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SERVICE BULLETINNUMBER ST-33-12/81 |
CATEGORY: TECHNICAL
ATTENTION: ALL DMC DEALERS/SERVICE MANAGERS
SUBJECT: WATER LEAKS - BODY
Water leaks into the interior of the vehicle body may be difficult to
diagnose, and the following main points must be considered when a water
leak occurs.
Does the leak occur with the vehicle in motion or standing
still?
With the vehicle in motion, a water leak in the interior may
be related to a much lower or distant entry point on the
exterior due to the fact that a lower air pressure may exist
in the interior rather than the exterior of the vehicle and
equalized airflow may transport water to distant exit points
in the interior. Splash water from the wheels may have an
outside entry on the underside of the vehicle. Water leaks
that occur with the vehicle standing still usually appear at
a lower point in the interior.
Tilt of Vehicle
Some leaks may occur with the vehicle in a tilted position
causing designed drains to back up especially if large amounts
of water are involved.
High Water Pressure
During washing or windstorms high water pressure may force
water through seals and crevices or cause drains to back up
and overflow.
Drains
Certain vehicle areas have designed drains to direct water to
the outside. For example, drains are found on the bottom of
the doors or around the door openings of the body to allow
water that entered at the window lip seals, which due to their
function cannot provide a full seal, to escape to the outside.
Water entering through the gap of the doors is drained to the
outside. Due to their function, all drains must be free of
obstruction and seals (watertight) from the rest of the body.
Sealing
The joints of the body panels, windows, ducts, and cable
passages are sealed in areas where water entering at these
points would drain to the inside.
Continued...
ST-33-12/81
Water Leaks - Body
Page 2
Owner observations and thorough knowledge of the vehicle sealing and
draining areas will greatly assist in locating a water leak.
The attachment to this bulletin identifies sealed joints of the DMC
vehicle body.
When sealing the indicated joints use Dow Silastic 732 R.T.V or
equivalent.
William A. Charles
Director, Service/Parts
WAC:ak
Attachment
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