Internal Gear Oil Pump Assembly with High-Grade Cast Aluminum Housing and Integrated Pressure Relief Valve for ISUZU NKR77 4JH1 Engine

Precision-engineered oil pump assembly delivers consistent engine oil pressure to all moving components, ensuring proper lubrication, cooling, and protection for ISUZU 4JH1 diesel engines.

• OE Quality: Manufactured to strict ISUZU dimensional and performance specifications for perfect fit and function
• Precision Gearing: Internal pump components machined to exacting tolerances for consistent oil flow
• Integrated Pressure Relief Valve: Pre-set to maintain optimal system pressure and prevent over-pressurization
• Durable Housing: High-quality cast aluminum/alloy housing resists wear and corrosion
• Consistent Oil Pressure: Delivers reliable oil flow across the entire engine speed and temperature range
• Protects Critical Components: Ensures proper lubrication of bearings, camshaft, and valve train
• Extends Engine Life: Proper oil pressure prevents premature wear and catastrophic failure
• Direct Replacement: Simple installation during engine overhaul or oil pump service
• Cost-Effective Maintenance: Protects the engine investment by preventing oil-related failures

Compatible Vehicles:

• ISUZU NKR77 – Light-Duty Trucks
• ISUZU NPR (select models with 4JH1 engine)
• ISUZU NQR (select models)

ISUZU 4JH1 Engine Specifications:

• 4-Cylinder, Inline Diesel
• Displacement: 3.0L (2999cc)
• Turbocharged, Intercooled
• Valvetrain: DOHC (or OHV depending on variant)

Industrial Applications: Forklifts, generators, compressors, agricultural equipment, and various industrial applications utilizing the 4JH1 engine.

Professional engine builder installation required. Proper oil system preparation is critical:

1. Drain engine oil completely before beginning work
2. Safely remove the oil pan to access the oil pump
3. Disconnect the pickup tube and remove the pump mounting bolts
4. Remove the oil pump drive gear or coupling from the crankshaft/camshaft
5. Check the drive gear and crankshaft/camshaft drive for wear; replace as needed
6. Thoroughly clean the engine block mounting surface and surrounding areas
7. Check the oil pickup tube and screen for blockage or damage
8. Install the drive gear onto the new pump if not pre-installed
9. Verify the pump rotates freely and in the correct direction
10. Position the new pump and install mounting bolts
11. Tighten bolts to manufacturer specification
12. Install the oil pickup tube with a new O-ring/gasket
13. Install the oil pan with a new gasket
14. Fill the engine with the correct grade and amount of oil
15. Prime the oil system by cranking the engine (without starting) or using an oil priming tool
16. Start the engine and verify oil pressure is within specification
17. Inspect the oil pan and pump area for any oil leakage

• Material Verification: Confirms housing and internal component materials meet OE specifications
• Dimensional Inspection: All pump clearances, gear profiles, and mounting dimensions verified against OEM tolerances
• Gear Profile Inspection: Pump gear geometry checked for proper meshing and flow characteristics
• Pressure Relief Valve Calibration: Valve opening pressure verified to OE specification
• Flow Rate Testing: Oil flow capacity verified against OEM requirements
• Pressure Testing: Pump output pressure verified at various speeds
• Visual Inspection: 100% checked for casting defects, machining flaws, or damage
• Packaged Safely: Protected and securely boxed to prevent damage during transit

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea
• Main Markets: Middle East, Asia, Africa, South America, North America & Europe