Description
Tatan Machinery supplies complete replacement Caterpillar C9.3 diesel engine assemblies (OEM part numbers: 20R-7002, interchangeable with 3793736 / 3856677) specifically configured for CAT 336E and 336E L hydraulic excavators. This page provides actual first-party supplier specifications, pre-delivery workshop inspection evidence, diagnostic replacement criteria, and critical installation guidelines for field technicians and fleet owners.
Supplier Information & Facility Verification
| Supplier: | Tatan Machinery (Professional Excavator Parts Supplier) |
| Product Category: | Diesel Engine Assembly / Excavator Engine Parts |
| Engine Model: | Cat® C9.3 ACERT™ Industrial Diesel Engine |
| OEM Reference: | 20R-7002 (Cross Ref: 3793736, 3856677) |
| Target Machine: | CAT 336E / CAT 336E L Heavy Excavators |
🏢 Tatan Machinery Warehouse & Supply Facility
Physical inventory storage, component staging, and pre-export testing facility:
Direct inventory verification — no middle brokers. Physical inspections welcome.
Technical Specifications
| Parameter | Specification Data |
|---|---|
| Displacement | 9.3 Liters (567.5 cu in) |
| Cylinder Arrangement | Inline 6-Cylinder, 4-Stroke Diesel |
| Bore × Stroke | 115 mm × 149 mm (4.53 in × 5.87 in) |
| Fuel Injection System | High-Pressure Common Rail (HPCR) with Electronic Injectors |
| Aspiration | Turbocharged & Air-to-Air Aftercooled (ATAAC) |
| Standard Machine Match | Caterpillar 336E / 336E L Hydraulic Excavators |
When to Replace the C9.3 Engine Assembly: Field Diagnosis
For CAT 336E excavators operating under heavy duty (e.g., hard rock quarrying, hydraulic hammering), rebuilding on site is often cost-prohibitive. Tatan Machinery technical specialists recommend replacing the complete engine assembly under the following severe conditions:
- Crankshaft Seizure / Spun Main Bearings: Severe oil starvation or contaminated lube causing high heat, spinning rod/main bearings and scoring the crankshaft journals beyond standard undersize limits.
- Catastrophic Block or Head Cracking: Prolonged overheating from clogged cooling packs or blown head gaskets, resulting in internal coolant-to-oil cross contamination (milky oil emulsion).
- Severe Cylinder Liner Scoring / Piston Meltdown: Injector nozzle tip failure causing continuous over-fueling, burning through piston crowns and deeply scoring cylinder bore walls.
- Excessive Crankcase Blow-by & Power Loss: Worn piston rings and valve guides causing the excavator to stall under heavy hydraulic relief loads, resulting in unacceptable jobsite downtime.
Practical Fleet Advice: Replacing the entire engine assembly saves 50+ hours of field overhaul labor, avoids local machining tolerance errors, and gets your machine back to production within days.
Workshop Testing Standards (Pre-Delivery Inspection)
Before crating and releasing any C9.3 engine for export, Tatan Machinery’s mechanical engineers perform a mandatory 6-point verification protocol:
- Manual Crankshaft Barring Check: Manual 720° rotation to verify smooth piston stroke, absence of valve-to-crown interference, and correct gear-train backlash.
- Cold Oil Pressure Build Verification: Priming the lubrication gallery to verify oil passage continuity through the main bearings, rocker arms, and turbocharger oil feed line.
- High-Pressure Fuel Rail & Injector Seat Leak Test: Pressure decay testing of the fuel manifold and injection pump fittings to prevent crankcase fuel dilution.
- Cooling Jacket Pneumatic Pressure Test: 1.5 bar air hold test on the cylinder block water jackets to ensure absolute sealing of core plugs and oil cooler gaskets.
- Electrical Sensor & Wiring Harness Continuity: Checking crank angle sensors, cam position sensors, common rail pressure sensors, and glow plugs against OEM electrical resistance specs.
- Flywheel & Housing Concentricity Measurement: Dial indicator check on the flywheel face and pilot bore to prevent premature hydraulic pump coupler failure.
📹 Live Engine Pre-Shipment Inspection Video
Watch our engineer perform actual rotation, serial stamp check, and fitting verification:
✓ Real physical unit filmed at Tatan Machinery workshop
Export Heavy-Duty Packaging Process
Heavy machinery engines endure intense vibrations, moisture, and rough handling during international transit. Our dedicated packaging SOP prevents any transit damage:
- Fluid Draining & Internal Oil Film: All testing fluids are completely drained. Cylinder walls and valvetrain surfaces are coated with a protective internal anti-corrosion film.
