Table 17-4.  Preventive Maintenance Checks and Services for Workboat, Lifesaving, and Firefighting Systems (Continued) B -  Before D -  During A -  After D -  Daily H -  Hourly Interval INTERVAL ITEM PROCEDURES EQUIPMENT ITEM TO BE CHECK FOR AND HAVE IS NOT READY/ NO. INSPECTED REPAIRED OR ADJUSTED AVAILABLE IF B   D   A   D H AS NECESSARY 3) Clean mating surfaces on new filter and filter receptacle.  Coat new rubber seal with clean oil and install. 4) Screw on new filter by hand until it touches contact surfaces of filter receptacle.  Turn filter 1/2 turn more. Do not tighten filter any further. 5) Fill crankcase with 11 qt of oil. 6) Start engine and run at idling speed. Check that oil gauge shows normal pressure. 7) Check oil filter for leaks.  If necessary to stop seepage, tighten very slightly by hand.  Check oil level to make sure it is between dipstick marks. 4 • • 200 hrs Battery Box WARNING and Batteries Fumes from batteries may be flammable and explosive.  Do NOT smoke or have open flame when checking or working on battery bank.  Battery electrolyte presents potential health hazards.  Contact with eyes and skin should be avoided.  Safety glasses, gloves, and rubber aprons must be worn when han- dling this chemical.  Electrolyte contains sul- furic acid which can cause severe burns and is highly toxic to skin, eyes, and respiratory system. a. Check battery boxes (located in engine compartment, port and starboard) for loose or missing securements or fasten- ers.  Tighten and replace as necessary. b. Check batteries, casings, and battery Battery casing cables for cracks and tight connections. loose or cracked. c. Check batteries for proper electrolyte level.  Add distilled or clean tap water to bring level above plates. d. Make sure battery selector switch is set to ALL position. e. Check that batteries, cables, and casings are corrosion-free and coated with anti- corrosion grease. 17-15