OK guys I'm at wits

end! This morn we took the plastic screens outta the gascolaters, cleaned and resealed. I made a plywood 'fuel cap' with a cork gasket to set over filler neck. It has a hole drilled through to accept my rubber tip airgun. I pressurized a psi or 2 and checked every conection with a soapy water spray bottle. Still surged. We took apart every single connection on the feed line from tank to pump and resealed. On 2 ends we actually cut the pipe and reflared. Still surging. We then hooked a new hose from a 5 gal container of diesel up to the primer inlet and primed. It was a clear hose. Bled all. Ran it for 15 mins; surging at every power setting. No change at all. Hooked back to original line. Ran it with the fuel tank under some pressure, no change still surging. While running at 1000 rpm's it surges to 1200, then back. If I hold my hand over the air intake and choke the inlet it starts laboring and the surge about goes away; pull my hand off and the surging returns. I am out of ideas. I spoke with the pump rebuilder and he says he'll look at the pump again but I hate to jump to conclusions. What would y'all do next? Thanks, Dana

I question if the WIX filter is correct? WIX 33354. I question the pipe plug on top of the filter to bleed; is that what it's supposed to have? I just thought.. I will go up and unhook pipe feeding pump at pump and pressurize backwards to the primer and plug the primer inlet to prove that section isn't leaking. Can I hurt anything [pump] by pressurizing inlet of hand primer and leaving pump inlet pipe attached to pump?



Edited by captaindana - 13 Mar 2012 at 4:59pm

Another thought. Can I take out the fitting that screws into the pumps inlet? Doesn't it have a screen on it?

Pump rebuilt, injectors new. Repulled and checked one injector it was spot on.

Hi Rob I took that apart also. It seems fine, primes like crazy. I mean if you pump it like there's no tomorrow then yeah you can make fuel leak out of it, or if you pump till its hard and then shove it in to lock you could squirt some fuel out. But I had that in every position while running and it seems as in new condition to me but maybe???

Edited by captaindana - 13 Mar 2012 at 6:23pm

Don I have run it for hours fiddlin with the shut off lever no changes till you get it almost all the way to cut off then she cuts off. I'm baffled still. I won't incinerate her yet. Close but not yet lol.

captaindana wrote: e While running at 1000 rpm's it surges to 1200, then back. If I hold my hand over the air intake and choke the inlet it starts laboring and the surge about goes away; pull my hand off and the surging returns.

Hmmm...

that's very strange.

Have you done anything to the engine... rings... pistons... sleeves... head?

How's the oil level been? is it loosing, or gaining any?  Does it smell 'diesely'...

I'll admit that I've NEVER worked on an Allis diesel... I have worked on a few really small diesels, and some medium-sized in industrial scenarios, but most of my experience comes from teaching some locomotive fuel-control systems.

Aside from the governor in your pump having some sort of problem, the only other thing that comes to mind, is that something OUTSIDE the program, is somehow offsetting what SHOULD be proper fueling.  Is the TIMING adjustable on the injection pump?  If so, is it possible on a D17D for the timing to be accidentally set advanced or retarded?

I AM IN AGREEMENT WITH SKIPWELTE,YOU ARE CHASING AN INJECTION PUMP ISSUE.GET THE PUMP AND INJECTORS RUN AGAIN.....

You said if you cracked #5 line it went away correct?  Try switching injectors and see if it follows the injector, its worth a shot.  Also, I don't have any thing with a 301 but what do they use for return lines?  If they are rubber between each injector replace them.  If you have not replaced any rubber parts of any of the fuel lines do so. 

Another thing you need to do is find a way to work it hard, and get it hot.  Sitting 27 years it needs the carbon burnt out of the valves and rings. 


Edited by Jordan(OH) - 14 Mar 2012 at 1:05am

Dana there are alot of good suggestions here.....but I am afraid to say that I think the pump is going to have to come back off and go back to the rebuilder.