NW Explorations Navigator, Руководство по эксплуатации

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NW Explorations
NAVIGATOR OPERATING MANUAL
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Check the coolant level
The heat exchanger coolant expansion tanks are located
on the forward end of each engine, with caps on the top.
If when the engines are cold, there is coolant in the tank,
all is OK!
If coolant is needed, determine if there is any sign of a
coolant leak under the engine, and if there is, do not run the
engine; if no leak, add coolant to the tank from the jug of
pre-mixed antifreeze/corrosion inhibitor/water supplied on the
boat. To add coolant, remove the cap; be sure to put it back
on. Do not add coolant above the line!
Visually inspect the room
Whenever you’re in the engine room, ask yourself,
“Does everything look right?”. Look at the pads under the engines and
transmissions: while some drips are normal, there shouldn’t ever be
substantial accumulations of any fluids!
Check the sea strainers once a week,
... or immediately if either engine runs “hot”. The engine strainers are in
the forward end of the engine room bilge. The refrigeration sea strainer is
just forward of them. To check a strainer, shine a flashlight through it. While
some “fuzziness” from trapped thin growth is normal, you should see the
light clearly on the other side; if obscured, clean the strainer. See below.
4J3: Engine Controls
Navigator is fitted with standard controls at each helm. The black- knobbed
controls are the shift levers, the red-knobbed controls are the throttles.
4J5: Engine Operating Parameters
These Cummins engines are red-lined at 2800 RPM. Maximum cruise
is 2400 RPM. However, the realities of vessel hull design and powerplant engineering dictate that higher
RPM operation is very inefficient on semi-displacement vessels like this one, so you will find these operating
specifications to be true (gallons per hour, speeds, and nautical miles/gallon are estimates):
RPM Gallons/hour, Total both Engines* Speed/Knots* Nautical Miles/Gallon*
1400 4.0 8.00 2.0
1600 5.0 9.00 1.80
1800 6.5 9.5 1.46
2000 12.0 10.5 .88
2400 24.0 12 .5
As you can see, each extra knot is very expensive once you have passed “displacement speed” on the vessel
hull; this is not a “planing” boat! It is sensible to operate the boat in the 1600-1800 RPM range, and you’ll enjoy
quieter, more pleasant cruising and economy, too!
The genset sea strainer.
The coolant caps are atop each tank (the
small black hose runs to the cap’s fitting).