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 1. Moue MODE SELECTOR to
4. Record the LEVEL meter reading
MANUAL LEVEL.
when the compass is settled for reference.
2.
Push cager button (on top of
(c)
Stopping the compass.
Stop the
binnacle) to cage the tyro. The CAGED lamp should
compass as follows:
light.
1. Move RPTR switch to OFF.
3. Push the TILT/AZIMUTH switch in
NOTE
the same direction as that in which the card should
When seas are rough, turn MODE
rotate to return to the desired heading. Release the
SELECTOR to OFF. Wait 30 minutes
switch when the LEVEL METER indicates the
then cage the gyro.
maximum.
2. Move MODE SELECTOR to SLEW.
4. Compass card will slowly rotate
3.
Push cager button (on top of
toward the desired heading.
binnacle) to cage the gyro. CAGED lamp should light.
5. Allow compass to rotate past desired
4. Move MODE SELECTOR to OFF.
heading by 2 or 3 degrees and immediately uncage the
(d) Operation, should compass become
gyro by pushing the cager button on the binnacle.
dumped. If the compass should become dumped after
CAGED lamp should go out.
the wheel has come up to speed, as indicated by a full
6. Move MODE SELECTOR to AUTO
scale LEVEL meter reading and a rapidly slewing
LEVEL. This will approximately level the gyro.
compass, move the MODE SELECTOR to AUTO
7.
Move MODE SELECTOR to
LEVEL. This will stop the slew and level the gyro, but
MANUAL LEVEL and operate TILT/AZIMUTH switch to
will leave compass at some heading other than that
center the pointer of the LEVEL meter.
desired. To restore compass heading, proceed as
8. Move MODE SELECTOR TO RUN.
follows:
Section III. OPERATION UNDER, UNUSUAL CONDITIONS
necessary to add a booster set. If boosters are used, be
2-33. General
sure and remove them from circuit as soon as the
Operation of the tug in extreme cold creates a special
engine is running.
problem with lubricants, above deck icing, and some
b.
Electric
Motors
and Generators. Check
fuel or starting problems with the diesel engines. Other
lubrication orders for correct winter weight lubricants
problems occur during operations in extreme heat.
These will be described in the following paragraphs.
c. Steering System. Test the steering system by
moving rudder, slowly, full left then right, to- dislodge
2-34. Operation in Extreme Cold
any ice that formed at water line.
a. Diesel Engine Starting.
d. Hull and Hull Fittings.
(1) Assure that lubrication meets requirements
(1)
Keep covers installed on all filler
of the lubrication orders (para 3-2).
connections, except when filling tanks, to prevent
(2) Keep the engine room as warm as possible
contamination. Be sure and remove all accumulations
without shutting off ventilation completely.
of ice, or dirt, before removing covers.
(3) Use decompression valves on engines so
(2) Drain all water from firm main risers, until
equipped.
level of standing water is below boat deck.
WARNING
(3) Adjust closure of vent aft of pilot house.
Never use a blowtorch, or other open
This closure can be adjusted to direct some of heated
flame method of heating the fuel or oil
exhaust back into supply system of crew mess and
lines.
quarters for added comfort.
(4) Fuel lines have a tendency to become
e. Running Lights, Searchlight, and Horn. Remove
airlocked when fuel is cold. Vent fuel system before
all ice formations carefully, and frequently, during icing
trying a start.
conditions to keep them always operable.
NOTE
f. Windshield Wipers. There are two types of
Never run engine above a fast idle
blades available. For extreme cold, use the felt blade
until engine oil has warmed, and
soaked in a solution of alcohol and glycerin, half of
pressures have dropped back to
each. Fill blade reservoir with a similar solution.
normal.
NOTE
(5) When starting by air is hard, and air
In nonfreezing weather, fill reservoirs
pressure becomes low, use the cartridge starting aid.
with fresh water to keep salt off
(6) On electric starting diesels, check batteries
windows.
for full charge and tight terminal connections. It may be
2-66
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