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Page Title: DISTRIBUTOR SHAFT AND BUSHING WEAR TEST
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MAINTENANCE - TM-5-4210-230-14P-1_553
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Operation Test Procedure
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 Fig. 7 1. "O" Ring 2. Gasket DISTRIBUTOR SHAFT AND BUSHING WEAR TEST This  procedure  can  be  used  to  check  condition  of  the distributor shaft and shaft bushings in the distributor housing. 1. Clamp distributor in a vise equipped with soft jaws and apply  only  enough  pressure  to  restrict  movement  of distributor. 2. Remove   distributor   rotor   and   dielectric   shield   (dust cover). 3. Attach   dial   indicator   to   distributor   housing   so   that indicator   plunger   rests   against   top   portion   of   trigger wheel assembly (Figure 8). C20 Fig. 8 Shaft and Bushing Wear Test (Checking Distributor Shaft Side Play) 1.  Spring Scale 2.  Dial Indicator 3.  Wire Loop 4. Place   one   end   of   a   wire   loop   around   top   of   trigger wheel  assembly  (rotor  shaft).    Hook  a  spring  scale  in other end of wire loop and pull on a line with plunger of dial     indicator     (Figure     8).          Wire     loop     must     be perpendicular  to  shaft  to  assure        a  a  straight  pull. Also,    loop    must    not    interfere    with    dial    indicator mounting bracket. 5. Apply  one-half  (½ )  pound  of  pull  on  spring  scale  and read   movement   of   plunger   on   indicator   dial.      Apply one-half  (½ )  pound  of  pull  in  opposite  direction  and again read movement on indicator.  Peak-to-peak side play is the sum of these two readings. If     distributor     shaft     side     play     exceeds     maximum permissible limit (see DISTRIBUTOR TEST SPECIFICATIONS),  replace  distributor  shaft  bushings (see Distributor Housing Bushing Replacement). DISTRIBUTOR OPERATION TEST (On Test Stand) Operation   of   the   distributor   can   be   checked   on   a distributor test stand. It  is  advisable  to  perform  the  distributor  operation  test prior to disassembly of the distributor for service. This test will give valuable information about the condition of the distributor and indicate where parts replacement may be required. Preparation of Distributor Test Stand (Refer to Figure 9) Additional equipment required: Battery, 12 volt (fully charged). Jumper Wires (2) with clips at each end. 1. Mount distributor to be tested in test stand. 2. Clip   test   stand   distributor   lead   to   ring   connector   on brown distributor lead. 3. Clip    test    stand    ground    lead    to    ground    stud    on distributor mounting frame. CGES-145-U  Page 6 PRINTED IN UNITED STATES OF AMERICA

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