ford 3000 simms injection pump

[workingman]

I have a late 60's ford 3000 sos with the simms injection pump. I was using it when I noticed a lose in power. I looked in the fuel tank and seen it was amost out. I shut it off and added fuel. It restarted but it was hard. I could tell it wasn't firing all 3 cylinders. I drained the fuel, changed the filters, and primmed the system according to my i&t manuel. I can't get fuel to the back cylinder on the engine. The engine will start and run on 2 cylinders but I can't get fuel to that injector.I do have some fuel bubbles comming out of the end of the fuel line. my question is, am I having a really hard time getting the air out of the system, or is this typical of the injector pump when its going bad. I really appreciate any help. Thanks!

 

[Dieseltech]

Rear pump cam bearing bad or #3 plunger spring broken will cause the trouble you describe. Most Simms trouble is due to lack of oil in the cambox. Last one I repaired was really rusty inside, fellow bought it at auction. Ran fine for some time but pump never was serviced while he had it, and he was never aware pump is not engine oiled like newer models are..

 

[Bern]

Agree with diesel tech. Most likely broken plunger spring - easy fix.

 

[workingman]

I pulled the pipe fitting out of the top of the injection pump to expose the delivery valve. The spring appears to be ok. I cranked the engine over and a lot of junk came out of the injection pump were the delivery valve was. Could there be a o ring or a delivery valve seat that could be out. Thanks again for the help.

 

[Bern]

You removed the wrong part I'm afraid. I'm guessing you removed part #90 to access spring #91. If so, that's not the spring in question.

The spring in question is part #92. It can be visually inspected by removing cover # 110, along with pieces # 77 & 77A. If indeed the spring is broken, part #1 will need to come off the pump, similar to removing a cylinder head from the engine.

Cleanliness is of the utmost importance while doing this.

 

[workingman]

Thank you so much bern. I will pull the inspection cover off the first chance I get. If the plunger spring is broke, do you have any idea where I can get one?

 

[Dieseltech]

The spring #92 in Bern's photo is Delphi part # 25883. If you do have one broken change all three when you take the block off. Be careful and DO NOT mix up the plungers to barrels as they are mated parts. If you find the ball type cam bearings bad they are superseded to tapered bearings, Delphi # 503742. The early style delivery valves had nylon type sealing rings that used different delivery valve holders. The late top face sealing valves used an O ring between the valve and barrel to seal the block and a steel washer to seal to the delivery valve holder.

 

[Bern]

Any CAV pump shop. As dieseltech said, be sure to do all 3.

 

[RodinNS]

You can also get the plunger springs through CNH...
I got some a while back but forget how much they were. It would certainly be worth checking with the CAV dealer as well.

Rod

 

[showcrop]

(quoted from post at 17:28:51 08/24/15) Thank you so much bern. I will pull the inspection cover off the first chance I get. If the plunger spring is broke, do you have any idea where I can get one?

Workingman, You didn't acknowledge changing the oil as you were advised. Have you done that yet? A flush with fuel may be in order with your description of what came out already.

 

[workingman]

I would like to thank everybody so much for all the help. I found the plunger spring to be broke. I talked to a local tractor repair shop and he said it would be a easy fix for him. So, just to be safe, I'm going to take the tractor to him. Thanks again

 

[vtjoe]

i would love to to know where bern got that exploded view of the simms pump

 

[Sean in PA]

(quoted from post at 16:43:19 08/25/15) i would love to to know where bern got that exploded view of the simms pump

New Holland parts site:

[u:a0172aa4ad]3000 Simms Pump Parts Diagram[/u:a0172aa4ad]