Description
4JG1 8971096421 Diesel Engine Assembly Overview
The 4JG1 8971096421 Engine assembly manufactured by Tatan is a 3.059-liter inline 4-cylinder water-cooled industrial diesel powerplant belonging to our Diesel Engine Assembly classification. Engineered specifically for Hitachi ZX70, ZX70-HHE, and ZX75US 7-ton excavators, replacing your worn or blown engine core with a Tatan complete turnkey assembly stops crankcase oil spitting, restores 40.5 kW (54.3 HP) rated output at 2100 RPM, and cures hot-idle oil pressure loss under continuous hydraulic pump load.
Coupled directly to the machine’s main hydraulic pump and governing the main control valve assembly, this complete diesel engine incorporates an induction-hardened forged steel crankshaft, a direct-injection crossflow cylinder head, an internal trochoid gear oil pump, and an in-line mechanical VE distributor fuel injection pump, ensuring 100% direct bolt-on installation with flywheel housings and chassis mounts.
Key Attributes & Technical Parameters for 4JG1 8971096421 Engine
| Product Category | Diesel Engine Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Isuzu 4JG1 / 4JG1-PA Diesel Engine | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX70 | ZX70-HHE | ZX75US (7-Ton) | OEM Part Number | 8971096421 / 8971909300 |
| Matched Engine Series | Isuzu 4JG1 Series (4-Cylinder) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 40.5 kW – 44.0 kW @ 2100 RPM Rated | Pilot Control Pressure | 3.059 Liters (95.4mm × 107mm) |
| Spool Precision Spec | Precision-Honed Dry Liners < 0.003 mm | Quality Status | 100% Brand New Turnkey Assembly |
| Machinery Test Report | Provided (100% Dyno Bench Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Hydraulic Fluid Spec | 15W-40 Heavy-Duty Diesel Engine Oil | Packaging | Export Wooden Box Packaging |
Multi-Machinery Fleet Support & Engine Assembly Inventory
Tatan supplies factory-built turnkey diesel engines, cooling packages, water pumps, and internal overhaul rebuild parts for excavators, wheel loaders, and compact rollers globally:
Supported Excavator Machinery Brands & Global Coverage
In addition to Hitachi compact excavators, Tatan manufactures and supplies replacement complete diesel engines, short blocks, and overhaul parts across major equipment brands:
Application Scenarios & Buyer Value
When replacing your 7-ton excavator power unit with our 4JG1 8971096421 Engine, workshop mechanics and fleet managers secure direct operational benefits:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX70 Engine Repowering | 1:1 direct bolt-on installation eliminates starting delays and restores full 40.5 kW power for heavy trenching and rock digging. |
| Compact Machinery Repair Workshops | Avoids the complex labor of block re-boring and injector pump calibration; installs as a pre-timed turnkey unit. |
| Urban Utility & Earthmoving Fleets | Heavy-duty forged pistons and multi-layer steel head gaskets withstand continuous hydraulic breaker hammer operations. |
| Equipment Parts Stockists | High-demand 3.0L 4-cylinder engine inventory packaged in solid export wooden crates ready for immediate global dispatch. |
4JG1 8971096421 Engine OEM Diagnostic & Troubleshooting Guide
Use this technical guide to troubleshoot Isuzu 4JG1 diesel engine symptoms on your Hitachi ZX70 compact excavator:
| Engine Fault Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Hard cold starting with heavy white smoke | Mechanical VE distributor injection pump advance piston sticking or worn plungers, dropping injection pressure below 18.5 MPa. | Replace with Tatan 8971096421 complete engine fitted with brand-new factory-calibrated VE distributor pump and pre-tested glow plugs. |
| 2. Coolant boiling & expansion tank bubbling | Combustion gas blown past cylinder head gasket on rear cylinders due to localized thermal distortion under heavy rock hammer work. | Install Tatan new engine with factory-torqued MLS head gasket and precision surface-milled block face. |
| 3. Heavy crankcase blow-by & oil spitting | 95.4mm cylinder dry liner wall micro-scoring or stuck top compression rings allowing combustion pressure into the oil pan. | Install Tatan new 4JG1 turnkey engine; flush radiator cooling fins and install fresh dual-element air filters. |
| 4. Oil pressure lamp flickers at hot idle (< 0.10 MPa) | Excessive crankshaft main journal bearing clearance or worn trochoid oil pump rotor losing delivery volume. | Replace complete engine assembly to maintain factory oil pressure (> 0.38 MPa rated / > 0.15 MPa idle) and prevent crankshaft seizure. |
Transport Packaging & Certified Quality Assurance
Every Tatan diesel engine undergoes internal anti-corrosion fogging, heat-sealed plastic wrap, and solid timber export crating:
✈️ Express Air Courier
Partnered with DHL, FedEx, and UPS for 3-7 day priority delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL container ocean freight for bulk equipment parts replenishment.
📦 Export Wooden Crates
Solid fumigated timber cases lined with thick shockproof foam to prevent transit damage.
4JG1 8971096421 Engine FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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