Service Ignition System; Cleaning And Inspecting Distributor Cap, Rotor And Coil - Chevrolet CHEVY VAN G10 SERIES Service Manual

• Installation o f plugs to corroded spark plug hole
threads.
8
. C onnect spark plug wiring.
SERVICE IG N IT IO N SYSTEM
1. Remove distributor cap, clean cap and inspect for cracks,
carbon tracks and burned or corroded term inals. Replace
cap where necessary (Fig. 3).
2. Clean ro to r and inspect for damage or deterioration.
Replace ro to r where necessary.
3. Replace brittle, oil soaked or dam aged spark plug wires.
Install all wires to proper spark plug. Proper positioning
o f spark plug wires in supports is im p o rtan t to prevent
cross-firing.
4. Tighten all ignition system connections.
5. Replace or repair any wires th at are frayed, loose or
dam aged.
6
. Check the distributor centrifugal advance m echanism by
turning the distributor ro to r in a clockwise direction as
far as possible, then releasing the ro to r to see if the
springs return it to their retarded position. If the ro to r
does n o t return readily, the d istributor m ust be dis­
assembled and the cause o f the trouble corrected.
7. Check to see th a t the vacuum control operates freely by
turning the movable breaker plate counterclockw ise to
see if the spring returns to its retarded position. Any
stiffness in the operation o f the vacuum control will
ERODED
TOWER
INSPECTION OF DISTRIBUTOR
CAP TOWERS
BURNED OR
ERODED
INSERT
BLOWING OUT INSIDE OF DISTRIBUTOR
CAP & INSPECTION OF INSERT
_________________ TERMINALS__________________
CLEANING & INSPECTION OF
OUTSIDE OF DISTRIBUTOR CAP
ROTOR TIP
INSUFFICIENT
ROTOR CONTACT
SPRING
TENSION
ROTOR INSPECTION
CLEANING IGNITION
COIL
Fig. 3 —Cleaning and Inspecting D istributor Cap, R otor and Coil
affect the ignition timing. C orrect any interference or
binding condition noted.
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. E xam ine distributor points and clean or replace if
necessary.
• C ontact points w ith an overall gray color and only
slight roughness or pitting need n ot be replaced.
• D irty points should be cleaned w ith a clean point
file.
Use only a few strokes o f a clean, fine-cut
contact file. The file should n ot be used on other
m etals and should n ot be allowed to becom e greasy
or dirty. Never use em ery cloth or sandpaper to
clean contact points since particles will em bed and
cause arcing and rapid burning o f points. Do not
attem p t to remove all roughness nor dress the point
surfaces dow n sm ooth. Merely remove scale or dirt.
• Clean cam lobe w ith cleaning solvent and rotate
cam lubricator wick 180° as applicable.
• Replace points th a t are burned or badly pitted.
N O T E : Where prem aturely burned or badly pitted
points are encountered, the ignition system and
engine should be checked to determine the cause o f
trouble so that it can be elim inated. Unless the
condition causing point burning or pitting is cor­
rected, new points will provide no better service
than the old points. Refer to Section 6 Y fo r an
analysis of point burning or pitting.
CLEANING & INSPECTION OF
INSIDE OF DISTRIBUTOR CAP
CLEANING TOWER INSERT
ENG INE 6-3
REPLACING DISTRIBUTOR
CAP
INSPECTION OF CARBON
ROTOR BUTTON
C H E V Y V A N SH O P M A N U A L