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Vintage Diesel and Oil Engines Fairbanks Morse, Lister, Petter, Witte and other pump injected Diesel oil engines.

Vintage Diesel and Oil Engines

Deutz F2L912 Help


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  #11  
Old 02-24-2018, 12:07:39 AM
ccs ccs is offline
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Default Re: Deutz F2L912 Help

@ cornbinder

Thanks again for all the info and advice. Wish the picture of the pump was bigger so I could see it better, but it kinda makes me want to pull it off of my engine and look!

Question for you though, if it had been running on only one cylinder, wouldn't it have been obvious that something was really wrong? While it's possible I wouldn't know the difference, just seems like with only 2 cylinders, it would be obvious?

I had the valve covers off the other day to work on those levers as one of them was really loose and I thought might be the cause of my frozen engine if water leaked in through it. And the other lever the screw that attaches to the "plunger" had snapped off so I was welding it back together. When I cleaned it up prior to welding I found that the screw was actually brazed to the "plunger," so I was really thinking this was some homemade setup. I'll get a closer picture and post it up.

Not liking the sound of how expensive this thing might be to fix. I know you said having someone rebuild the pump would be expensive, do you have a ballpark figure you'd be willing to throw out? I asked a good diesel truck mechanic friend if there was someone in town who might be able to work on this Deutz. He gave me a name, but apparently he's a shady character, so if I decide to go that route, I'd like to know if he's trying to rip me off.

Thanks again for the help.
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  #12  
Old 02-24-2018, 11:52:09 AM
cornbinder89 cornbinder89 is offline
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Default Re: Deutz F2L912 Help

2 cyl that are inline, have to be heavily counter-balanced so will have very heavy flywheel. You might not notice one dead cyl if the engine isn't under load.
If the compressor is 2 stage it might be as high as 175 psi for max, I think a previous poster said the outside 2 cyl feed the center.
I would guess that the throttle works like a conventional pressure switch, pressure builds to 125 psi then the unloader kicks and the rpm drops to idle and stays until 95 psi, when the unloader closes and the throttle opens.

No idea on cost of repair, I haven't been around a Deutz in 25 years or so.
Before you pull the side cover, it would be nice to find a manual. The cover gasket may be a selective thickness to set injection timing, if not the gasket for the injector element might also.
As to pulling it apart yourself, it depends on your skill and understanding of how diesel injection works. If it is all a black box mystery than I would caution against it, If you fully understand how it works, have been in several pumps, just not one like this, than I would say go for it. Only you can assess you comfort level delving into it.
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  #13  
Old 02-25-2018, 03:29:18 PM
ccs ccs is offline
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Default Re: Deutz F2L912 Help

@ cornbinder

Thanks for setting me straight on the running on one cylinder issue, probably I just didn't realize it.

I believe the compressor is a two stage. I don't really know what aloris meant when he said the "2 outside cyls feed the middle." I believe the larger cylinder on the right is the low pressure side and is fed by the intake in the center. The smaller cylinder on the left I think is fed by the one on the right, around behind them through the intercooler. The air outlet comes off of the left hand cylinder.

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Here's a couple closeups of the levers on the valve covers. They really don't look original to the engine to me, and they don't seal very well.

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I tried to find a manual before I started bothering you guys here at smokstak. I bought a service manual off ebay in digital form that claimed to cover this engine, but in fact it did not. It only covers the newer styles and nothing smaller than a 3 cylinder. The seller dug around and was able to locate a manual for this engine, but it's in German only. He said I could buy it, email it to him and he would use Google Translate to give it back to me in English. I haven't tried that, am doubtful about the finished product but I suppose its an option.

Unfortunately, however, I think you've dissuaded me from pulling it apart myself. I don't understand diesel injection very well, don't understand how they work and have never been in one. So, that pretty well rules me out! Perhaps I can find someone in town to either rebuild it or help me understand enough that I might have a chance.

At any rate, thanks again for your time and help, much appreciated.
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  #14  
Old 02-25-2018, 09:04:00 PM
cornbinder89 cornbinder89 is offline
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Default Re: Deutz F2L912 Help

Ya, those compression release levers are NOT factory, It would be nice to find a new set of valve covers and just eliminate them all together.
A German manual would be worth having if that is all you can find, Often it is the spec's and assembly diagrams that you need, and the text is secondary. When you run into something you need translated, you can deal with it at that time. May be a local high school has a German teacher, or may be someone here can translate.
I worked on Austrian buses 30 years ago, and can neither speak nor read German but some how I muddled thru.
As I said, all the stuff I worked on, I remember having an inline pump, I don't remember what the one 2 cyl had for a pump, it may have been like yours or may have had a Bosch inline pump.
I have no clue about the compressor as I have not worked on them. Most 2 stage compressors can pump to 175, while most single stage compressors are limited to about 125 psi.
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  #15  
Old 03-10-2018, 11:59:09 PM
aloris aloris is offline
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Default Re: Deutz F2L912 Help

So sorry just revisit this discussion and had a more careful look at your pics, mine is a 2 stage 3 cyl. 1big primary in centre and2 secondary on outside. Same air to air intercooer fed by bleed off from eng cooling fan. Mine is 85 cfm. I have mine set to unload 150 psi and load 100 psi. With the small tanks it will cycle frequently but ceep up with any needs i have with tools and tyres.the truck you described was probably set up for truck or heav5 equipt such as myself. Remove the eng side cover. Inj shops will have access to the inj pump elements as they are the same type used in the inlins pumps. The are made all over the world and are priced quite competitive for what they are.do not touch any threaded adjustments and keep the shims. This was a great design carried over to their later engs. Mack even did it on their last inlines. Take it apart. Thats how you .learn. no poppind springs or balls. Mike a
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  #16  
Old 03-18-2018, 10:01:48 AM
ccs ccs is offline
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Default Re: Deutz F2L912 Help

Ah, ok that makes sense. Thanks again for the info. I got busy with other projects (calving time around here) and haven't done anything more with this engine so far, but am still hoping to!
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