HELP identify injection pump part

Hi. Have an old Kubota M5950. It has a rotary style CAV/Lucas/Delphi injection pump. It is leaking from a small screw at the bottom. I'm having a hard time finding the part on a diagram. It's not even in the parts manual. Can anyone help me identify it? What is it? and what was the function? where might I find one other than a junkyard?

It looks like a small screw that is bent with a rubber inset at the top. It screws into a hollow nut. The screw has two holes that might have held a cotter pin.
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That's the advance lock out stud, when it's deflected in any direction it pushes up a small pin inside, holding a steel ball against it's seat so the advance stays retarded for easier cold starts. I replace the seal inside the head bolt assembly each time the injection pump is in for repair.
 
Sorry to OldKubota for hijacking your question I have a question about the same part.

Hi Dieseltech

As you know about this pump, I have one similar on My JCB with a 4/98 Leyland motor. The pull cable in the cab runs down to the pump and there is a spring should attach it to this lever . The springs broke and seems to be a special one I found online in The UK at a great huge cost for it with the exchange rate/shipping to Canada. Do I actually need that spring or can I just hook the cable up without it, or will just a light spring from the hardware in town work. That pumps real expensive to screw up here in Canada, I don't want to wreck it for not having a $50 plus spring or the advance to not work right.
Thanks in advance for any help you might be able to offer.

Regards Robert
 
In most weather the engines with this pump advance lock out will start fine without using it, does help in really cold weather though. If you can find a spring close to the same wire size and coil count at the hardware as the old one, it should work just fine. I've had pumps sent from Canada in for repair, shipping does cost a bit more than the states though..
 
Hi
Thanks for the reply, I'm going through the machine and fitting a new cold start glow plug and Ignition switch. This machines been messed with by the Monkey or 2 that owned this before the auction. I found it's real good for digging snow last winter and worth fixing more things now i ran it longer. I had planned on warmer weather use only, so it wouldn't of been a problem. I would like to get a circulating block heater on it to.

I'll try find a spring or just bite the bullet on the proper one, as there is a chance this machine could be parked away from electrical power sometimes. I want to give the poor thing every possible chance of a longer life in - 15oc or colder .

Regards Robert
 
Thanks - we had the pump rebuilt by a diesel shop and it came back leaking from this advance lock out stud. I will contact the diesel shop and ask them if they can get me a replacement spring and washer.
 

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