Originally Posted by MC333

Thanks a ton man - that is a great writeup. And the pictures are perfect.

Quick question - if installing the injectors does not put much oil into the cylinders itself (correct me if I'm wrong here) could you purge oil with both the injectors out and glow plugs out to minimize the amount of oil going into the cylinder head?

If installing the injectors gets a lot of oil into the cylinder itself, then ignore this question

Looking to get this done this weekend assuming my new GPs arrive in time. Will tell ya how it goes.

Originally Posted by JonathanN

Nope, you can't suck it because the glow plug holes as well as the holes in the injector bores are too small. There's no junk that come out, or at least there shouldn't be... I'd imagine you'd have some serious issues before you pulled the injectors if you had issues. That's why I pulled the glow plugs and turned over the motor... a healthy 7.3L will build 350-400psi of compression. With the glow plugs removed, it's still a small hole. It blows it out VERY well and I've had no issues yet. Everyone I know who does this on a regular basis does is this way as well. Plus, it's alot easier than trying to suck oil out IMO.

I think I'll probably do a full writeup when I have the time to sit down... on the OBS trucks, it's pretty easy because you don't have as much to remove on the top end as you do on the Super Duties. I think you pull the intake and tubes off and shove a few wires around, but that's it. 13mm bolts for the valve covers and you're in. Tie-down bolts are 8mm and glow plugs are 10mm. Have to use a 1/4-drive deep socket for that. There's a trick... if you screw the glow plug all the way out, it'll get stuck inside the socket and bind when you try to pull it out. What you have to do is leave the plug screwed in 1 or 2 turns so you can get your socket out, then finger the glow plug out.

Oh... haha, and watch out that you put the glow plug in it's hole. I've missed it and dropped it in the push rod slots before. I was lucky, but that would NOT have been funny! Oh, and I'm gonna edit my post, but it's important to properly torque everything before you put it together.

Originally Posted by MC333

Thanks a ton man - that is a great writeup. And the pictures are perfect.

Quick question - if installing the injectors does not put much oil into the cylinders itself (correct me if I'm wrong here) could you purge oil with both the injectors out and glow plugs out to minimize the amount of oil going into the cylinder head?

If installing the injectors gets a lot of oil into the cylinder itself, then ignore this question

Looking to get this done this weekend assuming my new GPs arrive in time. Will tell ya how it goes.

Originally Posted by JonathanN

Man, I have tried that and I could never get it to work. It would work one time and then there'd be oil in the end and the hose would spin. Guess I need to try it again...?

Originally Posted by Talyn

Went and found my thread.

and pulled #1 and #2 relay, and 22 and 9 fuses.

They all have to do with the ignition system, so I went for overkill.

Originally Posted by Talyn

I usually stuff a hunk of paper towel on the end of the GP and smash it on there, then smash the other end into the drill and drill them in.

3 times outa 10 it works.


I've even tried melting hoses and tubes to fit tight on the GP's.

Originally Posted by JonathanN

On the OBS trucks, it's pretty tight on #5 and #7, especially #7... I've found it helps to remove the vacuum reservoir from the side of the heater box. Gives you just a little more room for your mallet. If I'm right, you can't get the injector out without removing it either, but I could be wrong.