258870 - Miller Replacement Kubota D902 Diesel Engine with Electronic Governor

Miller 258870 Replacement Kubota D902 Diesel Engine

The Miller 258870 is a complete replacement diesel engine assembly designed specifically for Miller engine-driven welding machines. This unit features the robust Kubota D902-E4B, a 3-cylinder, liquid-cooled industrial diesel engine known for its reliability and longevity in harsh job site environments. As a Tier 4 Final compliant engine, it meets modern emissions standards while delivering the torque and power required for heavy-duty welding and generator applications.

A critical feature of this specific assembly is the integrated Electronic Governor. Unlike traditional mechanical governors, the electronic system monitors engine speed with high precision and adjusts fuel delivery instantly to maintain constant RPM under varying loads. This is essential for welding generators, as it ensures stable voltage and frequency output, directly translating to a smooth, consistent welding arc and safe operation of auxiliary power tools. The engine is pre-configured with the necessary mounting points and interfaces to drop directly into compatible Miller chassis, minimizing downtime during repairs.

This engine assembly is an OEM part, ensuring that all specifications—from the flywheel housing to the exhaust orientation—align perfectly with your existing Miller equipment. It is ideal for refurbishing older machines or replacing engines that have reached the end of their service life, restoring your welder to factory-fresh performance levels.