- Port & Sensor Sealing: Turbocharger air inlet/outlet, exhaust manifold, water inlets, and fuel feed lines are sealed with heavy-duty rubberized dust plugs to eliminate foreign particulate entry.
- Steel-Reinforced Skid Mounting: The engine oil pan is suspended above the deck. The engine is bolted down securely through the front engine mounts and flywheel housing onto custom timber/steel skids.
- ISPM 15 Fumigation-Free Solid Plywood Box: Fully enclosed, high-density export crate secured with cross-bracing and double-banded galvanized steel straps.
Actual export wooden crate reinforcement for C9.3 engine shipment
Global Shipping & Customs Documentation
Whether your excavator is grounded at a remote mining site or you are stocking parts for your dealership, Tatan Machinery manages flexible logistics:
- Emergency Machine Down (AOG / Hot Freight): Priority air cargo via DHL Aviation, FedEx Freight, or airline belly freight to nearest international airport within 3–7 business days.
- Ocean Container Freight (LCL / FCL): Direct consolidated container sea shipping to major seaports in North America, Europe, Australia, South America, and Africa.
- Complete Customs Paperwork: We issue verified Commercial Invoices with correct HS Codes (8408.20 / 8409.99), detailed Packing Lists with gross/net weights, and Certificates of Origin for tariff relief.
Daily container loading and air dispatch supported by global logistics carriers
Critical Installation Guidelines (Technician Checklist)
To prevent accidental new-engine damage and maintain warranty validity, your mechanic MUST adhere to these field installation rules:
- MANDATORY: Flush Intercooler & Air Intake Piping: If the previous engine experienced turbocharger failure or piston meltdown, microscopic aluminum shards reside inside the charge-air cooler. If not chemically flushed, they will be sucked into the new cylinders within 30 seconds of first crank, causing instant catastrophic scoring!
- Engine Pre-Lubrication (Pre-Lube): Before first startup, fill the new engine oil filter with clean Cat 15W-40 oil. Disconnect the injector harness/fuel shutoff and crank the starter in 10-second intervals until the instrument cluster shows steady oil pressure gauge needle movement. NEVER dry-start!
- Air-Bleeding the Common Rail Fuel System: The high-pressure pump depends on diesel fuel for internal lubrication. Bleed all low-pressure air at the primary filter head hand pump before cranking. Dry cranking an HPCR pump will scorch internal plungers.
- Hydraulic Coupler & Dampener Alignment: Check the rubber dampening element between the engine flywheel and the SBS140 main hydraulic pump. Replace if heat-hardened. Misalignment causes heavy axial vibration and rear crankshaft oil seal blowouts.
- Coolant Evacuation & Refill: Use clean 50/50 Extended Life Coolant (Cat ELC). Bleed trapped air from the cylinder head vent line to prevent localized hot-spot head warping.
Buyer Frequently Asked Questions (Purchasing FAQ)
Q: What components are included with this C9.3 engine assembly? Is it a complete drop-in unit?
A: Our assembly is configured as a complete running engine. It includes the cylinder block, cylinder head, valvetrain, crankshaft, pistons, common rail fuel injection pump, fuel injectors, turbocharger, water pump, oil cooler, oil pan, and engine wire harness. Electronic control modules (ECM/ECU), starters, and alternators can be included based on your serial number specification.
Q: My CAT 336E was manufactured in Japan / US with different emission tier. How do you guarantee it fits?
A: Caterpillar C9.3 engines have multiple prefix codes (such as C9N, WDA, DKN). We do not ship by guesswork. Send your machine’s 17-digit PIN and the metal tag on your existing engine block to Gavin. We cross-verify fuel rail angle, flywheel housing SAE pattern, and sensor pinouts in the official Caterpillar SIS system to ensure 100% bolt-on compatibility.
Q: Can I see the exact photos and stamped serial numbers of the actual engine I will receive before paying?
A: Absolutely yes. Transparency is our core standard. Before dispatch, we send high-resolution photos and video showing the stamped engine block serial number, casting numbers, flywheel teeth, and the wooden box crating sequence. The serial number on your Commercial Invoice matches the engine you unpack.
Q: What happens if the engine crate is dropped or damaged during ocean or air transit?
A: Every shipment from Tatan Machinery includes full commercial cargo insurance (All Risks / Institute Cargo Clauses A). Our heavy internal steel bolting ensures the engine cannot move within the box. In the rare event of transit damage, inspection reports from the carrier trigger prompt replacement or insurance claim processing.
🔗 Frequently Purchased Together with CAT 336E Diesel Engine:
Get Wholesale Factory Quote for C9.3 20R-7002 Engine Assembly
Looking for direct factory pricing, stock availability, or technical verification for Cat C9.3 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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