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Old 01-07-2010, 06:13 PM
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Cheap Injector O Rings - Failure

I replaced the injector o rings on my 1997 F250 7.3L two years ago when I bought the truck. The injector cups were cracked and since I had the injectors out I had to replace the seals. I bought the injector o-ring service kit from Napa. It came with all the seals to service two injectors. Everything was fine until a month ago. I started going through oil like crazy. 8 quarts in 10 miles. Something was wrong.

I opened the fuel filter and it was covered in oil. I knew the injector seals were bad, so I pulled them out. When I got the injectors out most of the o rings had shrunk and were very brittle. A few o rings were torn with pieces hanging off of them.

I replaced the old seals with ones from Ford. They were more expensive than the ones from Napa, but the quality was much better. I really regret not getting the seals from Ford in the first place, but I figured the Napa ones would be of good quality. I guess you get what you pay for. It would have saved me a lot of aggravation in terms of having to do a job twice.

Since the first time I did the seals, I have heard of a few other people say to stay away from aftermarket injector seals because of premature failure. Maybe this will help someone out, I'm not saying this will definitely happen, but I would not want to do this job again. For reference the Napa rings only lasted about 3000 miles. The truck has just over 165K right now.
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Old 01-07-2010, 06:39 PM
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wow, thanks for the heads up. I just replaced mine. they were starting to show signs of wear, but i didnt have enormous oil consumption. atleast it was a easy fix for ya
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Old 01-08-2010, 07:12 AM
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thanks for the info!
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Old 01-08-2010, 12:20 PM
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i bought mine from and Internatial dealer like 16 bucks a piece.
Didnt want to mess things up.
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Old 01-08-2010, 12:23 PM
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how hard in injector cups to replace and how do you know if they are bad?
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Old 01-08-2010, 12:32 PM
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Quote:
Originally Posted by jethro View Post
how hard in injector cups to replace and how do you know if they are bad?
not fun at all to replace.........you'd have oil in your coolant
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Old 01-08-2010, 12:42 PM
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I have 200k on my 03, I have to swap some glowplugs, is it worth doing the orings while im under there?
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Old 01-08-2010, 12:45 PM
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ok so orings will cause it to burn oil not the cups?
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Old 01-08-2010, 12:46 PM
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Quote:
Originally Posted by Griff350 View Post
I have 200k on my 03, I have to swap some glowplugs, is it worth doing the orings while im under there?
is everything stock? if so then i might if you have the scratch to do it
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Old 01-08-2010, 01:49 PM
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all stock except for a 50hp diablo chip. Runs like new.
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