Cadillac 60 Series 1963 Shop Manual page 498

BODY
16-29
29. Vacuum Door Lock Trouble
Shooting Procedure
When an air leak in the vacuum lock system is
not severe enough to be heard, the leak-down
testing device shown in Fig. 16-33 will aid in
determining which part is leaking.
out port) to bottom of check valve on storage
tank, Fig. 16-31.
3. Install other hose, with attached port, from
testing device to hose leading to remote control
valve.
4. Set testing device in
%
an uprigkt position.
Key
1.
2.
3.
4.
5.
6.
7.
8
Description
Quart Glass Container
Metal Cap
Cap Sealing Ring
Cap Ports
Cap Port
Hose
Hose
Glass Tube
I.D.
-
-
-
3/16"
3/16"
7/32"
5/32"
1/8"
O.D.
-
-
-
1/4"
1/4"
3/8"
5/16"
5/16" to 3/8"
Length
-
-
-
2-1/2"
2-1/2"
2.0'
1"
4"
Quantity
1
1
1
2
1
2
1
1
NOTE: Water level in testing jar should be
approximately one inch above end of glass tube.
This device can be easily constructed from
common items that are generally available. The
following chart lists the necessary items. Key
numbers refer to Fig. 16-33.
Although most transparent glass containers are
satisfactory for use as a testing device, a quart
jar with metal cap that can be sealed is recom-
mended because it can be easily transported.
Observation from most angles is also possible
when using a quart container. After drilling holes
in metal cap, insert cap ports and solder ports,
Fig. 16-33. The container must not leak air
through cap or cap ports when installed in vacuum
lock system.
The glass tube, Fig. 16-33, should be cut at a
45° angle at lower end, as illustrated. If glass
tubing is not available, plastic or similar trans-
parent tubing may be substituted, provided tubing
has the specified inside diameter.
a. Installation of Testing Device Into
Vacuum System
The testing device is installed between the vac-
uum storage tank and remote control valve. To
install testing device, proceed as follows:
1. Raise hood and remove storage tank-to-
remote control valve attaching hose (red) from
bottom of check valve on storage tank, Fig. 16-31.
2. Install hose from testing device (hose with-
b. Recharging Vacuum Storage Tank
Vacuum will usually have been depleted after
four or five cycles of operation (locked or un-
locked) of the door locks, or after testing device
has been properly installed. To recharge storage
tank to normal vacuum (22-24 inches of mercury),
proceed as follows:
1. Turn testing device on its side until glass
tube is out of water.
2. Start engine and continue running until tank
is fully charged (approximately 30-45 seconds).
3. Turn engine off and return testing device to
normal upright position.
4. Allow 15 to 30 seconds for water in testing
device to stop bubbling.
NOTE: This waiting period is necessary
due to different pressures in the system on
both sides of testing device. Bubbling is the
result of these pressures trying to equalize
themselves. The storage tank may be recharged
as often as required when checking vacuum
system for an air leak.
c. Determining Size of Air Leak From Bubbles
on Testing Device
If bubbles appear in water at a rate of approxi-
mately one every fifteen seconds or faster, an air
leak is present in the remote control valve or
either door lock
0
selector valve. The faster bubbles
appear in the water, the more severe is the air
leak. However, in most cases, where the air leak