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 TM 55-1905-221-14-1
2-11. FOUL WEATHER OPERATION.
a. Check to see that all gear and equipment is properly stowed and secured.
b. Should the engines be operated at high speed in rough water the engines will surge when the propellers leave
the water, causing excessive vibration. The governor may be overworked under these conditions, and it will be
necessary for the protection of the engines and safety of the vessel to reduce the speed of the engines until a safe
operating speed is attained as determined by the roughness of the sea.
2-11.1 EMERGENCY PROCEDURES.
a. Transmission Backdriving. All current twin disc production marine transmissions can be backdriven (propeller
windmilling with dead engine) for the following conditions, provided that the vessel speed, when backdriving the marine
transmission, does not exceed the normal propulsion speed of the vessel: Towing to deliver a boat, towing home a boat
with engine trouble, sail boat auxiliary and multiple screw vessel with engine(s) shutdown.
b. Selective Methods Required for Backdriving.
(1) Start the engine and operate the marine transmission in neutral at normal fluid pressures for a minimum of
five minutes, doing this once every eight hours. Maintain the backdriven marine transmission oil level at the full mark on
the dipstick.
(2) In the case of an inoperable engine where pressure lubing the transmission is not possible, plug the
dipstick tube and fill the unit with oil. Then, before backdriving, drain the oil down to full oil level. Repeat this process
every eight hours.
SECTION V. OPERATION OF AUXILIARY EQUIPMENT
2-12. BILGE PUMPING AND OIL/WATER SEPARATION SYSTEM.
a. Description.
(1) The oil-water separation system includes the oil-water separator, valves, piping, strainer, holding tank and
sight gage, holding tank store discharge fitting, intake fitting, hose fittings, engine oil pan drain fitting, rubber hose, and
foot valve with strainer.
(2) The bilge pumping system includes three bilge pumps which are belt driven from the inboard engines, a
suction manifold with nine lines to the various bilge compartments, bilge strainers and check valves, discharge lines, and
priming lines from the sea water system to the bilge pumps. Engagement and disengagement of the bilge pumps is by
NOTE
All bilge pumping must be through an oil-water separator when vessel is in rivers or harbors.
b. Operation.
(1) To operate the bilge pumping system through the oil-water separator follow instructions on placard located
on engine room port side bulkhead.
(2) To operate the bilge pumping system without the oil-water separator proceed as follows:
(a) Remove wire seals from valves.
(b) Open valves in priming lines.
(c) Open bilge pump overboard discharge valve (fig. 2-25).
2-58 Change 1
*U.S. GOVERNMENT PRINTING OFFICE: I993 - 755-028/80051
PIN: 066242-001
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