9.4.1 Any main diesel propulsion system shall
have satisfactory torsional vibration and other vibrational characteristics
verified by individual and combined torsional and other vibration
analyses for the system and its components from power unit through
to propulsor.
9.4.2 All external high-pressure fuel delivery
lines between the high-pressure fuel pumps and fuel nozzles shall
be protected with a jacketed tubing system capable of containing fuel
from a high-pressure line failure. The jacketed tubing system shall
include a means for collection of leakages and arrangements shall
be provided for an alarm to be given of a fuel line failure.
9.4.3 Engines of a cylinder diameter of 200 mm
or a crankcase volume of 0.6 m3 and above shall be provided
with crankcase explosion relief valves of an approved type with sufficient
relief area. The relief valves shall be arranged with means to ensure
that discharge from them is directed so as to minimise the possibility
of injury to personnel.
9.4.4 The lubrication system and arrangements
shall be efficient at all running speeds, due consideration being
given to the need to maintain suction and avoid the spillage of oil
in all conditions of list and trim and degree of motion of the craft.
9.4.5 Arrangements shall be provided to ensure
that visual and audible alarms are activated in the event of either
lubricating oil pressure or lubricating oil level falling below a
safe level, considering the rate of circulation of oil in the engine.
Such events shall also cause automatic reduction of engine speed to
a safe level, but automatic shutdown shall only be activated by conditions
leading to a complete breakdown, fire or explosion.
9.4.6 Where diesel engines are arranged to be
started, reversed or controlled by compressed air, the arrangement
of the air compressor, air receiver and air starting system shall
be such as to minimise the risk of fire or explosion.