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BATTERY - PAGE 6-6
BATTERY GROUND STRAP
A clean tight battery to ground strap is important
for good electrical efficiency, as all current flow to
and from the battery must pass through this conduc-
tor.
The battery ground strap on the 480 and 490 series
is of two pieces, the longer section connects the
battery positive terminal to a ground post at the base
of battery support, effecting a ground connection to
body and frame. A shorter strap leads from the post
at base of battery to the left engine mount bolt, thus
assuring continuous electrical ground of the engine.
To prevent damage to the ground strap terminal at
left engine mount, a plain washer, part number
171096, supersedes the lock washer heretofore used
at this point. Figure 1.
The battery hold down bolt nuts should be drawn
up not tighter than 2 to 3 foot-pounds torque. This
low tension is ample to hold the battery securely, yet
is not liable to result in cracked battery cells on
account of being too tight.
FIGURE 1
GENERATOR - PAGE 6-7
A few of the late 490 series cars were equipped
with a "Shunt Wound" generator and a "Vibrating
Type" current - voltage regulator. These units can be
identified as follows: Generator No. GDZ-6001-B
stamped on the generator name plate. Voltage Regu-
lator No. VRP-6002A stamped on upper face , of
regulator base.
For adjustment and repair procedure refer to your
"500 Series" manual under "Engine Tune-up", Sec-
tion 2 and "Electrical" Section 6.
DISTRIBUTOR - PAGE 6-17
VACUUM AND MECHANICAL ADVANCE
(6 CYLINDER)
General Technical Policies and Information Bul-
letin No. 5 dated January 14, 1949 outlined in detail
a change in vacuum spark advance from 8.5 degrees
to 4 degrees maximum. Although this change be-
came effective with car 491-33913, some of the
distributors have been reworked in the field prior to
this number. When testing a distributor for vacuum
advance always check the number stamped on the
breaker plate as shown in Figure 2. This number
indicates the vacuum advance. Beginning with car
FIGURE 2
21
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