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Fig.  42  Vacuum Chamber Details
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  47  Plunger Position During High Engine Speed
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 engine   to   idle   and   observe   position   of   inlet   tube damper.    If  damper  has  not  rotated  all  or  part  way down   to   allow   some   cold   air   to   enter   inlet   tube, replace temperature sensor. Procedure for servicing the thermal pellet type air cleaner is as follows: (Cargostar & S-Series Vehicles) a. With    the    engine    cold    and    ambient    under    hood temperature   below   32   deg.      C   (90   deg.      F),   the damper should be closed to the cold air inlet (open to the hot air inlet).  This closed to cold air inlet can be checked by looking in the end of the inlet. b. With  the  engine  at  operating  temperature  and  the ambient  under  hood  temperature  above  57  deg.    C (135 deg.  F), thermal pellet should open the damper allowing cold air to enter the cleaner and at the same time shut off the hot air inlet. Fig.  44  Pellet Type Controlled Air Cleaner c. If the damper does not operate as described above, reach in the inlet, move the damper open and check to see if it is sticking. If damper is moving freely and the linkage is connected, then the thermal pellet must be at fault and should be replaced. When replacing the thermal pellet do not tighten the pellet assembly with a tool.  Tighten finger tight only. Use  locking  compound  on  the  threads  to  secure  in place.   If  a  tool  is  used,  too  much  pressure  may  be applied changing the calibration of the thermal pellet and linkage assembly. 13.   Check PCV System Hoses and Replace, if necessary, Clean PCV Valve, If necessary. a. Remove valve from crankcase side, leaving the other end of the valve in hose and connected to intake manifold. b. With  the  engine  operating,  a  vacuum  should  be  felt at the end of the valve.  If no vacuum is present, the valve, hose and fitting should be removed and cause of restriction determined. c. Check  the  inner  chamber  of  the  valve  to  see  that  it can be moved freely.  This may be accomplished by inserting    a    stiff    wire    into    the    valve    body    and observing  whether  or  not  the  plunger  can  be  readily moved, or shake the valve and listen for rattle.  If the plunger does not move, soak in carburetor cleaner. Fig.  45  Typical Air and Vapor Flow Through the System 13A. Positive Crankcase Ventilation Valve (PCV) Operation. Since the vacuum supply for the PCV system is from the intake manifold, the flow through this system into the manifold must    be    controlled    in    such    a    manner    that    it    varies    in proportion   to   the   air-fuel   ratio   being   drawn   into   the   intake manifold. The  PCV  valve  varies  the  amount  of  flow  through  the system according to the various modes of operation (i.e. CGES-215  Page 26 PRINTED IN UNITED STATES OF AMERICA

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