Chevrolet 30 Series 1967 Service Manual page 283

Fig. 3— Distributor (In Line)
2. Clean rotor and inspect for damage or deterioration.
Replace rotor where necessary.
Replace brittle, oil soaked or damaged spark plug
3.
wires. Install all wires to proper spark plug. Proper
positioning of spark plug wires in supports is im­
portant to prevent cross-firing.
4. Tighten all ignition system connections.
5. Replace or repair any wires that are frayed, loose
P u l s e (B r e a k e r l e s s ) D i s t r i b u t o r
or damaged.
Magnetic
There are no moving parts in the ignition pulse amp­
lifier, and the distributor shaft and bushings have
permanent type lubrication, therefore no periodic main­
tenance is required for the magnetic pulse ignition
system. Refer to Section
and/or repair procedures encountered on the Transis­
torized (Magnetic Pulse) ignition system.
Standard (Breaker Point) Distributor (Figs. 3 or 4)
1. Check the distributor centrifugal advance mechanism
by turning the distributor rotor in a clockwise direc­
tion as far as possible, then releasing the rotor to
see if the springs return it to their retarded position.
If the rotor does not return readily, the distributor
must be disassembled and the cause of the trouble
corrected.
2. Check to see that the vacuum control operates freely
by turning the movable breaker plate counterclock­
wise to see if the spring returns to its retarded
position. Any stiffness in the operation of the vacu­
um control will affect the ignition timing.
any interference or binding condition noted.
Examine distributor points and clean or replace if
3.
necessary.
• Contact points with an overall gray color and
only slight roughness or pitting need not be
replaced.
• 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
ADJUST DWELL
ANGLE SETTING OR
POINT OPENING
Y for an analysis of problems
6
Correct
(RO U N D )
CENTRIFUGAL
A D V A N C E
M EC H A N ISM
C A M
LUBRICATOR
REPLACEM ENT
A D JU ST SQ UA RELY
A N D JU ST
T O U C H IN G LOBE
O F C A M
Fig. 4— Distributor (T yp ica l V8)
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, lubricate
cam lobe with " Delco Remy Cam and Ball Bearing
Lubricant" or its equivalent and rotate cam lub­
ricator wick turn.
1 / 2
• Replace points that are burned or badly pitted.
NOTE: Where prematurely burned or badly
pitted points are encountered, the ignition sys­
tem and engine should be checked to determine
the cause of trouble so 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.
Section Y for an analysis of point burning or
6
pitting.
• Check point alignment (fig. 5) then, adjust d istri­
butor contact point gap to .019" (new points) or
.016" (used points).
must be on high point of lobe during adjustment.
NOTE: If contact points have been in service,
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
lim its, replace.
ENGINE 6-3
ROTOR
LOCATOR
(SQ U A R E )
C A M
LUBRICATOR
CA U TIO N !
N EVER O IL
C A M LU B R IC A T O R —
REPLACE W IC K
W H E N N EC ESSA R Y
Refer to
Breaker arm rubbing block
CHEVROLET TRUCK SERVICE MANUAL