Big 3 Engines

Engines • Transmissions • Installation

Industrial engines · Generator sets

Diesel & Natural-Gas Generator Engine Builds

A generator-engine project starts with the complete set. Big 3 builds diesel and natural-gas engines for generator applications, with the engine specification matched to the unit you are repairing.

East Texas shop · Nationwide freight by quote · Visits by appointment

Generac, Olympian, Cat and other inquiries

Send the generator-set tag alongside the engine tag. We review the installed engine rather than assuming the generator brand identifies its engine manufacturer. Include Cummins, Perkins or Chevrolet/Ford engine identifiers where applicable.

Engine build versus complete genset repair

Define the engine assembly, controls, fuel equipment, cooling package and generator coupling in the quote. Alternator work, electrical controls, load-bank testing, removal and installation are separate scope questions; an engine quote does not automatically include them.

A useful quote starts here

Send the engine tag and equipment details.

  1. Generator make/model, set serial number, rated kW, frequency and operating RPM from the tags.

  2. Engine manufacturer, model, serial number and actual fuel type.

  3. Standby or prime use, run hours, failure diagnosis and components being reused.

Compare the whole job.

Assembly & scope

Confirm the machining, internal components, external equipment and test or commissioning responsibilities in writing. Engine work and complete-machine repair are different scopes.

Core & freight

Confirm whether exchange is required and whether a deposit is included or separate. A core must match the purchased engine and be rebuildable to receive credit. Freight and unloading arrangements are confirmed for the order.

Read core requirements →

Schedule & warranty

Agree on the build or supply schedule and the written coverage for your exact order. Inspection, parts availability and confirmed scope affect timing. Review the oil, maintenance and warranty requirements before use.

Review warranty information →

Questions before you commit

Can I order from the model name alone?

No. The engine tag and equipment tag identify different parts of the application. Include both, along with fuel and operating details.

Is every engine shown ready to ship?

No. A guide describes an inquiry path. Current stock, build acceptance, price and lead time are confirmed for your specific order before payment.

Can you handle a natural-gas engine?

Yes. Big 3 builds natural-gas engines for industrial applications. Send the engine and equipment identification, fuel-system details and operating requirements for a build-specific quote.

Does this include the whole machine or site work?

The engine build is the starting scope. Removal, installation, generator electrical work, pump work, field service and commissioning are included only if specifically agreed in your quote.

Put the next step in motion

Let’s scope your engine.

Have your identifiers and diagnosis ready. We’ll work through the assembly, core, freight and the next step with you.

Brand and equipment names identify applications for inquiry. Big 3 is an independent engine builder; this page does not claim manufacturer affiliation or authorization.