Do Injectors age-out? - Diesel Forum - TheDieselStop.com
6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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post #1 of 33 (permalink) Old 10-05-2018, 06:43 PM Thread Starter
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Do Injectors age-out?

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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post #2 of 33 (permalink) Old 10-05-2018, 07:16 PM
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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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post #3 of 33 (permalink) Old 10-05-2018, 07:20 PM
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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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post #4 of 33 (permalink) Old 10-06-2018, 07:22 AM
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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.

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post #5 of 33 (permalink) Old 10-06-2018, 08:50 AM Thread Starter
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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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post #6 of 33 (permalink) Old 10-06-2018, 09:19 AM
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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.
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..."
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post #7 of 33 (permalink) Old 10-07-2018, 04:52 PM Thread Starter
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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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post #8 of 33 (permalink) Old 10-07-2018, 06:28 PM
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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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post #9 of 33 (permalink) Old 10-08-2018, 12:23 AM Thread Starter
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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.
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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post #10 of 33 (permalink) Old 10-10-2018, 01:31 PM
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I used Brakecleen followed by compressed air. Careful of your eyes when doing it.

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post #11 of 33 (permalink) Old 10-10-2018, 01:34 PM
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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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post #12 of 33 (permalink) Old 10-10-2018, 02:31 PM Thread Starter
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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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post #13 of 33 (permalink) Old 10-10-2018, 06:26 PM
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Cleaning Out the hold down bolt hole....

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post #14 of 33 (permalink) Old 10-10-2018, 08:25 PM
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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...

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post #15 of 33 (permalink) Old 10-11-2018, 05:36 PM Thread Starter
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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
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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