Static Test - Jeep J-10 Series 1982 Technical & Service Manual

Ultrasonic Diagnosis and Repair
(1) Make sure suspect areas are thoroughly dry. If
an opening or hole is full of water, ultrasonic sound will
be blocked.
(2) Remove spare tire.
(3) Remove cargo mat and/or carpet and sound in
sulation material, if equipped.
(4) Remove rear trim panels in suspect area.
(5) Close all windows, doors and air vents.
(6) Using Listener Tool J-23455-01, perform ultra
sonic test as follows:
(a) Place transmitter in cargo compartment,
near suspect area, and turn switch on.
(b) Slowly pass listener around all suspect
joints/seams.
(c) Mark any area reading approximately 5 on
the meter as a indication of a possible leak.
(7) Clean suspect area as described above under
Bonding Surface Preparation.
(8) Straighten any distorted panels.
(9) Seal small suspect joints or seams using 3M AU-
Around Autobody Sealant, or equivalent
(10) Seal large suspect joints or seams using 3M Un-
derseal Rubberized Undercoating, or equivalent.
WATER LEAK/WIND NOISE DIAGNOSIS AND REPAIR 3A-9
(11) Examine suspect area for loose or missing body
plugs.
(a) Check for hardened sealer or road dirt pre
venting plug from seating.
(b) Check plug hole to be sure that it is not
distorted.
(c) If necessary, reshape floorpan or extension
panels and add a bead of 3M AU-Around Autobody Seal
ant, or equivalent, around hole to ensure a satisfactory
water tight seal.
(12) Replace damaged or distorted lamp housing gas
kets and/or seals. Also, tighten lamp housing attaching
hardware.
(13) Seal coach seams with 3M AU-Around Autobody
Sealant, or equivalent, and touch up with matching body
color after sealant has dried.
(14) Tighten fuel tank filler neck screws and seal any
holes or breaks in gasket and/or sealer with 3M AU-
Around Autobody Sealant, or equivalent. Touch up area
with appropriate color coat after sealer has dried.
(15) Repeat ultrasonic test to ensure that an effec
tive repair has been made.
(16) Install previously removed rear trim panels.
(17) Install sound insulation material, if removed,
and cargo mat and/or carpet.
(18) Install spare tire.
INTERIOR WIND NOISES
Page
Door Adjustments 3A-10
General 3A-9
Uftgate-Tallgate Adjustments 3A-10
GENERAL
A systematic diagnosis is necessary to isolate interior
wind noises. The spot where the noise is heard may not
be where the trouble really originates. Before pro
ceeding with a noise diagnosis, consider the forces that
act on the vehicle to generate wind noise.
Air impacts the windshield and is forced around the
A-pillar and along the sides of the vehicle. This air
motion causes a low pressure area that moves along
with the vehicle near the A-pillar and along the sides of
the body.
At the same time, air rammed into the vehicle interior
by forward motion enters through the ventilating sys
tem, if open, to build a positive pressure inside the
vehicle which tends to force the window glass outward.
To maintain a weather-tight, noise-free seal against
these two forces, the doors and glass must be properly
maintained and adjusted.
STATIC TEST
Before beginning a static test, visually inspect the fit
of the doors, liftgates, tailgates and glass. Proper door,
Page
Road Test 3A-10
Static Test 3A-9
Window Adjustments 3A-10
liftgate, tailgate and glass adjustments will cure most
interior wind noise problems. Also, thoroughly inspect
all weatherstrips to make sure they are not damaged or
incorrectly installed. Correct improperly installed, mis-
routed or faulty weatherstrips.
Close all the doors, windows, and vents and turn the
blower motor on high. Use a stethoscope to listen for air
leakage in the suspected area. If the air leakage appears
to be excessive compared with the other side of the
vehicle, perform the necessary repairs to correct the air
leakage and recheck the repaired area.
Another way to static test the vehicle is to use the
Listener Tool J-23455-01. This tool makes use of ultra
sonic energy (high frequency sound) which has certain
properties that are similar to those of fluids (liquids and
gases). Ultrasonic energy does not penetrate solids, such
as glass or metal. It is, however, transmitted through
cracks and openings, such as those that cause water or
air leaks.
An operating ultrasonic generator placed inside ve
hicle body will fill the vehicle with sound energy. This
energy will leak at the same location that permits water