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In connection with the maintenance, various bushings,
bearings, washers, retainers, gaskets and seals contained within
the oil and water pumps are also replaced. Many of the parts
within these pumps--the gears, brackets, couplings, bolts, nuts,
keys, housings, dowels, sleeves, shafts, impellers, springs,
spacer plates, slingers, plugs and rings--are reused, assuming
they are within acceptable operating tolerances. Other small
parts, such as gaskets, seals and filters, are replaced as an
incidental part of the disassembly and reassembly processes. The
lower liner bore inserts--pieces of cast metal that rest between
the bottom of each cylinder liner and the crankcase so as to
provide a seal between the crankcase and the towboat engine’s air
box and to enable air to be retained in the air box while the
towboat’s engine is in operation--are replaced at a cost of $40
each.
Certain moving and nonmoving parts are cleaned and visually
inspected for obvious operational problems as part of the
maintenance, but unless problems are identified during the
inspection process, no work is performed on such parts,
including: The engine governors, the engine turbochargers, the
engine crankcase, oil pan, oil and fuel lines, the lower main
bearings, the piston cooling oil pipes, the cylinder test valves,
and the water inlet tubes.
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