About Diego's Machine Shop
Diego's Machine Shop is a family-owned automotive machine shop in Riverside, California, run by José Diego and built on more than 20 years of hands-on engine experience. Since opening our doors in 2019, we've specialized in the precision machine work — engine rebuilding, cylinder head resurfacing, hot tank cleaning, and piston service — that keeps engines running strong. Repair shops and car owners across the Inland Empire trust us to do that work right.
Meet José Diego
Behind Diego's Machine Shop is José Diego, who brings more than 20 years of hands-on engine experience to every job. When you bring in your engine, you work directly with the person whose name is on the door — not a stranger you'll never meet. José Diego built this shop on a simple idea: do honest, precise work, and treat every customer's engine like it's your own. That's the standard every job is held to.
A Family-Owned and Operated Machine Shop
Diego's Machine Shop is proudly family-owned and operated. Since 2019, José Diego has built the shop alongside his family, with the next generation working right beside him. That family approach is exactly why customers keep coming back: when it's your family's name and reputation on every engine, you do the work right. Here you're not a number — you're a customer we want to keep, and a neighbor we'll see again.
Over 20 Years of Engine Experience
Engine work isn't something you learn overnight. José Diego brings more than two decades of mechanical experience, and the shop has operated as a full machine shop since 2019. We've built our reputation one engine at a time. That experience shows in the details — the right tolerances, the honest assessment, and the patience to do the job correctly instead of quickly.
A Machine Shop, Not Just a Repair Shop
Most shops in town are repair shops — when an engine needs real machine work, they have to send it out. We are that machine shop. We bore and hone cylinders, grind crankshafts, resurface heads, fit pistons, and rebuild engines in-house. That's what sets us apart, and it's why other shops bring their work to us. Alongside the machine work, we also handle everyday auto repair to keep your vehicle on the road.
How We Work
Our customers come back because of how we do business.
We take our time to do it right
Quality work over rushed work.
Honest and straightforward
We tell you what your engine actually needs.
Best option for your budget
No pressure, no upselling.
Free estimates
You'll know what you're looking at before any work begins.
Who We Serve
Proudly Serving Riverside & the Inland Empire
Based on Placentia Ln in Riverside, we serve drivers and shops across Riverside, Jurupa Valley, Rubidoux, Moreno Valley, Corona, and the greater San Bernardino area. As a local family business, we're proud to be a trusted machine shop for our community.
See our full service area →Get a Free Estimate Today
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.
Sat 8:00 AM – 2:00 PM · Sun Closed