no start ADH

[Matthew]

I have a 1956 ADH which I can't get to start and hope that maybe someone could give me some advise. I have had the crawler a few years and done a bit of work to it. It is fairly worn, smokes a bit but has always started for me until now. It appears not to be getting fuel, little or no smoke from stack. Fuel filters hadn't been changes in a long time so I started there. Cleaned out canisters real good, put in new filters, bleed system but no go. It has the Roosemaster pump, pump is full of fuel. I found small bleeder on top of pump and fuel comes out when I removed this. I am thinking something internal in pump stuck in the off, fuel closed position? I removed small valve cover looking top on injector pump hoping I could see something, hard to do with pump on engine and working thru dozer arms. I couldn't get cover off all of the way and after moving some parts inside put it back on, bled and tried to start but no go. I am thinking of pulling pump so that I can work on it on the bench. Any ideas here? Can something stick in the closed or fuel off position? Thanks

[Blake Malkamaki]

Did you bleed the injector lines? Loosen the nuts on the injectors and open the throttle wide, then crank the engine over until there is fuel oil leaking from each injector line. Close them and see if it will start. If it runs, open each injector line one at a time and bleed the air out.

Blake

[killdozer51]

in addition to what blake said if you can get help open the lines and close them while turning the engine over so as to keep as much air out as possible.  it is possible your shut off is stuck.  if there is a knob up by seat follow the cable to the injection pump and have someone move the knob in and out and see if it moves all the way in both directions.  does the engine smoke while cranking?  how did it officially die?  did it shut down on you or did you shut it down and it wouldn't start the next time?  there a possibilty the pump is bad and those are about $1000-$1500 to have rebuilt.  another thing to verify whch is a last resort is give a SMALL shot of either and see if it fires. keep us posted on what you find and i'll try to help as best i can.

james

[Matthew]

No, I haven't tried bleeding the injector lines but will try that next time I am at machine which is about 40 minutes from where I live. Machine did not die, I last used it to push back some brush piles and ran it for about 30-45 minutes and then shut it down. It sat for about a week or two and then wouldn't start. It sat all winter and started up this summer fine. There is no separate shut off for this injector pump just the throttle lever which when pushed forward fully shuts off fuel and kills engine. I am thinking something internal to pump may be sticking but I will try bleeding the injector lines as you suggest. Unfortunately I can't warrant having the pump rebuilt on this tractor so I have to try to get it running as best I can. Thankyou for your help and input.

[Doug424]

I had a similar situation with a Roosa pump.. I eneded up taking the pump apart and the delivery valve was stuck. The valve is in the center of the main pump shaft. As some mentioned above, make sure you aren't getting any fuel to the injector lines first. If you end up taking the pump of, be careful, and extra careful if you take it apart. You'll need a good manual, and take pictures as you disassemble it, it will be a big help.

[Matthew]

Thanks for all of the input guys, I got her running, bleeding the injector lines was the trick. I am not sure what  originally was the problem with the no start, maybe clogged fuel filters or something stuck in the injector pump but in the end after replacing the filters I guess I just wasn't getting all  of the air out. I ran it a bit today and will go back in a few days and try again but I think it will start ok now. I appreciate your help.

[ianoz]

Good to hear Matthew , I would  as i guess others would , see some photos of your machine .

[Bob]

My AD gives me fits at times after I replace fuel filters. Guess maybe it could be a common problem...

[Matthew]

I will upload some pic's of my dozer if I can figure out how. Thanks