EMD_DRIVER
Say what?!?!
You can also hook a scanner to the OBDII port and look at the ICP reading...
New 1995 F-250 Powerstroke
- Thread starter Kevin 007
- Start date
You can also hook a scanner to the OBDII port and look at the ICP reading...
Hydraulically-actuated, Electronically-controlled Unit Injectors (or HEUI injectors for short) will have a tremendous impact for the good, or not so good, for the foreseeable future.
PowerStroke diesel and Caterpillar powered RV vehicles depend on HEUI systems to deliver the fuel and make these engines run. The HEUI design uses a second high-pressure oil pump and delivers a constant flow of very high-pressure motor oil to gallery passages in each cylinder head. (Pressures between 500 and 3000 psi) When the electric solenoid on top of a HEUI injector is actuated, this high pressure oil is directed into a chamber inside the injector and provides the hydraulic pressure to force an intensifier piston to move downward. The intensifier piston in turn pushes fuel out into the cylinder. Fuel is injected into the cylinder at pressures as high as 21,000 pounds per square inch.
The technology described here is really quite amazing. It permits fuel control that is so precise that, combined with the rest of the system, cylinder performance can be monitored and instructions to each injector modified to make a smooth running engine even when other mechanical factors would make other engines run rough.
Priced in the neighborhood of $300 per injector, a set of 8 injectors along with the labor to change them can cost more than we used to pay for a complete engine 15 years ago. These injectors depend totally on clean oil of high quality, clean fuel and fuel with enough lubrication ability to make pumps and nozzles have a long, dependable service life.
PowerStroke engines pump unfiltered oil from the sump to the high-pressure oil pump and then to the injectors. This means that to not change oil or to do anything that contributes to accumulation of dirt in the engine will subject your expensive injectors to wear and potential damage as particles suspended in the oil get forced into the injectors.
Because the injection system uses unfiltered oil directly from the pan , it makes total sense to use the very best synthetic motor oil after break-in. High quality synthetic lubricants can tolerate much higher temperatures without coking or breaking down. The best synthetic oils also keep the engine clean by being able to dissolve deposits and keep them safely in suspension to be filtered out or removed at drain time. It is a good idea to install a bypass oil filter on these engines. A fine bypass filter slowly filters the oil to remove particles as small as 2 microns. The full flow filter lets particles below 20 to 30 microns stay in the oil. It is the particles between 5 and 30 microns that are responsible for most of the wear on HEUI injectors and engines. Adding bypass oil filtration, in addition to the normal full flow oil filter, will get rid of these small particles, which would otherwise accumulate in the motor oil to become the cause of wear and failures.
Oil is important to HEUI systems but fuel is equally important. The lower section of a HEUI injector is lubricated by fuel. Dirty fuel means injector wear. Changes in our fuel to help the environment have resulted in the fuel we buy being a poor lubricant compared to the fuel of 10 years ago. You need to use a top quality fuel additive in every tank of fuel if you want to get the best life out of your HEUI fuel system components. You also need to stay on top of fuel filter maintenance. Make very sure to use only filters from Raycor, Parker, Ford or Navistar, as there are inferior filters available that suffer from torn seals and let dirt into your injection system.
Another fact about HEUI injectors is that they rely on o-rings to keep fuel and oil from mixing or escaping from their proper flow paths and causing performance problems or engine damage. HEUI injectors use 5 o-rings. The 3 external ones have been the subject of a great deal of trouble and do need to be replaced with updated o-rings if they fail. The 2 internal o-rings are not field replaceable. If these fail then the injector or injectors must be replaced. While HEUI systems are inherently reliable if properly maintained they present some diagnostic challenges when injector hydraulics are not working properly. It is often possible to tell which head has a pressure leak but the only way to prove the cause of the leak is a process of elimination. You can change the external o-rings and see if this fixes the symptom. If external o-rings do not fix the symptom then you either have an internal o-ring problem or a leak in the head itself, like a casting crack. You prove which cause is at fault by replacing the injectors in question. If this doesn’t fix the symptom then you have a bad head or heads.
The most common symptoms of injector o-ring trouble are oil getting in the fuel, the fuel filter element turning black, long cranking times before starting, sluggish performance and reduction in power. Increased oil consumption often accompanies oring problems or any fault that lets fuel in the oil.
Any money that was saved by ignoring or neglecting needed maintenance on lower mileage vehicles comes no where near being worth the pain of parting with thousands of dollars for fuel system repairs that could have been avoided.
PowerStroke diesel and Caterpillar powered RV vehicles depend on HEUI systems to deliver the fuel and make these engines run. The HEUI design uses a second high-pressure oil pump and delivers a constant flow of very high-pressure motor oil to gallery passages in each cylinder head. (Pressures between 500 and 3000 psi) When the electric solenoid on top of a HEUI injector is actuated, this high pressure oil is directed into a chamber inside the injector and provides the hydraulic pressure to force an intensifier piston to move downward. The intensifier piston in turn pushes fuel out into the cylinder. Fuel is injected into the cylinder at pressures as high as 21,000 pounds per square inch.
