100-04-38 Noise, Vibration and Harshness 100-04-38
DIAGNOSIS AND TESTING (CONTINUED)
E859 EN 02/2001 2002 Bantam
• Clunk may be a metallic noise heard when
the automatic transaxle is engaged in
REVERSE or DRIVE, or it may occur when
throttle is applied or released. It is caused by
backlash somewhere in the driveline.
• Bearing rumble sounds like marbles being
tumbled. This condition is usually caused by a
malfunctioning wheel bearing.
Noise Conditions
• Gear noise is typically a howling or whining
due to gear damage or incorrect bearing
preload. It can occur at various speeds and
driving conditions, or it can be continuous.
• Chuckle is a particular rattling noise that
sounds like a stick against the spokes of a
spinning bicycle wheel. It occurs while
decelerating from 64 km/h (40 mph) and can
usually be heard all the way to a stop. The
frequency varies with vehicle speed.
• Knock is very similar to chuckle, through it
may be louder and occurs on acceleration or
deceleration. The teardown will disclose what
has to be corrected.
Check and rule out tires, exhaust and trim items
before disassembling the transaxle to diagnose
and correct gear noise.
The noises described under Road Test usually
have specific causes that can be diagnosed by
observation as the unit is disassembled. The
initial clues are the type of noise heard on the
road test and the driving conditions.
Vibration Conditions
NOTE: Constant velocity joints (CV) should not
be changed for new ones unless disassembly
and inspection revealed unusual wear.
Clicking, popping or grinding noises may be
caused by the following:
• Cut or damaged front wheel halfshaft joint
boots resulting in inadequate or contaminated
lube in the outboard or inboard CV joint stub
shaft pilot bearing housings.
• Loose front wheel halfshaft joint boot clamps.
• Another component contacting halfshaft
assembly.
• Worn, damaged or incorrectly installed wheel
bearing, suspension or brake component.
Vibration at highway speeds may be caused by
the following:
• Out-of-balance front or rear wheels.
• Out-of-round tires.
NOTE: Halfshafts are not balanced and do not
contribute to rotational vibration disturbances.
Shudder or vibration during acceleration may be
caused by the following:
• Excessively worn or damaged outboard or
inboard CV joint stub shaft pilot bearing
housing.
• Excessively high CV joint operating angles
caused by incorrect ride height. Check ride
height, verify correct spring rate and check
items under Inoperative Conditions.
Leakage Conditions
1. Inspect CV joint boots for evidence of cracks,
tears or splits.
2. Inspect underbody for any indication of
grease splatter in the vicinity of front wheel
halfshaft joint boot, outboard and inboard CV
joint stub shaft pilot bearing housing
locations, which is an indication of front
wheel halfshaft joint boot and/or front wheel
halfshaft joint boot clamp damage.
3. Inspect inboard CV joint stub shaft pilot
bearing housing seal leakage at inboard CV
joint stub shaft pilot bearing housing.
4. Make sure the front axle wheel hub retainer
is the correct prevailing torque type.
Inoperative Conditions
If a CV joint or halfshaft pullout occurs, check the
following:
• Suspension components for correct location,
damage or wear.
• Bushings for wear
• Sub-frame for damage
• Bent or worn components:
- stabilizer bar link
- left-hand front suspension lower arm and
bushing
- right-hand front suspension lower arm and
bushing
- front wheel hub and spindle
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