Description
Tatan Machinery supplies professionally remanufactured Caterpillar 3306TA diesel engine assemblies (OEM part numbers: 125-2965, interchangeable with 1166725 / 1337225) engineered for CAT 330B and 330B L heavy excavators. Known globally as Caterpillar’s most legendary mechanical workhorse, this drop-in assembly is remanufactured strictly to OEM tolerances with 100% brand-new internal wear components. This page outlines first-party rebuild standards, workshop inspection criteria, diagnostic replacement symptoms, and critical installation protocols for quarry fleets and field repair shops.
Supplier Information & Build Status
| Supplier: | Tatan Machinery (Professional Excavator Parts Supplier) |
| Product Category: | Diesel Engine Assembly / Excavator Engine Parts |
| Engine Model: | Cat® 3306TA Turbocharged Aftercooled Mechanical Diesel |
| OEM Reference: | 125-2965 (Alt: 1166725, 1337225) |
| Product Build Condition: | Professional Remanufactured to OEM Specs (Heavy Structural Core + 100% Brand-New Wear Components) |
| Other Parts Condition: | All other excavator components on our site (Hydraulic Pumps, Main Valves, Swing & Travel Motors) are 100% Brand New. |
| Target Machine: | CAT 330B / CAT 330B L Heavy Hydraulic Excavators |
🏢 Tatan Machinery Engine Staging & Workshop Facility
Physical inventory storage, heavy engine remanufacturing staging, and pre-export testing facility:
Physical inventory — ready for global crating. Video calls and warehouse visits welcome.
Technical Specifications
| Parameter | Specification Data |
|---|---|
| Displacement | 10.5 Liters (638 cu in) |
| Cylinder Configuration | Inline 6-Cylinder, 4-Stroke Mechanical Diesel |
| Bore × Stroke | 121 mm × 152 mm (4.75 in × 6.00 in) |
| Fuel Injection System | Mechanical In-line Injection Pump (Direct Injection, Gear-Driven) |
| Aspiration | Turbocharged & Jacket Water Aftercooled (TA) |
| Dry Engine Weight | Approx. 1,180 kg (2,600 lbs) Complete Assembly |
| Standard Machine Match | Caterpillar 330B / 330B L Heavy Crawler Excavator |
Remanufacturing Standard: What Makes This Drop-In Ready?
This 3306TA engine is NOT an uninspected salvage pull. In 30-ton heavy excavators, reliability under sustained quarry duty is vital. It is completely rebuilt with 100% brand-new critical wear components:
- Structural Core Inspection: Heavy cast block, cylinder head, and massive forged crankshaft undergo ultrasonic carbon removal, chemical de-rusting, and magnetic particle crack testing. Deck mating surfaces are precision ground.
- 100% Brand-New Wear Components Installed: Brand-new heavy-duty pistons, multi-piece piston ring packs, wet cylinder liner sleeves with new O-ring crevice seals, connecting rod bearings, main crankshaft bearings, and thrust plates.
- Forged Crankshaft Re-Machining: Main and rod journals precision micropolished and dynamically balanced to factory runout tolerances.
- 100% Brand-New Gasket & Seal Kit: Complete front/rear crankshaft oil seals, multi-layer steel head gasket, oil pan gasket, and aftercooler O-rings replaced to eliminate jobsite leaks.
- Mechanical Injection Pump & Turbo Overhaul: In-line fuel pump re-plungered and flow-tested on a test bench for synchronized injection timing across all 6 cylinders.
When to Replace the Cat 3306TA Engine: Field Diagnostic Criteria
CAT 330B excavators frequently operate in extreme duty cycles such as deep pit extraction, heavy ripping, or hydraulic hammer work. When catastrophic wear occurs, a complete engine replacement is the fastest path back to production:
- Mechanical Injection Pump Plunger Scoring & Severe Power Loss: Worn pump plungers losing delivery volume under operating heat, causing the excavator to severely lose RPM or stall when engaging dual-pump hydraulic relief.
- Wet Liner Cavitation & Coolant-Oil Emulsion: Cylinder liner pitting from coolant vibration breakdown, allowing pressurized coolant to leak past bottom liner O-rings directly into the oil pan (milky engine oil).
- Main Bearing Spun / Crankshaft Journal Scoring: High engine operating hours leading to low oil pressure, spinning rod bearings and gouging the crankshaft beyond maximum serviceable limits.
- Cylinder Head Thermal Cracking: Excessive exhaust gas temperatures cracking cylinder heads between injector pre-combustion chambers and exhaust valves, causing combustion pressure into the radiator.
Workshop Testing Standards (Pre-Delivery Inspection)
Every remanufactured Cat 3306TA engine undergoes a strict 5-stage pre-dispatch inspection:
- Manual Crankshaft 720° Barring Test: Smooth rotation verification without valvetrain binding or mechanical interference.
- Mechanical Fuel Pump Timing & Plunger Check: Verification of fuel spill timing and injection nozzle atomization pattern.
- Lube Oil Gallery Pressure Priming: Pre-filling the oil circuit to confirm pressurized flow through main journals and turbocharger feed lines.
- Block & Head Pneumatic Leak Hold Test: Air hold test to guarantee oil cooler bundle and cylinder head gasket sealing integrity.
- Flywheel Coupler Concentricity Dial Check: Ensuring 100% true alignment for the hydraulic main pump drive coupling.
📹 Live 3306TA Engine Workshop Inspection Video
Watch our workshop technician verify rotation, stamped serial numbers, and mounting ports:
✓ Real physical unit filmed at Tatan Machinery workshop
Export Heavy-Duty Packaging Process
A 1.2-ton commercial engine requires reinforced industrial crating to withstand transoceanic shipping stresses:
- Internal & External Anti-Rust Preservation: All raw machined surfaces, crankshaft snout, and flywheel teeth coated with high-grade anti-corrosion grease.
