Ford Falcon. Manual — part 14

100-04-28

Noise, Vibration and Harshness

100-04-28

DIAGNOSIS AND TESTING (Continued)

Condition

Source

Action

CHECK for leaks in the system.

Aerated fluid.

PURGE the air from the system.
REFER to Section 211-00 .

INSPECT the isolators for wear or

Steering gear isolators.

damage. REPAIR as necessary.

CHECK the fluid level. REFILL as

Low fluid.

necessary.

Power steering pump brackets loose

CHECK bolts, brackets and bracket

alignment. TIGHTEN bolts to

or misaligned.

specification. REPAIR or INSTALL
new brackets as necessary. REFER to
Section 211-02.

Steering gear clunk — occurs only

INSPECT the steering gear for loose

Steering gear.

while cornering over a bump (can be

mounting bolts. TIGHTEN as

temperature sensitive)

necessary. REFER to Section 211-02 .

Feedback (rattle, chuckle or knocking

Column intermediate/flexible shaft

INSTALL a new intermediate/flexible

noise in the steering gear) — a

joints damaged or worn.

shaft. REFER to Section 211-04 .

condition where roughness is felt in the
steering wheel when the vehicle is
driven over rough surfaces

TIGHTEN the nuts to specification or

Loose, damaged or worn tie-rod ends.

INSTALL new tie-rod ends as
necessary. REFER to Section 211-03 .

Steering gear insulators or mounting

TIGHTEN the bolts or INSTALL new

bolts as necessary. REFER to Section

bolts loose or damaged.

211-02 .

Steering column intermediate shaft

TIGHTEN the bolts to specification.

bolts are loose.

REPAIR or INSTALL a new steering

Steering column damaged or worn.

column as necessary. REFER to
Section 211-04 .

Loose suspension bushings, bolts or

INSPECT the suspension system.

TIGHTEN or INSTALL new

ball joints.

components as necessary. REFER to
Section 204-01 for front suspension or
Section 204-02 for rear suspension.

Feedback (nibble at the steering

Lateral runout in the tyre or wheel.

GO to Pinpoint Test G.

wheel) — a condition where slight
rotational movement is felt in the
steering wheel when the vehicle is
driven over rough or grooved surfaces

Accessory drive belt

ADJUST or INSTALL a new accessory

Loose or worn accessory drive belt.

squeal/chirp—when rotating the

belt as necessary. REFER to Section

steering wheel from stop to stop

303-05 .

Steering column intermediate/flexible

REPAIR or INSTALL a new

Power steering gear hiss

shaft-to-steering gear is binding or

intermediate/flexible shaft as

misaligned.

necessary. REFER to Section 211-04 .

Grounded or loose steering column

REPAIR as necessary.

boot at the dash panel.

Damaged or worn steering gear input

REPAIR or INSTALL a new steering

gear as necessary. REFER to Section

shaft and valve.

211-02 .

Steering column rattle

Loose bolts or attaching brackets.

TIGHTEN the bolts to specifications.

Loose, worn or insufficiently lubricated

LUBRICATE or INSTALL new steering

column bearings as necessary.

column bearings.

REFER to Section 211-04 .

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100-04-29

Noise, Vibration and Harshness

100-04-29

DIAGNOSIS AND TESTING (Continued)

Condition

Source

Action

Steering shaft insulators damaged or

INSTALL new insulators. REFER to

worn.

Section 211-04 .

Intermediate/flexible shaft compressed

INSTALL a new intermediate/flexible

or extended.

shaft. REFER to Section 211-04 .

Insufficiently lubricated steering shaft

LUBRICATE the steering shaft and

Steering column squeak or cracks

bushings.

shaft tube seals.

Loose or misaligned steering column

TIGHTEN or ALIGN the steering

shrouds.

column shrouds.

Steering wheel rubbing against

REPOSITION the steering column

steering column shrouds.

shrouds.

Insufficient lubricated speed control

LUBRICATE the speed control slip

slip ring.

ring.

Upper or lower bearing sleeve out of

REPOSITION the bearing sleeves.

position.

Incorrect assembly of components.

