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REPAIR (cont) - TM-5-4210-220-12_652
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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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REPAIR (cont) - TM-5-4210-220-12_654
TM 5-4210-220-12 4-28.  ENGINE - Continued d.  Unloader Removal WARNING If  unloader  service  is  required  with  the  air compressor   mounted   to   the   truck   engine, drain the air tanks. (1)    Remove  two  unloader  cover  bolts  (2)  and  one cylinder head bolt (1), then lift the unloader cover (3) from the cylinder head (4). (2)   Remove and discard gasket (5). (3)    Remove  unloader  pins  (7)  and  springs  (8)  from cylinder head (4).  Remove O-rings (6) from pins (7) and discard. e.  Cylinder Head Removal and Disassembly (1)  With the cylinder head still mounted, remove the air  pressure  outlet  fitting  (4)  from  the  top  of  the cylinder head (1), by removing capscrews (5). (2)  To remove the cylinder head (1) from the block (2), remove the five remaining capscrews (3). (3)      Using   a   soft   faced   hammer,   gently   tap   the cylinder head (1) to loosen it from the block (2). (4)  Lift cylinder head (1) from block (2). (5)    Remove  and  discard  the  cylinder  head  gasket (6). (6)      To   disassemble   cylinder   head   (1),   remove unloader    as    detailed    in    d.    preceding,    then proceed to step 7. (7)      Place   cylinder   head   (1)   on   workbench,   with bottom side up. (8)      Using   a   9/16   in.   allen   wrench   remove   the exhaust  valve  seat  (7).    Remove  the  exhaust valve  (8),  exhaust  valve  spring  (9)  and  washer (10) from both exhaust valve ports. (9)  Using a spanner wrench (or Kent Moore J25447 A) remove the inlet valve cages (12), inlet valve springs  (13),  inlet  valves  (14),  inlet  valve  seats (15), and washers (16). 4-539

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