Oil Pump Assembly with Trochoid (Gerotor) Design for ISUZU 4JJ1 4JK1 Engines - Crankshaft-Driven & 24-Month Warranty
| Operating Pressure: | Hot Idle ≥1.0bar (15psi), High-speed 3.0–4.5bar (44–65psi) | Pump Type: | Trochoid (Gerotor) |
| Drive Type: | Crankshaft-driven (gear/chain) | Engine Compatibility: | ISUZU 4JJ1 3.0L / 4JJ1-T / 4JJ1-TCS / 4JJ1-TCX / 4JK1 2.5L / 4JK1-TCX |
| Material: | Metal | Cooling Type: | Engine Coolant Circulation |
| High Light: | Trochoid Oil Pump Assembly,24-Month Warranty Engine Oil Pump,Crankshaft-Driven Lubrication Pump |
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Engine Oil Pump Assembly with OEM numbers 8981281340 / 8-98128134-0 and 8981451531 / 8-98145153-1 (associated numbers 8982326241 / 8973815533 / 8981451530 / 8980537770) is a verified direct-fit replacement for ISUZU 4JJ1 3.0L and 4JK1 2.5L diesel engines. This oil pump serves as the power source of the engine's lubrication system, widely used in ISUZU D-MAX, NLR85, NMR85 trucks and HITACHI ZX120-3 / ZX130, JCB, 135D/135G heavy equipment.
The oil pump is driven by the engine crankshaft via gears or chain, featuring a Trochoid (Gerotor) design. The pump draws oil from the oil pan through the strainer (pickup tube), pressurizes it, and delivers it through the oil filter to all engine lubrication points including crankshaft main journals, connecting rod journals, camshaft journals, and turbocharger bearings, forming a complete pressure lubrication circuit. Additionally, the oil cools pistons, reduces friction, cleans contaminants, and prevents rust. This oil pump assembly ensures the engine receives stable, adequate oil pressure and flow under all operating conditions.
- Oil Pressure Warning Light - Dashboard oil pressure light stays on or flashes
- Engine Knocking Noise - Metallic knocking or tapping sounds during operation
- Low Oil Pressure - Oil pressure gauge reading below normal
- Engine Overheating - Insufficient oil circulation fails to cool engine components
- Start-up Noise - Brief metallic grinding noise during cold start
- Clogged Strainer - Debris in oil pan blocking strainer
| Part Number: | 8981281340 8-98128134-0 | Product Name: | Oil Pump Assembly |
| Car Model: | D-MAX NLR85 | Engine Model: | 4JJ1 4JK1 |
| Condition: | 100% Brand New | Material: | High-strength aluminum alloy & precision bearings |
| Brand | Model | Engine | Notes |
|---|---|---|---|
| ISUZU | D-MAX | 4JJ1-T / 4JJ1-TCS / 4JJ1-TCX / 4JK1-TCX | Primary fitment |
| ISUZU | NLR85 | 4JJ1 / 4JJ1T | Primary fitment |
| ISUZU | NMR85 | 4JJ1 | Primary fitment |
| ISUZU | NHR85 | 4JJ1 |
| Brand | Model | Engine | Notes |
|---|---|---|---|
| HITACHI | ZX120-3 / ZX120 | 4JJ1 | Primary fitment |
| HITACHI | ZX130 / ZX130-5N | 4JJ1 | Primary fitment |
| HITACHI | ZX180LC-5N | 4JJ1 | |
| HITACHI | ZAXIS120-3 | 4JJ1 | |
| JCB | -- | 4JJ1 | |
| 135D / 135G | 4JJ1 |
| Feature | Benefit + Verification Signal |
|---|---|
| Trochoid (Gerotor) Design | Compact, efficient, smooth operation, ensuring stable oil pressure for 4JJ1/4JK1 engines under all conditions |
| IZUMI ORIGINAL Brand Quality | Internationally recognized brand specifically for ISUZU engines with 24-month extended warranty |
| Precision-Machined Rotor & Housing | Ensures precise internal clearances for stable oil pressure and prevents pressure fluctuations |
| Crankshaft Direct Drive | Reliable power transmission with no belt slip risk, ensuring pump synchronizes with engine operation |
| Broad Compatibility | Fits multiple ISUZU truck models and heavy equipment applications |
| 100% Factory Flow/Pressure Tested | Every pump undergoes strict flow, pressure, and seal integrity testing |
| 24-Month Warranty | Peace of mind on manufacturing defects with free replacement within warranty period |
- The oil pump is a critical component of the engine lubrication system - failure leads to insufficient lubrication, potentially causing engine seizure or catastrophic failure
- The oil pump is a single-use component - once worn or damaged, it cannot be repaired and must be replaced
- Recommended to replace the oil strainer and oil filter simultaneously when replacing the oil pump
- Use new O-rings and gaskets during installation; torque mounting bolts to workshop manual specification
- Fill with ISUZU-specified engine oil to the proper level after installation
- Check oil pressure after start-up to ensure it is within normal range
- For 100% accurate fitment, please provide VIN (Chassis Number) or engine model
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