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Discussion Starter #1
I've got to open up the passenger side and install a new #7 injector. I replaced #4 not long ago. My Excursion has 165K on the original injectors so I'm wondering of I should just replace the other 6 as well. Is there a shelf life on Injectors?

I know most people are reluctant to change all 8 at one time due to the cost. I may have a fuel pressure issue and will resolve that before I drive the truck on the new injectors.
 

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Yes. Your truck is continually monitoring you for phrases like, “ I got a raise” or, “we have money left over this month.” It will respond appropriately. Seriously though, they wear approximately the same so it makes sense to replace them as a group. The exception would be a non wear related catastrophic failure. Kind of like how you buy tires as a set unless you have a blowout.


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Lol - nice post RT! Got a good chuckle out of it!

I took his post to mean if he bought the injectors now, but didn't install them for awhile (ie the shelf life question).
 

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Yes. Your truck is continually monitoring you for phrases like, “ I got a raise” or, “we have money left over this month.” It will respond appropriately.
Let your truck know that this type of behavior will not be tolerated by purchasing a new truck and parking it next to it. That note comes before hobby truck repairs. :grin2:
 

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Discussion Starter #5
Thanks guys. By shelf life I didn't mean how long they last in the box/uninstalled, I meant life expectancy in the truck. I probably could have made that more clear.

My main question was is 165K miles considered a lot on an original set or do people often get more miles on them?
 

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Let your truck know that this type of behavior will not be tolerated by purchasing a new truck and parking it next to it. That note comes before hobby truck repairs. :grin2:
Wow - you're a lot braver than I am. That would be like bringing home a new girlfriend to meet your wife. I can hear her now - "Ow - my transmission hurts...":crying:
 

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Discussion Starter #7
I saw a video where a guy, as a precaution, replaced the injector hold down clamp/bolts because he was afraid that they had been over-torqued. He said that the bolts are no good after that has happened.

Is that true? The reason I ask is that they seemed a little tighter than 26 ft/lbs when I just removed all 4 from the passenger side. If they were over-torqued then it was my fault but I thought I was careful when I removed, cleaned and re-installed my original injectors a few months ago.
 

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Some people theorize that the head cracking that we occasionally see could be from over torquing of the injector hold down clamps. I am not sure I believe that to be the only reason because we normally see the cracking on the "middle 4" locations (around 3,5 and 1,4 cylinders). Anyway, if it is only "mildly" over-torqued, I wouldn't worry about getting new clamps and bolts.

It is more important to thoroughly clean out the bolt holes and to use a calibrated torque wrench IMO.
 

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Discussion Starter #9
Some people theorize that the head cracking that we occasionally see could be from over torquing of the injector hold down clamps. I am not sure I believe that to be the only reason because we normally see the cracking on the "middle 4" locations (around 3,5 and 1,4 cylinders). Anyway, if it is only "mildly" over-torqued, I wouldn't worry about getting new clamps and bolts.

It is more important to thoroughly clean out the bolt holes and to use a calibrated torque wrench IMO.
Roger that. I'm assuming compressed air is best to blow out any oil in the bolt holes. Also, a little oil drained into the injector cups so I'm hoping I can also use compressed air to blow that clean as well.
 

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I used Brakecleen followed by compressed air. Careful of your eyes when doing it.
 

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I got 175,000 out of my first set. 150k to 200k seems to be their average lifespan.
 

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Discussion Starter #12
Thanks 06. Is the Brakeclean intended to clean up the entire rocker arm box housing area or just to thin out the oil to make it easier to blow out of the injector cup/sleeves and bolt holes?
 

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Cleaning Out the hold down bolt hole....

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Did you purge out/expel all of the oil that leaked in (from the HPO rail) to the cylinder while the injector was out?
Good way to bend/break a lower end part, if you didn't...

~Al
 

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Discussion Starter #15
Did you purge out/expel all of the oil that leaked in (from the HPO rail) to the cylinder while the injector was out?
Good way to bend/break a lower end part, if you didn't...

~Al
Not sure I understand your question. When the oil rail is removed, the injectors are still in place so the oil that drains out couldn't (initially) find its way into the injector sleeves and injector hold down bolt holes. I'm sure that a little oil could and does drain into those cavities once those parts (injectors and hold down bolts) are removed. I know this because I can see a little oil in the bottom of the sleeves.

I've never had the heads out and have never had the opportunity to inspect another 6.0 head up close but don't they have drain back channels so that oil can drain back down into the motor? I remember seeing other posts from guys who had dropped bolts or sockets down that channel and had to get them out.

Are you saying that a lot of oil normally finds its way into the sleeve and then into the cylinder and it needs to be expelled out somehow.

Sorry. I appreciate your comment but want to make sure I understand what your saying exactly.
 

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In the 7.3, the oil rail and the fuel rail are incorporated in the head. When we pull our injectors, fuel and oil pour into the cylinder. If you don't suck it out, then rotate the engine with the glow plugs out, you break things. I'm sure that's what Calico was asking - to make sure you have your cylinders completely clean before you reinstall everything and bend a rod.
 

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Not sure I understand your question. When the oil rail is removed, the injectors are still in place so the oil that drains out couldn't (initially) find its way into the injector sleeves and injector hold down bolt holes. I'm sure that a little oil could and does drain into those cavities once those parts (injectors and hold down bolts) are removed. I know this because I can see a little oil in the bottom of the sleeves.

I've never had the heads out and have never had the opportunity to inspect another 6.0 head up close but don't they have drain back channels so that oil can drain back down into the motor? I remember seeing other posts from guys who had dropped bolts or sockets down that channel and had to get them out.

Are you saying that a lot of oil normally finds its way into the sleeve and then into the cylinder and it needs to be expelled out somehow.

Sorry. I appreciate your comment but want to make sure I understand what your saying exactly.
Lol
My bad...
I'm in 7.3 land. Disregard. ?
 

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Age out - Shelf Life ?

No, they do not get old and wear is absolutely zero sitting on a shelf. These injectors are an electro- mechanical device who's lifespan is determined by RPM cycles and use severity in cycles. Miles is just an arbitrary quantification because there are so many variables. One user hauling a backhoe every single day and every single mile would have one use resultant, another user hauling the same backhoe once a month another, once a year another likely resultant wear and someone hauling nothing but his grandsons big wheel still another use resultant in the same number of miles.

This is something everyone knows so what does a user do? Keeping and replacing injectors together as a set is an obvious way to keep the group assemblies in the same use - cycle lifespan and expect commonality of condition. Buying a diagnostic system like AE and becoming competent with it would allow a user to gather other data that when looked at and applied to different parameters than miles would allow that user to make a better estimate if injector lifespan.

I use hearing loss to quantify how smoothly and quietly my truck runs. Its getting better and better when my hearing aid battery runs down:grin2:
 

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What about the o-rings? I'd expect them to harden with time sitting on a shelf. Not that big a deal for the external ones, but the internal ones would matter.


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Discussion Starter #20
Good comments everyone. To be clear, I wasn't curious about them getting old on the shelf, like a twinkle in a wrapper. I worded it poorly. I meant age-out from use ( i.e. how many miles should I expect from the original set).

I believe that others have answered that for me so I'm in good shape. Thanks.
 
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