REPAIR or INSTALL a new power

Power steering pump noisy

Imperfections on the outside diameter

steering pump as necessary. REFER

or end surface of the power steering

to Section 211-02 .

pump rotor.
Damaged or worn power steering
pump rotor splines.
A crack on the inner surface of the
power steering pump cam.
Interference between the power
steering pump rotor and cam.
Damaged or worn power steering
pump rotor and pressure plates.

Power steering fluid flow into the

Power steering pump swish noise

Acceptable condition.

bypass valve of the pump valve
housing with fluid temperature below
54

°C (130°F).

PURGE the air from the system.

Power steering pump whine noise

Aerated fluid.

REFER to Section 211-00 . CHECK for
a leak in the system.

REPAIR or INSTALL a new power

Damaged power steering pump.

steering pump as necessary. REFER
to Section 211-02 .

REPAIR or INSTALL a new power

Damaged valve cover O-ring seal.

steering pump as necessary. REFER
to Section 211-02 .

Power steering pump clicking

Power steering pump rotor slippers too

REPAIR or INSTALL a new power

long, excessive rotor slipper-to-slot

steering pump as necessary. REFER

(mechanical) noise

clearance or damaged or worn rotor

to Section 211-02 .

assembly.

Damaged corners on the outside

REPAIR or INSTALL a new power

Power steering pump clatter noise

diameter or the power steering rotor or

steering pump as necessary. REFER

distorted rotor slipper ring.

to Section 211-02 .

Symptom Chart—Suspension Noise/Vibration

Condition

Source

Action

Squeak or grunt—noise from the front

Under these conditions, the noise is

Front stabilizer bar insulators.

suspension, occurs more in cold

acceptable. CHECK TSBs.

ambient temperatures—more
noticeable over rough roads or when
turning

Clunk—noise from the front

INSPECT for loose nuts or bolts.

Loose front struts or shocks.

TIGHTEN to specifications. REFER to

suspension, occurs in and out of turns

Section 204-01 .

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100-04-30

Noise, Vibration and Harshness

100-04-30

DIAGNOSIS AND TESTING (Continued)

Condition

Source

Action

Clunk—noise from the rear

INSPECT for loose or damaged rear

Loose rear suspension components.

suspension, occurs when shifting from

suspension components. REPAIR or
INSTALL new components as

reverse to drive

necessary. REFER to Section 204-02 .

Click or pop—noise from the front

CARRY OUT a ball joint inspection.

Worn or damaged ball joints.

suspension—more noticeable over

INSTALL new control arm as

rough roads or over bumps

necessary. REFER to Section 204-01 .

Front suspension noise—a squeak,

Steering components.

Go to PinPoint Test G .

creak or rattle noise—occurs mostly

Loose or bent front struts or shock
absorbers.

over bumps or rough roads

Damaged spring or spring mounts.
Damaged or worn control/radius arm
bushings.
Worn or damaged stabilizer bar
bushings or links.

Rear suspension noise—a squeak,

Loose or bent rear shock absorbers.

Go to PinPoint Test H .

creak or rattle noise—occurs mostly

Damaged spring or spring mounts.
Damaged or worn control arm

over bumps or rough roads

bushings.

Shudder—occurs during acceleration

Rear drive axle assembly

CHECK the axle mounts and the rear

suspension for damage or wear.

from a slow speed or stop

mispositioned.

REPAIR as necessary.

Incorrect or high CV joint operating

CHECK vehicle ride height is within

angle.

limits. REPAIR as necessary.

Damaged or worn front suspension

CHECK for a loose stabilizer bar,

damaged or loose strut/strut bushings

components.

or loose or worn ball joints. INSPECT
the steering linkage for wear or
damage. REPAIR or INSTALL new
components as necessary.

Shimmy—most noticeable on

CHECK the caster alignment angle.

Excessive positive caster.

coast/deceleration—also hard steering

CORRECT as necessary. REFER to

condition

Section 204-00 .

