Jump to content


  • Posts

  • Joined

  • Last visited

Posts posted by WaldoTD9

  1. Thanks.  It was "fun."  It sure was a lot cheaper and easier than trying to switch over to an IH pump and injectors.  It also gave me some more experience on my lathe making the fittings and such so now I'll know how if I need to tackle something like this in the future.

    By the way, I now have a pop tester that I hope I will never have to use again if someone else needs one.  I'd sell it or loan it if someone has a need.

  2. So I got her up and running today.  No issues, other than getting the fuel lines to seal.😒  It has a lot more power.  I was actually able to get it going in 5th gear which I couldn't do before.  Before, it would just stall out on me if i tried.  I'll tell you, that thing cruising along in 5th gear is quite a ride.  I didn't have time to do any real work with it other than make quick work of a 6" pine tree.  It did stall on me trying to go up hill in 3rd gear.  I don't know how much power it is supposed to have, and after 76 year, what should I expect?  Overall, it was certainly worth the effort.  At least now I can expect to do some work with it. 

    Once I am finished compiling all my videos into one I will post it and provide the link here.

    • Like 1
  3. Thank you all for the kind words.  If my adventures can help someone else out there figure out how to fix their machine, it makes it all worth it.  I was hoping to take it for a test drive today, but by the time I got everything back together it was dark.  I also checked and adjusted intake and exhaust valves (which were also way off) while I had the hood off.  I'll fire it up tomorrow and let you all know how it goes.  Fingers crossed.  If anyone needs help doing something like this on their machine and need information, don't hesitate to ask. 

    On a related note, it's irritating that you can't find a local shop that will do something that seems so simple.  I know they have to make a buck, but does it really require that much more specialized equipment to run one of these pumps on a stand?

    • Like 2
  4. I got my pump all back together, which was not that difficult.  I made all new paper gaskets out of the readily available FelPro rubberized gasket material available at most auto part stores and online.  The one lip seal for the camshaft seal was easy to source from McMaster.

    The biggest unknown was, would it work.  It actually didn't take me that long to put together a test bench.  I was going to pull the motor off my Craftsman table saw so I wouldn't have to buy a new motor just for this single use, but then a friend of mine suggested I just leave it in place and use the table saw table to mount everything to.  Genius.  All I had to do was get the 3500 RPM table saw motor down to the 550 RPM to drive the pump called for in the manual.  Luckily, I was able to do this with two pulley reductions.  Again, I just ordered four new V-belt pulleys from McMaster to step it down.  I went 1.5" to 4" (motor to blade arbor) and 1.5" to 4.5" (blade arbor to pump). I should have used two 4.5" pulleys because my final pump speed was about 650 RPM under load.  I was able to get that down to ~550 by raising the blade arbor so the belt would loosen and slip a little.  It worked great.

    I ran the pump at the original settings it had when I pulled it off the tractor and saw why I was having power issues right away.  I was getting less than half the fuel delivered I was supposed to.  I adjusted the plungers (a lot) and got them all to consistently deliver the 48 ml required.  I ran the test four times to be certain I got it right.  Now I can't wait to get the pump and injectors back on the tractor to see how it will run now.

    Here is a picture of my setup.  I also took a bunch of video I will compile and post to YouTube if anyone wants to attempt this themselves.  The hardest part was actually making all the fittings and lines.  Since the pump and injectors use nonstandard fittings I had to make them all from scratch on my lathe.  They turned out well, it just took some time.  I didn't spend more than a couple hundred dollars to do this whole job (rebuild injectors, rebuild pump, construct test bench).  


    • Like 8
    • Thanks 2
  5. I was finally able to get my injectors back together in a manner that they opened at the proper pressure and were within specs on holding pressure and leakage.  Just in case anyone else plans on rebuilding their injectors, it isn't hard, but it is tedious and it may take MANY tries to get the valve to seal. At first I tried lapping the valve and seat together and that would not work even though I had very very fine lapping paste.  After doing some research on valve lapping (most of the information is on car engine valves) I discovered that you can't get the valve to seal by lapping it. So I had to "regrind" the valve and seat by using very fine sandpaper (400-1500).  I put the valve stem in my lathe, spun it at 300 rpm, wrapped the sandpaper around a 1-2-3 block, and held it against the valve sealing surface. Then I did the same thing on the valve seat but used a deburring tool to get the proper angle on the seat.  The seat was easy, the valve was more difficult to get nice and flat.  They are pretty small.  I ground the valve till I got a nice consistent contact ring indicated by putting layout dye on the valve and spinning it lightly against the seat.  I did all four valves this way.

    Now I am in the process of reassembling my pump which I will test before it goes back on the tractor. 

    • Like 1
  6. bcf180,

         Mine is the top one.  The fitting threads for the fuel line on mine are 5/8-18.  What is wrong with your injector?  I've disassembled most of mine and there is not much to them to go bad.

