Katolight D250 Generator — 250 kW Cummins NTA855 | OnPoint

Name: Katolight D250 (Cummins)
Brand: Katolight
Availability: PreOrder

Overview#

The Katolight D250 is a 250 kW diesel standby generator powered by the legendary Cummins NTA855-G3 — a 14.0-liter, six-cylinder inline diesel engine that has been one of the most widely deployed generator drive engines in North America. The NTA855 platform dates back to the 1960s and has earned a reputation for exceptional durability and straightforward serviceability that few modern engines can match.

Katolight is a discontinued brand, acquired by MTU (now Rolls-Royce Power Systems) in 2006 and rebranded as MTU Onsite Energy. No new Katolight units are manufactured. However, the combination of Katolight packaging with the Cummins NTA855 engine means these units have some of the best long-term serviceability of any legacy generator — Cummins NTA855 parts remain widely stocked by Cummins distributors, independent suppliers, and rebuilders nationwide.

OnPoint provides full maintenance, repair, and overhaul services for Katolight D250 installations. The NTA855 engine is one we know extremely well, and we can keep these units running reliably for decades with proper preventive maintenance and timely component replacement.

Estimate runtime for the Katolight D250 (Cummins)

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

14.8 hours(0.6 days)

Fuel consumption ≈ 13.50 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Katolight D250 (Cummins) under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter

Every 500 hours or 12 months

Coolant change

Every 6000 hours

Air filter

Every 1000 hours

Fuel filter

Every 500 hours

Major overhaul

≈ 20,000 hours

Load bank test

Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

Component	Symptom	Typical hours	Severity
Fuel quality / degradation	Hard starting, filter clogging, reduced power	4,380+	moderate
Turbocharger	Power loss, excessive smoke under load	12,000+	moderate
Battery	Failed to start, slow crank	8,760+	minor

Frequently Asked Questions

Are parts still available for the Katolight D250 with Cummins NTA855?

Yes. The Cummins NTA855 is one of the most widely deployed generator engines in North America, with parts available from Cummins distributors, independent suppliers, and engine rebuilders nationwide. This gives the Katolight D250 some of the best long-term serviceability of any legacy generator.

Can the Katolight D250 engine be overhauled?

Yes. The Cummins NTA855 engine is well known for its rebuildability. OnPoint provides full major overhaul services including liner and piston replacement, cylinder head reconditioning, turbocharger rebuild, and fuel system service. Properly overhauled, these engines can deliver another 20,000+ hours of service.

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Katolight D250 (Cummins)