article will hopefully give you some insight on how to adjust your fuel
injection pump on 88-93 7.3L Non-Powerstroke, IDI. This will
probably work the same way on a 6.9L Navistar(Ford) engine as well.
start off, I would recommend putting in a pyrometer gauge before doing
any kind of performance upgrades. I would also make sure that you clean
the area that you will be working. We are going to be opening a side
door on the Injector Pump and we DONT want dirt going inside.
not going to say how much you should turn the adjuster, as I'm not a
mechanic and I dont know for sure. I wouldnt go more than a 1/4 turn at
a time without seeing how my truck deals with it, and what my pyrometer
does going up hills. Lets get started!
The tools you will need:
- 5/32 Allen Wrench with at least 3" of span in each direction.
- 15/16 Deep Socket, or a regular with an extension.
- Long handled socket wrench
- Flashlight (can come in handy)
off, here is what we are looking for. The first pic is from the top of
the injector pump, the second is from the left of that big hose that
looks like it will be in the way.
of the big radiator hose that you see in the second picture, the
first time I did this, I removed it to make it easier to get
in there. I wont do that again. You can if you want,
but I warn you, it was quite messy. Lots of radiator fluid everywhere.
thing to do is take off the top bolt on the cover with the 1/4" socket,
then loosen the bottom bolt. Now slide the cover over, if you only
loosen the bottom bolt, it will slide but not fall off. Dont be
surprised if a little bit of fue guzzles out at the beginning.
if you look from the side, or use a mirror, you should be able to see
something like the picture below. If you look carefully, you will see
deeper hole in the left notch of the area you just opened up. If you
look in that deeper hole, you might see the Allen nut that you need to
adjust, if you cannot see this, it is possible that you will have to
turn your bellhousing until it shows up.
adjust turn your bellhousing, put your truck in neutral(make sure your
emergency brake is on and your wheels are blocked). Grab your 15/16"
deep socket and long ratchet and head under the front of your truck.
Just behind your fan area, you should see something like the picture
below. Turn the center nut inside the bellhousing there, until the
Allen Nut on the injector pump shows up.
the Allen Nut in the injector pump shows up, use your 5/32" Allen
Wrench and turn the nut clockwise, I only recommend a quarter turn. Go
ahead and put the cover back on the injector pump. Make sure you did
not leave your ratchet and socket still connected to your bellhousing.
Clean up all your tools and fire your truck up!
may have to play with this a couple of times to get the desired results
that you want. I have mine set to where it has just enough power, but
lets out huge plumes of black smoke if I start out in a high gear.
I hope this little tutorial was helpful.