From complete engine rebuilds to brakes and diagnostics, Diego's Machine Shop is Riverside's trusted automotive machine shop — built for repair shops and car owners alike. With over 20 years of hands-on engine experience, we take the time to do the job right the first time. Free estimates, honest advice, fair pricing.
As a full automotive machine shop, we rebuild and machine engines to factory spec — work most general repair shops have to send out. Whether you're a shop sending us a head or a car owner with a tired motor, we deliver precise, reliable machine work.
Complete engine rebuilds and precision machining: cylinder boring & honing, crankshaft grinding, line boring, valve jobs, and pressure/crack testing.
Learn More →We resurface cylinder heads so they sit perfectly flat and the gasket seals every time — no more leaks or blown gaskets.
Learn More →Deep cleaning of engine blocks and components in our hot tank to strip grease, carbon, and rust before machining.
Learn More →Piston fitting, replacement, and matching to your rebored cylinders for the right clearance and a long-lasting rebuild.
Learn More →Beyond the machine shop, we keep everyday vehicles running strong with honest, affordable repair work.
We pinpoint the real problem before you spend a dollar on parts.
Pads, rotors, and full brake jobs done right.
Radiators, water pumps, and overheating fixes — before they turn into a rebuild.
Beat the Inland Empire heat with reliable A/C repair and recharge.
Keep your engine smooth, efficient, and dependable.
Shocks, struts, and front-end work for a safer ride.
Need a reliable machining partner you can trust with your customers' engines? We deliver accurate, on-spec work with fair wholesale pricing and dependable turnaround — so you can offer engine machining without sending jobs across town.
We explain what your vehicle actually needs, give you options for your budget, and never push work you don't need. Free estimates and straight answers, every time.
Quality work over rushed work — and an honest answer every time you bring us an engine.
A look at the engines, machining, and precision work that comes through our Riverside shop.
The themes customers raise most often in our Google reviews.
“They take their time to do a good job — you can tell the work is done right.”
“Excellent service and a fair price — exactly what you want from a machine shop.”
“Honest people who help you find the best option for your budget.”
Located on Placentia Ln in Riverside, we proudly serve drivers and shops across Riverside, Jurupa Valley, Rubidoux, Moreno Valley, Corona, and the greater San Bernardino area. Stop by, call, or message us for a free estimate.
Ready to get your engine back in shape? Call us, send a message, or stop by the shop in Riverside. Every job starts with a free, honest estimate.