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 (5) Install the stationary endbell, head and shell ring.
NOTE
Tighten the nuts evenly.
On some vessels the heat exchanger must
(6) Install the zinc corrosion plates (anodes) and
be lowered to the deck before removing
tighten the nuts.
the endbells and tube bundle.
(7) Install the fresh water bypass line. Tighten all nuts
and unions.
(5) Remove the head and ring at the raw water
(8) Reconnect all (fresh and raw) water lines.
discharge end of the heat exchanger and break the tube
(9) Open fresh and raw water valves to the heat
bundle free. Pull the tube bundle out of the heat exchanger
exchanger after closing the drain valve.
housing.
(10) Start the auxiliary fresh and raw water pumps.
(6) Remove nuts securing the zinc corrosion plates and
(11) Watch fresh and raw water circulation for leaks. If
remove the plates.
leaks are found, repair by tightening flanges or installing new
c. Cleaning, Inspection, and Repair.
gaskets.
(1) Inspect the zinc corrosion plates (anodes). If the
(12) Secure the fresh and raw water pumps.
plates are excessively corroded, replace the zinc. Clean the
gasket surface and use a new gasket when reinstalling the
NOTE
plates.
When the main engine pumps are put into
(2) Remove the packing gland and the packing from
operation, check the stuffing box and
the stuffing box.
packing gland. Be sure the packing gland
(3) Inspect the tube bundle, both inside and out. If the
tubes are coated, or partially clogged, they must be cleaned.
nuts are tightened evenly so the tube
Clean the tubes by circulating a mild solution of oakite
bundle is free to contract and expand
through the bundle. If the tube bundle remains partially, or
without causing strain.
totally clogged, report to higher maintenance for possible
replacement.
e. Maintenance Adjustments.
(4) Clean the heat exchanger housing inside and out
(1) When packing has been replaced in the stuffing
with a cleaning solvent conforming to Fed. Spec. P-D-680,
box, inspect for leaks frequently, and tighten nuts on packing
and hose down with clean fresh water. Wipe dry.
gland with an even pressure on each nut.
(5) Use a wire brush to clean the packing gland. Wash
(2) Prevent, or stop leaks, by tightening all flange bolts
in clean fuel oil and wipe dry. Use a wire brush to clean all
and nuts.
gasket surfaces. Wash in clean fuel oil and wipe dry.
(6) Inspect the fresh water bypass valve packing. If the
3-22. Lubrication Oil Pump (Engine)
packing ring is tightened all the way down, remove the ring
and packing. Repack the valve, install the packing ring, and
gear type pump fitted with reversing valves to give a positive
tighten.
flow of oil to engine at either direction of rotation. The pump
is located at forward end of the engine. This pump is driven
NOTE
by the crankshaft through the oil and water pump drive. It
Use new gaskets when assembling the
supplies oil to the lubrication system under pressure, and
heat exchanger.
keeps the force feed lubricator constantly filled.
b. Removal.
d. Reassembly.
(1) Close the shutoff valves on suction and discharge
(1) Install the tube bundle in heat exchanger housing.
lubrication oil lines.
(2) Repack the stuffing box. Do not allow the packing
(2) Disconnect the suction and discharge lines at the
to overlap.
pump.
(3) Install the stuffing box and floating endbell. Tighten
(3) Remove nuts (6, fig. 3-25) securing housing (21) to
nuts evenly.
bracket (8).
(4) Tighten nuts evenly on the packing gland.
3-59
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