Ford and Navistar have had a working relationship for years, with Navistar producing engines for the Ford full-size trucks. The invention of the Power Stroke was a great move, making it the most powerful diesel on the market at the time. Everyone knew the reliability of the previous diesel models, but of course they all wanted more power.
As we discussed earlier, the first 7. With the Power Stroke, Navistar continued this block concept, but replaced the injection pump and lines with a hydraulic pump. This is commonly referred to as the high pressure oil pump HPOP. Navistar moved the injectors from their original location and placed them under the valve covers, replacing them with an electronic style that gave them a better position in the combustion chamber.
The HPOP delivers high pressure oil that is used to activate the injectors. This is where the term HEUI hydraulic electronic unit injectors comes from. In the 7. The HPOP then takes the oil received from the crankcase and pumps it back out under extremely high pressures , psi through hoses that go to top of the right and left side cylinder heads.
The barrel in the cylinder heads is serviceable and can be accessed through these plugs. However, these plugs have O-rings that can leak over a period of time. Keep in mind that the O-ring is not sold separately, it is only available as a new plug assembly. When the high-pressure oil enters the barrel of the cylinder heads there are passages that lead from the barrel to each injector.
The fuel then enters a chamber in each injector. So now the stage is set for fuel to enter the combustion chamber. We have oil that has entered the cylinder head from the HPOP surrounding the injectors in each cylinder bank. We also have fuel that has been supplied to each injector through the fuel galley of the cylinder head via the fuel pump. Now we need to activate the injectors. This information is provided to the PCM from a cam sensor located above the harmonic damper in the front timing cover.
The cam sensor is a hall effect switch that tells the powertrain control module what cylinder is ready for injection. When the electronic injector is energized from the injector driver module an electronic solenoid mounted on the injector opens a poppet valve. High-pressure oil from the HPOP flows into plunger, which moves downward, increasing fuel pressure and opening the nozzle.
Fuel is then injected into the combustion chamber at pressures as high as 18, psi. So, I said all of this to explain one thing. The oil does play a major role in the running of your Power Stroke engine. I have found this seemingly simple explanation to be the main reason for the Power Stroke engine to run rough.
Robert McDonald is owner of Atlantic Engines in Granite Falls, NC, and specializes in high performance diesel and gasoline engines and cylinder heads for street, marine, dirt or drag racing. Features: Justina Reusch, Reusch Diesel. Fuel pressure must maintain or exceed 45 psi at all times, including under wide open throttle WOT. The fuel filter housing on all 6.
Horizontal Fuel Conditioning Module. It funtions as one of two filters to separate water and other contaminants from your fuel. When the PCM decides it is time to release the injector, an electrical signal is sent to the magnetic coil, pulling the spool valve in the opposite direction.
Another common cause of injector failure in the 6. In the end, injector failure is the result. They are the highest quality, most reliable injectors available for the 6. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Sociology Where is the fuel pump located on a f diesel? Ben Davis February 2,
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