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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 specifiions 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.
If your cylinder head is failing, you may experience one or more of the following symptoms:
Engine Overheating: Temperature gauge consistently rising above normal — indies cracked head or failed gasket seal.
White Smoke from Exhaust: Steam-like white smoke indiing 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 Appliions:
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
Appliion
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 Specifiion — 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 specifiions.
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 specifiions.
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 appliions — verified by ISUZU N-Series durability standards.
Direct Bolt-On Fitment
No modifiions 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 & Verifiion
Our manufacturing and inspection processes ensure every cylinder head assembly meets or exceeds ISUZU OEM standards.
QC Item
Verifiion Method
Dimensional Accuracy
Precision inspection to verify 119mm head thickness, valve seat angles, and all mounting points match OE blueprint specifiions.
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 verifiion 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 specifiions, 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.
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
