Lock cylinder retaining screw missing
High Effort In Lock Cylinder Between "Off" and
"Off-Lock"
lnspect
o Distorted rack
Lock Bolt Hits Shaft Lock In "Off" Position and
"Park"
lnspect
e Ignition switch is not set correctly
COLUMN
Noise In Column
Inspect
e Joints from the column to the steering gear 1
e Column not correctly aligned
e Horn contact ring not lubricated
e Lack of grease on bearings
o Loose sight shields
o Lower or upper steering shaft bearing worn or
broken
e Shaft lock snap ring not seated
o Spherical joint not lubricated
High Steering Shaft Effort
e Column assembly misaligned
e Improperly installed or deformed dust seal
e Damaged upper or lower bearing
e Flash on I.D. of shift tube
e Tight intermediate steering shaft universal joint
High Shift Effort (Automatic with Column Shift)
rn lnspect
e Column not aligned correctly in car
e Wave washer with burrs
e Improperly installed dust seal
o Lack of grease on seal or bearing
e Improper screws used for ignition switch
e Burr on upper or lower end of shift tube
e Lower bowl bearing not assembled correctly
Improper Shifting (Automatic with Column
Shift)
rn lnspect
e Sheared shift tube joint or lower shift lever weld
e Improper or loose linkage adjustment
e 1,oose shift lever
e Improper gate plate
Lash In Steering Column
lnspect
e 1.P.-to-column upper and lower bracket
nlounting bolts loose
e Broken weld nuts on jacket
e I.P. upper bracket capsule sheared
e Loose shoes in housing
e Loose tilt head pivot pins
e Loose shoe lock pin in support
e Loose support screws
e Column upper and lower bracket-to-jacket bolts
loose
e Loose lower bracket-to-adapter and bearing
assembly mounting screws
e Loose 1.P.-to-jacket mounting bolts
Housing Scraping On Bowl
rn Inspect
e Bowl bent or not concentric with hub
e Cover and housing end cap not properly installed

STEERING, SUSPENSION, TIRES AND WHEELS DIAGNOSIS 3.13
in doubt about the condition, compare with a
shock known to be good.
Noisy
For struts, follow Steps 1 through 3.
1. Check all mountings for proper torque. A loose
mounting will cause a noise.
2. If all mountings are intact, bounce the car as in
Step
4 (weak) to isolate the suspected unit.
3. If practical, ride with the owner to be sure you
understand the complaint, before proceeding to
next step.
4. If one of the rear shocks is noisy, the rear axle
should be supported at least enough to unload the
shock mounts. Disconnect the lower mounting of
the suspected shock. Quickly push the shock all
the way in, then all the way out.
A hissing noise
is normal.
5. Other objectionable noises may be detected by
stroking. Any sound other
than hissing is
abnormal; replace the shock.
Leaks
1. Fully extend the strut/shocks (wheels
unsupported) to expose the seal cover area for
inspection.
2. Look for
signs of leaks in the seal cover area.
3. A slight trace of fluid is NOT cause for
replacement; the seal permits some seepage to
lubricate the piston rod. There is a built in fluid
reserve to allow for seepage.
4. A leaking strut dampener/shock can easily be
found because there will be fluid around the seal
cover and an excessive amount of fluid on the
strut
dampener/shock. A leaking strut
dampener/shock must be replaced.
BENCH CHECKS
Strut Dampeners and Regular Shock Absorbers
(Standard and Firm Ride)
Regular strut dampenerdrear shocks use a
gas-filled cell in the fluid reservoir. Aeration or
foaming of the fluid is eliminated, as the gas and the
fluid cannot mix.
Proceed with the actual bench check as follows:
1. Clamp the strut dampener/shock UPSIDE
DOWN in the vise. Do not clamp on the reservoir
tube or the mounting threads. If a lag is noticed
when it is stroked, it means the gas-filled cell has
ruptured and replacement is necessary.
2. Pump strut dampener/shock by hand at various
rates of speed and note the resistance.
3. Rebound resistance normally is stronger than
compression resistance by about 2 to 1. However,
the resistance should be smooth and constant for
each stroking rate.
4. Compare with a strut dampener/ shock known to
be good.
5. It is normal to hear a hissing noise. The following
symptoms are abnormal and are reason for
replacement. A.
