Over-the-Road Truck Engine Machining & Rebuilding

Duffin Diesel provides heavy-duty engine machining and rebuilding services for trucking fleets, owner-operators, dealerships, and independent repair facilities throughout South Texas.

We understand that every day a truck is down costs money. Our goal is to provide precision machining, dependable quality, and fast turnaround times to help keep trucks on the road.

Common Engines We Service

Cummins

Detroit Diesel

DD13
DD15
DD16
Series 60

Paccar

MX-11
MX-13

Volvo

Mack

Our Services

Cylinder Head Rebuilding

Pressure Testing
Valve and Seat Repair
Guide Replacement
Resurfacing

Engine Block Machining

Boring and Honing
Deck Resurfacing
Counterbore Repair
Main Bore Alignment

Crankshaft Services

Grinding
Polishing
Inspection

Connecting Rod Reconditioning

Resizing
Bushing Replacement
Inspection

Complete Engine Rebuilding

Our machinists rebuild heavy-duty diesel engines to OEM specifications using industry-leading equipment and proven machining practices.

Why Choose Duffin Diesel

Family Owned Since 1970
Located in San Antonio, Texas
Over 200 Years Combined Machining Experience
AERA Member
Fast Turnaround Times
Precision Equipment Including Rottler EM79 and Serdi 4.5
Serving Fleets, Owner-Operators, Repair Facilities, and Truck Dealers Across South Texas

Supporting South Texas Fleets

Duffin Diesel works with customers throughout San Antonio, Austin, Laredo, Corpus Christi, Eagle Pass, and surrounding areas. Whether you are rebuilding a single engine or supporting an entire fleet, our team is committed to delivering quality machining and dependable service.

Contact Duffin Diesel

Need a quote on a Cummins, Detroit, Paccar, Volvo, or Mack engine?

Contact Duffin Diesel today to discuss your project and get your equipment back on the road.

OVER-THE-ROAD