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OPERATION - TM-5-4210-230-14P-1_552
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DISTRIBUTOR SHAFT AND BUSHING WEAR TEST
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 The  vacuum  advance  system  incorporates  a  vacuum diaphragm  unit  which  rotates  the  distributor  sensor  plate  in response to changes in carburetor throttle bore vacuum. The  two  systems,  mechanical  and  vacuum  (Figure  5) operate  independently,  yet  work  together  to  provide  proper spark advance. Fig. 5 Spark Advance Systems 1. Mechanical (Centrifugal) Advance Mechanism 2. Vacuum Advance Diaphragm Unit MAINTENANCE To   perform   effectively,   the   ignition   system   must   be properly   maintained.   It   is   important   that   ignition   system maintenance operations be performed at the specified time or mileage intervals. For  ignition  system  maintenance  intervals,  procedures and specifications, refer to the appropriate "Emission Control Systems and Service Operations" section of the Truck Service Manual as listed below. For vehicles built in 1978, see CTS-2733 For vehicles built in 1979, see CGES-135 For vehicles built in 1980, see CGES-215 For vehicles built in 1981, see CGES-300 DISTRIBUTOR SERVICE DISTRIBUTOR REMOVAL 1. Unfasten    distributor    cap    retaining    clips.        Remove distributor cap (with high tension cables) and position it out of the way. 2. Disconnect    vacuum    hose    from    distributor    vacuum advance unit, if equipped. 3. Disconnect distributor wiring as follows: a. Disconnect     distributor     leads     from     positive     and negative terminals of.  ignition coil. b. Disconnect     deceleration     throttle     modulator     lead (white wire) at connector (where used). 4. Disconnect tachometer drive cable, if equipped. 5. Scribe a mark on distributor housing in line with tip of rotor    (Figure    6)    and    note    position    of    rotor    and distributor   housing   in   relation   to   surrounding   engine parts as reference points for reinstalling distributor. Fig. 6 Rotor Position Reference Mark 1. Scribe Mark 6. Remove distributor hold-down bolt and clamp. 7. Carefully withdraw distributor from engine.  Do not lose gasket   or   "O"   See   Figure   7   for   gasket   or   "O"   ring location on distributor. CGES-145-U  Page 5 PRINTED IN UNITED STATES OF AMERICA

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