Caterpillar 3306 Engine Specs: Horsepower, Displacement, Applications and Identification

A search for "Caterpillar 3306 engine specs" can return data from machine, truck, gen-set, marine and gas-engine references. Those are not automatically the same engine configuration. The safe way to use a 3306 specification is to identify the installed engine first, then match its plate and application to configuration-specific manufacturer information.

This guide explains what can be verified from current Cat sources, why horsepower, weight, dimensions, capacities and parts cannot be borrowed across versions, and how to collect a record that supports a correct parts inquiry.

Caterpillar 3306 engine visual reference. Identify the specific engine by its data plate, serial number and installed application before using a specification or ordering parts.

What Is a Caterpillar 3306 Engine - and Who Is This Guide For?

The Caterpillar 3306 designation is useful for narrowing a search, but it is not a complete engine record. Cat currently provides distinct parts paths for a 3306 machine engine, truck engine, gen-set engine and marine engine. Each path asks the user to add equipment or serial information before locating fitting parts. That is an important practical limit: broad model information helps research, while the serial and configuration control a component order.

This article is for equipment owners, technicians, rebuilders and buyers who need a safe starting point for 3306 identification. It is deliberately configuration-aware. Instead of copying a single online power or displacement number into every case, it shows which questions must be answered before a number becomes useful.

If your immediate job is a teardown, parts list or commercial rebuild inquiry, see our Caterpillar 3306 engine parts guide. It covers the evidence to gather for pistons, bearings, camshaft components, seals and overhaul-kit contents.

Caterpillar 3306 Quick Specs Table: What Is Verified and What Varies?

Why gas-engine figures are not diesel 3306 figures

Cat's current G3306B gas-engine page lists its own configuration: 10.5 L displacement, 122.92 mm bore, 152 mm stroke, 145-211 bhp at 1800 rpm, and stated dimensions, dry weight and liquid capacities. Those values are useful only when the engine being evaluated is that G3306B gas configuration. They are not presented here as "the Caterpillar 3306 diesel spec," and they must not be used to select diesel parts or establish a rating for another 3306 application.

This distinction is not a technicality. Fuel type, aspiration, governing, cooling, electronics, accessories, arrangement and installation can all affect the numbers a technician or buyer needs. A specification table without a configuration label can look precise while being wrong for the engine in front of you.

How to Identify the Correct Caterpillar 3306 Version

Start with a clear photo of the complete engine data plate. Capture every visible line, not only "3306." The complete serial number, model characters, arrangement or rating information and the installed application form the core identification record. A clear record allows a supplier or technician to ask focused questions rather than guessing from a general engine name.

• Data plate: photograph the full plate at readable resolution and retain every character, including a suffix or prefix.
• Serial and arrangement information: transcribe carefully and check uncertain characters against the original photo.
• Application: identify whether the engine is installed in a machine, truck, generator, vessel or industrial package, with wide installation photos.
• Old part evidence: photograph labels, stamps, cast numbers, connectors, fittings and mounting features before removing or discarding a part.
• Measurements: record bore, journal, bearing, repair-size or connection dimensions where the intended replacement requires them.

Do not use a casting number or a visual resemblance as a complete engine identification. It can be a helpful clue, but it does not replace the serial/arrangement record. Similarly, do not assume that an engine in a familiar type of equipment has the same rating or external configuration as another machine with a 3306 label.

Typical Applications and Operating Environments

Current Cat parts pages show that 3306 engines appear in machine, truck, gen-set and marine categories. Cat's 3306 machine-engine rebuild-kit information also lists a range of machine families associated with the engine model, including certain motor graders, excavators, wheel loaders, track-type tractors and other equipment. These are catalogue/application references, not a substitute for identifying a particular installed engine.

Operating environment changes the components around the core engine. Cooling layouts, air inlet and exhaust routing, fuel-system details, electrical connections, accessory drives, filter locations and service access may differ. Include wide installation photos alongside the data-plate and old-part photos whenever you request a turbo, pump, bearing, valve-train, gasket or external component.

Parts That Most Often Need Verification Before Ordering

Piston, ring, liner and cylinder group

Piston, ring and liner selection should follow the exact engine identification plus inspection. Compare the old piston's crown, ring-groove and pin details; retain readable references; and document cylinder condition and measurements. Do not use a general 3306 specification to infer an oversize, liner arrangement or ring design.

Main, rod and camshaft bearings

Bearing selection depends on the measured crankshaft or bore condition and required size. The active 3306 main and connecting-rod bearing listing identifies a STD product with reference 3285572. The active 3306 camshaft bearing listing identifies 8N8220 / 4W5739 references. Use these as live catalogue references only after confirming old markings, measurements and the exact engine configuration.

Real CAT 3306 camshaft-bearing product reference. Verify old markings, bore condition and engine configuration before selecting a replacement.

Gasket, valve-train, cooling, lubrication and fuel-system parts

Gaskets and valve-train components must match the specific engine and repair scope. Cooling, lubrication, fuel and air-system components should be checked against the installed arrangement, old part number and connection details. A current active 3306 valve seat page can support a valve-seat inquiry, but the final order still needs engine-specific verification.

Real valve-seat product reference. Match the actual part number, head evidence and configuration before ordering.

Parts-Ordering Checklist: Model + Serial + Evidence

If the evidence supports a complete rebuild package, the active CAT 3306 overhaul rebuild kit page is a relevant live catalogue starting point. Confirm the exact kit contents and their fit to the repair plan; a kit title should never replace serial, arrangement and component verification.

Real CAT 3306 overhaul-kit product reference. Verify contents against the data plate, work scope and teardown evidence.

FAQ: Caterpillar 3306 Specs and Identification

What are the key Caterpillar 3306 engine specs?

The correct answer depends on the exact machine, truck, gen-set, marine or other configuration. Use the plate, full serial number, arrangement and matching manufacturer information; do not rely on one generic horsepower or displacement claim.

How do I identify the correct Caterpillar 3306 version?

Use a complete data-plate photo, serial number, arrangement information where available, installed application, old component references and relevant measurements.

Where can I find the engine serial number?

Use the engine identification plate and photograph every readable field. Include the plate photo with any parts request rather than transcribing only a partial number.

What parts should I verify before ordering for Caterpillar 3306?

Verify piston/ring/liner group, bearings, gaskets, valve-train, cooling, lubrication, fuel and air-system parts against the exact engine and repair evidence.

Which rebuild parts are commonly replaced together?

The correct group depends on measured condition and repair scope. Compare an actual kit contents list to the components disturbed during the job; do not assume every engine requires the same package.

For a purchasing checklist that compares documented package contents with the repair scope, read our CAT 3306 rebuild kit buying guide.

Comparing the two families before a parts inquiry? Read our CAT 3306 vs 3406 comparison guide for the configuration checks that keep size, power, and rebuild-parts decisions separate.