SERVING SAN ANTONIO & SOUTH TEXAS FOR 50+ YEARS

Machine Repair Tools on a Wall

Duffin Diesel Services 

Duffin Diesel offers full-service repairs and maintenance for diesel engines up to CAT 3412. Duffin Diesel’s expert mechanics provide a wealth of experience and knowledge to best serve our customers. 

Duffin Diesel Specializations

Keeping up with the latest trends in engine repair machinery, Duffin Diesel continuously updates equipment to satisfy the ever-changing diesel engine. Our 3-Axis CNC Rottler EM79 performs boring/sleeving, surfacing, and crankshaft main line boring. Duffin Diesel is the Central Texas machine shop that specializes in Cummins ISX / QSX / KT19, Caterpillar 3400 series and Detroit Diesel engines. Duffin Diesel repairs cracked counterbores, deteriorated uppers and lower receivers and will bring your diesel engine block to OEM specs.

Cylinder heads are the backbone of the diesel industry, and we specialize in ALL of them. Duffin Diesel performs total reman machining, Injector cup replacement, valve seat repair, resurfacing, crack detection and much more.

Common Diesel Heads

  • Cummins ISX SOHC / DOHC
  • CATERPILLAR 3406E/C15/C15 ACERT
  • DD60, DD13, DD15
  • JD6125, JD6135
Diesel Engine Block Being Repaired

Diesel Engine Block Repair Services

A diesel engine block is the backbone of any engine. The engine block protects all of the engine’s lower components. There are several steps that can be taken to protect your engine block and to keep its complex machine components safe.  

The trained diesel engine experts at Duffin Diesel provide the following Diesel Engine Block Repair Services: 

  • Engine Block Sleeving  
  • Engine Block Upper Repair Sleeving 
  • Engine Block Lower Repair Sleeving 
  • Engine Block Counterbore Repair
  • Engine Block Surfacing  
  • Engine Block Magnaflux  
  • Engine Cylinder Bore and Hone   
  • Engine Align Line Bore Repair  
Diesel Engine Cylinder Head

Diesel Cylinder Head Repair Services

Your engine’s cylinder head houses your intake valves, exhaust valves and houses the fuel injector. This powerhouse of the diesel engine requires skilled repairs and dedicated service to ensure your diesel engine works as hard as you do. 

The highly skilled diesel engine experts at Duffin Diesel provide the following Diesel Cylinder Head Repair Services: 

  • Diesel Cylinder Head Magnaflux  
  • Diesel Cylinder Head Pressure Testing 
  • Diesel Cylinder Head Injector Tube Repair 
  • Diesel Cylinder Head Seat Installation 
  • Diesel Cylinder Head Valve Guide Repair  
  • Diesel Cylinder Head Resurfacing   
Diesel Engine Block

Diesel Crankshafts Repair and Maintenance Services

Diesel crankshafts power the engine’s pistons. These powerful steel engine components are the backbone of the engine. Crankshaft repairs are a key aspect of maintaining your diesel engine and should be repaired by trained engine mechanics to ensure proper function and calibration of the parts.

Our diesel engine technicians provide the following Diesel Crankshaft Repair Services: 

  • Diesel Crankshaft Magnaflux Inspection  
  • Diesel Crankshaft Grinding 
  • Diesel Crankshaft Polishing 
Diesel Engine Block

Diesel Connecting Rods Repair Services

The connecting rods power the entire engine by converting linear movement into circular movement to power the crankshaft. Connecting rods do a majority of the heavy lifting when it comes to powering your diesel engine and need regular repair and maintenance to ensure your engine keeps working for as long as possible.

Our diesel engine technicians provide the following Diesel Connecting Rod Repair Services and Maintenance Options: 

  • Diesel Connecting Rod Big End Resizing  
  • Diesel Connecting Rod Rebush and Pinfit Small Ends Resizing 
  • Diesel Connecting Rod Alignment Confirmation