The technology described here is really quite amazing. It permits fuel control that is so precise that, combined with the rest of the system, cylinder performance can be monitored and instructions to each injector modified to make a smooth running engine even when other mechanical factors would make other engines run rough.
Priced in the neighborhood of $300 per injector, a set of 8 injectors along with the labor to change them can cost more than we used to pay for a complete engine 15 years ago. These injectors depend totally on clean oil of high quality, clean fuel and fuel with enough lubrication ability to make pumps and nozzles have a long, dependable service life.
PowerStroke engines pump unfiltered oil from the sump to the high-pressure oil pump and then to the injectors. This means that to not change oil or to do anything that contributes to accumulation of dirt in the engine will subject your expensive injectors to wear and potential damage as particles suspended in the oil get forced into the injectors.
Because the injection system uses unfiltered oil directly from the pan , it makes total sense to use the very best synthetic motor oil after break-in. High quality synthetic lubricants can tolerate much higher temperatures without coking or breaking down. The best synthetic oils also keep the engine clean by being able to dissolve deposits and keep them safely in suspension to be filtered out or removed at drain time. It is a good idea to install a bypass oil filter on these engines. A fine bypass filter slowly filters the oil to remove particles as small as 2 microns. The full flow filter lets particles below 20 to 30 microns stay in the oil. It is the particles between 5 and 30 microns that are responsible for most of the wear on HEUI injectors and engines. Adding bypass oil filtration, in addition to the normal full flow oil filter, will get rid of these small particles, which would otherwise accumulate in the motor oil to become the cause of wear and failures.
Oil is important to HEUI systems but fuel is equally important. The lower section of a HEUI injector is lubricated by fuel. Dirty fuel means injector wear. Changes in our fuel to help the environment have resulted in the fuel we buy being a poor lubricant compared to the fuel of 10 years ago. You need to use a top quality fuel additive in every tank of fuel if you want to get the best life out of your HEUI fuel system components. You also need to stay on top of fuel filter maintenance. Make very sure to use only filters from Raycor, Parker, Ford or Navistar, as there are inferior filters available that suffer from torn seals and let dirt into your injection system.
Another fact about HEUI injectors is that they rely on o-rings to keep fuel and oil from mixing or escaping from their proper flow paths and causing performance problems or engine damage. HEUI injectors use 5 o-rings. The 3 external ones have been the subject of a great deal of trouble and do need to be replaced with updated o-rings if they fail. The 2 internal o-rings are not field replaceable. If these fail then the injector or injectors must be replaced. While HEUI systems are inherently reliable if properly maintained they present some diagnostic challenges when injector hydraulics are not working properly. It is often possible to tell which head has a pressure leak but the only way to prove the cause of the leak is a process of elimination. You can change the external o-rings and see if this fixes the symptom. If external o-rings do not fix the symptom then you either have an internal o-ring problem or a leak in the head itself, like a casting crack. You prove which cause is at fault by replacing the injectors in question. If this doesn’t fix the symptom then you have a bad head or heads.
The most common symptoms of injector o-ring trouble are oil getting in the fuel, the fuel filter element turning black, long cranking times before starting, sluggish performance and reduction in power. Increased oil consumption often accompanies oring problems or any fault that lets fuel in the oil.
Any money that was saved by ignoring or neglecting needed maintenance on lower mileage vehicles comes no where near being worth the pain of parting with thousands of dollars for fuel system repairs that could have been avoided.
Kevin 007
Full-floater
WOW Rich. Best write up I have seen on this website...ever!
Thanks for taking the time to describe with such clarity on how this system works. I have a much better understanding of it now and im sure others will to.
So is synthetic oil what you run in your stroke? Do you have a bypass filter?
Thanks for taking the time to describe with such clarity on how this system works. I have a much better understanding of it now and im sure others will to.
So is synthetic oil what you run in your stroke? Do you have a bypass filter?
i didnt write it.copy and paste.cant link to the site it originally cam from,goes to a blank page.
no i run straight rotella dino oil.dont trust synthetic.grew up around big rigs and all we used was rotella t 15/40.no bypass filter.that part is all stock still.
no i run straight rotella dino oil.dont trust synthetic.grew up around big rigs and all we used was rotella t 15/40.no bypass filter.that part is all stock still.
heres some reading about the burnt truck caused by a hydraulic hose.
http://www.thedieselstop.com/forums/f29/gen3-hpop-beware-117424/
if hydraulic hose was better i dont think the manufacturer of the stealth hpop would recomend and sell the stock hoses for use on hpops that are capable of well over 6000psi.
http://www.thedieselstop.com/forums/f29/gen3-hpop-beware-117424/
if hydraulic hose was better i dont think the manufacturer of the stealth hpop would recomend and sell the stock hoses for use on hpops that are capable of well over 6000psi.
