Diesel Engine Machine Shop in San Antonio

Since 1983, South Houston Engine has been dedicated to providing exceptional service to San Antonio residents, Texans, and clients nationwide. Our diesel machine shop is fully bonded, licensed, and insured because your trust is invaluable to our locally owned and locally operated business. We only allow the most qualified, professional, and skilled individuals to join our team because we have such a stellar reputation to uphold – including an A+ Rating from the Better Business Bureau. Our commitment to excellence drives us to deliver top-notch craftsmanship in each diesel engine service because we strive to consistently surpass our customers’ expectations. Your peace of mind is invaluable to us, which is why we offer written warranties on all machine and engine work to ensure your confidence in our services. Reach out today to tell us all about your needs and learn firsthand what distinguishes us as a trusted name in the San Antonio community!

Diesel Engine Services

The critical importance of diesel trucks in our wonderful nation cannot be emphasized enough. They tirelessly deliver everything we need to make our daily lives more convenient, from clothing and food to cars and beyond. Traveling across various roads and highways, they experience significant wear and tear throughout their journeys. Their engines, in particular, are predisposed to breakdowns because of the constant demands placed upon them. Therefore, meticulous servicing is necessary to preserve top-tier performance and dependability for these engines. In situations where critical components of diesel engines fail, the solution usually entails repairing or replacing the engine. Diesel engine rebuilding service is our specialty at South Houston Engine, setting us apart as industry leaders. We’re thrilled to quickly return America’s esteemed truckers to the driver’s seat of their essential rigs and assist them in avoiding any disruptions.

Whether it’s the powerful V-12 Caterpillar or the humble 2-cylinder Kubota, our capable diesel engine repair technicians are ready to address your engine needs. Whether your engine is small and simple or large and intricate, we’ll customize our approach to meet your needs. We differentiate ourselves from brokers and resellers by specializing in the direct diesel engine remanufacturing and engine production with a distinct, hands-on approach. The engines passing through our diesel engine machine shop showcase the painstaking craftsmanship applied to each component. Understanding the pressing need to have your diesel truck operational, we provide nationwide shipping at discounted freight rates by passing our cost savings on to you.

When reassembling the engine, we rigorously enforce quality controls to ensure that it meets or surpasses the standards set by its original factory specifications. We ensure top-notch quality through extensive testing protocols performed before the engine is released to guarantee its reliability and performance. Each phase of the process is expertly handled by our specialists, from thorough cleaning and detailed inspections to precise machining and meticulous reassembly. With our comprehensive written warranties, you can trust that all the services we provide are fully covered and have full confidence in our work. Trust our proficient team to handle any diesel engine task, whether it’s a comprehensive overhaul or routine maintenance.

Jet Spray Cleaning

Utilizing powerful jets of water or solvent under pressure, jet spray cleaning effectively removes dirt, grease, and oil from engine components. Ideal for sensitive components, it’s an excellent cleaning process frequently utilized before machining, inspection, or rebuilding.


Straightening ensures that components like connecting rods and crankshafts are free of bends, allowing for proper alignment and function. This process utilizes specialized equipment to return the component to its original form, thus improving engine performance and extending its lifespan.

Align Boring

Align boring restores proper alignment and dimensions to main bearing bores. This step is necessary for achieving peak performance and facilitating effortless crankshaft rotation. It is a vital component in attaining peak operational efficiency and facilitating frictionless crankshaft rotation. Its role in the diesel engine rebuilding process is to rectify both wear and misalignment for smooth engine performance.


Grinding involves refining or polishing surfaces, like cylinder heads or crankshafts, to eliminate flaws or meet exact specifications. Through this process, engine components can regain their ideal operation and performance.

Engine Block Rebuilding

During San Antonio engine block rebuilding, we disassemble, clean, inspect, machine the cylinder bores, and replace damaged components. The objective is to establish the durability and functionality needed to ensure consistent and effective operation.

Electronic Bolt Extraction

Electronic bolt extraction involves using specialized electronic instruments to release difficult, stuck bolts without causing damage to adjacent parts. These devices use vibration or controlled force, making them ideal for loosening overtightened or corroded bolts. They speed up repairs and lower the likelihood of damage to components during the rebuilding or disassembly processes.


Blasting, commonly referred to as “sandblasting,” utilizes forceful projection of abrasive materials onto engine parts to eliminate impurities. This method is commonly chosen to prepare parts for painting, coating, inspection, or rebuilding.

Crankshaft Rebuilding

Crankshaft rebuilding restores the critical rotating component of the engine. When we complete this process, we disassemble, clean, inspect, machine, and change out old, worn parts, such as bearings. The objective is to attain accurate sizing and equilibrium, which are crucial for achieving optimal engine functionality and durability.

Thermal Cleaning

Through the application of heat, thermal cleaning removes contaminants from parts like pistons and cylinder heads. By heating the parts to extreme temperatures, any buildup is effectively removed without the use of chemicals or abrasive materials. Employing this strategy ensures that components are suitably prepped for testing, rebuilding, or machining.

