Fuel injector o ring
 

I have a 1989 E350 7.3 l diesel. I am cleaning the fuel injectors. is there supposed to be an o-ring at the tip of the injector behind the copper washer? The part number on the tip is c a v 6 8 0 1 0 3 6. Thanks!

Nope, just the copper washer

How do you keep the washer in place when installing? The hole on the washer is bigger than the nozzle.

Just drop it in the hole and move it around with a screw driver if it doesn't fall flat, most of the time they do.

Be sure to clean any soot out of the holes to ensure a good seal. It's not easy but a pick, rag with a screwdriver and a shopvac reduced to a small hose are my go to.

I think one guy on here uses a shotgun brush from a gun cleaning kit, not a bad idea.

I've used bore brushes. You can get a nice kit at Harbor Freight on the cheap. You can also use hi-temp grease to make the copper washer stick to the injector so you can install them together.

https://www.harborfreight.com/engine...-pc-63732.html

NOTE: Well darn don`t know what that link crap is. Copied a picture of the Reamer.
Click on the link and it takes you to Google and the picture.
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Here is what the official Ford tool looks like. Tool Source use to have it.
But in the $300 range. Way over priced for what it is.

As mentioned, E-bay would be the best place to come across a used one.

Charlie