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  1. WillWagner

    Cummins 855 535hp Rated

    If you ain't using the truck to pull 80k on a regular schedule, 200-210 will be ok, short trips, parades won't hurt it, BUT, higher than specified rail pressure will break cam follower shafts, roller pins and compromise injector lobes in a very short time. And, if you don't catch the failure...
  2. WillWagner

    Cummins 855 535hp Rated

    It's a morphadite. BC3 and 4 mixture. Used a bc4 oil system, step timing control, bc3 aftercooler, conventional cooling instead of low flow cooling like the bc4. These are rated at that power because they are only used part time and not for prime power, long term running, most likely coupled to...
  3. WillWagner

    Need a replacement oil cooler recomendation

    The one it comes with works fine. You could add an external one if you wanted to, but there i s no need to do so.
  4. WillWagner

    M925a2 running rough

    Sounds like a plugged filter, something in the tank sucking up on the suction tube or air, I doubt air though. Don't care if the filters are new, if you got crap fuel or something downstream let go and got into the filter, they are just doing their job. They are the sacrificial lamb of the fuel...
  5. WillWagner

    Changing out the coolant on the NHC250

    Dude, if you have the tools and can time it WHY would you take it to a shop to set the overhead? And it is Cummins. Cummings, she was a **** star, Carol Cummings. http://www.imdb.com/name/nm0191860/
  6. WillWagner

    M939 Jake Brake and Allison Questions

    None of the switches/wiring are there, you need to buy, install and wire it. The brakes you have are likely 12 volt, switches don't matter, but you will need to buy 24vdc solenoids for the brakes. I can scan a foot pedal diagram for you later tonite.
  7. WillWagner

    M939 Jake Brake and Allison Questions

    Here.... Oh yeah, the part numbers for the switch is...Jacobs, 003951 and Cummins, 3871305. OR a 100 PSI, NO switch. Allison never said the use of the off the shelf, generic switch was OK to use, but we used them all the time, sorry, do not have a generic p/n for one, it has been WAY too long...
  8. WillWagner

    M925a2 Power Surge

    Negatory Ghost Rider. You vintage is a single valve cover....they ALL are...The breather is a small one off the top
  9. WillWagner

    M939 Jake Brake and Allison Questions

    Easy peasy, wire it from keyed B+ source to the pump switch, out of the pump switch to the Allison pressure switch installed in the lock up port on the trans body, IIRC, Jake sells one too, I will see if I can dig up the p/n, to the 3 position switch and from there to the brake housings. I have...
  10. WillWagner

    Changing out the coolant on the NHC250

    ELC is bad juju for old engines. Rubber parts WILL be compromised. Stick with a low silicate, normal glycol antifreeze.
  11. WillWagner

    Catastrophic Failures

    I forgot about this, I have a boat load more pics. Leme see if I can dig some up.
  12. WillWagner

    M923 engine noise

    There is no need to time the compressor. If you pull the accessory drive, now that requires to be put in time of sorts. There wil be no performance issues but if/when you set the overhead, it will be wrong.
  13. WillWagner

    Passenger side tire cupping

    You all also need to remember, once tires start wearing in one manner, the wear will continue in that manner even if the issue is repaired unless new rubber is installed.
  14. WillWagner

    1991 M923A2, Cummins 8.3 higher than usual oil pressure, and oil leak question

    Oil filter will not cause higher that "normal" oil pressure. As Simp said, verify the gauge first. Next will be the pressure regulator in the oil cooler housing, it is probably scored and sticking, could be from the high coolant temp issue, the housing is aluminum and the plunger is steel. Just...
  15. WillWagner

    Need help diagnosing a miss

    If you don't have anIR gun, use a spray bottle and water. Cold start idling, spray each port at the manifold, watch to see which one(s) do not dry or are slow to dry, it is normal for 1 and 6 to be the last to dry, but they usually do about the same time. the one(s) that don't dry up are your...
  16. WillWagner

    Cummins 2.8 Repower ??

    The engine will be made to HAVE all the crap on the back of it, no way around it unless someone comes up with a hack calibration. You will be able to run it w/o the stuff until the system sees no aftertreatment, then you get 1000 RPM/5 mph
  17. WillWagner

    M925a2 Power Surge

    ECM Should be GTG for 24v. You will need another lift pump. No Carter pump, it is a piston type and mounted behind the ECM....change it BEFORE you install the engine!
  18. WillWagner

    M934a2 sluggish low rpm performance

    Get a second body. Use a socket, extension and a breaker bar to hold the turbo shaft from spinning, start the engine, use starting fluid LIGHTLY at all of the intake joints, the aftercooler inlet and outlet, crossover hoses, etc. If there is a leak to atmosphere, the starting fluid will find it...
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