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|  MIL-E-23457B(SHIPS)
3.8.8.3.3 Type I and II governors. Governors for engines which are required to operate
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in parallel on a single propulsion shaft system shall be provided with a load limiter or
fuel stop which will automatically control engine torque to safe limit. Regulating governors
shall be provided with a steady-state speed regulation mechanism, adjustable from O to 5
percent of rated-speed.
3.8.8.3.1 Maneuverability of direct reversing engines. When tested in accordance with
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4.4.2.8, the engine shall demonstrate capability of being completely reversed within
the governor limitations specified in 3.8.8.3. Compressed air and time requirements shall
be determined.
3.8.8.4 Overspeed protection. As protection against dangerous engine overspeed due
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to failure of the regulating governor its linkage or other engine malfunction, each engine
shall be equipped with a separate and independent speed limiting device that will control
the engine when it attempts to exceed 115 percent of its full rated-speed. The speed
limiting device shall take control at overspeed and stop the engine completely by reducing
the fuel injection output to zero or by blocking the engine's combustion air supply or both.
This device shall require manual resetting. The speed limiting device shall not attempt to
control the engine by any system that cuts off the fuel supply to the engine fuel pump.
Governor and overspeed devices shall be tested in accordance with 4.4.2.6 and 4.4.2.7.
3.8.8.5 Low lubrication oil pressure protection. When specified (see 6.2.1) the
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engine shall be provided with device which will automatically shut-down the engine when the
lube oil pressure drops to a point which will cause failure of the oil wetted wearing parts.
The device shall actuate at a pressure as selected by the engine manufacturer to insure
protection of the engine. The shut-down device shall be equipped with a manual override.
Instruments shall be furnished with each engine for the
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3.8.9 Instrumentation.
following measurements:
Pressure indicators:
(a)
(1) Fresh water pump discharge.
(2) Sea water pump discharge.
(3) Lubricating oil pressure pump discharge.
(4) Lubricating oil pressure at the engine inlet.
(5) piston cooling oil (if separate pumps are used).
(6) Fuel oil pump discharge.
(7) Fuel oil pressure at injection pump inlet or fuel header.
(8) Scavenging or supercharging air pressure.
(9) Starting air pressure at the engine.
(10) Lubricating oil pressure at the turbocharger or blower.
(b) Temperature indicators:
(1) Lubricating oil from engine.
(2) Fresh water from engine.
(3) Water from the intake air cooler (if used) (see note).
(4) Sea water to and from heat exchanger (see note).
(5) Fresh water to lubricating oil cooler (see note).
(6) Fresh water to the engine (see note).
(7) Lubricating oil to engine (see note).
Temperature indicators shall be furnished for installation in ships piping
Note:
by the installing activity.
(c) Alarms:
(1) Low lubricating oil pressure.
(2) High temperature cooling water.
(d) Electrical temperature pyrometer and selector switch:
(1) One thermocouple at each cylinder exhaust outlet and exhaust side of
turbocharger (s).
(e) Tachometer:
(1) Engine speed.
(f) Time indicator or hour meter:
(1) Engine operating time.
3.8.9.1 Panel. An instrument panel shall be furnished with each engine capable of
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being mounted on the engine, off of but adjacent to the engine or located at the engine
control stand. Panel mounted instruments shall be flush mounted and 3-1/2 or 4-1/2 dial
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