Product Details

Product Overview

This professional-grade diesel engine oil pump, identified by OEM part numbers 8973859840 and 8-97385984-0, is a direct replacement for Isuzu NHR, NKR, and NKR55 series vehicles equipped with the 4JB1 and 4JB1-T diesel engines. Manufactured to meet or exceed original equipment specifications, this oil pump ensures reliable lubrication, reduced engine wear, and consistent oil pressure. We serve a global B2B clientele, with major distribution hubs in North America, Europe, the Middle East, and Asia-Pacific, providing fast shipping to industrial centers and major ports worldwide.

Key Features & Benefits

• Precision Engineering: CNC-machined components ensure exact fitment and optimal oil flow for the Isuzu 4JB1 engine series.
• High Durability: Constructed from hardened steel and high-grade aluminum alloys to resist wear and thermal stress.
• Consistent Oil Pressure: Designed to maintain stable lubrication under heavy loads and high-RPM conditions.
• Direct OEM Replacement: Drop-in fit for Isuzu NHR, NKR, and NKR55 applications without modifications.
• Cost-Effective Solution: Offers significant savings over dealer OEM parts while maintaining factory-level performance.

Technical Specifications

OEM Cross-Reference

This oil pump directly replaces the following OEM and aftermarket part numbers:

• Isuzu OEM: 8973859840, 8-97385984-0, 97385984
• Cross-Reference: 8973859841 (superseded), 8-97385984-1

Note: Always verify compatibility with your specific engine serial number before installation.

Compatibility

• Engine Models: Isuzu 4JB1 (naturally aspirated), 4JB1-T (turbocharged)
• Vehicle Models: Isuzu NHR (light-duty truck), NKR (medium-duty truck), NKR55 (4×4 variant)
• Year Range: 1990s – 2000s (specific to 4JB1 engine production)

Global Supply & Distribution

We are a dedicated supplier of Isuzu engine components, offering worldwide logistics solutions. Our supply chain supports:

• North America: Fast delivery to Los Angeles, Houston, Chicago, and Toronto ports.
• Europe: Regular shipments to Rotterdam, Hamburg, and Antwerp for distribution across the EU.
• Asia-Pacific: Direct shipping to Singapore, Dubai, and major Australian industrial centers.
• Middle East & Africa: Reliable service to Jebel Ali, Dammam, and Johannesburg.
• Export Compliance: All shipments comply with international trade regulations, with full documentation (Commercial Invoice, Packing List, COO).

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001:2015 certified facilities.
• Testing: 100% pressure and flow-tested before shipment to ensure zero defects.
• Warranty: 12-month warranty against manufacturing defects, with dedicated after-sales support.

FAQ

Q1: Will this oil pump fit my Isuzu NKR55 with the 4JB1-T engine?

Yes, this pump is designed as a direct replacement for the 4JB1 and 4JB1-T engines found in the Isuzu NKR55, NHR, and NKR models. Ensure your engine block uses the same mounting pattern by comparing the gasket surface. If your engine is a 4JB1-T, this pump handles the additional oil flow demands of the turbocharger.

Q2: What is the recommended installation procedure for this oil pump?

We recommend the following steps: (1) Drain engine oil and remove the oil pan. (2) Remove the old pump and clean the mounting surface. (3) Prime the new pump by filling it with clean engine oil. (4) Install the pump with a new gasket, tightening bolts to OEM torque specifications (typically 18-22 Nm). (5) Reinstall the oil pan, fill with fresh oil, and run the engine to check for leaks and proper pressure.

Q3: How often should this oil pump be replaced during engine maintenance?

This oil pump is a wear item and should be inspected during major engine overhauls or when replacing the timing belt/chain. For the Isuzu 4JB1, we recommend replacement every 150,000-200,000 km or if oil pressure drops below 10 PSI at idle. Regular oil changes (every 5,000 km) will extend pump life by preventing sludge buildup.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .