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.