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TM 9-2815-225-34&P 3-4. LIFTING ENGINE WARNING The stamped, steel oil pan on M915A1/Big Cam III and M915/Big Cam I engines must not be used  to  support  weight  of  engine;  the  pan  will  permanently  deform  and  may  collapse, allowing  engine  to  fall  over.    Failure  to  comply  may  result  in  damage  to  equipment  and injury to personnel. Connect engine lifting fixture and a suitable sling to engine lifting brackets, and raise engine for draining, cleaning, and installation on maintenance stand.  Refer to para. 3-13 and mount engine on maintenance stand. 3-5. DRAINING ENGINE a. Remove oil drainplug from right rear side of oil pan.  Drain engine oil completely, then replace drainplug.  Tighten drainplug to 60-70 lb-ft (81-95 Nm).    Remove  oil  filter  (M915/Big  Cam  I)  or  bypass  oil  filter  and  full-flow  oil  filter  (M915A1/Big  Cam  III)  from  oil cooler, and drain oil filter(s) and oil cooler housing. b. Remove ether quick-start thermostat from right rear side of cylinder block.  Open drainvalve on rear end of oil cooler.  Open drainvalve on thermostat housing.  Completely drain coolant from cylinder block and oil cooler, then close drainvalves and replace ether quick-start thermostat. c. Open drainvalve on bottom of fuel/water separator.  Completely drain fuel from separator, then close drainvalve. 3-6. CLEANING a. General Instructions.   Cleaning  procedures  will  be  the  same  for  many  of  the  parts  and  components  that  make  up  engine subassemblies.  Follow general cleaning procedures detailed in steps b. through h. b. Importance of Cleaning.    Great  care  and  effort  are  required  in  all  cleaning  operations.    The  presence  of  dirt  and  foreign material  is  a  constant  threat  to  satisfactory  engine  operation  and  maintenance.    The  following  guidelines  apply  to  all  cleaning operations: (1) All parts must be cleaned prior to inspection, after repair, and before assembly. (2) Hands must be clean prior to handling cleaned parts. (3) After cleaning, all parts must be covered or wrapped in plastic or paper to protect them from dust and debris. WARNING Approved solvents may be flammable and will not be used near open flame.  Use only in well-ventilated area.  Failure to comply may result in injury to personnel. Compressed  air  used  for  cleaning  purposes  will  not  exceed  30  psi.    Use  only  with effective chip guarding and protective equipment such as goggles or shield, gloves, etc. Failure to comply may result in injury to personnel. c. External  Engine  Cleaning.    All  electrical  components  or  other  parts  that  could  become  damaged  by  cleaning  or  moisture must be removed.  Close all openings on the engine with waterproof tape or suitable plugs.  Thoroughly clean all external parts and outer surfaces.  Ensure no foreign material enters working parts of the engine.  Wash the engine using water under pressure to remove mud and dirt.  Remove oil and grease using a stiff brush and approved solvent.  Dry engine with compressed air. 3-3


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