Our Services: Engine Machining & Auto Repair in Riverside, CA
Diego's Machine Shop combines true automotive machine shop work with everyday auto repair under one roof. We rebuild and machine engines to precise tolerances for repair shops and car owners across Riverside and the Inland Empire — and keep daily drivers running with honest, affordable service. Every job starts with a free estimate.
Precision engine machining is our specialty
The kind of work most repair shops have to send out. We do it in-house, to spec.
Engine Rebuilding & Machining
Complete, ground-up engine rebuilds and precision machining for cars, diesel, and motorcycles — including cylinder boring & honing, crankshaft grinding, line boring, valve jobs, and pressure/crack testing.
Learn more →Cylinder Head Resurfacing
We machine the cylinder head flat so the gasket seals correctly and stops leaks, overheating, and blown head gaskets.
Learn more →Hot Tank Cleaning
Deep, thorough cleaning of engine blocks and parts in our hot tank — removing grease, carbon, and rust so machining and reassembly are done on clean surfaces.
Learn more →Piston Service
Piston replacement and fitting, matched to your rebored cylinders for correct clearance and a durable rebuild.
Learn more →The everyday repairs that keep you on the road
Engine Diagnostics / Check Engine Light
Accurate diagnosis so you fix the real problem, not a guess.
Brake Service
Pads, rotors, and complete brake jobs.
Cooling System & Overheating Repair
Radiators, water pumps, and overheating fixes that protect your engine.
A/C Service & Recharge
Reliable air conditioning repair for Inland Empire summers.
Tune-Ups
Restore smooth, efficient performance.
Suspension & Steering
Shocks, struts, and front-end repairs for a safer, smoother ride.
Vehicles We Service
We work on a wide range of engines — domestic or import, daily driver or project build. Bring it in for a free estimate.
Who We Work With
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