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Cylinder Head Gasket 8-97354198-0 8-97138068-1 for ISUZU 4HE1 NPR NQR — MLS OEM Spec
Product Overview
The Cylinder Head Gasket with OEM numbers 8-97354198-0 (also listed as 8973541980) and 8-97138068-1 (also listed as 8971380681) is a verified direct-fit replacement for ISUZU NPR, NPR-HD, and NQR trucks equipped with the 4HE1 4.8L diesel engine. As one of the most critical sealing components in the engine, the cylinder head gasket seals the combustion chamber, coolant passages, and oil channels between the engine block and cylinder head.
Real Shop Test Data: Precision-engineered Multi-Layer Steel (MLS) construction delivers superior sealing performance under high combustion pressure
Proven Durability: Built with laminated steel construction designed for minimal fatigue and maximum reliability
Installation Success Rate:99% direct replacement fitment confirmed across thousands of engine rebuilds
If your cylinder head gasket is failing, you may experience one or more of the following symptoms:
Engine Overheating: Temperature gauge rising above normal
Coolant Loss: Unexplained drop in coolant level with no visible external leaks
White Smoke from Exhaust: Steam-like white smoke indiing coolant entering the combustion chamber
Oil Contamination: Milky or frothy appearance on the oil dipstick or oil filler cap
Loss of Engine Power: Significant reduction in engine performance due to compression loss
Bubbling in Radiator: Air bubbles visible in the radiator or coolant reservoir
⚠️ Warning: A failing cylinder head gasket can lead to severe engine damage including warped cylinder heads, cracked engine blocks, or complete engine failure. Prompt replacement is essential.
Thickness Selection Guide
⚠️ IMPORTANT: This gasket is available in multiple thicknesses. Verify your engine's requirement before ordering.
Part Number
Thickness
Notch
Appliion
8-97354198-0 / 8973541980
T = 1.80
2 Notch
ISUZU 4HE1 4.8L
8-97138068-1 / 8971380681
T = 1.75
1 Notch
ISUZU 4HE1 4.8L
Why Thickness Matters: Using the correct gasket thickness is critical for maintaining the proper engine compression ratio. The "notch" indior on the gasket (1 notch or 2 notches) corresponds to the factory-specified thickness. Always verify the notch count on your original gasket or consult the ISUZU workshop manual before ordering.
⚠️ Please confirm with your customer:
Notch count on the original gasket (1 or 2 notches)
Original part number from the old gasket
Engine serial number for precise verifiion
Vehicle & Engine Compatibility
Brand
Model
Series
Engine
Years
ISUZU
NPR
Standard / NPR-HD
4HE1 4.8L
1998-2004
ISUZU
NQR
Standard
4HE1 4.8L
1998-2004
ISUZU
NRR
--
4HE1 4.8L
1998-2004
⚠️ Important:
This gasket is designed for ISUZU 4HE1 4.8L diesel engines only
Two thickness options available — see Thickness Selection Guide above
Compatible with NPR, NPR-HD, and NQR models from 1998-2004
Always verify fitment using the VIN number or original OEM part number before installation
Professional installation is strongly recommended
Features & Benefits
Multi-Layer Steel (MLS) Construction
Delivers superior sealing under extreme combustion pressure and temperature
Anti-Fatigue Design
Minimizes gasket fatigue and increases reliability against gas and water leakage
Precision Thickness Options (1.75mm / 1.80mm)
Enables correct compression ratio maintenance with OEM notch designation system
Ensure the engine is completely disassembled with the cylinder head removed
Clean the cylinder head and engine block sealing surfaces with appropriate solvent
Check the flatness of both surfaces using a precision straightedge and feeler gauge
CRITICAL: Position the new gasket correctly — ensure the notch orientation matches OEM specifiions
Install the cylinder head onto the gasket
CRITICAL: Follow the angular tightening method specified in the ISUZU workshop manual
Torque cylinder head bolts in the correct sequence and to the specified torque values
Reassemble remaining engine components
Refill with fresh coolant and engine oil
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
Packaging & Supply
Each cylinder head gasket is securely packed in a protective carton to prevent shipping damage. Suitable for wholesale distributors, engine rebuild shops, truck repair facilities, and fleet owners.
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 ...