· i have m816 with the trusty 250 cummins. The belt from the crank to the waterpump has no adjustment and i cant figure out how this comes off/on. They did make small cams in the 400hp range though. You add more stress on the camshaft when you turn up the rail pressure. I got the new o-rings but i need to know the torque specs for the injectors. I have a few bad injector o-rings since i am getting fuel into the oil. · on idaho motor pools web site (where i have been shopping, cause its close to my place) it says nhc 250 cummins on all the 5-ton trucks (dump trucks, tractor rigs, and wreckers), all the listings for the m35a2s just say turbo diesel. How can i find out how old this is and when it was made? So, after killing lots of bugs and sending a few prius drivers in the other direction, i … · nhc250 valve injector overhead adjusting many of my fellow haspin rally attendees know that my m818 was quite smokey and running a little rough. Any guidance/tips from those who have done it would be greatly appreciated! Switch to a #15 or 17 plunger/fuel button. I have the manuals on cd and all i can find is torque specs for the heads then the rocker arm towers. . May the forum gods have mercy on me, searching on tapatalk is a pita! · cons – parts availability, starts better than the nhc-250 in cold weather but still needs a sniff of ether ive had both nhc-250-powered trucks (m929a1, m928a1, m932) and 6cta 8. 3-powered trucks (m936a2, m932a2 and now two m925a2s). I looked at the manual but it … I got all of them off except 1. · does anyone have the actual cummins service manual for the nhc 250, not the tm. While i love the 6cta 8. 3 motor, i would suggest that anyone who is interested stick with the nhc-250-powered. You can step up to 290-300 injectors only if you turn up ur fuel pressure. · hey, what are the recommended parts / tips / tricks when removing, cleaning, and re-installing the clogged fuel injectors on an nhc-250? · if you swap over to a civilian nhc-250 alternator mount (cheap at truck salvage yard), which will likely be a j-180 short (4 between double ears), it should also give you a lot more options for lower cost and more reliable civilian stuff. · the nhc 250 does not have piston coolers, so you will not be able to run it hard. · my 5 ton m927 has a cummins engine serial: · i am in the process of replacing all the belts on my 5 ton with a cummins nhc 250 engine.