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  1. acme66

    Fluid Balanced M939 Tires: 5 Year Follow-up

    Years ago I balanced the tires on my M939A1 with antifreeze. Their were questions, fears and the occasional dire prediction of doom. Anyway, 5 years later I can answer some of those with real empirical data. I tried to put this at the end of the original post but it was closed, if a mod wants...
  2. acme66

    Killing NHC 250s -what we have learned killing 3 of them.

    This is a long post but then it is the full recap of three years of destruction and frustration. I put the list of things I wish I had done or known here at the top just in case you don’t feel like reading all of it. It is an interesting story and there is a lot to learn from my expensive...
  3. acme66

    Looking for EGT on NHC/NTC

    Almost ready to dump everything we know on burning out the 250 Cummins motors but I am trying to gather one last bit of info. I am looking for pyro numbers from other members. Would love the temp and where your probe is either as measured from the center of the exh manifold or in relation to...
  4. acme66

    Changing out the coolant on the NHC250

    Lots of talk of changing out the coolant on the NHC 250 because of liner failure. Well I have done that with three different motors so far and I just lost the third one today. If it was on your to-do list just put it off for a bit. I am at 100% failure the year after making the switch, all...
  5. acme66

    Building a start pre-lube system

    It has always bothered me how much my motor rattled until pressure came up. I also start the thing a dozen times a day or more and I have felt that has to be hard on it. One shop I consulted with about my string of blown motors also thought those could be related to how often I start it, they...
  6. acme66

    Air system road side emergency parts

    I was asked the other day what I carry in the way of spare parts. The answer is not much. Bunch of tools, grease, a gallon or two of oil, more tools, one wheel bearing and seal set, tools, jack, brake diaphragms, generic wire, tools, electrical splices and some other tools. All pretty...
  7. acme66

    Engine Pre-Oiler (soliciting opinions)

    So I have been designing and building a 24v pre-oiler for our M925A1 (NHC250) and have it all done but the squealing. It is compact, robust, clever, adaptable to any truck and quite cheap if I do say so myself. I have come to a sudden crossroads however and wish to consult the hive mind. My...
  8. acme66

    Crate Motor Questions

    Forgive me if there is a thread on this, I couldn't find it. Just trying to be informed as I decide to rebuild, repower or put a crate motor in our tour truck a 1984 925a1. I have ruled out a 'take out' motor simply because I am dealing with a 2 out of 3 failure rate on mystery motors so far...
  9. acme66

    Cooked #1 Piston

    Finally got around to pulling the tour truck motor down and found #1 was cooked with bits of skirt melted right to the liner. Clear that was where the water leak was coming from. Pitting seems to have eaten the o rings. Trying to decide how long it ran buggered and what came first burning...
  10. acme66

    Loose 939 spring mounts! Scary find!

    Giving the tour truck its weekly crawl under/over and I found something that I think is alarming and that you might want to check on your own trucks. Better than half of the bolts that held the front and rear spring perches to the frame were not tight, some barely qualified as 'snug'. Only two...
  11. acme66

    Pulling 250 Motor

    Liner failure in truck #2. We think it will be faster to swap in a motor from truck #3 than it will be to switch all the tour stuff over from one to the other. Right now I have two people searching TMs on how to separate the transmission from the motor in the truck rather than pulling them as...
  12. acme66

    Puffing white from the breather

    I have got the 855 in my 83 M925 puffing white out of the breather like a steam train after a momentary loss of power. Did I lose a liner o ring do you think? Power came back and I drove back 40 miles just fine. Ken
  13. acme66

    Oil Plug Drain Valve Source?

    Anyone sourced an oil plug drain valve for the 250? Like the commercial units where it screws in replacing the drain plug and lets you turn the flow of oil on and off? I took one of mine in to the local Cummings shop and they couldn't match the thread. Sure would make changes easier if you...
  14. acme66

    DeSpline Questions

    I have done a bunch of searching and could find some hard Duce numbers but can't seem to come up with any for the 939 5ton. Can someone with desplined hubs on a 5ton comment on what you have seen in the real world? MPG, tire wear etc? Have issues with bushing wear or? On road obviously but I...
  15. acme66

    5 ton 12v 5.9 repower?

    Now don't start screaming. I have a 250 855 in a m923 that has munched a liner. I will not be putting an unknown 855 take out in despite how cheap they are because this is a back up to my commercial unit and it has to be a known reliable. So I was going to reline and re piston the block...
  16. acme66

    Singling out the rear of a 5 ton

    I tried searching if any one had done this but I just get a wall of switching to super singles. Nothing serious but more than once I have thought about running just the rear most axle of my 939 tourist trucks. I don't need the double for weight and it would save on tires. The idea always pops...
  17. acme66

    5 ton test bed.

    I run the truck the exact same way everyday and keep meticulous mileage and maintenance records. It would be a perfect test bed for ideas you might have. For instance I can tell you that switching to 90wt in the axles and transfer case will give you a .2mpg fuel economy boost. Making the air...
  18. acme66

    923A2 No 5th Gear?

    Asking for a friend since I am not sure if there are specific differences between the A1s that I have and his A2. Recent fluid change, all by the book. 30 min of idle in neutral before driving. On the first flush the truck ran drove normally, shifted better but ran normally. On the second...
  19. acme66

    Symptoms of a failing lift pump?

    I am getting intermittent power loss. Sometimes I go days between episodes. Trust me when I say I have checked and eliminated all the easy stuff. Solenoid, tank, filter, lines, contamination you name it. I am either down to something like a plastic bag that drifts over an sometimes blocks...
  20. acme66

    PT Pump and Fuel System Gurus...

    My 1983 M925 has been a ball of fun the last few days. Last night while giving an offroad tour, after running flawlessly all day I felt a power loss and hesitation. I turned the truck around and refunded the money. Down hill it was idling fine. I started for home a trip of about 9 miles. On...
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