Question # 63

How can fuel be taken off a cylinder without stopping the engine?

How can fuel be taken off a cylinder without stopping the engine?

By: Dimitros
on Sept. 30, 2016, 10:53 a.m.

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Answer(s):

If it becomes necessary to take fuel off a cylinder without stopping the engine, the fuel pump crosshead is lifted until the roller is clear of the cam peak. The by¬pass on the fuel valve must be opened before lifting the crosshead.
A lever is supplied by the engine builder which connects to the pump cross¬head through a bolt and finger-plate. Lifting the bolt with the lever connects the finger-plate to the underside of the pump crosshead, and lifts it as the lever is pushed downwards or upwards depending on the linkage arrangement. After lifting, the crosshead can be fastened in the lifted position.
In some cases the pump crosshead is lifted by a small pin on an axle. The pin is eccentric to the axle axis, and movement of the axle connects the pin with the crosshead, lifting the roller clear of the cam.
the engine crankshaft and turns it at sufficient speed to cause ignition of the infected fuel. The three purls of u hydraulic starter are connected together toy pipework to a hydraulic fluid reservoir.
Emergency electrical generators driven by diesel engines are usually started by electrical starters, powered by a starter battery of the pattern used in auto¬motive practice. The starter is actuated by a voltage drop in the ship’s d.c. supply, or in ships with a.c. electrical power by a reduction in the frequency.
High-speed diesel generators with engines of the automotive type may have similar starting arrangements to emergency diesel-generating sets. In some cases an air turbine may be used instead of the electrical starter motor. Medium-speed diesel generator sets are usually started with direct compressed air supply through a starting air system. The air flows into the cylinders during the firing or expansion stroke in four-stroke cycle engines, or during the expansion portion of the stroke in two-stroke cycle engines. The air flowing into the cylinders sets the engine in motion and brings its speed up so that it is sufficient to promote combustion when the engine is put on to fuel.
Medium- and slow-speed propulsion engines are invariably started with compressed air through the starting air system.
By: Dimitros
on Sept. 30, 2016, 10:53 a.m.

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