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1968 ford 3000 Simms injection pump oil change help?

J

Jhutch

Member
Have a 1968 ford 3000 with a Simms pump. I was going to
change the oil in pump and pulled what I believed to be the
full level plug, out came loads of diesel fuel. I was going by a
diagram I seen on the Internet. So how is it getting fuel in the
oil? Bad diaphragm in the fuel pump is my guess. But I wanna
make sure the plug I pulled is what I think it is. It?s to the front
of pump just a little over a arm that looks like it would be to
adjust the govnor.
 
Oil LEVEL plug is on the pump side, oil DRAIN is in line with the level plug on the bottom. Oil fill is the large plug at top front of the pump. Fuel into the cam box is usually the feed pump diaphragm, but there's also some normal leakage past the pump plungers..
 
I pulled the fuel pump and Diesel came running out. I pulled the pump apart and there is no evidence of fuel making it past the Diaphragm its dry behind it, so fuel is getting in somehow else. Does this mean the injection pump has serious issues? Tractor ran great. What should I check now? When tractor was running it had a small fuel leak witch now suspect was coming from the over flow back Banjo bolt. Witch means it?s leaking fuel in there the whole time it?s running.
 
That's pretty common with Sims/Minimec pumps. I wouldn't worry about it if it runs ok. Just change the oil (diesel mix) in the cam box regularly. If you are not clocking up many hours per year, do it every 6 month or less. It only takes a few minutes and a pint or so of oil. Be careful not to strip the plug threads in the pump body. Level and drain plugs should be 1/2" and fill plug on top should be 15/16".
 
I just bought it, I noticed a fuel drip while it was running. Only because it has a hoe on the back so i was setting in one spot for a while digging, and noticed a puddle of fuel in a tread mark, I decided to change fuel filters and check were leak was. I thought about throwing a new lift pump on it. But it sure does look like fuel was making it past the diaphragm dry on back side. So i believe it?s coming from the barrels. Watching it running it was a really slow drip. Can I run a heavy oil that way it takes longer to dilute it out?
 
I think you can assume the prior owner didn't service the pump. At least it's got something in it. When I bought my 655A TLB, I found nothing in the injector pump but a dribble of rust[fuel?] colored liquid. Had to have the pump rebuilt a while later.
 

That is perfectly normal. My 9000 will replace the oil with fuel in a dozen hooks on the transfer sled, but it is running pretty high pressure. The pump on my 9000 has a 1/8 inch overflow tube on the back. You are supposed to use the same oil as you use in the crankcase, and change it at every engine oil change. If it overflows before an oil change is due it is diluting faster than it should, but it is not a big deal, just change it more frequently.
 
Thanks for all the replies. I?m gonna put fresh oil in it and see how long before it starts dripping out the over flow. No more oil then it holds, I?ll just change it quite often. Tractor runs great. After seeing it?s no big deal I sure will sleep easy tonight. Thanks again guys
 
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