Diesel Engine Repair & Overhaul

Diesel semi-trucks with hoods open for engine repair at Green-Oval Truck Service in Krum, TX

Diesel Engine Repair & Overhaul in Krum & Denton, TX

When a diesel engine starts running rough, losing power, or throwing warning codes, you need a shop that actually understands heavy-duty diesel systems. Green-Oval Truck Service provides comprehensive diesel engine diagnosis, repair, and overhaul services for Class 6 through Class 8 trucks in the Krum and Denton area.

Engine Diagnostics

We use up-to-date diagnostic equipment to pinpoint the root cause of engine issues — not just clear a check-engine light and hope it doesn’t come back. That means faster, more accurate repairs and fewer repeat visits.

In-Frame & Out-of-Frame Overhauls

  • In-frame overhauls: rebuilding key engine components without removing the engine from the chassis
  • Out-of-frame overhauls: complete engine removal and rebuild for more extensive wear or damage
  • Replacement of pistons, liners, bearings, gaskets, and other major wear components

Common Issues We Diagnose & Repair

  • Loss of power or poor acceleration
  • Excessive smoke or unusual exhaust color
  • Oil consumption or leaks
  • Rough idle, misfires, or hard starting
  • Electrical and sensor-related engine faults

Engines & Brands We Service

Fleet owners and owner-operators across Krum, Denton, and North Texas trust us with Cummins diesel repair, Powerstroke repair, Duramax repair, and Detroit Diesel engine service. Whether you drive a Class 6 or Class 8 truck, our technicians know these engines inside and out.

If your diesel engine isn’t performing the way it should, don’t wait for a bigger problem.

Call 817-470-0604 to schedule a diagnostic at our Krum, TX shop.