ISUZU 4JB1 Oil Pump Assembly - OE Quality Direct Replacement with Hardened Steel Gears and Chain-Driven Reliability
The engine oil pump pressurizes and circulates lubricating oil to critical moving parts (crankshaft, camshaft, bearings, piston cooling jets). It maintains stable oil pressure across all engine speeds, preventing metal-to-metal contact and ensuring long-term engine reliability.
The Engine Oil Pump Assembly (OEM Numbers: 8-97033175-0, 8-97385984-0 / 8970331750, 8973859840) is a premium-quality, direct replacement lubrication component engineered specifically for the legendary ISUZU 4JB1 2.8L diesel engine, the workhorse found in ISUZU NKR55, NKR58, NHR, NPR, 100P, ELF series light trucks, as well as TFR/TF pickups, D‑MAX (early), JMC (Jiangling) JX493, Hitachi EX/ZAXIS, Kobelco SK, Kato HD series and industrial applications.
| Part Number: | 8-97033175-0 8973859840 | Product Name: | Oil Pump |
| Car Model: | ISUZU NKR55 | Engine Model: | ISUZU 4JB1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | Package: | Neutral Packing Or Make It As Requested |
| Material: | High-strength aluminum alloy & precision bearings | Cooling Type: | Engine coolant circulation |
| Installation: | Direct OEM replacement | Quality Standard: | OEM equivalent / ISO quality control |
- OE Quality: Manufactured to strict ISUZU OEM dimensional and material standards for perfect direct-fit replacement
- Gear-Type Pump Design: Precision-machined gear-type design delivers consistent flow with minimal pulsation
- Integrated Pressure Relief Valve: Factory-calibrated spring-loaded pressure relief valve prevents over-pressurization
- Chain-Driven Reliability: Driven directly from crankshaft via timing chain for immediate oil pressure and zero maintenance
- Hardened Steel Gears: Case-hardened steel gears resist wear, pitting, and spalling for extended service life
- Restores Factory Oil Pressure: Replaces worn components to restore consistent oil pressure at idle and under load
- Prevents Catastrophic Engine Failure: Protects against bearing failure and turbocharger damage
- Direct Replacement: Simple bolt-on installation with no modifications required
- Cross-Platform Compatibility: Fits wide range of Isuzu N-series trucks, TFR pickups, and industrial equipment
- ISO 9001:2015 / IATF 16949 Certified: Manufactured under strict automotive quality management standards
- Long Service Life: Designed for 500,000+ km of heavy-duty commercial operation
- Material Verification: Housing composition and gear steel tested to JIS/SAE durability standards
- Dimensional Accuracy: Verified against OE blueprints using CMM equipment (±0.01 mm tolerance)
- Gear Clearance Inspection: Radial clearance, axial clearance, and backlash measured for optimal performance
- Pressure Relief Valve Calibration: 100% tested on flow bench for correct pressure and flow rates
- Hardness Testing: Gear teeth verified using Rockwell hardness testers
- Durability Testing: Accelerated life-cycle testing validates long-term reliability
- Leak Testing: 100% pressure-tested to guarantee no internal or external leakage
- Vibration & Thermal Cycling Test: Validates reliability in various operating environments
- Visual Inspection: 100% inspected for manufacturing imperfections
- Safe Packaging: Anti-corrosion coated and sealed in moisture-barrier VCI bags
| Symptom | Likely Cause | Action |
|---|---|---|
| Low oil pressure warning light flickers at idle | Worn pump gears or pressure relief valve stuck open | Check pressure with mechanical gauge; replace pump if pressure is below spec |
| Engine knocking (bottom-end noise) under load | Oil starvation to main/rod bearings due to low pump output | Immediate pump replacement; inspect bearings for damage |
| Fluctuating oil pressure on dash gauge / scanner | Internal gear wear or erratic relief valve operation | Replace oil pump and verify oil pressure with manual gauge |
| Metal particles in oil filter / sump | Pump gear tooth wear or scoring on housing bore | Replace pump, flush oil system, and replace oil cooler |
| No oil pressure at idle (0 psi on gauge) | Pump drive failure or seized pump | Do not start engine — inspect drive components, replace pump |
| Valvetrain noise (ticking, clatter) | Insufficient oil delivery to camshaft and lifters | Verify oil pressure; replace pump if low |
- Individual Packaging: Anti-corrosion coated, sealed in VCI bags with OE-style labeling
- Wholesale / Bulk Orders: Available in case packs of 5, 10, 20, 50 units with pallet pricing
- Customization: Private-label retail packaging available for volume orders
- Fast Shipping: Ready stock for immediate dispatch worldwide
- Wholesale Support: Long-term supply agreements and tiered commercial pricing
For pricing, availability, or bulk purchase of the ISUZU Oil Pump Assembly 8-97033175-0 (8970331750 / 8973859840) for 4JB1, 4JA1, 4JH1, 4JG2 engines, and compatible NKR55, NHR, NPR, TFR, D‑MAX, Hitachi EX, Kobelco SK, JMC JX493 applications, including 4JB1‑T (turbo) and 4JB1‑NA (naturally aspirated) variants, please contact our sales team for a competitive wholesale quote and expert technical support. We respond to all inquiries within 24 hours.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.