XT 190 INJECTOR PUMP TIMING

Edited by tbran - 22 Feb 2017 at 9:16am

First off thanks Guys.. and yes the Tractor ran great,after I over hauled it.but one day while discing ,it started cutting out  and missing..I took off pump,and Local here,who has worked on AC all his live..(Benny Mckinnon) rebuilt it for me..and said it had alot of junk in it..I since then cleaned out tank lines,ect.and new filters..and it would run if used ether,but ran like it was surging.I loosened up the two advanced bolts on the pump and pushed it up as far as permitted..and it was running alot better..that is when i took off front plate,and seen it was one tooth off,best I could tell..So I pulled gear  out some to make it right.but hasnt run since then...and only puts out fuel to a couple of injectors..Benny said he had another rebuilt pump he would trade me.but I want to make sure its all timed this time.thanks

It really isn't as complicated as you think it is. Even though there's different timing specs for XT's based on if the pump has or doesn't have timing advance. Either way, you're looking at 26* for non advance pumps, compared to 24* for pumps with advance. 2* won't make it run as poor as you're saying. Something was put together wrong in the pump I'd guess cam ring is in backward. Good luck!

1.  Broken Pump Shaft is what I found. Forgot to post. Sending pump off to be rebuilt again. been too many years setting. Thanks

So what would have caused this.

Well that's interesting. But better and cheaper fix than tearing the gears out of it I guess. Hopefully replacement parts are plentiful. John m

So Doc, we've had 2 XT's with 500 loaders for years with no complications, so I have to ask. You said a "big loader hanging in the side frames" could have caused this. Is it something to do with the front plate twisting or stress? Or just to much weight?

This one's failure is obviously crappy old fuel. Look how nasty the fuel side of the shaft is. Now, imagine pump parts with millionths of an inch of clearance are supposed to function properly in that environment, this is typically the result. People just continue to try and start them when it obviously doesn't want to pump fuel. If it is properly torn down and cleaned up before starting it, you can usually save them. The head and rotors for these are in stock, at 1300 just for the new head & rotor. I've used up many of my good used ones!

Yea, I sent the pump in to be rebuilt and bought a Pump Shaft. but after a couple weeks waiting. was told pump head was froze up. and would need a new one at $1200.00.... I said no way.. keep the junk pump. Ill find one somewhere. Any way I got one from Willard on AC.com  I had him rebuild it. just got today ! It looks like a new one ! $990.00 to my door, and it came with a shaft and new seals already on the shaft and installed in pump. I didnt have a core. Thats a hell of a price. I took valve cover off. and valves closed on #1 piston and have set around 26 degrees. But not sure if that is right. This tractor is like a 67 model I think.  How do I tell advanced pump from one that is not ?  I need to know for sure what degree before top dead center it should be. Going to take cover off of  pump to allign lines. and put gear on pump and make sure gear aligns with the other crank gear dots. That should be right ? Thanks

Edited by Digit - 25 May 2022 at 10:20pm