c. Clean the plugs with approved sand blasting method, and then inspect each plug carefully for cracks, chips, or
erosion of the electrodes. Discard those plugs which are not in good condition.
d. Check spark plug air gap with a wire feeler gage. A gap of 0.023 to 0.028-inch must be maintained between the
center and outer electrodes. Adjust gap, if necessary, by carefully bending the outer electrode.
e. Inspect the ignition cables for frayed shielding and damaged insulation. Examine the cable coupling nuts for
cracks or breaks. Make sure the cables are securely mounted. Tighten mounting screws, if necessary. Do not attempt to
repair a defective ignition cable; always install a new cable.
f. Install the spark plugs and reconnect ignition cables.
97. Distributor
a. Removal (fig. 37).
(1) Disconnect the manifold tube assembly (13) from elbow (14) and low tension plug assembly (18) from the
distributor connector.
(2) Disconnect the air cleaner tube (5) from the elbow (34) and the four ignition cables (35, 36, 37, and 41) from
the distributor cap.
(3) Scribe or chalk a line on the bottom flange of the adapter (32) and a corresponding line on the crankcase
cover. This will eliminate the necessity of timing the ignition when the distributor is reinstalled.
(4) Remove the hex nuts (21), lockwashers (22) and clamps (23) and lift the distributor (33) straight up from the
crankcase cover.
b. Installation (fig. 37).
(1) Carefully insert the drive gear end of the distributor down into the opening in the crankcase cover. Be sure
the gasket (27) is in place. Aline the scribe mark on the adapter mounting flange with that on the crankcase
cover, and install the clamps (23), lockwashers (22) and hex nuts (21).
(2) Connect the four ignition cables (35, 36, 37 and 41) to the distributor cap.
(3) Connect the air cleaner tube (5) to the elbow (34), the manifold tube assembly (13) to elbow (14), and the
low tension plug assembly (18) to the distributor connector.
Note
If a new distributor is being installed, the ignition timing must be checked and adjusted (par. 98).
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