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The fuel injection arrangement shown below is for a large two stroke marine diesel engine used on ships In some of the cases, the oil leakage was related to cracks in the union nipple that fastens the fuel oil pipe to the fuel booster/pump High pressure fuel from the fuel pump is led through a double skinned pipe to a distribution block close to the cylinder head and then through three double skinned pipes to the equally spaced fuel injectors fitted in the cylinder cover
The fuel fuel injectors are located by studs or dowel. The pipes which are attached to, and carry return fuel from, the injectors on diesel engines) must be made from metallic pipe or fire resistant hose Never experienced or seen such a failure on any marine or land based diesel from 6bhp to 1800bhp
I suspect the failure was most likely due to damage to the pipe during engine installation in the boat.
The diesel fuel injector's role is to inject an atomised, spray of fuel into the engine Leak off pipes this is one of the quickest and cheapest fixes you can do The leak off pipes link the injectors to a spill rail, which takes excess fuel back to the injection pump and then back to the tank They are small braided hoses that can wear over time and can introduce air into the system.
High pressure fuel oil injection piping (1) all external high pressure fuel delivery lines between the high pressure fuel pumps and fuel injectors are to be protected with a jacketed piping system capable of containing fuel from a high pressure line failure The jacketed piping system is to include a means for collection of leakage.
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