Description
Mitsubishi S3L Diesel Engine Assembly Overview
The Mitsubishi S3L Diesel Engine Assembly (OEM Part Numbers: S3L, S3L2, 31B94-01030, 31B94-01010) manufactured by Tatan is a 1.318L 3-cylinder naturally aspirated water-cooled engine belonging to our Diesel Engine Assembly classification. Engineered specifically for Caterpillar CAT 303, CAT 303.5, Hitachi ZX30, and Komatsu PC30 3-ton compact mini excavators, replacing your worn engine with a Tatan complete S3L assembly eliminates machine downtime, excessive blow-by, and severe hydraulic power loss instantly.
Built strictly according to original OEM specifications, this complete engine assembly comes pre-assembled with mechanical fuel injection pump, fuel injectors, starter motor, and alternator, ensuring 100% direct bolt-on fitment with hydraulic pump couplings and mounting brackets.
Key Attributes & Parameters for Mitsubishi S3L Diesel Engine Assembly
| Product Category | Diesel Engine Assembly | Warranty | 1 Year / 12 Months |
| Specific Engine Model | Mitsubishi S3L / S3L2 Engine | Brand Name | Tatan |
| Compatible Equipment | Caterpillar CAT 303 | Hitachi ZX30 | OEM Part Number | S3L2 / 31B94-01030 |
| Engine Displacement | 1.318 Liters (1318 cc / 1.3L) | Cylinder Arrangement | 3 Cylinders Inline (I-3) 4-Stroke |
| Horsepower & RPM | 13.4-21 kW (18-28 HP) @ 2200-2500 | Cooling System | Water-Cooled / Liquid Cooled |
| Fuel Injection System | Direct / Swirl Chamber Mechanical Pump | Aspiration Type | Naturally Aspirated (NA) |
| Machinery Test Report | Provided (100% Dyno Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Quality Status | 100% Brand New Engine | Packaging | Export Wooden Box Packaging |
Supported Machinery Brands & Engine Parts Coverage
In addition to Mitsubishi, Tatan manufactures replacement complete diesel engines and overhaul components for leading machinery brands:
Application Scenarios & Buyer Value
When upgrading or replacing your compact mini excavator engine with our Mitsubishi S3L Diesel Engine Assembly, buyers achieve maximum operational uptime and power efficiency:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Caterpillar CAT 303 / Hitachi ZX30 Engine Swap | Complete engine swap cuts machine repair downtime by up to 70% compared to internal rebuilding. |
| Excavator Overhaul Workshops | Eliminates tedious line-boring, sleeve honing, and crank fitting; saves mechanic labor hours. |
| Engine Distributors & Stockists | High-demand 1.3L mini excavator engine ready for immediate resale to plant hire fleets and repair networks. |
| Rental Fleet Maintenance | Extends 3-ton mini excavator working lifespan and restores full digging hydraulic torque under load. |
Mitsubishi S3L Diesel Engine Assembly OEM Diagnostic Guide
Use this OEM manual diagnostic guide to troubleshoot operational engine symptoms on your 3-ton mini excavator:
| Engine Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Hard cold starting & dense white smoke | Mechanical injection pump timing retarded or low compression (<2.8 MPa) in 3 cylinders due to piston ring wear. | Adjust mechanical injection pump timing or replace with Tatan complete S3L engine assembly. |
| 2. Severe power loss under heavy digging load | Mechanical fuel injection pump governor spring fatigue or clogged fuel filter. | Inspect fuel delivery system or swap to a Tatan factory pre-tested S3L2 engine assembly. |
| 3. High engine oil consumption & heavy crankcase blow-by | Scored 1.3L cylinder liners, stuck oil rings, or valve stem seal wear allowing engine oil into combustion chambers. | Install Tatan new S3L complete engine; flush engine oil gallery and replace oil filter. |
| 4. Engine overheating & coolant surge into expansion tank | Water pump impeller erosion, clogged radiator core, or cylinder head gasket leaking combustion gas into cooling jacket. | Replace thermostat (82°C), flush cooling system, or swap to a new Mitsubishi S3L complete engine assembly. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan Mitsubishi S3L engine assembly undergoes anti-rust oiling, waterproof plastic sealing, and solid export wooden box packaging.
✈️ Express Air Courier
Partnered with DHL, FedEx, UPS, and TNT for express door-to-door delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL ocean container shipping for heavy engine assemblies and bulk orders.
📦 Export Wooden Cases
Fumigated solid wooden boxes with thick shockproof foam lining for maximum safety.
Quality Control & International Certificates
Tatan diesel engines are manufactured under ISO 9001 quality management systems and strictly comply with CE safety standards.
Mitsubishi S3L Engine FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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