Kevin 007
Full-floater
So an oil change every 3000miles or so is fair?
And as for that cam position sensor, are there any ways to test and see if it is indeed the sensor that is at fault if the truck won't start. Thats testing without a code reader.
I will be lending the truck to my father for a few weeks and I want to inform him of this potential trouble maker, I will leave him a spare in the glove box that he can through in if need be. Once it is replaced, will the truck fire right up as normal?
Any other sensors that I should know about?
And as for that cam position sensor, are there any ways to test and see if it is indeed the sensor that is at fault if the truck won't start. Thats testing without a code reader.
I will be lending the truck to my father for a few weeks and I want to inform him of this potential trouble maker, I will leave him a spare in the glove box that he can through in if need be. Once it is replaced, will the truck fire right up as normal?
Any other sensors that I should know about?
coulda been avoided if some research was done.if it were my truck i woulda showed up at swamps door with a bat,forget the phone calls and bein nice.
every 3000 is fine.if you want you can do an oil analysis and go from there.i believe you can go 5000 miles between oil changes.
if the truck wont start.watch the tach and tailpipe.no tach movement/no smoke from pipe is either cps or blown fuse under the hood caused by the fuel heater unless there is a bigger problem.but the cps is the most common reason for a no start.truck will fire up like nothing ever happened after replacing it or the blown fuse if it was 1 of those that caused it.you can replace it now if you wish and keep the old one for a spare.a dying cps will also lower the fuel mileage and power as well.dont get the gray sensor,go to ford or international and get the black OEM sensor.
no more sensors to really worry about till it has a bigger problem.
7.3 powerstrok
Full Access Member
hpop pressure 1995 psd
yea at idle holds at 700 psi under load and throttle spiked up to as high as wow 3500 psi the hydraulic lines im using are rated at 3000 psi 212 deg working pressure and 12000 psi burst pressure they can handle that psi and oil temp constantly 24 hours a day 365 days a year ..so im going to leave them for now and soon upgrade to a 4000psi hydraulic lines for good measure ,,as for youre steath hpop pump dont forget to replace youre high performace oil lines every year as reccamended by the company in my opinion ford factory hpop oil lines should be replaced if more than 5 years old as they are just a thin plastic hose wraped w/ss wire braid and the problem is the plastic wears fatiges against the braid from the constant expand ing and the most prone area to let go is at the crimp collar i reccemend using replacement factory ford hpop oil lines if you get a hydraulic line made its not uncommon for it to leak or have the end blow off because the worker does not know what the hell he is doing however i use speical hydraulic oil lines spicefic to the rated application i know what to use and what not to .i have 245000 miles on my truck now 2 year old ford remand e4od trans and should go another 200000
yea at idle holds at 700 psi under load and throttle spiked up to as high as wow 3500 psi the hydraulic lines im using are rated at 3000 psi 212 deg working pressure and 12000 psi burst pressure they can handle that psi and oil temp constantly 24 hours a day 365 days a year ..so im going to leave them for now and soon upgrade to a 4000psi hydraulic lines for good measure ,,as for youre steath hpop pump dont forget to replace youre high performace oil lines every year as reccamended by the company in my opinion ford factory hpop oil lines should be replaced if more than 5 years old as they are just a thin plastic hose wraped w/ss wire braid and the problem is the plastic wears fatiges against the braid from the constant expand ing and the most prone area to let go is at the crimp collar i reccemend using replacement factory ford hpop oil lines if you get a hydraulic line made its not uncommon for it to leak or have the end blow off because the worker does not know what the hell he is doing however i use speical hydraulic oil lines spicefic to the rated application i know what to use and what not to .i have 245000 miles on my truck now 2 year old ford remand e4od trans and should go another 200000
you do understand that engine oil effects hose different than hydraulic oil?also runs at a higher temp than hydraulic oil?
hey its your truck,do what ya want.i think my lines are perfectly fine with about 30,000 miles on 5 brand new hoses
hey its your truck,do what ya want.i think my lines are perfectly fine with about 30,000 miles on 5 brand new hoses
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Kevin 007
Full-floater
Is there an electric lift pump on the 7.3 stokes? Is it in the tank?
And if they do have an electric pump....how reliable are they?
And if they do have an electric pump....how reliable are they?
h2odrx
Anti-O
95 no 99 and up yes!
Kevin 007
Full-floater
So what kind of lift pump does my 95 have? and where is is?
Thanks
Thanks
Double-S-Diesel
parts seller
mechanical, burried deep in the valley
