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Posts posted by International3964

  1. Good afternoon, 

    I'm planning to change out a head gasket and crankshaft seal on my DT-429 in the next few days and am curious if anyone one here has a service manual for this engine? 


    I purchased one off ebay a few weeks ago but it shows no sign of arriving any time soon... 


    I'm mainly concerned with whether or not I can re-use the head bolts, and what their torque specs are (as well as pattern, however this is not critical). 


    Any information regarding this engine would be welcomed. I realize this thing probanly belongs in a museum given the lack of parts available, however it's worth a shot for me to service it myself and hopefully get someore hours out of it! 


    Thank you. 




  2. Well guys, I'm very happy to share I've got the engine running! 


    As several of you suggested, the metering valve was in fact stuck. I removed the top of the injection pump and sure enough, the metering valve was gummed up and sticky. I simply moved it with my finger back and fourth until it was smooth. 


    Once the metering valve was freed up, I noticed moving the throttle still didn't engage the valve, but I made a quick call to a local repair shop and they said that's normal. 

    Honestly, even once the metering valve was freed I wasn't hopeful that it would pump, because the entire throttle mechanism inside the pump had a lot of play, everything was quite loose. But I figured it was worth a shot and sealed it back up. Sure enough after a few cranks it began to spit fuel. I blead the lines and tightened everything up and it started after about three cranks. I gave it a very small shot of ether, but it took off right away. 


    Still lots of work ahead of me since the oil is a milkshake (assuming blown head) but I was able to order a gasket ($800 CAD to the door 😂). 


    I'll keep everyone updated with my progress. I noticed the crankshaft seal is shot. These 429s are pretty rare these days, sourcing parts should be fun. Hopefully it doesn't need much once the gaskets replaced! 


    Again, thanks for all the info. You guys saved me anywhere between $1000-3000 for a pump rebuild. 



    • Like 1
  3. Thank you all for the information, I very much appreciate it. 

    I tried to pull the head off the pump last time I was out in the field (these things never die in your back yard haha). 

    The screws are pretty old and will take a great deal of care to remove, but I'm very curious to inspect the metering valve. If the valve spins freely with the throttle, I'll have to assume it's stuck plungers. 


    I've got a rebuild kit ordered but shipping these days is deplorable at best... Looking like another month until it arrives. 


    Worst case I'll pull the pump and take it to a shop tomorrow. 


    Again I very much appreciate all of the feedback, you have hopefully pointed me in the right direction! 


    I have been reading up on these pumps non stop and feel confident I could tear one down and reassemble, it's just an issue of time now. 


    I'll absolutely post back with photos on my progress. 


    Hopefully my injectors aren't too gummed up... That will be the next thing 😂


    Thanks again and happy Thanksgiving! 

  4. I made a short video of my attempt to start this thing. Is there anything I'm doing wrong or missing? The first attempt I didn't engage the throttle enough however I did the second time. Every time I attempt to start I move the throttle to wide open. 

    Can you see anything wrong here? I was told the machine ran a few months ago. To me it's looking like a pump rebuild, but that's going to cost me between $1000-$3000... The machine is in an auction yard and needs to be moved sooner than later. I'm still hoping it's something stupid I'm missing... 


    The pump shaft is spinning, I checked the fuel inlet screen and it was perfectly clean. 


    Any help is appreciated! 

    (cranking it over like that isn't easy on the batteries but I let it cool down before next attempt) 


    • Like 1
  5. I'm looking for information on this fuel injection pump for my DT-429.

    Roosa-Master DCGFC 627-25AJ

    I'm not getting any fuel to my fuel lines when turning the engine over. 


    I have bypassed the fuel tank due to questionable fuel quality and there is an electric lift pump supplying clean diesel to the injection pump. I can confirm fuel is getting to the injection pump but there is no pressure coming to the fuel lines when turning over. 


    Is there a fuel shut off that I may have overlooked? 


    The throttle linkage has been set to various positions when cranking over and still no flow. 


    I was told the machine was running a few months ago, hansnt been touched since. 


    Any ideas? 



    • Like 2
  6. 13 hours ago, hardtail said:

    I have a UDT429 operators manual

    Also DT358 for 3964 operators manual so perhaps that was the original engine?

    Thanks for the reply! 


    When you say operators manual, does that include any service information for engine repair? And if so is that in digital format? 


    Sourcing a gasket is proving to be a lot more difficult than I thought. Kind of has me considering another engine all together... Fingers crossed I can find something! 


    I'd love to hear from anyone else who may be able to shed some light on this engine or machine! 




  7. Hello! I recently purchased an older International 1974 3964 excavator from auction.


    It has a blown head gasket which I'm looking to replace. From what I can tell it's got an IH DT429. There isn't much documentation available regarding these machines, however from what I've been able to find it looks like the DT429 was in a few bulldozers and tractors (4100 / 4156). The engine presently in the 3964 appears to have been swapped because I've found some cut marks in the supporting frame and there are shims holding it in place. 

    I've managed to pull a few numbers from the head and block (again searching these numbers yields very few results) which along with photo comparisons lead me to believe it's a DT429. 

    I'm looking for some information regarding both the 3964 as a whole, as well as info on the DT429. Does anybody here have a service / parts manual they would be willing to share?

    I'm in need of a head gasket, can anyone speak to the availability on this / where I'd potentially get one from? I've been searching and searching for weeks to no end. Some sites list them but there are no prices, leading me to believe they're unavailable. 


    I have very little information on the machine, other than it came from New Brunswick Canada. I've found a lot of soot near a section of the head gasket, looks like it was run for some time the way it is. The cooling system is a mess, full of leaks and cracked hoses. The engine oil is a milkshake, I've not run it yet due to dead batteries and the coolant system being a mess. I'll hopefully have those repairs made this week and attempt to flash her up long enough to move it onto a trailer and tow it home.                       


    Any help with this would be greatly appreciated.


    Serial Numbers I've found:

    Model: 3964X (Supposedly from 1974)

    VIN: 3290002F007-1040X

    Head: 323939R3

    Block: 323885R2

    Coolant Pump: 343792R92














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