szafram

Ah, that makes perfrect sense, thanks! I'm probably going to try the fuel method since the whole pump is still on the truck, and I really dont want to take it all off if I can avoid it. Is it just a rubber seal thats holding it in place then? Mines painted over, so I'll have to get past that part first...Do you know where I can get a replacement seal for one at? Thanks again!!

After today I am positive it isn't the governor. I pulled it off the side to access the shut off shaft, and it moved like butter once I took it off. The shaft however still will not move at all. I can manually move the rack no problem as well, but that shut off shaft is still frozen. I took the snap ring off that holds it in place, hoping I would be able to take the shaft out and clean everything up and regrease it. Not only will the shaft not turn, it is frozen in place and will not come out either. All of the pieces are there and appear to be in good shape, its just stuck and wont move. Ive soaked it in PB blaster a few times, but still no luck. Any thoughts/ideas?

Ron, I had a little more time to play with it, and all the barrels seem to move freely with little or no resistance. I can't find the air cylinder you are talking about on the front of the pump, but I did find this owners manual (http://www.ambac.net/images/model_ape_6bb.pdf) of the one that I have. From the exploded view, part number 56 and number 57 are the ones that are frozen. The front side of the pump (assuming front is the side farthest away from the governor) is completely covered and looks to be hooked into the engine at that point. Any other thoughs on what I can do, or which number on the exploded view is the air cylinder you were refering to? Thanks again for all your help!

Ron, pulled the side panel off, but didn't have a lot of time to move the barrels and such, but I think they should be free as the truck was recently driven. I will try that more tomorrow though, and hopefully that frees it up. In the meantime, here is a link to a picture of the exact pump that I have (http://www.oldengine.org/members/diesel/Injection/AmbacManual13.htm), and #3 is the component that is frozen and won't turn. Should I still keep working the barrels when I get a little more time to try and free that up, or is there a different, possibly more effiecient way to do it? Thanks!

Yea, it has been running recently. I ran it in late October/early November, than on Christmas again, and that is when it froze, while it was still running, and I had to forcefully shut off the valve from inside the engine bay. I will pull the cover off tomorrow and spray some PB blaster on it. I did disconnect the cable (as I had hoped that was all that was stuck), but as soon as I did, the cable moved fine and the valve was still stuck. And I am in Lake County, about and hour/hour and a half from Delphi. Thanks for the response! -Matt

Hello all, I have a 1976 CF685 pumper, and my fuel injector pump shutoff valve has frozen...I have been advised how much it would cost to have the thing rebuilt, but I want to explore my other options. The one I am considering is forcing the valve to the open position, then locking it in place, then putting a new manual (or electric) shutoff valve at the fuel entrance into the injector pump (still on the low pressure side). Does anyone have experience with this, or an reasons for or against doing it? Thanks