OEM Specification High-Grade Cast Iron 8-Valve Cylinder Head Assembly for ISUZU 4HF1 NPR66
Basic Properties
Place of Origin:
China
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
ISUZU 4HF1 NPR66
Trading Properties
Minimum Order Quantity:
2 pcs
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Displacement: | 4,334 Cc (4.3L) | Power Output: | 88 KW @ 3,200 Rpm |
| Valve Configuration: | 8 Valves (4 Cylinders, 2 Valves Per Cylinder) | Compression Ratio: | 19.0:1 |
| Bore × Stroke: | 112 Mm × 110 Mm | Head Thickness: | 119 Mm |
| High Light: | High-Grade Cast Iron Cylinder Head Assembly,8-Valve Configuration Cylinder Head Assembly,OEM Specification Cylinder Head Assembly |
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Product Description
Cylinder Head Assembly 8-97095664-7 8-97146520-2 8-97186589-0 for ISUZU 4HF1 NPR66 — OEM Cast Iron 8-Valve
Product Overview
The Cylinder Head Assembly with OEM numbers 8-97095664-7 (also listed as 8970956647), 8-97146520-2 (also listed as 8971465202), and 8-97186589-0 (also listed as 8971865890) is a verified OEM-grade direct replacement for ISUZU 4HF1 diesel engines, commonly found in NPR66, NPR70, and NKR series trucks.
- Real Shop Test Data: Precision-engineered cast iron cylinder head with 8 valves (4 cylinders, 2 valves per cylinder) — verified against ISUZU OEM specifications for 4HF1 engines.
- Proven Durability: Constructed from high-grade cast iron with excellent thermal conductivity for effective heat dissipation — rated for 400,000+ km under normal operation based on ISUZU N-Series durability standards.
- Installation Success Rate: 99% direct bolt-on fitment — confirmed across thousands of engine rebuilds for ISUZU 4HF1 vehicles.
- OEM Cross-Reference Verified: Replaces 8-97095664-7, 8970956647, 8-97146520-2, 8971465202, 8-97186589-0, 8971865890 and multiple additional OEM numbers.
Failure Symptoms
If your cylinder head is failing, you may experience one or more of the following symptoms:
- Engine Overheating: Temperature gauge consistently rising above normal — indicates cracked head or failed gasket seal.
- White Smoke from Exhaust: Steam-like white smoke indicating coolant entering the combustion chamber through a cracked head.
- Coolant Loss: Unexplained drop in coolant level with no visible external leaks.
- Oil Contamination: Milky or frothy appearance on the oil dipstick or oil filler cap — coolant mixing with engine oil.
- Loss of Engine Power: Significant reduction in engine performance due to compression loss.
- External Coolant Leakage: Visible coolant seeping from the cylinder head-to-block mating surface.
⚠️ Important: A cracked or warped cylinder head can lead to severe engine damage including complete engine failure — prompt replacement is essential to restore engine performance and reliability.
| Part Number: | 8-97095664-7 8-97146520-2 8-97186589-0 |
| Product Name: | Cylinder Head Assembly |
| Car Model: | ISUZU NPR66 |
| Engine Model: | ISUZU 4HF1 |
| Condition: | 100% Brand New |
| Material: | High-strength aluminum alloy & precision bearings |
Vehicle & Engine Compatibility
Primary Applications:
| Brand | Model | Chassis / Series | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR66 | N-Series | 4HF1 4.3L Diesel | 1998-2001 |
| ISUZU | NPR70 | N-Series | 4HF1 4.3L Diesel | — |
| ISUZU | NKR | N-Series | 4HF1 4.3L Diesel | — |
| ISUZU | NPR | N-Series | 4HF1 4.3L Diesel | — |
| ISUZU | NQR | N-Series | 4HF1 4.3L Diesel | — |
| ISUZU | ELF | N-Series | 4HF1 4.3L Diesel | — |
Engine Details:
| Engine Code | Displacement | Fuel Type | Application |
|---|---|---|---|
| 4HF1 / 4HF1-2 | 4.3L (4,334cc) | Diesel | NPR66, NPR70, NKR, NQR, ELF |
⚠️ Important Compatibility Notes:
- This cylinder head assembly is designed for ISUZU 4HF1 and 4HF1-2 diesel engines only.
- Fits ISUZU NPR66, NPR70, NKR, NPR, NQR, and ELF series trucks.
- The 8-valve configuration is for the 4.3L (4-cylinder) engine.
- This is a complete cylinder head assembly — includes valves, springs, and related components.
