Metal engine cylinder head on a workbench, showing valve springs and machined ports.
Mechanic hands installing a car engine sensor in an open hood bay

Diesel engines are powerful, efficient, and built to last but only when they receive the expert care they require. At Auto Tech Specialists in Billings, MT, we provide comprehensive diesel repair services for light-duty trucks, heavy-duty work vehicles, and everything in between. Our experienced diesel technicians understand the unique demands of compression-ignition engines and are equipped with diagnostic tools to identify problems fast and fix them right. Call (406) 839-9100 to schedule your diesel repair with the most trusted shop in Billings, MT.

Fuel Injector & Pump Repairs 

The fuel injection system is the heart of any diesel engine. When injectors become clogged, worn, or fail entirely, you will notice hard starting, rough idling, loss of power, or increased fuel consumption. At Auto Tech Specialists, we perform thorough fuel injector cleaning, testing, and replacement, as well as fuel pump diagnostics and repair. Restoring your injection system to factory specification helps your diesel run cleaner, more efficiently, and with maximum power output.

Close-up of shiny metal engine parts with bolts and hoses in a workshop setting

Signs Your Fuel Injectors Need Service

Watch for warning signs including black smoke from the exhaust, a drop in fuel economy, rough engine running, or a check engine light. If you notice any of these symptoms on your diesel vehicle in the Billings, MT area, do not delay; call Auto Tech Specialists right away.

Mechanic wearing gray gloves repairs a rusty engine in a workshop

Turbocharger Servicing & Replacement

The turbocharger is what gives your diesel engine its impressive pulling power. When turbo components wear or fail, you may experience a loss of boost pressure, excessive oil consumption, or loud whining noises under load. Auto Tech Specialists provides complete turbocharger inspection, servicing, and replacement. We work on a wide variety of turbo systems and can source high-quality replacement units to restore your diesel's performance to peak levels.

EGR and Exhaust Manifold Failures

The Exhaust Gas Recirculation (EGR) system is one of the most common sources of diesel engine problems. Carbon buildup, cracked coolers, and stuck EGR valves can cause overheating, rough running, and significant power loss. Our ASE certified mechanics at Auto Tech Specialists in Billings, MT, are experienced in diagnosing and repairing EGR valves, EGR coolers, and exhaust manifold cracks or leaks. We will restore proper exhaust flow and engine efficiency quickly and reliably.

Gloved hand holding a small car engine part in an open engine bay
Mechanic wearing white gloves working under a car’s open hood in a repair shop

Engine & Powertrain Services

When diesel engine problems go beyond routine repairs, Auto Tech Specialists has the expertise to handle major engine and powertrain work. From cylinder head repairs and head gasket replacements to full engine rebuilds and replacements, our technicians bring decades of diesel engine experience to every job. We also service powertrain components, including flywheels, flex plates, and engine mounts, to ensure smooth and reliable power delivery throughout your drivetrain.

Mechanic’s gloved hand working on an exposed car engine in a garage

Diesel Glow Plug Replacement

Cold Montana winters are tough on diesel engines, and a failing glow plug system can make starting your truck nearly impossible in low temperatures. Auto Tech Specialists provides glow plug testing and replacement to ensure your diesel starts reliably in Billings, MT winters. Do not get stranded in the cold let us keep your glow plug system in top shape year-round.

Mechanic’s gloved hands working on a car engine in a dimly lit garage

Your Billings Diesel Repair Specialists

Auto Tech Specialists is Billings, MT's go-to shop for everything diesel. We combine deep technical knowledge with honest service and fair pricing to give diesel vehicle owners the best possible experience. Whether you are a weekend truck owner or rely on your diesel for your livelihood, we are committed to keeping your vehicle on the road and performing at its best.

Call (406) 839-9100 today to schedule your diesel repair appointment.