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More Power From NHC 250 in M939 Series Trucks With Allison Transmissions
https://quickserve.cummins.com/qs2/pubsys2/xml/en/procedures/18/18-005-024.html?q=+category:service language:en^2 005-024 Fuel Pump Fuel Rate with Throttle Shaft PlungerTable of Contents Adjust Adjust TOC To raise or lower the fuel rate, the ball must be removed from the...- Hasbeen
- Post #57
- Forum: 5-ton Mods and Hot Rodding
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More Power From NHC 250 in M939 Series Trucks With Allison Transmissions
The "business" end of the fuel pump is the small "cone shaped" cover on the lower rear with four attaching bolts. Under the cover is a cylindrical tube that houses the orfice or "button" that controls the fuel "rail pressure", and the shims that govern the r.p.m. the buttons are marked with a...- Hasbeen
- Post #13
- Forum: 5-ton Mods and Hot Rodding
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More Power From NHC 250 in M939 Series Trucks With Allison Transmissions
The 350 and400 engines are "NTC" family of 855 Cummins engines. They were configured as "Power Torque", "Formula", and "Fleet" designations, in a variety of horsepower, rpm ranges, and torque curves depending on performance, driveability, or fuel economy. Horsepower ranges...- Hasbeen
- Post #9
- Forum: 5-ton Mods and Hot Rodding