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10-1 02 INSTRUMENTS
ELECTRICAL SYSTEMS
(378)
for repairs by an authorized AC Speedometer
service station. If test cable turns freely, the
head is okay; look for sharp bends in cable cas-
ing. A casing radius of not less than 5" must
be maintained at all bends.
b. Inspection and Lubrication of
Speedometer Cable
If the speedometer cable is noisy, or the
speedometer pointer wavers, the cable should
be inspected for kinks or lack of lubrication.
The AC speedometer cable is factory lubri-
cated with a
special
high-low temperature
grease which will last the lifetime of car under
normal operating
conditions.
In extremely hot
and dusty climates, relubrication of the cable
may be necessary at intervals of approximately
20,000 miles or two years of service. When a
cable is replaced, the cable must be
lubricated.
1. Disconnect speedometer cable casing- at
the speedometer head, then pull cable out of
upper end of casing.
2.
Inspect cable for breaks or worn spots and
kinks which indicate lack of lubrication or
sharp bends in casing. To check cables for
kinks, hold one end vertically in each hand and
slowly turn the cable; if cable is kinked the
loop will "flop". Replace cable if kinked, and
also the casing if it is distorted or broken.
3. Spread a thin layer of special high-low
temperature grease, AC Spark Plug type ST-
640, over the lower two-thirds of the cable. As
cable is inserted into casing from upper end the
lubricant will be spread over its entire length.
Do not ouerqrease.
4. Connect
casing to
speedometer
head,
making sure that cable tip seats properly in
the speedometer socket.
c. Replacement of Speedometer Cable
Replacement cables are furnished in a kit,
under Group 4.342, consisting of a cable, cable
C.
STAKE IN VICE-OR---
D.
STAKE WITH HAMMER
Figure 10
-132-lnstallation
of Speedometer Cable Tip
tip, and staking tool. The cable must be cut to
required length and the tip must be installed,
as follows
:
Cutting
Overall Length,
Year
Series
Lenath.
Tip Installed
1948
40 & 70
66%"
67%"
1948-49
50
64"
64%"
1949
70
68"
68%"
1. After cutting cable to specified length, fit
the correct shape new tip to the cut end of
cable, then insert cable and tip between the
jaws of staking tool. See figure 10-132, views
A and
B.
2. Squeeze staking tool edgewise in a vise, or
strike the upper edge of staking tool one or two
sharp blows with a hammer. See figure 10-132,
view C or D. Either method will fasten tip and
cable together permanently.
3. Check overall length, which must be as
specified
above.
4. Lubricate cable and install it (subpar. b,
above) .
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