- Dust Caps on All Openings: Intake manifold, exhaust elbow, water inlets, and fuel feed fittings sealed with heavy-duty protective plugs.
- Direct Sump-Skid Bolting: The engine is anchored securely to heavy timber base skids through rigid mounting brackets.
- ISPM 15 Fumigation-Free Solid Crate: High-density export plywood crate secured with galvanized steel strapping.
Actual export wooden crate packaging and internal skid bracing for Cat 3306TA
Global Shipping & Customs Documentation
Fast, reliable dispatch tailored for commercial contractors and parts wholesalers worldwide:
- Emergency Machine Down (AOG Freight): Priority air cargo via DHL Aviation, FedEx Heavy Cargo, or direct airline belly freight within 3–7 business days.
- Ocean Container Freight (LCL / FCL): Consolidated container shipping to all major commercial seaports worldwide.
- Complete Export Documents: Commercial Invoices with correct HS Code (8408.20), Packing Lists, and Certificates of Origin for smooth customs clearance.
Container loading and air freight dispatch supported by global logistics partners
Critical Installation Guidelines (330B Technician Checklist)
To prevent instant failure of the newly installed 3306TA engine assembly, field technicians MUST adhere to the following steps:
- MANDATORY: Radiator & Oil Cooler Chemical Flush: If the previous engine suffered journal bearing spun-out or melted pistons, copper and steel filings saturate the hydraulic oil cooler and external engine radiator. You MUST chemically clean and reverse-flush all coolers before installing the new engine!
- Manual Oil Priming (Pre-Lube): Pre-fill both large engine oil filters with clean 15W-40 oil. Disconnect the manual fuel shutoff rod/solenoid and crank the starter motor in 15-second cycles until oil pressure indicates on the cab monitor. NEVER start this large-displacement engine dry!
- Mechanical Injection Pump Air Bleeding: Use the fuel priming hand pump on the secondary filter base to purge all air from the governor housing and injection pump gallery. Trapped air causes severe plunger dry-friction.
- Flywheel Coupler & Hydraulic Pump Alignment: Verify the flexible rubber drive coupling connecting to the SBS120 / AP-14 hydraulic main pump. Any coupling distortion causes heavy torsional vibration and rear crankshaft oil seal blowouts.
- Throttle Linkage Adjustment: Calibrate the throttle actuator rod on the mechanical governor lever to confirm it reaches both low-idle and high-idle stops without mechanical binding.
Buyer Frequently Asked Questions (Purchasing FAQ)
Q: Is this 3306TA engine brand new or remanufactured? What is the actual build quality?
A: This engine assembly is professionally remanufactured strictly to Caterpillar OEM tolerances. We do not sell worn salvage yard engines. The cast iron block, cylinder head, and forged crankshaft undergo ultrasonic cleaning, crack detection, and precision machining. 100% of internal wear parts are replaced with brand-new components (new pistons, rings, liners, bearings, valves, and a complete gasket seal kit). It provides the exact performance and lifespan of an OEM build at a fraction of dealer pricing.
Q: Are all other products on your website remanufactured as well?
A: No. Only our heavy diesel engine assemblies are professionally remanufactured. All other excavator spare parts supplied by Tatan Machinery—including our hydraulic main pumps, main control valves, final drive travel motors, swing motors, and undercarriage components—are 100% Brand New (OEM-Grade Aftermarket) ready for immediate jobsite duty.
Q: CAT 330B excavators feature several serial prefixes (3YS, 4RS, 5LS, 8SR, 6DR). How do you ensure it fits my machine?
A: Different 330B production arrangements can feature different oil pan depths, aftercooler water piping orientations, or throttle motor brackets. We eliminate all guesswork: send your 330B serial number (PIN) from the cab tag and clear photos of your old engine’s fuel pump side and flywheel face to Gavin. We cross-verify the engineering arrangement in the official Caterpillar SIS database within 10 minutes.
Q: Can I see live photos and stamped block numbers of the actual engine before paying?
A: Absolutely yes. Prior to balance payment and dispatch, we send clear photos and live video of the specific unit assigned to your order. You will see the stamped serial numbers, mechanical injection pump tags, flywheel teeth, and the complete wooden box packaging process.
Q: What happens if the crate is damaged during sea freight, and what customs paperwork do you provide?
A: Every shipment from Tatan Machinery is protected by full commercial marine cargo insurance. The engine is bolted down directly onto internal skids within a fumigation-free solid plywood crate. We supply commercial invoices with accurate HS Codes (8408.20), detailed packing lists, and Certificates of Origin for smooth customs clearance at your destination port.
🔗 Frequently Purchased Together with CAT 330B Diesel Engine:
- MAIN VALVE:
Main Control Valve Assembly for Caterpillar 330B
100% Brand New - HYDRAULIC PUMP:
SBS120 / AP-14 Main Hydraulic Pump Assembly for Caterpillar 330B
100% Brand New - SWING MOTOR:
M5X180 Swing Motor Assembly for Caterpillar 330B
100% Brand New - BRAND CATALOG:
View All Caterpillar Excavator & Heavy Equipment Parts Collection
Get Wholesale Factory Quote for 3306TA 125-2965 Engine Assembly
Looking for direct factory pricing, stock availability, or technical verification for Cat 3306TA engines? Contact senior specialist Gavin now!
💡 Fast Quote: Send your engine serial number or nameplate photos for an accurate match within 10 minutes!
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote based on freight destination and configuration.
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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