190XT remove reinstall injector pump

My injector pump has needed rebuilt for sometime but I have been putting it off because I wasn't sure about getting it in time correctly putting it back together. I know there is a timing mark under the timing mark cover on the side of injector pump. Is it best to have everything in time before removing the pump? If so how do I go about doing that other than lining up the mark on the pump. I don't know if Allis ever used anything different on the 190xt series III but I have a Roosa Master pump. Any help appreciated. Dale

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 !!!

Thanks DrAllis for the quick precise reply. This is exactly what I needed. I hope to start the tear down this afternoon after I turn some hay. I can tell from your precise answer you know what you are doing. I had been looking to hire a mechanic as I wasn't sure of what I was doing but I don't know of any Allis dealers (or former dealers) here in Oklahoma anymore. I tried a couple independent shops but they weren't interested in my project. I have ordered a few parts from a dealer in Mount Hope, Kansas and that is almost a 2 hour road trip one way from here. I sure wasn't very excited about hauling a tractor that far. I'll let you know how this turns out. Thanks again, Dale

I got the pump back on Tuesday afternoon in about 3 hours. I had my nephew helping as I was worried about getting the fuel lines to the injectors hooked up on the back side of the pump with my arthritic fingers. It was either first timers luck or the great instructions I got from DrAllis or a combination of both but the old tractor is back in the hay field. Many thanks to DrAllis and this forum to get me going again.