AIR COMPRESSOR - MIDLAND BRAKE MODELS EL-1300, EL-1600 5. Turn   compressor   assembly   over   and   position connecting   rod   on   crankshaft   journal   making sure  that  the  inserts  are  in  place.    Install  caps and inserts matching arrows on bearing cap and rod as shown in Figures 11 and 12. Tighten connecting rod bolts according to  listing In  TORQUE  CHART  in  this  Section.    Use  a  12 point 5/16 in.  socket on connecting rod bolts. Figure 11 - Piston and Connecting Rod Assembly Figure 12 - Connection 6. Install  the  second  connecting  rod  assembly  in the same manner. CYLINDER HEAD NOTE - Refer to Figure 5 during the following procedures: 1. Turn  cylinder  head  upside  down  and  insert  new washers  (Item  12),  exhaust  valve  springs  (Item 9), exhaust  valves  (Item  10),  and  exhaust  valve seats (Item 11).  Tighten exhaust valve seats to torque  valve  specified  in  TORQUE  CHART  In this Section. 2. With   head   still   positioned   upside   down,   Insert new  washers  (Item  12),  inlet  valve  seats  (Item 16),   inlet   valves   (Item   13),   inlet   valve   springs (Item 15) and inlet cages (Item 14).  Inlet valves and springs must be centered to insure the valve is   not   tightened   between   inlet   valve   seat   and cage.    Tighten  valve  cage  to  specified   torque valve using valve cage tool SE-2613 as shown in Figure   6.      Refer   to   TORQUE   CHART   in   this Section. UNLOADER 1. Install   new   O-ring   seals   between   flanges   on unloader pins.  (Refer to Figure 4.) 2. Form a 14mm (9/16 in.) ball  of  lubricant  around O-ring  seal.    Use  a  silicone  lubricant  which  is intended    for    dynamic    lubrication    between    oil resistant  rubber  seals  and  metal  parts,  meeting MIL-L-4343A requirements. Dow-Corning Corporation     #33     medium     weight     grease     is suggested.        (For    optional    lubricant    refer    to BRAKES-AIR, COMPONENTS, General Lubrication Specifications, Item 3. 3. Position   unloader   assemblies   and    springs    in bores of cylinder head. 4. Place     unloader     gasket     on     unloader     cover. Assemble these two items as a unit compressing the unloader springs and hold until the unloader cover  bolts  and  lockwashers  or  hardened  plain washers are installed. 5. Tighten  unloader  cover  bolts  to  about  1.1  N-m (10 lb-in) torque. IMPORTANT -    Unloader cover bolts should be tightened to torque valve after cylinder head bolts have been tightened     to     second     step     torque valve. CYLINDER HEAD TO CYLINDER BLOCK Position new cylinder head gasket on cylinder block. With gasket aligned, position cylinder head on block. Insert the longest head Volt through the unloader cover center hole; the other five head bolts through the remaining holes.  Tighten head bolts in the sequence noted in Figure 13.  This is a two step process: first, tighten to the first torque valve noted in TORQUE CHART; second, retighten to second valve noted in TORQUE CHART. Tighten unloader cover bolts to torque valve listed in TORQUE CHART in this Section. CTS-4077Y Page 11