TM 55-1930-209-14&P-19 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 200 hrs c.     Change air filter.  Clean around air filter housing.  Loosen four clamps and remove cover on air intake housing.  Change filter and install in reverse order.  Make sure dirt does not enter housing while chang- ing filter. 200 hrs d.      Change crankcase ventilation air filter. Unscrew old filter and discard.  Screw in new filter. 200 hrs e.      Turn off fuel valves: 1) Barge 1.  Turn off both incoming and return fuel line valves on portside stem bulkhead above the Racor fuel filter.  These two shutoff valves are not installed on Barges 2 and 3. 2) Barges 2 and 3.  Turn off fuel oil at turnoff valves on top of fuel tank.  Be prepared for more fuel oil spills as fuel in line drains out through filter mount- ing. 200 hrs f.   Change engine-mounted fuel filter (may not be mounted on all workboat engines). 1) Unscrew old filter and discard.  Avoid fuel oil splashes and spills. 2) Check that contact surface in cover Filter gasket dam- and filter gasket are clean and aged. undamaged. 3) Carefully fill new filter with clean fuel oil and screw on by hand until gasket touches cover.  Tighten no more than another 1/2 turn. 200 hrs g.      Change Racor fuel filter on stem bulk- head. 1) Use T-handle on top of filter to unscrew top. 2) Inspect gasket.  If reusable, clean and retain.  If not reusable, replace gasket. 3) Remove old filter element and discard. 4) Insert Racor replacement element (Racor part 2010SM, or military equiv- alent) over center tube with a turning motion. 5) Fill filter with clean fuel oil.  Lubricate gasket and T-handle O-ring with fuel oil. 17-12