Symptom Chart—Tyre Noise/Vibration

Condition

Source

Action

Tyre noise—hum/moan at constant

SPIN the tyre and CHECK for tyre

Abnormal wear patterns.

wear. INSTALL a new tyre as

speeds

necessary. INSPECT for
damaged/worn suspension
components. CARRY OUT wheel
alignment.

Tyre noise—noise tone lowers as the

BALANCE the tyre and road test.

Out-of-balance tyre.

INSTALL a new tyre as necessary.

vehicle speed is lowered

REFER to Section 204-04 .

Tyre noise — ticking noise, changes

INSPECT the tyre. REPAIR as

Nail puncture or stone in tyre tread.

with speed

necessary.

Wheel and tyre—vibration and noise

Damaged or worn tyre.

Go to PinPoint Test I .

concern is directly related to vehicle
speed and is not affected by
acceleration, coasting or decelerating

Tyre wobble or shudder — occurs at

SPIN the tyre and CHECK for

Damaged wheel bearings.

abnormal wheel bearing play or

lower speeds

roughness. ADJUST or INSTALL new
wheel bearings as necessary. REFER
to Section 204-01 for front bearings or
Section 204-02 for rear bearings.

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100-04-31

Noise, Vibration and Harshness

100-04-31

DIAGNOSIS AND TESTING (Continued)

Condition

Source

Action

INSPECT the wheel for damage.

Damaged wheel.

INSTALL a new wheel as necessary.
REFER to Section 204-04 .

Damaged or worn suspension

INSPECT the suspension components

for wear or damage. REPAIR as

components.

necessary.

CHECK the wheel nuts. TIGHTEN to

Loose wheel nuts.

specification. REFER to Section
204-04 .

SPIN the tyre and CHECK for

Damaged or uneven tyre wear.

abnormal tyre wear or damage.
INSTALL a new tyre as necessary.
REFER to Section 204-04 .

Tyre shimmy or shake— occurs at

Wheel/tyre out of balance.

BALANCE the wheel/tyre assembly.

lower speeds

CHECK for abnormal tyre wear.

Uneven tyre wear.

INSTALL a new tyre as necessary.
REFER to Section 204-04 .

Excessive radial runout of wheel or

CARRY OUT a radial runout test of the

wheel and tyre. INSTALL a new tyre

tyre.

as necessary. REFER to Section
204-04 .

Worn or damaged wheel studs or

INSPECT the wheel studs and wheels.

INSTALL new components as

elongated stud holes.

necessary.

Excessive lateral runout of the wheel

CARRY OUT a lateral runout test of

the wheel and tyre. CHECK the wheel,

or tyre.

tyre and hub. REPAIR or INSTALL
new components as necessary.

Foreign material between the brake

CLEAN the mounting surfaces of the

brake disc and hub. CHECK the brake

disc and hub or in the brake disc fins.

disc fins for material.

High speed shake or shimmy—occurs

Excessive wheel hub runout.

Go to PinPoint Test J .

Damaged or worn tyres.

at high speeds

Damaged or worn wheel bearings.
Worn or damaged suspension or
steering linkage components.
Brake disc or drum imbalance.

Symptom Chart—Transmission (Manual) Vibration

Condition

Source

Action

Clutch rattling noise—occurs with

Flywheel bolts, clutch housing bolts or

TIGHTEN the bolts to specifications.

clutch engaged, noise

clutch pressure plate bolts loose.

CHECK the bolts for damage.

changes/disappears with clutch pedal
depressed

Clutch squeaking noise—noise is

INSTALL a new pilot bearing. REFER

Pilot bearing seized or damaged.

heard when the clutch is

to Section 308-01 .

operated—vehicle moves slowly or
creeps when the clutch is
disengaged—can also be difficult to
shift into first and reverse gear

Clutch squeaking noise—occurs with

INSPECT the clutch pedal for wear or

Worn clutch pedal shaft or bushings.

damage. REPAIR as necessary.

clutch pedal depressed/released

REFER to Section 308-02 .

Clutch whirring/rattle noise—occurs

Worn, damaged or misaligned clutch

INSTALL a new clutch release

when clutch pedal is depressed

release bearing.

bearing. REFER to Section 308-02 .

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