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GENERALINFORMATIONAND
MAlNTENANdE 1-25
osen the distributor cap retain-
Fig. 106. . . then remove the cap from the
distributor
Fig. 107 Grasp the rotor and pull it straight
off of the distributor shaft
REMOVAL &INSTALLATION
1. Disconnect the negative battery cable.
*Depending on the reason for removing the
distributor cap, it may make more sense to
Fig. 108 The rotor must be aligned correctly
to the distributor shaft before installation
other physical damage. Make sure the distributor
cap's center button is free of damage. Check the cap
terminals for dirt or corrosion. Always check the rotor
blade and spring closely for damage. Replace any
comoonents where damaae is found.
smmE
ALGNME
LOCATOR
b See Figures 105,106,107, and 108
GENERAL INFORMATION
b See Figures 111 and 112
Ignition timing is the measurement,
in degrees of
crankshaft rotation, of the point at which the spark
plugs fire in each of the cylinders. It is measured in
degrees before or after Top Dead Center (TDC) of the
compression stroke.
Ideally, the air/fuel mixture in the cylinder will be
ignited by the spark plug just as the piston passes
I
1
COMBUSTION
ENDS 23' ATDC
SPEED INCREASES
9ir&1$?6
Fig. 111 Advancing the ignition timing
'
CCURS
COMBUSTION
DC
ENDS 23 ATDC
3. Remove the distributor cap retaining screws or
clips and remove the cap from the distributor.
4. Note its installed position, then remove the ro-
tor from the distributor shaft.
leave the spark plug wires attached. This is
handy if you are testing spark plug wires, or
if removal is necessary to access other com-
ponents, and wire length allows you to repo-
sition the cap out of the way.
2. Label and disconnect the spark plug wires
from the distributor cao.
5. The installation is the reverse of the removal.
INSPECTION
u See Figures 109 and 110
9mg27
After removing the distributor cap and rotor, clean
the components (both inside and outside of the cap)
using soap and water. If compressed air is available,
carefully dry the components (wearing safety gog-
gles) or allow the parts to air dry. You can dry them
with a clean, soft cloth, but don't leave any lint or
moisture behind.
Once the cap and rotor have been thoroughly
Inspection points for the dis
Fig. 112 Retarding the tgnttion timing
cleaned, check for cracks, carbon tracks, burns or
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