TM 9-2815-225-34&P 3-81. OIL PAN INSTALLATION THIS TASK COVERS: Installation INITIAL SETUP: APPLICABLE MODELS REFERENCES (TM) All TM 9-2320-273-20 TM 9-2320-273-34 SPECIAL TOOLS None TROUBLESHOOTING REFERENCES Para. 2-8 TEST EQUIPMENT None EQUIPMENT CONDITION    Front gear cover installed (para. 3-75). MATERIALS/PARTS    Flexdisk or flywheel, flywheel housing, and rear Grease, automotive and artillery, GAA cover installed (para. 3-80). (Appendix C, Item 13) Gasket and seal kit (15434) 3801235 SPECIAL ENVIRONMENTAL CONDITIONS Four lockwashers (96906) MS35338-45 Work area clean and away from blowing dirt and Four lockwashers (96906) MS35338-47 dust. (M915A1/Big Cam III), (one M915/Big Cam I) Two lockwashers (96906) MS35338-48 GENERAL SAFETY INSTRUCTIONS Two lockwashers (15434) S-608 None (M915/Big Cam I) Lockwasher (15434) S-610 (M915/Big Cam I) PERSONNEL REQUIRED Automotive repairman MOS 63H LOCATION/ITEM ACTION REMARKS Installation NOTE Do not rotate engine more than 90 from an upright position during oil pan installation. Otherwise, pushrods could fall out.  If any pushrods fall out, refer to para. 3-71 to install. For M915/Big Cam I only, it may be necessary to refer to TM 9-2320-273-34, installation of    engine    oil    heater.        For    engine    oil    heater    thermostat    installation,    refer    to TM 9-2320-273-20. Installation  of  oil  pan  is  similar  between  M915/Big  Cam  I  and  M915A1/Big  Cam  III engines.  M915/Big Cam I engines use a cast aluminum oil pan that is mounted to the flywheel housing with additional fasteners.  M915A1/Big Cam III engines use a stamped steel oil pan that does not mount with flywheel housing. Perform steps 7, 9, 12, 13, and 14 for M915/Big Cam I only. 1. Cylinder block (1) Apply a thin coat of GAA grease to oil pan mounting surface. 2. New oil pan gasket (2) Line up holes with holes in cylinder block (1) and install on cylinder block (1). 3-620