Service Battery And Battery Cables; Point Alignment - Chevrolet 10 1971 Series Chassis Service Manual

ENGINE 6-4
LOCATOR
(ROUND)
CENTRIFUGAL
ADVANCE
M ECHANISM
CAM
LUBRICATOR
REPLACEMENT
ADJUST SQUARELY
AND JUST
TOUCHING LOBE
OF CAM
Fig. 5 — Distributor (V8)
> Dirty points should be cleaned with a clean point
file.
Use only a few strokes of a clean, fine-cut con­
tact file. The file should not be used on other
metals and should not be allowed to become greasy
or dirty. Never use emery cloth or sandpaper to
clean contact points since particles will embed and
cause arcing and rapid burning of points. Do not
attempt to remove all roughness nor dress the
point surfaces down smooth. Merely remove scale
or dirt.
► Clean cam lobe with cleaning solvent and rotate
cam lubricator wick end for end (or 180° as
applicable).
» Replace points that are burned or badly pitted.
Where prematurely burned or badly
NOTE:
pitted points are encountered, the ignition sys­
LATERAL
MISALIGNM ENT
CORRECT LATERAL MISALIGNMENT BY
L -| BENDING FIXED CONTACT SUPPORT
NEVER BEND BREAKER LEVER
Fig. 6 — Point Alignm ent
ROTOR
LOCATOR
(SQUARE)
CAM
LUBRICATOR
CAUTION!
NEVER OIL
CAM LUBRICATOR—
REPLACE WICK
WHEN NECESSARY
PROPER
LA T ERA L ALIGNMENT
■' 1
t i ­
. 1 1
l l *
J l l
l l "
tem and engine should be checked to determine
the cause of trouble so that it can be eliminated.
Unless the condition causing point burning or
pitting is corrected, new points will provide no
better service than the old points. Refer to
Section 6Y for an analysis of point burning or
pitting.
• Check point alignment (fig. 6) then, adjust distri­
butor contact point gap to .019" (new points) or
.016" (used points). Breaker arm rubbing block
must be on high point of lobe during adjustment.
If contact points have been in service,
NOTE:
they should be cleaned with a point file before
adjusting with a feeler gauge.
• Check distributor point spring tension (contact
point pressure) with a spring gauge hooked to
breaker lever at the contact and pull exerted at 90
degrees to the breaker lever. The points should be
closed (cam follower between lobes) and the read­
ing taken just as the points separate. If not within
limits, replace.
Excessive point pressure will cause excessive
wear on the points, cam and rubbing block. Weak
point pressure permits bouncing or clattering,
resulting in arcing and burning of the points and
an ignition miss at high speed.
4. Install rotor and distributor cap. Press all wires
firmly into cap towers.

Service Battery and Battery Cables

1. Measure the specific gravity of the electrolyte in
each cell (fig. 7). If it is below 1.230 (corrected to
80°F.) recharge with a slow rate charger, or if
desired, further check battery.
2. Connect a voltmeter across the battery terminals
and measure the terminal voltage of the battery
during cranking (disconnect the coil primary lead
at the negative terminal during this check to prevent
engine from firing). If the terminal voltage is less
than 9.0 volts at room temperature, approximately
80° ± 20°F., the battery should be further checked.
See Section 6Y for further tests.
D O NO T SUCK
IN TO O MUCH
ELECTROLYTE
FLOAT MUST
BE FREE
Fig. 7— Testing Specific G ra vity of Battery
HOLD
VERTICAL
TAKE READING
AT EYE LEVEL
10-30 CHEVROLET TRUCK SERVICE MANUAL