GM 96069521 Distributor Asm

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On later models, the manufacturer does not recommend disassembling the distributor. If the distributor is damaged or the shaft is worn, replace the distributor as a unit. Disconnect the cable from the negative terminal of the battery. Remove the distributor. Remove the generator and igniter. Remove the vacuum advance unit. Remove the two screws that retain the generator base plate to the distributor body, and then lift out the plate. Check the plate for smooth rotation-if it's stuck or doesn't turn smoothly, replace it. To remove the distributor drive gear, grind off the ends of the set pin, then knock the pin out with a hammer and punch. The gear should now slide off the shaft. If it's stuck, a small gear puller can be used to remove it. To install the gear, slide it onto the distributor shaft and align the set pin holes. Tap the new pin into place, then peen each end of the pin by hitting it with a hammer and punch while the other end is resting against a solid surface. This will prevent the pin from working its way out during engine operation. Install the generator base plate-the four spring clips around the outer edge of the plate must line up with the four grooves in the distributor housing before the plate will drop down into position. Make sure the pin for the vacuum advance arm is located properly. To reassemble the remainder of the distributor, reverse the disassembly sequence. Don't forget to adjust the signal rotor air gap following the procedure.

Check and adjust the ignition timing as needed.