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75' Ford diesel pump injector

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Tennesseetom

04-28-2008 03:12:24

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I have a 75 Ford 7200 that is "making oil". I've already eliminated hydraulic sources and have been told the fuel pump injector needs rebuilt, a pricey job to say the least. Is anybody familar with this model? Is there any solution other than a total pump rebuild (pump is a Minimec)?

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RodInNS

04-28-2008 04:44:52

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Re: 75' Ford diesel pump injector in reply to Tennesseetom, 04-28-2008 03:12:24

It's not impossible for a Minimec pump to force fuel into the engine, but there would be some erratic govenor behaviour if it was. For the Minimec pump to do this, first you need a plugged breather tube on the pump's cambox so that any leakage fuel in the pump can't escape. Then it might force fuel/oil past the pump shaft seal and into the engine. I'd hazard a guess that IF there is a surge of fuel in the pump's cambox that this fuel is coming from a bad diaphram in the lift pump which is driven from the pump's cam. So.... check that the pump's breather is clear and check that the lift pump is not buggered. I'd do that and probably change the lift pump if I was suspicious of it in any way before removing the injection pump. Those pumps more typically run in the 2 grand range around here, but not too many ofthem ever need to come off the tractor....

It's also possible for a bad injector to dump fuel into the engine and have it wash down past the rings.... BUT, on that engine it would run quite rough in that situation and probably make a lot of white smoke.... so you'd probably notice that.

The most common source of a ford engine making oil, BY FAR is a bad power steering pump. When they get worn to a certain point the shaft seal will leak... into the engine. If you're constantly adding PS oil, that's likely where it's going.

Rod

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Tennesseetom

04-28-2008 05:11:38

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Re: 75' Ford diesel pump injector in reply to RodInNS, 04-28-2008 04:44:52

The tractor runs well, smokes (white)a little for 30 seconds to a minute but clears up and runs smooth. Sorry for the simple question but I haven't spent a lot of time around tractors... where is the breather tube, what does it look like? How would I go about cleaning it out? I changed the lift pump when I first noticed it occurring. After eliminating that I checked the power steering pump which I ended up replacing (had 3 seals and worn shaft). How do I go about checking for leaky injectors?

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RodInNS

04-28-2008 05:29:58

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Re: 75' Ford diesel pump injector in reply to Tennesseetom, 04-28-2008 05:11:38

Startup sounds normal.
The pump breather tube is just a 1/8" tube around the back side of the pump and it should run down along the engine block. I believe it's attached to the pump with a banjo fitting. Just remove it and blow it out with air. Also, just remove the level plug from the pump and see if the cambox is full of fuel. That will tell you right there if that's the fuel source or not.
To do a quick check on the injectors, start the tractor, warm it up a bit and then at idle open one injector at a time. Try to determine if the engine staggers about the smae amount each time. If you open one and the engine doesn't stagger, or it's less than the rest you would pull that injector and look at it. Otherwise I wouldn't pull any of them. If you do go to remove any, hope that the injectors are on bolts rather than studs... Get two big curled pry bars (injector bars) and lift evenly on each ear of the injector. If the injector is bolted in then you can give the injector a twist to break it loose. If it's on studs, you can't...

To be honest I've never seen a Simms/Minimec pump get bad pumping elements to the point that they're passing a lot of fuel. I've heard of it, but not seen it myself. I'm told the tractor will start hard when it's hot if that's the situation.
The other possibility is a crack in the pump's fuel manifold or a perhaps a bad gasket, although I'm not sure about the gasket....
This is getting complicated.

One more thing that I just though of..... Pull the air intake hose off the intake manifold and look in at the thermostart unit. See if there's fuel running down the manifold. That's another culprit on those tractors. Check that FIRST. That would be an easy fix.

Rod

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Tennesseetom

04-28-2008 07:57:08

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Re: 75' Ford diesel pump injector in reply to RodInNS, 04-28-2008 05:29:58

Once again, sorry for the lack of knowledge. If there is fuel running down the manifold what is the cause/solution?

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RodInNS

04-28-2008 13:27:03

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Re: 75' Ford diesel pump injector in reply to Tennesseetom, 04-28-2008 07:57:08

There could be fuel leaking out of the thermostart unit. If there is you may see it dripping or evidence of it running down the manifold. If you see any evidence of a fuel leak, replace the thermostart unit. They're not terribly expensive.

Rod

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Circus

04-28-2008 03:47:07

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Re: 75' Ford diesel pump injector in reply to Tennesseetom, 04-28-2008 03:12:24

I take it your talking motor oil. There is no connection of the minimec and the motor oil sump, at least not on mine. A diesel rarely floods so it's coming from elsewhere. Maybe the fuel lift pump. If it runs, the minimec is OK. PS Change the minimec oil. It's often overlooked. Good luck

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Tennesseetom

04-28-2008 04:49:01

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Re: 75' Ford diesel pump injector in reply to Circus, 04-28-2008 03:47:07

Yes, I am talking motor oil. The dipstick shows it slowly rising every time I run the tractor. I changed the lift pump last year when I first noticed it. So when the minimec goes, it's pretty much done (tractor won't run)?

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kyplowboy

04-28-2008 03:34:48

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Re: 75' Ford diesel pump injector in reply to Tennesseetom, 04-28-2008 03:12:24

I have a 6700, I think has the same pump. I had mine rebuilt about 6 years ago. There is a little shop not too far north of me in Elderado IL, that alot of people around here use (faster, cheaper, and some say better than the joint in Evansville.) for about $700. Biggest pain I had (other than right'n the check) was the gear that bolts to the end of the pump has "slotted" holes in it for adjustment and I could not get the bolts tight enough to hold where it is supossed to be. I had to take the cover off, loosen the bolts, re-aline the marks 4 or 5 times. The last time was about 11pm try'n to get hay up before rain, one drop of red loc-tite on the bolts and they have not moved yet, just hope I never have to take it off again.

Good luck,

Dave

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