         As for my injection pump, it should be good to go once I put it back together and set it up.  It was pretty dirty on the inside and I could tell when I pulled it apart that the plungers were not all set the same.  I have the materials to build my test bench and injection lines.  I also bought a pop tester to set up my injectors.  I just need to make the lines.

  7. No.  I guess I should have asked if anyone else on here had their own test stand that was willing to set up my Bosch pump or knew anyone that did.  Every place I have called that is supposed to be able to help with these pumps has stopped doing it.  Maybe they still do the IH pumps, I don't know. One place I talked to said it would cost a few hundred dollars just to get the adaptor to hook up a different pump to his machine.

  8. Hello all,

        I decided to start a new thread with the teardown and rebuild of my Bosch injection pump.  My other thread about the pump was geared toward replacing it with an IH pump, but I haven't gone down that road, at least not yet.

        For those just joining the story, my TD9 was running fine on diesel but had NO power.  I couldn't even get it to go in 5th gear without stalling.  There was no smoke in the exhaust and the timing looked correct.  Just no power.  So I pulled the pump of a couple weeks ago and started tearing it down a few days ago.  I have the service manual that covers both the IH pumps and the Bosch pump. 

        As many of you already know, there is practically no shop around that will, or has, worked on these pumps and parts are hard to come by (understatement of the week).  I did talk to a shop in Philadelphia that could do and even has the proper test stand setup to calibrate it, but the price was astronomical.  So here I am doing it myself.  The Bosch pump does require a few special tools to get it apart which I'm fabricating as I go.  There don't seem to be a lot of proprietary seals that I won't be able to get from McMaster.

        Anyway, I have the pump about half apart.  I haven't found anything yet that would cause my low power issue other than the innards are FILTHY.  Looks like a lot of old crusty oil.  I was stressing that the cam was going to be wiped out when I removed it, but it actually looks really good.  There is a little pitting on two of the lobes, but not bad.  I measured the lobes and they all measured within a couple thousandths at 1.220".  Here is a picture of the cam.  The Bosch pump has roller followers and you can see on some of the edges of the lobes where the rollers didn't ride and there is no wear between the edge and the center.

         So far it doesn't look like any of the parts are unserviceable.  The harder part is going to be building a test bench so I can set it up properly.  I'll post more as I go.



    • Like 1
  9. Well, I got my pump and injectors off.  The injectors have certainly been messed with before.  I use the word "messed" for a reason.  I found a place that said they could do work on the pump, but didn't fill me with a lot of confidence they would actually fix it after taking a boatload of my money.  So I started pulling it apart myself.  I have a pop tester on order to set the injectors up correctly and it looks like I will be fabricating a test stand for my pump so I can calibrate it.  I'll start a separate thread on that later.  All in all the cam doesn't look that worn.

  10. What's the worst that could happen? 🤪

    I don't know a ton about these specific pumps.  I have a lot to learn.  I did buy the Injection pump manual from Jensales and it has all these pumps in it.  I also have the service manual that covers the injectors.  I don't know how much help they will be.  I think they at least give fuel delivery parameters if you run the pump and injectors on a stand.

  11. I had thought of that.  If I have the capability I would certainly offer my services to help out the group.  But as you said, getting the specs on the parts would be the hardest part.  I'd either need one in good shape to copy or just figure out what a good profile would be.  It isn't rocket science.  We did that in school actually.  

  12. Thanks.

    I did have a "crazy" idea this morning.  If the pump internals are worn out, namely the cam from running with little oil, how difficult would it be to machine a new one?  I already have a small machine shop (lathe, mill, etc.).  So the extra tooling I need to grind the cams might be the cost of a "new" pump, and then I'd have some new tools 😁.  I think the hardest thing would be finding out what the original cam profile was.  Alternatively, there are plenty of hot rod shops out there that grind custom cams for cars.  Any reason they couldn't grind one for an injection pump except for the previously mentioned cam profile?

  13. Yeah, that is my question.  I thought I read you could use the same injectors but that the line fittings were different so I would have to have new lines made as well.  Not an insurmountable hurdle. 

    I guess "expensive" is relative on getting one rebuilt.  I do see a lot more "A" pumps for sale (I don't see any Bosch,, really) which means I may actually be able to find one that work if mine is shot.  All speculation though.


  14. Hello everyone.  I've started to do some more work on my 1945 TD9 with a Bosch injection pump.  Last year I did all the clutches, worked on the engine and got all the hydraulics going.  I finally got it out to my farm to do a little work and it just didn't have any power.  It idled and ran in gears 1-3 fine, but just wouldn't push an dirt to speak of.  Didn't smoke at all and I checked the pump timing.   Anyway, I knew I needed to have the pump rebuilt anyway since there was diesel in the pump oil sump.  I know the Bosch pumps are hard to find someone to work on, and when you do, they are way more expensive that the IH "A" pumps.  So my question is, what does it take to swap over from the Bosch pump to the IH pump?  I don't know if my pump is worn beyond repair yet.  I'm just trying to gather all the info so I can make an informed decision if it comes to that.  I think I've seen that information on the board before but for the life of me I can't find it.




  • Create New...