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Fig.  50  Cleaning EGRH Valve
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Replace EGR Valve
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 If   minimum   speed   drop   specification   is   not   achieved, verify applied vacuum signal acts on valve. a. Tee vacuum gauge into vacuum hose at EGR valve (upper port on dual diaphragm valves). b. With engine shut off and normal operating temperature  (EGR  low  temperature  vacuum  control valve), any vacuum magnitude applied at carburetor end  of  vacuum  hose  should  be  observed  at  EGR valve end of hose (Fig.  52). c. If   same   vacuum   is   not   observed,   inspect   vacuum hoses for leaks and replace as necessary. d. Repeat  Step  b.    If  same  vacuum  is  not  observed, replace EGR low temperature vacuum control valve. e. Repeat EGR System Functional Test. If minimum speed drop specification is still not achieved, check    for    plugged    exhaust    gas    passages    and    clean    as required. Fig.  52  Low Temperature Vacuum Control Valve and Connecting Hose Test a. Open carburetor throttle plates and examine exhaust gas  ports  located  in  floor  of  intake  manifold  directly below  carburetor.  If  ports  are  plugged  with  deposits remove carburetor and clean ports as needed. For Canada V-304/345 Engines Only a. Operate   engine   until   it   reaches   normal   operating temperature. b. Shut  off  engine.    Connect  tachometer  and  vacuum gauge to engine. c. Start  engine  and  block  throttle  open  to  give  3000 RPM.  Observe and record tachometer reading. Fig.  53  Single Diaphragm EGR Valve System d. Disconnect EGR vacuum signal hose (Fig.  53) and again record tachometer reading.  If EGR system is functioning   properly   the   minimum   speed   increase should be 50 rpm for the V-304 and 150 rpm for the V-345.    If  rpm  increase  is  less  than  shown  above, EGR  system  is  not  functioning  properly  and  should be checked per the following steps. Check low temperature vacuum control valve as follows: a. With    engine    operating    at    fast    idle,    disconnect vacuum  signal  hose  from  low  temperature  vacuum control valve.  A vacuum signal should be felt at the open end of hose.  If vacuum is felt, reconnect hose and proceed.  If vacuum is not felt, stop engine and check    for    leaking    or    restricted    vacuum    hose    or restricted vacuum port in carburetor. b. With    engine    operating    at    fast    idle,    disconnect vacuum  signal  hose  from  EGR  valve.    A  vacuum signal should be felt at the open end of the hose.  If vacuum  is  felt,  vacuum  supply  and  low  temperature valve are satisfactory (Fig.  53). If vacuum is not felt: a. Check for leaking or restricted vacuum hose. CGES-215  Page 29 PRINTED IN UNITED STATES OF AMERICA

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