Pick-up
Coordinate free equipment or component pick-up when applicable.
24-Hour Rush Repair
Diesel engine repair · Fontana, CA
Diesel Engine Repair in Fontana
Diesel engines are where this shop's reputation is earned: in-frame and out-of-frame rebuilds, cylinder heads, fuel systems, turbos and aftertreatment — for truck engines (Cummins, Detroit, CAT, PACCAR, Power Stroke) and equipment diesels (Caterpillar, Komatsu, Kubota, Yanmar, Deere) alike. Machining is in-house, findings are measured and documented, and no rebuild starts without a written quote and your approval.
Diesel engine repair · Fontana, CA
Engine work we do every week
In-frame rebuilds with liners, pistons and measured bearings; cylinder head service and machining; head gasket failures diagnosed to the root (including the cooling or EGR cause behind them); high-pressure fuel systems and injectors; turbocharger diagnosis; oil consumption, blow-by and low-power diagnosis; and DPF/SCR aftertreatment faults and derates traced end to end. An engine is a system — we repair the system.
Brands we serviceCaterpillarKomatsuJohn DeereCaseBobcatKubotaCumminsPeterbiltKenworthFreightliner
Diesel Engine Repair in Fontana · Fontana, CARebuild depth, documented
The difference between a repair and a rebuild is measurement. Blocks, cranks, heads and liners are measured and the numbers shown to you with photos and video before you decide. Free pick-up and delivery when applicable; Monday–Friday 6 AM–5 PM, with the 24-hour rush line running every day of the year.
- In-frame and out-of-frame diesel rebuilds
- Cylinder head and head gasket work
- Injectors and high-pressure fuel systems
- Turbocharger diagnosis and replacement
- Aftertreatment and derate fault tracing
Our 8-step repair process
A clear path from the first call to a tested component or machine returned to work.
Inspection
Disassemble and evaluate the complete failure.
Photos & video
Document condition and findings for a clear repair conversation.
Repair quote
Define the recommended work and quote before proceeding.
Approval
Confirm scope, urgency and the practical path forward.
Manufacturing
Machine, weld, rebuild or reverse engineer required components.
Testing
Verify operation and workmanship before release.
Shipment
Return the completed component or equipment to service.
Frequently asked questions
Which diesel engines do you repair?
Cummins, Detroit, Caterpillar, PACCAR, Ford Power Stroke, and equipment diesels from Komatsu, Kubota, Yanmar, John Deere and others.
How do I know if my engine needs a rebuild or a repair?
We measure first — compression, blow-by, oil analysis where useful, and teardown findings — then quote both paths honestly when both exist.
Do you work on equipment engines as well as truck engines?
Yes — the engine bench covers truck and equipment diesels alike, with the same measure-first, documented process.
Related services
Emergency breakdown? Call the 24-hour rush line.
(949) 400-2937Schedule service or open a repair order
Request a service call.
Include the make, model, symptoms, location, urgency and preferred service time. Your details open in a text to John so you can review them before sending.