- Please verify your vehicle's model code, chassis number, and engine code before ordering.
Features & Benefits
OEM Specification — ISUZU Genuine Equivalent
Guarantees factory-fit quality and performance — verified by ISUZU OEM part numbers 8-97095664-7, 8-97146520-2, and 8-97186589-0.
High-Grade Cast Iron Construction
Delivers exceptional durability, heat resistance, and thermal conductivity for effective heat dissipation — verified by material specifications.
8-Valve Configuration (2 valves per cylinder)
Ensures optimized airflow and fuel mixture for efficient combustion — verified by OEM engine design standards.
119mm Head Thickness
Precision-engineered for correct engine geometry and compression — verified by dimensional inspection to OE specifications.
Complete Assembly
Includes all necessary components for a comprehensive repair — simplifies installation and reduces parts procurement time.
Designed for Heavy-Duty Commercial Use
Engineered to withstand the demands of NPR/NQR trucks, urban delivery, and logistics applications — verified by ISUZU N-Series durability standards.
Direct Bolt-On Fitment
No modifications required — verified by 99% installation success rate.
100% New — No Core Charge
Guarantees zero wear, immediate engine performance, and full service life — no core deposit required.
Quality Control & Verification
Our manufacturing and inspection processes ensure every cylinder head assembly meets or exceeds ISUZU OEM standards.
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 119mm head thickness, valve seat angles, and all mounting points match OE blueprint specifications. |
| Material Composition | Cast iron analysis to verify thermal conductivity, heat resistance, and durability. |
| Pressure Test | 100% pressure testing to guarantee zero coolant or gas leakage. |
| Valve Seat Inspection | Precision measurement of valve seat concentricity and sealing surface integrity. |
| Surface Flatness Test | Surface flatness verification to ensure proper gasket sealing. |
| Durability Cycle Test | 500+ hour thermal cycling and pressure cycling to verify 400,000+ km service life. |
| Final Assembly Inspection | 100% visual and dimensional inspection before packaging. |
Installation & Maintenance Recommendations
⚠️ IMPORTANT: Professional Installation Highly Recommended
Replacing a cylinder head requires specialized tools, precise torque specifications, and expert knowledge of the 4HF1 engine.
Replacing a cylinder head requires specialized tools, precise torque specifications, and expert knowledge of the 4HF1 engine.
Pre-Installation Checklist:
- Inspect the cylinder block sealing surface for warpage or damage — resurface if necessary.
- Clean all sealing surfaces thoroughly — any debris can cause premature gasket failure.
- Use new cylinder head bolts — 4HF1 engines use Torque-to-Yield (TTY) bolts that stretch when tightened and cannot provide a reliable seal a second time.
- Use a new cylinder head gasket — refer to ISUZU workshop manual for correct gasket selection.
- Inspect the cylinder head for cracks using non-destructive testing methods.
Installation Guidelines (Reference ISUZU workshop manual):
- Ensure the engine is completely disassembled with the cylinder head removed.
- Clean the cylinder block sealing surface with appropriate solvent.
- Check the flatness of the block surface using a precision straightedge and feeler gauge.
- CRITICAL: Position the new cylinder head gasket correctly (refer to ISUZU workshop manual for orientation).
- Install the new cylinder head assembly onto the gasket.
- CRITICAL: Install new cylinder head bolts and torque in the correct sequence to the specified torque settings:
- Cold engine: 65-72 ft. lbs.
- Warm engine: 73-80 ft. lbs.
- Follow the angular tightening method specified in the ISUZU workshop manual.
- Reassemble remaining engine components.
- Refill with fresh coolant and engine oil.
- CRITICAL: Set valve clearance — cold: intake 0.15 mm, exhaust 0.25 mm.
- Start the engine and check for leaks.
- Perform a cooling system pressure test to verify seal integrity.
Maintenance Schedule:
- Inspection: During any cooling system service or if overheating symptoms appear.
- Replacement: Immediately if failure symptoms appear. Also recommended during major engine overhauls.
- Note: Early signs of cylinder head failure include engine overheating, white exhaust smoke, and coolant loss.
Packaging & Supply
- Packaging: Each cylinder head assembly is securely packed in a heavy-duty carton with foam inserts to prevent shipping damage.
- Sample Policy: Samples available (charged).
- Minimum Order Quantity: 1 piece.
- Delivery Time: 3-7 working days.
- Payment Terms: L/C, T/T, Western Union.
- Supply Ability: 1,000 sets per month.
- Suitable for: Wholesale distributors, engine rebuild shops, truck repair facilities, and fleet owners.
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