TM  10-3930-638-24&P 2-17.   COOLING   SYSTEM   MAINTENANCE   (cont) f. Fan and Belt (cont). STEP LOCATION ITEM ACTION REMARKS REMOVAL 1 Alternator a.  Adjustment Remove screw and mounting screw b. Alternator Remove c. Fan belt (1) Remove 2 Engine a. Four cap Remove screws  (2) and  lock washers  (3) b. Fan blade as- Remove sembly  (4) c. Water pump Remove CLEANING pulley  (5) WARNING Dry  cleaning  solvent  (P-D-680),  used  to  clean  parts  is  toxic  and flammable. Wear protective goggles and gloves and use only in a well  ventilated  area.  Avoid  contact  with  skin,  eyes,  and  clothes and don’t breathe vapors. Do not use near open flame or exces- sive heat and don’t smoke when using it. Failure to do so could cause serious injury. If you become dizzy while using cleaning solvent,  get  fresh  air  immediately,  and  get  medical  attention.  If contact with skin or clothes is made, flush with large amounts of water. If contact with eyes is made, wash eyes with water immed- iately,  and  obtain  medical  aid  immediately. 3 All parts Clean Use  cleaning  solvent  P-D-680;  dry  thor- oughly INSPECTION 4 Fan belt (1) Inspect Replace if cracked, ruptured, or worn 5 Fan  blade  assem- Inspect Replace  if  blades  are  cracked,  bent  or bly (4) broken 6 Water pump Inspect Replace if bent, cracked, or mounting pulley (5) holes damaged INSTALLATION/REPLACEMENT 7 Engine a. Water pump Position On water pump assembly pulley (5) b. Fan blade as- Position On  water  pump  pulley sembly  (4) Change  2  2-93