A skip or lag at reversal near mid-stroke.
B. A seize (except at either extreme end of
travel).
C. A noise (such as a grunt or squeal) after
completing one full stroke in both
directions.
D. A clicking noise at fast reversal.
E. Fluid leakage.
TIRE DIAGNOSIS
Irregular and Premature Wear
Figs. 14 and 15
Irregular and premature tire wear has many
causes. Some of them are: incorrect inflation pressures,
lack of regular rotation, driving habits, or improper
wheel alignment. If wheel alignment is reset due to a
tire wear condition, always reset toe as close to zero
degrees as the specification allows.
1. WEAR INDICATORS I
Fig. 14 Tire Wear Indicator
If the following conditions are noted, rotate the
tires:
@ Front tire wear is different from rear.
Uneven wear exists across the tread of any tire.
e Left and right front tire wear is unequal.
Left and right rear tire wear is unequal.
Check wheel alignment if the following
conditions are noted:
e Left and right front tire wear is unequal.
Wear is uneven across the tread of any front tire.
e Front tire treads have a scuffed appearance with
"feather" edges on one side of the tread ribs or
blocks.
Wear Indicators
Fig. 16
The original equipment tires have built-in tread
wear indicators to show when the tires should be
replaced. These indicators will appear as 12.7 mm
(1/2") wide bands when the tire tread depth becomes
1.6 mm (2/32"). When the indicators appear in 2 or
more grooves at
3 locations, replace the tire.

3-14 STEERING, SUSPENSION, TIRES AND WHEELS DIAGNOSIS
@ HARD CORNERING O UNDER INFLATION LACK OF ROTATION
@ HEAVY ACCELERATION ON DRIVE AXLE EXCESSIVE TOE ON DRIVE AXLE EXCESSIVE TOE ON NON-DRIVE AXLE @ LACK OF ROTATION O LACK. OF ROTAT ION
Fig. 15 Tire Wear Diagnosis
Radial Tire Waddle
Fig. 17
Waddle is side-to-side movement at the front
and/or rear of the car. It can be caused by the steel belt
not being straight within the tire, or by excessive lateral
runout of the tire or wheel. It ig most noticeable at low
speed, about 8 to 48
km/h (5 to 30 mph). It may also
appear as a ride roughness at 80 to 113
km/h (50 to 70
mph). The car can be road tested to see which end of the
car has the faulty tire. If the tire causing the waddle is
on the rear, the rear end of the car will "waddle." From
the driver's seat, it feels as if someone is pushing on the
side of the car.
If the faulty tire is on the front, the waddle is
more easily seen. The front sheet metal appears to be
moving back and forth. It feels as if the driver's seat is
the pivot point in the car.
Another more time-consuming method of
determining the faulty tire is substituting tire and
wheel assemblies that are known to be good. Follow
these steps:
1. Drive the car to determine if the waddle is coming
from the front or rear.
2. Install tire and wheel assemblies known to be
good (from a similar car) in place of those on the
end of the car which is waddling. If the waddle
cannot be isolated to front or rear, start with the
rear tires.
3. Road test again. If improvement is noted, install
the original tire and wheel assemblies one at a
time until the faulty tire is found. If no
improvement is noted, install tires known to be
good in place of all four. Then, install the
originals one at a time until the faulty tire is
found.
Radial Tire Lead/Pull
Fig. 18
"Lead/Pull" is the deviation of the car from a
straight path, on a level road with no pressure
on the
steering wheel.
L Fig. 16 Tire Waddle
Lead is usually caused by:
1. Tire construction.
2. Uneven brake adjustment.
3. Wheel alignment.
The way in which a tire is built can produce lead
in a car. An example of this is placement of the belt.
Off-center belts on radial tires can cause the tire to
develop a side force while rolling straight down the
road. The tire will tend to roll like a cone.
The Radial Tire
Lead/Pull Correction Chart
should be used to make sure that front wheel alignment
is not mistaken for tire lead.
Rear tires will not cause lead.
VIBRATION DIAGNOSIS
See Figs. 19 through 21 for vibration diagnosis.
TAPERED ROLLER BEARING
DlAGNOSlS
See Figs. 22 and 23 for Tapered Roller Bearing
Diagnosis.
See Fig. 24 for Trim Height Diagnosis.