Collection
Where it applies, we arrange collection of your equipment or component at no charge.
24-Hour Rush Repair
Fontana, CA · Diesel engine repair
Diesel Engine Repair in Fontana
This shop built its reputation on diesel engines: in-frame and out-of-frame rebuilds, cylinder heads, fuel systems, turbos and aftertreatment — covering truck engines from Cummins, Detroit, CAT, PACCAR and Power Stroke, and equipment diesels from Caterpillar, Komatsu, Kubota, Yanmar and Deere alike. Machining happens in-house, every finding gets measured and documented, and no rebuild begins until you have a written quote in hand and have approved it.
Fontana, CA · Diesel engine repair
The engine jobs that fill our week
In-frame rebuilds complete with liners, pistons and bearings verified by measurement; cylinder head servicing and machining; head gasket failures diagnosed down to the root, including the cooling or EGR problem hiding behind them; high-pressure fuel systems and injectors; turbocharger fault-finding; diagnosis of oil consumption, blow-by and low power; and DPF and SCR aftertreatment faults and derates traced from one end to the other. An engine works as a system, so we repair it as a system.
Makes we work onCaterpillarKomatsuJohn DeereCaseBobcatKubotaCumminsPeterbiltKenworthFreightliner
Diesel Engine Repair in Fontana · Fontana, CAReal rebuild depth, fully documented
Measurement is what separates a rebuild from a mere repair. Blocks, crankshafts, heads and liners all get measured, and those numbers are shown to you alongside photos and video before you decide anything. Pick-up and delivery are free when applicable; we are open Monday–Friday 6 AM–5 PM, and the 24-hour rush line runs every day of the year.
- Diesel rebuilds, in-frame and out-of-frame
- Work on cylinder heads and head gaskets
- Injectors and high-pressure fuel system work
- Turbocharger fault-finding and replacement
- Tracing faults through aftertreatment and derates
How a repair moves through our shop — eight steps
From your first phone call through final testing, this is the route every job follows before it goes back into service.
Inspection
We take the unit apart and assess the full extent of the failure.
Photo & video record
Condition and findings get recorded, so the repair conversation stays clear and honest.
Written quote
The work we recommend gets defined and priced before anything proceeds.
Your approval
Scope, urgency and the sensible way forward get confirmed with you.
Making & rebuilding
Components get machined, welded, rebuilt or reverse-engineered as the job requires.
Testing
Operation and workmanship are verified before anything is released.
Return
The finished component or machine goes back into service with you.
Questions customers ask us
What diesel engines do you take on?
We handle Cummins, Detroit, Caterpillar, PACCAR and Ford Power Stroke, plus equipment diesels from Komatsu, Kubota, Yanmar, John Deere and others.
How can I tell whether my engine needs a rebuild or just a repair?
We measure before we advise — compression, blow-by, oil analysis where it helps, and what the teardown shows — then, where both paths genuinely exist, we quote both of them honestly.
Do equipment engines come to you too, or only truck engines?
They do — the engine bench covers truck and equipment diesels alike, all under the same measure-first, fully documented process.
More services from our shop
Truck down right now? Reach the around-the-clock rush line.
(949) 400-2937Book a service visit or start a repair order
Ask for a service visit.
Tell us the make and model, what the truck is doing, where it sits, how urgent it is, and when you would like us there. The form opens everything as a text message to John, so you can check it over before you hit send.