Kohler's New 134-hp Tier 4F Diesel Engine Needs No DPF | Construction News

Kohler Engines recently expanded its popular line of Kohler Direct Injection (KDI) diesel engines by introducing the Kohler 3.4 Liter KDI 3404 – a powerful engine designed for heavy-duty commercial applications requiring enhanced power and torque.

The KDI 3404 meets the EPA Tier 4 Final emission standards without needing a diesel particulate filter (DPF), thanks to its clean combustion and optimized fuel consumption.

“The KDI 3404 significantly broadens our ability to meet the power requirements of OEMs and end users,” said Jeff Wilke, product manager for diesel engines at Kohler. “The KDI 3404 is an impressively compact engine that delivers maximum power and torque while reducing fuel consumption and emissions. This is the most powerful engine we’ve ever manufactured – it’s an ideal power source for larger commercial applications in the construction, industrial, and agricultural markets.”

Kohler’s KDI line, which now includes eight engines, achieves Tier 4 Final emission compliance without a DPF due to a number of innovative design features, including Kohler’s direct injection system, cooled exhaust gas recirculation (EGR) and diesel oxygenated catalyst (DOC). A high-pressure common rail system (CSR) is also integrated, which uses 29,000 psi of pressure to better atomize fuel, reduce fuel consumption, and reduce emission particulates. All of these advancements are delivered in a compact engine that will fit existing and new equipment. 

The KDI 3404 is available in four ratings from 74 to 134 hp. with peak torques from 276 to 369 lb. ft. To enhance power and torque, the engine’s electronic control unit (ECU) monitors and manages power output in varying conditions by injecting fuel multiple times during the combustion cycle.

The engine's compact, lightweight design and the absence of a DPF give equipment manufacturers more flexibility in design and engine integration. End users also benefit from reduced maintenance, better heat management, and better fuel efficiency.

“When we introduced our KDI line in 2012, we brought a number of innovations and technologies to the marketplace,” Wilke said. “The line has received widespread acceptance among equipment manufacturers and end-users worldwide, which prompted the extension. With the launch of the new 3404, Kohler now offers a KDI solution ranging from 41.5 hp. to 134 hp.”

The KDI 3404 is available in either a mechanical or electronic engine and is manufactured in the Kohler Engines diesel production facility in Reggio Emilia, Italy.