1/19/2023 0 Comments Starter 5.6.2.9.![]() Unfortunatly, tests for the fuel system assumes the engine will start. With the exception of the glow plug circuit and batteries/starter system, these things are also going to affect performance as well. There are basic things that need to be checked: power to the glow plugs fuel delviery to the injection pump air, exhaust and fuel return restriction battery condition and starter draw/speed compression fuel quality/contamination or air intrusion and fuel delivery to the injectors. As you crank the engine, if it sounds like it is trying to start, tighten the injector lines. Sometimes it may be necessary to loosen some injector lines and hook up a battery charger if excessive air has gotten into the system. Only allow the engine to crank for 30 seconds or starter damage can occur. But if it stalls, disable the glow plug system (to keep from burning out the plugs) by disconnecting the relay ignition wire, run a jumper from any positive battery source to the cold start solenoid and try to purge the air by cranking the engine. Sometimes you can keep it running long enough by "feathering" the accelerator pedal to purge the air from the system. ![]() Since the engine has been warmed up, it will start, but it is going to stall. ![]() If I don't have enough fuel to fill the filter, I top it off with some ATF. Use clean diesel fuel, but if you don't have any on hand, you can save the fuel dumped from the old filter in a clean container and strain it before putting it back into the new filter. Before installing the filter on the header, I refill it to make starting easier. Changine the filter is just like changing an oil filter-you lube the new gasket(s) with clean engine oil and hand-tighten only. If the Fuel filter header can be removed from the bracket, I do this because it reduces the amount of fuel spilled on the engine. When ever I replace a fuel filter on a diesel, I try to do it with the engine already warmed up to aid in starting and to ensure that oil is distributed throughout the engine. Hydraulic pressure can't build, so the injector won't open. As the fuel is injected into the cylinder, the fuel pressure drops and the internal spring re-seates the pintel.Īir inside the fuel lines compresses and this is what causes so many performance and no-start problems. When the fuel pressure in the injectors gets above 1400 psi (new injectors typically open at 1700 psi), it overcomes the spring inside the injector and the valve (pintel) rises off its seat allowing the pressurized fuel to spray from the nozzel. From the transfer pump the fuel is sent to a plunger-type intensifier pump which increases the fuel pressure further and sends it through the shaft and distributor rotor to each individual injector line, depending on shaft position. It does this by pressurizing the fuel in the injector lines. ![]() The injection pump hydraulic head not only distributes the fuel to each injector, but also opens the injectors. Excess fuel passes through a bleed into the governer housing where it is used to lubricate and cool the mechanical portion of the injection pump before returning to the fuel tank. The injection pump also contains a transfer pump which increases the fuel pressure inside the hydraulic head to 60-120 PSI. If the engine speed decreases for a given throttle setting, the governor increases the amount of fuel to maintain the desired RPM. The accelerator linkage basically changes the minimum governed engine speed (RPM). The injection pump contains a governor which contols the amount of fuel delivered to the injectors. Fuel is delivered to the injection pump from the tank(s) by a mechanical lift pump. These engines use what is called a hydraulic injection system. In the case of a glow plug system problem, plugging the block heater in for a couple of hours usually will get the engine warm enough to start.Ī word of caution about ether or starting fluids: a hot glow plug can ignite starting fluid before you have a chance to crank over the engine and will cause internal damage. The most common problems with the old IDI engines is hard/no start or stall after starting, so that will comprise the bulk of the tips section. Vehicle service information can be found at my Service Page, and much of what is posted at my PowerStroke Page can be applied to these engines as well.Ĭlick here if you're looking for IDI Parts. Hopefully the information posted here will be of some use to you. This page is for those of you who own or work on the older Ford/Navistar diesel engines. ![]()
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