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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Air Inlet Connection Installation
TM 5-4210-220-12 4-28.  ENGINE - Continued s. Cylinder Head Reassembly. (1) Invert cylinder head (1) and insert new copper washers (10, 16) into all four ports. (2)    Insert exhaust valves (9), springs (8) and exhaust valve seat (7).  Using a 9/16 in. allen wrench, tighten valve seats to 70 ft lb (95 Nm). (3) Insert inlet valve seats (15), inlet valves (14), inlet valve springs (13), and inlet valve cages (12). NOTE The  inlet  valve  and  inlet  valve  springs  must  be  centered  to  insure  the  valve  is  not  torqued between the valve seat and the valve cages to 75 ft lb (100 Nm) using special tool J25447A. (4) Turn   the   head   over   to   insert   the   new unloader springs (6). (5) Install new O-rings (4) onto unloader pins (5). (6) Apply  silicone  grease  (item  27,  Appendix E) to the O-ring, forming a ball around it. (7) Insert    the    unloader    pins    (5)    into    the cylinder head. (8) Place   the   unloader   gasket   (3)   on   the unloader  cover  (2).    Assemble  these  two items  to  the  head  as  a  unit  compressing the  unloader  springs  and  hold  firmly  until the unloader cover bolts (1) and lockwashers   or   hardened   plain   washers are    installed.        Tighten    these    bolts    to approximately  10  in.  lb  (1.2  Nm)  torque. These   bolts   will   be   tightened   to   a   final torque after the head bolts are torqued. t. Cylinder Head Installation. (1) Place a new head to block gasket on the cylinder   block.      Place   the   head   on   the gasket and install the six head bolts.  The one   long   head   bolt   is   to   be   inserted through the unloader cover plate.  Tighten the    head    bolts    to    20    ft    lb    (27    Nm) following  the  order  as  shown.    Retighten the  head  bolts  to  30  ft  lb  (41  Nm)  in  the same order. (2) Tighten the unloader cover bolts to 125 in. lb (14 Nm).  torque after torquing the head bolts. (3)  Install    air    outlet    connection    (4)    using screws  (5).    Coat  flange  area  with  gasket eliminator (item 14, Appendix E). 5-549

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