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Fig.  47  Plunger Position During High Engine Speed
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  52  Low Temperature Vacuum Control Valve and Connecting Hose Test
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 deposits from pintle and seat, if necessary. To clean deposits from pintle and seat of EGR valve, use a   sand   blast   type   spark   plug   cleaner   and   the   following procedure: (1) Prepare  spark  plug  cleaner  by  installing  rubber adapter  with  22  mm  (7/8")  hole  over  cleaning (blast) port.  Do not install metal adapter clamp (Fig.  50). (2) Insert pintle of EGR valve through hole in rubber plug cleaner adapter. (3) Holding  EGR  valve  tightly  down  adapter,  apply sand blast to clean pintle. CAUTION Safety goggles should be worn while performing cleaning operation. Fig.  50  Cleaning EGRH Valve (4) After cleaning exposed pintle, hold EGR valve in both  hands  and  press  in  diaphragm  to  retract valve  pintle  into  valve  housing.  Use  a  25  mm (1")   long   bolt   (3/4"   long   for   dual   diaphragm valves) to hold pintle in retracted position.  Apply masking tape to cover outlet port of valve. (5) With pintle opening of valve aligned with hole in cleaning  adapter,  hold  EGR  valve  down  tightly against  adapter  and  apply  sand  blast  to  clean interior of valve housing and valve seat. d. After  cleaning,  blow  all  excess  sand  from  interior  of valve housing and remove bolt. e. Recheck valve for proper operation and seating. f. Replace with new valve, if necessary. 15.   Check EGR System with Functional Test and Clean or Replace,   If   necessary.      (V-345   and   V-392   Engines Only) Perform EGR System Functional Test as follows: a. Operate   engine   until   it   reaches   normal   operating temperature. b. Shut   off   engine.      Connect   tachometer.      Connect vacuum  pump  with  vacuum  gauge  to  EGR  system vacuum hose at carburetor. c. Plug fitting at carburetor. d. With   tachometer   installed,   operate   all   engines   at 2000 RPM. e. Apply    specified    vacuum    (see    Emission    Control System Tune-Up Specifications). Fig.  51  Complete EGR System Test f. See Emission Control System Tune-Up Specifications for engine speed drop when vacuum is applied.   This   procedure   checks   not   only   the   EGR valve  but  the  intake  manifold  and  related  passages as well. CGES-215  Page 28 PRINTED IN UNITED STATES OF AMERICA

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