TM 9-2815-225-34&P 3-86.  ENGINE RETARDER INSTALLATION THIS TASK COVERS: a.  Installation b.  Slave Piston Adjustment INITIAL SETUP: APPLICABLE MODELS TROUBLESHOOTING REFERENCES All Para. 2-8 SPECIAL TOOLS EQUIPMENT CONDITION None    Rocker arm housing installed (para. 3-84).    Injector and valve adjustment performed TEST EQUIPMENT (para. 3-85). None SPECIAL ENVIRONMENTAL CONDITIONS MATERIALS/PARTS Work area clean and away from blowing dirt and Gasket (75078) 010279 dust. Preformed packing (75078) 010180 GENERAL SAFETY INSTRUCTIONS PERSONNEL REQUIRED None Automotive repairman MOS 63H REFERENCES (TM) TM 9-2320-273-20 TM 9-2320-283-20 LOCATION/ITEM ACTION REMARKS a.  Installation NOTE   The following procedure involves installation of one engine brake retarder.  Installation of remaining engine brake retarders is similar.   The  engine  retarder  over  cylinders  No.  1  and  2  requires  installation  of  a  fan  bracket assembly.  The fan bracket assembly is installed in steps 9 and 10.  Omit steps 3 and 4 if installing engine retarders over cylinders No. 3 and 4, or No. 5 and 6.   If  studs  were  removed  from  rocker  housings,  replace  and  tighten  to  65-75  lb-ft  (88-102 Nm); tighten in sequence as shown. 1. Slave piston (30), slave piston Install on engine brake retarder spring (28), helical retainer assembly (31), if not installed. (27), and retaining ring (26) 2. Master piston (29) and flat Install on engine brake retarder spring (15) assembly (31) with washer (16) and screw (17), if not installed. 3. Weighted valve (33), control Install on engine brake retarder valve outer spring (34), and assembly (31) with control valve cover control valve inner plate (4) and screw (3), if not installed. spring (35) CAUTION Ensure preformed packing (rubber seal ring) in oil inlet supply bore on underside of engine brake   retarder   remains   in   place   during   installation   or   brake   retarder   will   not   operate properly. 3-650