The NNKH channel specializes in bringing forgotten machines back to life. This time a 1978 Kenworth K100 cabover showed up in the yard. A truck bought for just a thousand dollars that had been sitting unused for decades.
Last registered in 1986, though it somehow passed inspection in 1995. Matt, the previous owner, kept it in a backyard full of old vehicles. Right next to another K100 riddled with bullet holes and piles of vintage parts.
Initial inspection shows the frame is surprisingly solid for its age. Aluminum bumper, copper-brass radiator the size of a door, and indestructible battery boxes. Everything suggests this truck was built right.
Inside the cab lie a pair of 70s-era night driving glasses, and most gauges on the dashboard still work. Under the hood sits a Cummins NTC 350 with a PT pump and ten-speed direct drive transmission.
Problem is, the hydraulic system for tilting the cab leaks. Fuel tanks are rusted through, and air brake lines are brittle as crackers.
The revival process starts with swapping old diesel for clean fuel from an auxiliary tank and fresh filter. The cab hydraulics demand gallons of ATF and repeated bleeding before the cab finally lifts enough to access the engine.
The old starter barely turns, but after hooking up three batteries and cleaning the terminals, everything suddenly spins faster. After a few attempts, with the starter buzzing, the Cummins lets out a raspy cough. It spits a cloud of black smoke and starts running. First on five cylinders, then more smoothly.
Oil pressure jumps to 60 PSI, the fan starts spinning, and temperature slowly climbs.
The data plate shows the truck has nearly 956,000 miles on the odometer. It weighs over 15 tons and is rated for 49,000 pounds gross vehicle weight.
The clutch works, transmission shifts through gears without trouble. After releasing the parking brakes, the wheels finally break free. Moving for the first time in years.
The Kenworth gets disconnected from the trailer and driven back and forth a few dozen feet, leaving deep ruts in the mud. It’s not road-ready. Needs tires, brakes, air lines, and countless small fixes. But as a yard jockey for moving trailers around the property, it works perfectly.
If you were the next to turn a wrench on this K100, would you start with the cab lift pump or dive straight into the air system rebuild?
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A locked Cummins, a frozen cab, and a tree growing through the frame make this 4070 revival one brutal challenge.