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Fig.  52  Low Temperature Vacuum Control Valve and Connecting Hose Test
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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EGR VALVE APPLICATION CHART For 1980 U.S.A.  Model Engines
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 b. Be    sure    hoses    are    connected    properly    to    low temperature vacuum control valve. c. If hoses are satisfactory and vacuum does not pass through low temperature vacuum control valve, valve is faulty and must be replaced. After   correcting   any   problem   and   obtaining   a   vacuum signal at EGR valve, repeat System Operation Test per c and d above. Check operation of EGR valve as follows: a. Remove EGR valve from engine. b. Visually   inspect   valve   for   evidence   of   valve   pintle (plunger) not seating.  If pintle does not seat due to deposits, clean valve pintle and seat (see EGR Valve Cleaning Procedure).  If pintle does not seat properly after cleaning, replace EGR valve. c. Apply 10-12" Hg vacuum to EGR valve vacuum port (Fig.  51).  As vacuum is applied, valve pintle should move off seat and retract into valve housing until end of pintle is approximately flush with surface of valve housing.  If valve does not operate when vacuum is applied, valve is faulty and should be replaced. 15A. Replace EGR Valve 15A. Replace EGR Valve Because  EGR  valve  metering  varies  between  engines,  it is  important  that  the  correct  EGR  valve  be  used  in  order  to obtain   optimum   engine   performance   and   emission   control (see EGR Valve Application Chart). To  assist  in  identification,  EGR  valves  are  coded  by  a colored disk attached to the center of the vacuum diaphragm housing.          The     valve     may     also     be     identified     by     the manufacturer's part number stamped on the valve (Fig.  54). 15B. Exhaust Gas Recirculation System Operation. The exhaust gas recirculation (EGR) system introduces a metered   amount   of   exhaust   gas   into   the   intake   manifold where     it     mixes     with     the     air/fuel     mixture     entering     the combustion  chambers.    Dilution  of  the  air/fuel  mixture  with exhaust   gas   lowers   combustion   temperature   and   pressure, thereby reducing formation of oxides of nitrogen. Fig. 54  EGR Valve Identification Marking Fig.  55  Exhaust Gas Recirculation System (Single Diaphragm EGR Valve) The   EGR   valve   regulates   the   amount   of   exhaust   gas entering the intake manifold.  The EGR valve is controlled by ported    vacuum,    which    is    determined    by    position    of    the carburetor   throttle   plate(s).      Operation   of   the   exhaust   gas circulation system is illustrated in Figures 55 and 56. While  the  engine  is  stopped  or  operating  at  idle  speed (negligible  port  vacuum),  the  EGR  valve  is  held  closed  by spring pressure. CGES-215  Page 30 PRINTED IN UNITED STATES OF AMERICA

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