Connecting Rod Reconditioning

Connecting rod reconditioning involves disassembling, cleaning, inspecting, resizing, and replacing bearings as needed to ensure proper alignment and reduce vibration. This crucial measure greatly extends the engine’s lifespan and is vital for preserving its reliability and performance.


Milling is a machining technique that sculpts or transforms engine components by utilizing a rotating cutting tool to eliminate material. Ensuring creating indentations, consistent smoothness, or obtaining accurate sizes on components such as cylinder heads, crankshafts, or engine blocks is vital to meet specifications and enhance performance.


Honing is a meticulous technique utilized in diesel engine machining in San Antonio to refine cylinder walls and eliminate blemishes, such as scratches and ridges. This approach fosters excellent oil retention and ensures the piston rings are seated correctly, promoting superb engine performance and durability.


The act of polishing works to refine surfaces, improving their overall finish and reducing friction. It enhances the durability and effectiveness of parts such as crankshafts, cylinder heads, and camshafts.


Achieving balance ensures that the connecting rods, crankshaft, and pistons are all aligned precisely and have their weight evenly distributed. Its goal is to decrease vibration, diminish wear, and elevate both performance and endurance. Achieving balance might involve adjusting the distribution or positions of parts, which is imperative for ensuring consistent operation and prolonged service life in engine rebuilding or servicing tasks.

Counter Boring

Counter boring, an essential technique in San Antonio diesel engine machining, involves crafting recessed spaces to accommodate larger fasteners, bearings, or seals within components such as cylinder heads or engine blocks. Its purpose is to guarantee correct installation and operation, resolving concerns like compromised bolt holes or establishing smooth surfaces for injector sleeves or valve seats. It is indispensable for maintaining engine dependability.

Ultrasonic Cleaning

Utilizing ultrasonic technology, this cleaning method activates the cleaning solution through the agitation caused by high-frequency sound waves. Submerging engine parts like valves and injectors allows waves to reach deep crevices and remove carbon deposits or other impurities. Utilizing this strategy effectively revitalizes parts, ensuring optimal engine function and extended operational lifespan.

Pressure Testing

Pressure testing includes putting engine components, such as engine blocks or cylinder heads, through high pressure to detect weaknesses or leakage and verify their dependability and integrity. This is especially important for diesel engines, where good sealing is required for peak safety and performance.


The process of O-ringing involves the insertion of O-rings into either the cylinder head or engine block to bolster sealing. It is often implemented to stop combustion gas or coolant leakage.

Cylinder Head Rebuilding

To rebuild a cylinder head, it must be disassembled, thoroughly cleaned, inspected for damage, machined or resurfaced as needed, any worn-out parts must be replaced, and then it can be reassembled. It plays a crucial role in maintaining optimal engine operation, sealing reliability, and an extended engine lifespan.

Flywheel Grinding

Flywheel grinding, which uses specialized equipment, restores the smooth surface of the flywheel. It secures precise clutch operation, eliminates any chances of slipping, and ensures consistent reliability. It is common during clutch replacement or diesel engine rebuilding in San Antonio for performance upkeep.

Block Boring

Block boring is a diesel engine machining procedure used to refine cylinder dimensions and contour by eliminating flaws like scratches and scoring. This allows for the optimal sealing of piston rings, leading to enhanced engine durability and performance during overhauls or rebuilds.


Magnaflux takes a non-invasive approach to uncovering flaws or imperfections within metal components. This step involves magnetizing the object and then applying magnetic powder to reveal any flaws. When the metal surface is flawed, the powder gathers, aiding in the easy identification of any irregularities.

Crack Detection with Sonaflux

Through its innovative process, Sonaflux crack detection employs tailored procedures and ultrasonic waves to detect flaws in components like engine blocks or cylinder heads. This approach of non-destructive evaluation validates the strength of components, enabling quick repairs that mitigate serious disruptions and amplify engine capabilities.

Crankshaft Inspection

Inspecting the crankshaft involves a meticulous review to identify any indications of damage, wear, or deviation from correct alignment. Implementing this approach ensures the crankshaft’s durability and efficiency, which is paramount for prolonging the engine’s lifespan and optimizing its performance capabilities.


Specialized machinery is utilized in the surfacing process to mill engine parts like cylinder heads or engine blocks, ensuring a flawless and smooth finish. By creating a smooth and uniform mating surface for gaskets, this process eliminates flaws, ensuring effective sealing and peak performance. Achieving a smooth surface is vital for ensuring the reliability and efficiency of repairs or rebuilds.

Align Honing

Engine block major bearing bores are accurately aligned using align honing techniques. The process utilizes a honing machine to extract material, ensuring flawless alignment and concentricity. Frequently integrated into an engine overhaul or rebuild project, it resolves misalignments arising from improper assembly or wear. It also fosters heightened performance and prolonged durability by reducing friction.

Call South Houston Engine today at (713) 910-1212 and speak with one of our experts about how we can meet your diesel engine needs!