D17 Injection pump removal help???

These are Dr. Allis instructions and I just recently used them, however, I used them on a 190XT so there might be some variation. D17 appears to be a Roosa which is what I had. I also found I had to remove my oil lines and I used a hinged, ratchet box wrench to remove the back side of the fuel lines and to retighten. Make sure you keep track of your washers as they are easy to lose when reinstalling the pump.

Getting the injection pump back in "time" is very easy, if you follow these directions.

There are two studs with 3/8" nuts that attach the pump to the engines front plate.

Make a light chisel mark or scribe a line on the mounting flange of the pump and the engine front plate.

This mark will insure that you know EXACTLY where the injection pump was positioned before you removed it.

The pump body can be rotated on these two studs for small timing corrections...MARK IT, TO KNOW WHERE IT IS.

Once you have done this, you can remove the timing window to drain the fuel,
disconnect all the linkage and the six banjo connection bolts and fuel supply and return lines.

The injector lines and their rubber clamps will need to be loosened ( or removed) to be able to spread the lines apart
from the pump to allow the pump to be pulled rearward about 3 inches.

There is one large engine oil line that may have to be removed to gain more room and will need two new rubber sleeves on it when reassembling.

Pull the pump to the rear and tip it out and there you have it. Now, notice the end of the pumps driving shaft.

It has a flat driving tang. On one side there is a "dot".

Look inside the pump and see the drive socket.....there is also a "dot".
When reassembling, you have two things to make happen.........
"dot" to "dot" on the drive shaft and drive socket and "scribe line to scribe line" on the pump mounting studs.

That puts it exactly back where is has been for the last 20 or 30 years.
If you choose to get a different pump, this method doesn't work very well.
Don't use a felt tip pen...SCRIBE THE MARKS.

Personally, I never remove the large engine oil line, I remove the end cap of the injection pump to gain more clearance,
and also remove it and replace it when re-installing the pump.

I do my own pump repair work, so this is no big deal.

Clean, clean, clean is the word of the day.

When reassembling, get the pump mounted with the 3/8" stud nuts left slightly loose, so the pump can rotate back and forth.

Get all six of the injector line banjo bolts started back in their respective holes and just snug,
and then correctly rotate and position the pump and tighten the 3/8" nuts.

Be very careful to not roll the rubber seal lip when installing the pump.

Use light penetrating oil on the seal and pump bushing and
tuck the rubber seal into place with a cotter pin puller or a strategically shaped piece of coat hanger wire that is not sharp on the end.

Have fun !!!
 

Like Mack said above, plus while pump is off being serviced, make sure engine does not get turned. Upon re-installation, the proper timing can be set at that time. Could have been a degree or 2 off over the years as the gears and shaft wears. Good luck!

Well I just pulled my pump before I read this and didn't line up any timing marks before I pulled it. How screwed am I?

Dot-to-dot on the driveshaft tang and the pumps drive socket. Make note of where the flat washers made marks on the pump mounting flange slots and place them in the exact same spot. It will run fine.

Edited by DrAllis - 02 Sep 2024 at 9:48pm

One thing I would add is that the pump will come back from the rebuilder with the throttle wired to the wide-open position. Don't remove the wire until the pump is installed on the engine.

AC720Man wrote: Those previous post were from 2017.

Injection pump Ed can fix you up. Those pumps do require knowledge but also some special tooling to tear down and reassemble.

Thanks for the plugs guys, you're right on, he said himself he is not a mechanic. That right there tells you to leave it to a professional. The removal and re-installation can be performed by someone with basic mechanical skills. Rebuilding the pump however does require much more skill and experience. I've seen many problems from do-it-yourself jobs gone wrong.