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  1. jarhead1086

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I found this while trying to find out how to plug the vent holes Hasbeen was talking about. 3% derate per 1000 ft elevation would explain why she was so tired at 7000 ft going through southern Utah. I remember seeing this in another post but found it in print and thought to stash it here. In...
  2. jarhead1086

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I have 4 months of salty roads so she is in the garage getting worked over. Easy part is done. I have an intercooler like Bjmca (sp?)used in his conversion which simplified the hook up. Its getting powder coated (junk yard dog) and will be back in a couple weeks. Rebuild kit on order. I still...
  3. jarhead1086

    M929A2 crankshaft seal replace

    I found this post quickly in a search, I either got lucky or I'm finally getting better. I also realized I had not downloaded all the TM's. I checked the dynamic balancer and align marks are exactly aligned but barely visible with the paint. I turned the crankshaft screw and it just turns the...
  4. jarhead1086

    M923a1 failure, need input.

    When all my nasty brown stop leak fluid blew out on my recovery I luckily had a friend who knew about this and answered his phone. I was clueless, but he said I had to get Fleet SCA precharged. I just followed directions and glad I did after reading these stories. Mine is made by Peak, bought it...
  5. jarhead1086

    M925A2 ( M939A2 Series ) Engine Coolant Cab Heater Performance

    My heater is in great shape, but I am looking to possible remove it and replace it with something that fits better as I juggle things around fitting a turbo in this winter. As others have stated, I don't drive mine on the salted winter roads, but heat is still absolutely necessary. I am not sure...
  6. jarhead1086

    923A1 .. Going turbo next week...

    I pulled two sets of manifolds today and they both had issues. One had a crack on the center section and the other set looked great until I separated them and noticed it had sealing rings on the male ends and the female ends were sleeve repaired. I heard this was only done for a few years and I...
  7. jarhead1086

    923A1 .. Going turbo next week...

    Thanks for taking time to share how you did this. I will be looking for an intake manifold like this one. My turbo will sit higher and closer to the block so it would be a short straight shot across. Still debating on the air filter, but leaning on mounting to the passenger side of the tire...
  8. jarhead1086

    NHC 250 5 Ton performance

    Thanks for all the helpful input here Gentlemen. I experience the lug here in Utah climbing steep hills at 7000+ elevation. It ran much better in Barstow during my recovery with my brakes dragging. I thought something was going wrong and kept checking things. I bought a brand new turbo from an...
  9. jarhead1086

    923A1 .. Going turbo next week...

    I will be pulling the exhaust manifolds off the parts truck on Monday. Probably take the oil lines and flexible 5" exhaust line too. The parts truck has a huge liquid intercooler which I don't want to mess with. I am curious what your new intake manifold looks like jdknech. I am also curious to...
  10. jarhead1086

    923A1 .. Going turbo next week...

    I saw the job that M215 did adding the turbo to his M813, we should hire him. He made it look easy under a narrower hood. I am thinking about pulling the heater box and heating the cab with a 24V instead to make more room. The tranny filter underneath could be moved to the frame below and to the...
  11. jarhead1086

    Down off the mountain, AMA

    I am looking at doing a rear exhaust and would like to know how you would do it knowing what you know now.
  12. jarhead1086

    923A1 .. Going turbo next week...

    Thanks Powerstroke. I received the turbo today very well packaged and preserved air tight with an oil film. This is a serious contraption and heavy! I read the warning from Borg Warner about FOD ingress being the most common cause of failure. They also warn about loading the housing and causing...
  13. jarhead1086

    Increasing PT pressure

    After I put mine back together it was running way too hot. It would jump the EGT's to 1000 easily on a flat with no load while accelerating. I had to back out the screw on a few small iterations until I felt safer with the EGT's. I am hoping to get a turbo, 5 "exhaust, and the air filter from...
  14. jarhead1086

    Alternator Problems on 5 Ton

    I had the dual 12 & 24 volt alternators on my Deuce. Sure was nice having separate redundant systems and a bank of 12 volt batteries for running things in the cargo area while camping. I will search on this Delco mod. My alternator seems fresh and steady, but I am trying to think and learn about...
  15. jarhead1086

    Alternator Problems on 5 Ton

    Is there an aftermarket regulator that is more robust or reliable than these OEM ones? Like to buy two, one to replace in and one for a spare to prevent burning up the ABS ECU and other stuff I am planning on adding.
  16. jarhead1086

    ABS troubleshooting

    I bought one of the complete ABS kits after messing with mine for a while. I wasn't blowing fuses, just couldn't get the light off. It ended up being my wiring harness after trying a new ECU. My air lines were obviously man handled and I believe the original ABS harness was damaged during that...
  17. jarhead1086

    M939 ABS ECU failure point

    I think I am going to have at least one extra ABS ECU when I am done getting mine working. You could try it to troubleshoot and buy it and keep it if it works. My alternator works fine, but it had electrical wire splices when I got it, so I am keeping eye on it. My voltage is steady for now. I...
  18. jarhead1086

    And the day began with such promise!!! 8-}

    My cooling system was nasty. At least your coolant looks clean even though its the wrong color. I pulled my radiator and surge tank and had them descaled and resealed. I replaced many of my hoses since the steel stiffeners in the elbows had rusted into pieces. I found a free shop rag in my...
  19. jarhead1086

    M939 No Spring Brake Ops - and...wow...

    I took mine apart and they looked like new except for the cooked grease from the air lines being installed wrong. I am always amazed when I hear stories like this and what I went through and they still make it to point B. I found rotted semi circle springs in the elbows coming off my oil cooler...
  20. jarhead1086

    Weekend project: M931A2 straight pipe

    I have been wanting to go straight pipe to the rear so when I start it in the garage it blows out the open door as well as for the reduced restriction. I am hearing rumors of mandatory emissions and having mufflers required on diesels for Northern Utah guys like us Mntsnow. I would hate to buy...
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