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 TM 5-1940-277-20
TM 1940-20/2
COMPONENT MAINTENANCE INSTRUCTIONS (UNIT LEVEL)
Section I. GENERAL
This chapter contains maintenance information for the bridge erection boat, the major subassemblies, subsystems, hull
and associated items. Tasks discussed in this manual are those to be performed by Unit Maintenance personnel as listed
in the Maintenance Allocation Chart.
3-1.
ENGINES. The engines are installed side by side in the midsection of the boat. All references to rotation of the
engine or location of components are based on viewing the engine from the rear (transmission end). Each engine
is an in-line six-cylinder, four-cycle, turbocharged diesel.
The MK1 and MK2 engines will not be operated out of water nor operated In the
water with the water jet disengaged for more than 20 minutes at Idle speed. Ensure
that the engine water temperature does not rise above 194F Serious engine dam-
age could result if this is not observed.
For out of water operation during unit or higher maintenance actions, refer to
3-2. COOLING SYSTEM
a.
The MK1 uses two closed fresh water systems. Raw water is also drawn from the hydrojet unit to pass through
a remote heat exchanger unit which cools the fresh water flowing through the remote unit's coil. The exhaust
system expels exhaust gases and raw water via port and starboard wet exhaust outlets.
The MK1 and MK2 engines will not be operated out of water nor operated in the
water with the water jet disengaged for more than 20 mlnutes at idle speed. Ensure
that the engines water temperature does not rise above 194F. Serious engine dam-
age could result if this is not observed.
For out of water operation during unit or higher maintenance actions, refer to
b.
The MK2 engine cooling system consists of two separate systems, the primary cooling system and the second-
ary cooling system, which share the same reservoir. Both cooling systems circulate coolant through keel cool-
ers where heat is exchanged from the coolant to the raw water beneath the hull.
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