AD no start

Matthew · June 21, 2012, 08:12:27 PM

I have a AD dozer that won't start up this year, not pumping fuel I believe. Had the same problem last year and I changed the filters which were awful and after a lot of bleeding and some help from this forum about bleeding at the injectors I got it going and it started well the next few times I started it last year. I shut the fuel off over winter at there was some leakage at the injector pump "Roosemaster" and now I am having problems again. The gasket for the top cover of the pump was poking out and leaking and I couldn't get fuel to come out at the bleed screw on top of the cover. I had to pull the pump as I couldn't get the cover off installed. I pulled the pump, removed the top cover which looks kind of like a small valve cover and made a new gasket for it. I reinstalled the pump, bled the filters and lines but can't get fuel to bleed out at the injectors when I crack the lines. I do have fuel coming out of the bleed screw on top of the injector cover now. Any suggestions? Thanks

Bob · June 21, 2012, 10:10:19 PM

We had a little trouble with our 1650 Oliver this year. I still am not sure how we got it started, just used a little happy gas, and got it. Maybe could the shutoff have gotten bumped inside? Doesn't make sence, but I'm not too familiar with the Roosa master pumps so hopefuly somebody else can help more

Bob

Doug424 · June 22, 2012, 06:06:42 AM

I had one act like that once and found that the delivery valve had stuck inside the pump. This was also a Roosamaster pump, but a later style than the one on an AD. It required the whole pump to be taken apart.

Blake Malkamaki · June 23, 2012, 04:04:13 AM

There are really only two ingredients necessary for a diesel to run: fuel and air, plus compression to ignite the fuel. I would trace the fuel route and see how far it is getting. Is it making it past the delivery pump to the injector pump? If you loosen all the lines at the injectors and crank it over with the throttle wide open, are you getting any fuel coming through at all?

Bob · June 24, 2012, 03:19:25 PM

I had a little trouble bleeding an OC12 one time. Fuel in tank but no fuel even to the hand pump or out of supply line. Ended up it had a loop in the supply line and wouldn't push the air out. I straightened out the line until fuel came out and then it was fine.

Matthew · August 25, 2012, 02:01:27 AM

Well, it has been a while and after have determined that the problem must be internal to the pump. Talked with pump rebuild facility and the tech was helpful but said for this pump the best that really can be done is a tear down, inspection, cleaning and resealing if everything is ok, no new parts left for this old pump. I was able to locate a manual and now have the pump completely apart in my basement. Manual has been great so far. Pump looks to be in pretty good condition considering it's age but had a lot of mud coating all of the parts. I am not sure if it is from the fuel or maybe rust dust that came from the tank and got by the filters? It doesn't appear to be abrasive and I am cleaning it off all of the parts. Pistons were stuck in bores both in the main pressure part of the pump and the transfer pump so I am hoping that is my problem. I hope to get it back together and working. I felt I really didn't have anything to lose just time and I am learning some things. I will let you all know how I make out. Thanks for the input.

Matthew · September 06, 2012, 11:50:08 PM

Well, I got the pump back together, bled it, the filters and at the injectors and it pretty much started right up after a small toot of ether. It is running well. I used it for about an hour today pushing back a large pile of brush. I replaced all of the o-rings in the pump, some of which I had, some I got from the hardware store and one I ordered on line. I made a new gasket for the top cover and left the front seal in place as this had been replaced by the previous owner not so long ago and looked OK. I wouldn't be afraid to go thru another pump if I had a good manual to go by. It seems with the newer pumps you can pick up a sealing kit containing all of the O-rings for not too much. Thanks again for the input.

Blake Malkamaki · September 07, 2012, 01:19:42 AM

Great report! Maybe your experience will take some of the fear of opening up a fuel pump away?