Fuel systems explained an overview of fuel systems and how they work. The caterpillar 3126 heui engine introduces a new era of the diesel engine in the bus industry using the medium duty diesel engine. The injection actuation system supplies high pressure oil in order to power heui injectors 7. Request pdf on jan 1, 2006, b e milton and others published further development of the eds, singlefluid heui injection system find, read and cite all the research you need on researchgate. Small engine fuel systems 4 1 2 days 2050 none this course is an indepth study of the caterpillar fuel systems for the 3114, 3116, 31263126be, c9 and 3208 engines. Yes, there is a nut missing but that would not cause an oil leak. Fuel system mui eui heui exhaust gas fuel injection. This means no excess fuel is used to quiet the injection event via pilot injection or build excess incylinder heat for emissions purposes i. In this months basic training we look at mechanical, heui, and commonrail injectors as we give you a proper tutorial on the fuel injectors on your rig. This is what highpressure oil pressure is referred to within the heui injection system bottom number on gauge. Hydraulically actuated electronic unit injection heui fuel systems utilize highly pressurized engine oil to drive plungers pressurizing fuel for injection. The hydraulically actuated electronically controlled unit injectors heui use a high pressure hydraulic pump and engine oil to generate fuel injection pressure, an. Acces pdf electronic fuel injection system diesel engine. The nut is included with a 9x1484 seal kit for the injection actuation pressure control valve.
Advanced technology yields higher performance the heui hydraulically actuated electronically controlled unit. Peak injection pressure can be achieved under acceleration and lug conditions, providing better fuel economy, better response and reduced smoke. Cat heui pump failure page 2 heavy equipment forums. Also, the injection actuation system controls the injection pressure that is produced by the unit injectors by changing the actuation pressure of the oil. The injection pump, the fuel line and the injectors that were used in the engines with. The injection actuation system serves two functions. Troubleshooting the hydraulic electronic unit injection. You get one main injection event per cyclea single shot.
Injection methods injection systems costex tractor parts. I had a heui pump fail on my 2003 mt745 cat challenger at 400hrs, the cause was put down to working on very steep ground. Cat replaced it under warranty and we just ran the engine 5 litres over full after that and have had no more problems so far. The revolutionary heui injector design is critical to the precision, performance, economy and proven reliability of the heui fuel system. Hydraulic electronic unit injection heui this is a short promo of automates automotive training module covering heui the precursor to the common rail diesel engine.
This unique capability means the regulation of injection pressure is completely independent of crankshaft speed. The heui fuel system requires no mechanical adjustment. Heui this is a short promo of automates automotive training module covering heui the precursor to the common rail diesel engine. Heui uses engine oil pressure to power highpressure fuel injection, where usual method of unit injector operation is the engine camshaft. By multiplying the force of the high pressure oil, the heui can produce injection pressures that are very high. Inyector heui pptx maximo daniel ticllasuca sanchez. Heui systems introduction the goal to build diesel engines achieving outstanding fuel economy. The basic engine takes advantage of the 3116s best features and years of experience and combines this with an electronically controlled fuel system, larger displacement, and other new features to produce the 3126.
This is a short promo of automates automotive training module covering heui the precursor to the common rail diesel engine. The heart of the diesel engine is the fuel injection system. Operation of a compression ignition engine with a heui injection system on natural gas with diesel pilot injection 19990522. Also, the injection actuation system controls the injection pressure that is produced by the unit injectors by. This multiplication of pressure is achieved by applying the force of the high pressure oil to a piston. This technicians guide explains the fuel injection system operation and is mainly focused on the electronic unit injector. Pdf hydraulically actuated electronic unit injector. Code references spare parts which make part of star exclusive, though they are not genuine they are interchangeable with genuine ones. Scribd is the worlds largest social reading and publishing site. The oil line from the heui pump to the cylinder head is likely leaking. How a common rail diesel injector works and common failure points engineered diesel we, at engineered diesel, created this video to help. Dual fuel engines employing pilot diesel injection to ignite premixed natural gas provide an opportunity for liquid petroleum fuel replacement and for reduced emissions of oxides of nitrogen.
Troubleshooting the hydraulic electronic unit injection heui fuel system on c7 and c9 engines1250 6,230 views. Caterpillar cat 3406c marine engine parts manual download mkmjnmdhuy. Troubleshooting the hydraulic electronic unit injection heui fuel s. Heui injector the heui injector uses hydraulic energy as opposed to mechanical energy from the. Troubleshooting the hydraulic electronic unit injection heui fuel system on c7 and c9 engines1250. The piston is larger than the plunger by approximately six times. It has the vital function of communicating with the electronic control module ecm and pumping a measured quantity of fuel into each. The unit injection system integrates the injection pump and nozzle into a single module.
Manufacturers reference numbers have only an indicative purpose. A heui injector, however, was never intended to perform multiple injections per combustion cycle. Small engine fuel systems wanderlodge owners group. Theoretical and experimental study of a hydraulically actuated. Operation of a compression ignition engine with a heui. Pdf as a broadcast to attain it is not provided in this website. Until the development of the heui system, pressurization of fuel and injection timing events were controlled mechanically and limited by the fixed geometry of camshaft profiles.
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