TM 9-2815-225-34&P 3-87.  AIR AFTERCOOLER INSTALLATION THIS TASK COVERS: Installation INITIAL SETUP: APPLICABLE MODELS REFERENCES (TM) All TM 9-2320-273-20 TM 9-2320-283-20 SPECIAL TOOLS None TROUBLESHOOTING REFERENCES Para. 2-8 TEST EQUIPMENT None EQUIPMENT CONDITION Engine retarders installed (para. 3-86). MATERIALS/PARTS Lubricant, high-pressure (Appendix C, Item 15) SPECIAL ENVIRONMENTAL CONDITIONS Three gaskets (15434) 3008591 Work area clean and away from blowing dirt and Two lockwashers (15434) S-604 dust. (M915A1/Big Cam III only) Three lockwashers (96906) MS122032 GENERAL SAFETY INSTRUCTIONS (M915/Big Cam I only) None PERSONNEL REQUIRED Automotive repairman MOS 63H LOCATION/ITEM ACTION REMARKS Installation NOTE   Perform steps 2 and 5 for M915/Big Cam I.   Perform steps 3 and 6 for M915A1/Big Cam III. 1. Three new gaskets (9) Install on three cylinder heads (1). Use a small amount of high-pressure lubricant to hold gaskets (9) in place. 2. Three screws (5), new Install on bottom hole of each Thread in three to five turns. lockwashers (4), and cylinder head (1). washers (3) (M915/Big Cam I) 3. Screw (8), two screws (5), Install on bottom hole of each Thread in three to five turns. three new lockwashers (4), cylinder head (1). and washers (3) (M915A1/ Big Cam III) 3-656